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From kisho...@apache.org
Subject svn commit: r1454247 [20/23] - in /incubator/helix/site-content: ./ apidocs/reference/ apidocs/reference/org/apache/helix/ apidocs/reference/org/apache/helix/messaging/handling/ apidocs/reference/org/apache/helix/tools/ apidocs/reference/org/apache/hel...
Date Fri, 08 Mar 2013 04:38:26 GMT
Modified: incubator/helix/site-content/xref/org/apache/helix/manager/zk/ZkBaseDataAccessor.html
URL: http://svn.apache.org/viewvc/incubator/helix/site-content/xref/org/apache/helix/manager/zk/ZkBaseDataAccessor.html?rev=1454247&r1=1454246&r2=1454247&view=diff
==============================================================================
--- incubator/helix/site-content/xref/org/apache/helix/manager/zk/ZkBaseDataAccessor.html (original)
+++ incubator/helix/site-content/xref/org/apache/helix/manager/zk/ZkBaseDataAccessor.html Fri Mar  8 04:38:16 2013
@@ -52,1242 +52,1243 @@
 <a class="jxr_linenumber" name="42" href="#42">42</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.manager.zk.ZkAsyncCallbacks.GetDataCallbackHandler;
 <a class="jxr_linenumber" name="43" href="#43">43</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.manager.zk.ZkAsyncCallbacks.SetDataCallbackHandler;
 <a class="jxr_linenumber" name="44" href="#44">44</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.store.zk.ZNode;
-<a class="jxr_linenumber" name="45" href="#45">45</a>  <strong class="jxr_keyword">import</strong> org.apache.log4j.Logger;
-<a class="jxr_linenumber" name="46" href="#46">46</a>  <strong class="jxr_keyword">import</strong> org.apache.zookeeper.CreateMode;
-<a class="jxr_linenumber" name="47" href="#47">47</a>  <strong class="jxr_keyword">import</strong> org.apache.zookeeper.KeeperException.Code;
-<a class="jxr_linenumber" name="48" href="#48">48</a>  <strong class="jxr_keyword">import</strong> org.apache.zookeeper.data.Stat;
-<a class="jxr_linenumber" name="49" href="#49">49</a>  <strong class="jxr_keyword">import</strong> org.apache.zookeeper.server.DataTree;
-<a class="jxr_linenumber" name="50" href="#50">50</a>  
+<a class="jxr_linenumber" name="45" href="#45">45</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.util.HelixUtil;
+<a class="jxr_linenumber" name="46" href="#46">46</a>  <strong class="jxr_keyword">import</strong> org.apache.log4j.Logger;
+<a class="jxr_linenumber" name="47" href="#47">47</a>  <strong class="jxr_keyword">import</strong> org.apache.zookeeper.CreateMode;
+<a class="jxr_linenumber" name="48" href="#48">48</a>  <strong class="jxr_keyword">import</strong> org.apache.zookeeper.KeeperException.Code;
+<a class="jxr_linenumber" name="49" href="#49">49</a>  <strong class="jxr_keyword">import</strong> org.apache.zookeeper.data.Stat;
+<a class="jxr_linenumber" name="50" href="#50">50</a>  <strong class="jxr_keyword">import</strong> org.apache.zookeeper.server.DataTree;
 <a class="jxr_linenumber" name="51" href="#51">51</a>  
-<a class="jxr_linenumber" name="52" href="#52">52</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> ZkBaseDataAccessor&lt;T&gt; <strong class="jxr_keyword">implements</strong> BaseDataAccessor&lt;T&gt;
-<a class="jxr_linenumber" name="53" href="#53">53</a>  {
-<a class="jxr_linenumber" name="54" href="#54">54</a>    enum <a href="../../../../../org/apache/helix/manager/zk/ZkBaseDataAccessor.html">RetCode</a>
-<a class="jxr_linenumber" name="55" href="#55">55</a>    {
-<a class="jxr_linenumber" name="56" href="#56">56</a>      OK, NODE_EXISTS, ERROR
-<a class="jxr_linenumber" name="57" href="#57">57</a>    }
-<a class="jxr_linenumber" name="58" href="#58">58</a>  
-<a class="jxr_linenumber" name="59" href="#59">59</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> Logger  LOG = Logger.getLogger(ZkBaseDataAccessor.<strong class="jxr_keyword">class</strong>);
-<a class="jxr_linenumber" name="60" href="#60">60</a>  
-<a class="jxr_linenumber" name="61" href="#61">61</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/helix/manager/zk/ZkClient.html">ZkClient</a> _zkClient;
-<a class="jxr_linenumber" name="62" href="#62">62</a>  
-<a class="jxr_linenumber" name="63" href="#63">63</a>    <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/helix/manager/zk/ZkBaseDataAccessor.html">ZkBaseDataAccessor</a>(<a href="../../../../../org/apache/helix/manager/zk/ZkClient.html">ZkClient</a> zkClient)
-<a class="jxr_linenumber" name="64" href="#64">64</a>    {
-<a class="jxr_linenumber" name="65" href="#65">65</a>      _zkClient = zkClient;
-<a class="jxr_linenumber" name="66" href="#66">66</a>    }
-<a class="jxr_linenumber" name="67" href="#67">67</a>  
-<a class="jxr_linenumber" name="68" href="#68">68</a>    <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="69" href="#69">69</a>  <em class="jxr_javadoccomment">   * sync create</em>
-<a class="jxr_linenumber" name="70" href="#70">70</a>  <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="71" href="#71">71</a>    @Override
-<a class="jxr_linenumber" name="72" href="#72">72</a>    <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> create(String path, T record, <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="73" href="#73">73</a>    {
-<a class="jxr_linenumber" name="74" href="#74">74</a>      <strong class="jxr_keyword">return</strong> create(path, record, <strong class="jxr_keyword">null</strong>, options) == RetCode.OK;
-<a class="jxr_linenumber" name="75" href="#75">75</a>    }
-<a class="jxr_linenumber" name="76" href="#76">76</a>  
-<a class="jxr_linenumber" name="77" href="#77">77</a>    <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="78" href="#78">78</a>  <em class="jxr_javadoccomment">   * sync create</em>
-<a class="jxr_linenumber" name="79" href="#79">79</a>  <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="80" href="#80">80</a>    <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/helix/manager/zk/ZkBaseDataAccessor.html">RetCode</a> create(String path, T record, List&lt;String&gt; pathCreated, <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="81" href="#81">81</a>    {
-<a class="jxr_linenumber" name="82" href="#82">82</a>      CreateMode mode = AccessOption.getMode(options);
-<a class="jxr_linenumber" name="83" href="#83">83</a>      <strong class="jxr_keyword">if</strong> (mode == <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="84" href="#84">84</a>      {
-<a class="jxr_linenumber" name="85" href="#85">85</a>        LOG.error(<span class="jxr_string">"Invalid create mode. options: "</span> + options);
-<a class="jxr_linenumber" name="86" href="#86">86</a>        <strong class="jxr_keyword">return</strong> RetCode.ERROR;
-<a class="jxr_linenumber" name="87" href="#87">87</a>      }
-<a class="jxr_linenumber" name="88" href="#88">88</a>  
-<a class="jxr_linenumber" name="89" href="#89">89</a>      <strong class="jxr_keyword">boolean</strong> retry;
-<a class="jxr_linenumber" name="90" href="#90">90</a>      <strong class="jxr_keyword">do</strong>
-<a class="jxr_linenumber" name="91" href="#91">91</a>      {
-<a class="jxr_linenumber" name="92" href="#92">92</a>        retry = false;
-<a class="jxr_linenumber" name="93" href="#93">93</a>        <strong class="jxr_keyword">try</strong>
-<a class="jxr_linenumber" name="94" href="#94">94</a>        {
-<a class="jxr_linenumber" name="95" href="#95">95</a>          _zkClient.create(path, record, mode);
-<a class="jxr_linenumber" name="96" href="#96">96</a>          <strong class="jxr_keyword">if</strong> (pathCreated != <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="97" href="#97">97</a>            pathCreated.add(path);
-<a class="jxr_linenumber" name="98" href="#98">98</a>  
-<a class="jxr_linenumber" name="99" href="#99">99</a>          <strong class="jxr_keyword">return</strong> RetCode.OK;
-<a class="jxr_linenumber" name="100" href="#100">100</a>       }
-<a class="jxr_linenumber" name="101" href="#101">101</a>       <strong class="jxr_keyword">catch</strong> (ZkNoNodeException e)
-<a class="jxr_linenumber" name="102" href="#102">102</a>       {
-<a class="jxr_linenumber" name="103" href="#103">103</a>         <em class="jxr_comment">// this will happen if parent node does not exist</em>
-<a class="jxr_linenumber" name="104" href="#104">104</a>         String parentPath = <strong class="jxr_keyword">new</strong> File(path).getParent();
-<a class="jxr_linenumber" name="105" href="#105">105</a>         <strong class="jxr_keyword">try</strong>
-<a class="jxr_linenumber" name="106" href="#106">106</a>         {
-<a class="jxr_linenumber" name="107" href="#107">107</a>           <a href="../../../../../org/apache/helix/manager/zk/ZkBaseDataAccessor.html">RetCode</a> rc = create(parentPath, <strong class="jxr_keyword">null</strong>, pathCreated, AccessOption.PERSISTENT);
-<a class="jxr_linenumber" name="108" href="#108">108</a>           <strong class="jxr_keyword">if</strong> (rc == RetCode.OK || rc == RetCode.NODE_EXISTS)
-<a class="jxr_linenumber" name="109" href="#109">109</a>           {
-<a class="jxr_linenumber" name="110" href="#110">110</a>             <em class="jxr_comment">// if parent node created/exists, retry</em>
-<a class="jxr_linenumber" name="111" href="#111">111</a>             retry = <strong class="jxr_keyword">true</strong>;
-<a class="jxr_linenumber" name="112" href="#112">112</a>           }
-<a class="jxr_linenumber" name="113" href="#113">113</a>         }
-<a class="jxr_linenumber" name="114" href="#114">114</a>         <strong class="jxr_keyword">catch</strong> (Exception e1)
-<a class="jxr_linenumber" name="115" href="#115">115</a>         {
-<a class="jxr_linenumber" name="116" href="#116">116</a>           LOG.error(<span class="jxr_string">"Exception while creating path: "</span> + parentPath, e1);
-<a class="jxr_linenumber" name="117" href="#117">117</a>           <strong class="jxr_keyword">return</strong> RetCode.ERROR;
-<a class="jxr_linenumber" name="118" href="#118">118</a>         }
-<a class="jxr_linenumber" name="119" href="#119">119</a>       }
-<a class="jxr_linenumber" name="120" href="#120">120</a>       <strong class="jxr_keyword">catch</strong> (ZkNodeExistsException e)
-<a class="jxr_linenumber" name="121" href="#121">121</a>       {
-<a class="jxr_linenumber" name="122" href="#122">122</a>         LOG.warn(<span class="jxr_string">"Node already exists. path: "</span> + path);
-<a class="jxr_linenumber" name="123" href="#123">123</a>         <strong class="jxr_keyword">return</strong> RetCode.NODE_EXISTS;
-<a class="jxr_linenumber" name="124" href="#124">124</a>       }
-<a class="jxr_linenumber" name="125" href="#125">125</a>       <strong class="jxr_keyword">catch</strong> (Exception e)
-<a class="jxr_linenumber" name="126" href="#126">126</a>       {
-<a class="jxr_linenumber" name="127" href="#127">127</a>         LOG.error(<span class="jxr_string">"Exception while creating path: "</span> + path, e);
-<a class="jxr_linenumber" name="128" href="#128">128</a>         <strong class="jxr_keyword">return</strong> RetCode.ERROR;
-<a class="jxr_linenumber" name="129" href="#129">129</a>       }
-<a class="jxr_linenumber" name="130" href="#130">130</a>     }
-<a class="jxr_linenumber" name="131" href="#131">131</a>     <strong class="jxr_keyword">while</strong> (retry);
-<a class="jxr_linenumber" name="132" href="#132">132</a> 
-<a class="jxr_linenumber" name="133" href="#133">133</a>     <strong class="jxr_keyword">return</strong> RetCode.OK;
-<a class="jxr_linenumber" name="134" href="#134">134</a>   }
-<a class="jxr_linenumber" name="135" href="#135">135</a> 
-<a class="jxr_linenumber" name="136" href="#136">136</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="137" href="#137">137</a> <em class="jxr_javadoccomment">   * sync set</em>
-<a class="jxr_linenumber" name="138" href="#138">138</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="139" href="#139">139</a>   @Override
-<a class="jxr_linenumber" name="140" href="#140">140</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> set(String path, T record, <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="141" href="#141">141</a>   {
-<a class="jxr_linenumber" name="142" href="#142">142</a>     <strong class="jxr_keyword">return</strong> set(path, record, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, -1, options);
-<a class="jxr_linenumber" name="143" href="#143">143</a>   }
-<a class="jxr_linenumber" name="144" href="#144">144</a> 
-<a class="jxr_linenumber" name="145" href="#145">145</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="146" href="#146">146</a> <em class="jxr_javadoccomment">   * sync set</em>
-<a class="jxr_linenumber" name="147" href="#147">147</a> <em class="jxr_javadoccomment">   * </em>
-<a class="jxr_linenumber" name="148" href="#148">148</a> <em class="jxr_javadoccomment">   * @param setstat</em>
-<a class="jxr_linenumber" name="149" href="#149">149</a> <em class="jxr_javadoccomment">   *          : if node is created instead of set, stat will NOT be set</em>
-<a class="jxr_linenumber" name="150" href="#150">150</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="151" href="#151">151</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> set(String path,
-<a class="jxr_linenumber" name="152" href="#152">152</a>                      T record,
-<a class="jxr_linenumber" name="153" href="#153">153</a>                      List&lt;String&gt; pathsCreated,
-<a class="jxr_linenumber" name="154" href="#154">154</a>                      Stat setstat,
-<a class="jxr_linenumber" name="155" href="#155">155</a>                      <strong class="jxr_keyword">int</strong> expectVersion,
-<a class="jxr_linenumber" name="156" href="#156">156</a>                      <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="157" href="#157">157</a>   {
-<a class="jxr_linenumber" name="158" href="#158">158</a>     CreateMode mode = AccessOption.getMode(options);
-<a class="jxr_linenumber" name="159" href="#159">159</a>     <strong class="jxr_keyword">if</strong> (mode == <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="160" href="#160">160</a>     {
-<a class="jxr_linenumber" name="161" href="#161">161</a>       LOG.error(<span class="jxr_string">"Invalid set mode. options: "</span> + options);
-<a class="jxr_linenumber" name="162" href="#162">162</a>       <strong class="jxr_keyword">return</strong> false;
-<a class="jxr_linenumber" name="163" href="#163">163</a>     }
-<a class="jxr_linenumber" name="164" href="#164">164</a> 
-<a class="jxr_linenumber" name="165" href="#165">165</a>     <strong class="jxr_keyword">boolean</strong> retry;
-<a class="jxr_linenumber" name="166" href="#166">166</a>     <strong class="jxr_keyword">do</strong>
-<a class="jxr_linenumber" name="167" href="#167">167</a>     {
-<a class="jxr_linenumber" name="168" href="#168">168</a>       retry = false;
-<a class="jxr_linenumber" name="169" href="#169">169</a>       <strong class="jxr_keyword">try</strong>
-<a class="jxr_linenumber" name="170" href="#170">170</a>       {
-<a class="jxr_linenumber" name="171" href="#171">171</a>         <em class="jxr_comment">// _zkClient.writeData(path, record);</em>
-<a class="jxr_linenumber" name="172" href="#172">172</a>         Stat setStat = _zkClient.writeDataGetStat(path, record, expectVersion);
-<a class="jxr_linenumber" name="173" href="#173">173</a>         <strong class="jxr_keyword">if</strong> (setstat != <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="174" href="#174">174</a>           DataTree.copyStat(setStat, setstat);
-<a class="jxr_linenumber" name="175" href="#175">175</a>       }
-<a class="jxr_linenumber" name="176" href="#176">176</a>       <strong class="jxr_keyword">catch</strong> (ZkNoNodeException e)
-<a class="jxr_linenumber" name="177" href="#177">177</a>       {
-<a class="jxr_linenumber" name="178" href="#178">178</a>         <em class="jxr_comment">// node not exists, try create. in this case, stat will not be set</em>
-<a class="jxr_linenumber" name="179" href="#179">179</a>         <strong class="jxr_keyword">try</strong>
-<a class="jxr_linenumber" name="180" href="#180">180</a>         {
-<a class="jxr_linenumber" name="181" href="#181">181</a>           <a href="../../../../../org/apache/helix/manager/zk/ZkBaseDataAccessor.html">RetCode</a> rc = create(path, record, pathsCreated, options);
-<a class="jxr_linenumber" name="182" href="#182">182</a>           <em class="jxr_comment">// if (rc == RetCode.OK || rc == RetCode.NODE_EXISTS)</em>
-<a class="jxr_linenumber" name="183" href="#183">183</a>           <em class="jxr_comment">// retry = true;</em>
-<a class="jxr_linenumber" name="184" href="#184">184</a>           <strong class="jxr_keyword">switch</strong> (rc)
-<a class="jxr_linenumber" name="185" href="#185">185</a>           {
-<a class="jxr_linenumber" name="186" href="#186">186</a>           <strong class="jxr_keyword">case</strong> OK:
-<a class="jxr_linenumber" name="187" href="#187">187</a>             <em class="jxr_comment">// not set stat if node is created (instead of set)</em>
-<a class="jxr_linenumber" name="188" href="#188">188</a>             <strong class="jxr_keyword">break</strong>;
-<a class="jxr_linenumber" name="189" href="#189">189</a>           <strong class="jxr_keyword">case</strong> NODE_EXISTS:
-<a class="jxr_linenumber" name="190" href="#190">190</a>             retry = <strong class="jxr_keyword">true</strong>;
-<a class="jxr_linenumber" name="191" href="#191">191</a>             <strong class="jxr_keyword">break</strong>;
-<a class="jxr_linenumber" name="192" href="#192">192</a>           <strong class="jxr_keyword">default</strong>:
-<a class="jxr_linenumber" name="193" href="#193">193</a>             LOG.error(<span class="jxr_string">"Fail to set path by creating: "</span> + path);
-<a class="jxr_linenumber" name="194" href="#194">194</a>             <strong class="jxr_keyword">return</strong> false;
-<a class="jxr_linenumber" name="195" href="#195">195</a>           }
-<a class="jxr_linenumber" name="196" href="#196">196</a>         }
-<a class="jxr_linenumber" name="197" href="#197">197</a>         <strong class="jxr_keyword">catch</strong> (Exception e1)
-<a class="jxr_linenumber" name="198" href="#198">198</a>         {
-<a class="jxr_linenumber" name="199" href="#199">199</a>           LOG.error(<span class="jxr_string">"Exception while setting path by creating: "</span> + path, e);
-<a class="jxr_linenumber" name="200" href="#200">200</a>           <strong class="jxr_keyword">return</strong> false;
-<a class="jxr_linenumber" name="201" href="#201">201</a>         }
-<a class="jxr_linenumber" name="202" href="#202">202</a>       }
-<a class="jxr_linenumber" name="203" href="#203">203</a>       <strong class="jxr_keyword">catch</strong> (ZkBadVersionException e)
-<a class="jxr_linenumber" name="204" href="#204">204</a>       {
-<a class="jxr_linenumber" name="205" href="#205">205</a>         <strong class="jxr_keyword">throw</strong> e;
-<a class="jxr_linenumber" name="206" href="#206">206</a>       }
-<a class="jxr_linenumber" name="207" href="#207">207</a>       <strong class="jxr_keyword">catch</strong> (Exception e)
-<a class="jxr_linenumber" name="208" href="#208">208</a>       {
-<a class="jxr_linenumber" name="209" href="#209">209</a>         LOG.error(<span class="jxr_string">"Exception while setting path: "</span> + path, e);
-<a class="jxr_linenumber" name="210" href="#210">210</a>         <strong class="jxr_keyword">return</strong> false;
-<a class="jxr_linenumber" name="211" href="#211">211</a>       }
-<a class="jxr_linenumber" name="212" href="#212">212</a>     }
-<a class="jxr_linenumber" name="213" href="#213">213</a>     <strong class="jxr_keyword">while</strong> (retry);
-<a class="jxr_linenumber" name="214" href="#214">214</a> 
-<a class="jxr_linenumber" name="215" href="#215">215</a>     <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
-<a class="jxr_linenumber" name="216" href="#216">216</a>   }
-<a class="jxr_linenumber" name="217" href="#217">217</a> 
-<a class="jxr_linenumber" name="218" href="#218">218</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="219" href="#219">219</a> <em class="jxr_javadoccomment">   * sync update</em>
-<a class="jxr_linenumber" name="220" href="#220">220</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="221" href="#221">221</a>   @Override
-<a class="jxr_linenumber" name="222" href="#222">222</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> update(String path, DataUpdater&lt;T&gt; updater, <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="223" href="#223">223</a>   {
-<a class="jxr_linenumber" name="224" href="#224">224</a>     <strong class="jxr_keyword">return</strong> update(path, updater, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, options) != <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="225" href="#225">225</a>   }
-<a class="jxr_linenumber" name="226" href="#226">226</a> 
-<a class="jxr_linenumber" name="227" href="#227">227</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="228" href="#228">228</a> <em class="jxr_javadoccomment">   * sync update</em>
-<a class="jxr_linenumber" name="229" href="#229">229</a> <em class="jxr_javadoccomment">   * </em>
-<a class="jxr_linenumber" name="230" href="#230">230</a> <em class="jxr_javadoccomment">   * @return: updatedData on success, or null on fail</em>
-<a class="jxr_linenumber" name="231" href="#231">231</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="232" href="#232">232</a>   <strong class="jxr_keyword">public</strong> T update(String path,
-<a class="jxr_linenumber" name="233" href="#233">233</a>                   DataUpdater&lt;T&gt; updater,
-<a class="jxr_linenumber" name="234" href="#234">234</a>                   List&lt;String&gt; createPaths,
-<a class="jxr_linenumber" name="235" href="#235">235</a>                   Stat stat,
-<a class="jxr_linenumber" name="236" href="#236">236</a>                   <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="237" href="#237">237</a>   {
-<a class="jxr_linenumber" name="238" href="#238">238</a>     CreateMode mode = AccessOption.getMode(options);
-<a class="jxr_linenumber" name="239" href="#239">239</a>     <strong class="jxr_keyword">if</strong> (mode == <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="240" href="#240">240</a>     {
-<a class="jxr_linenumber" name="241" href="#241">241</a>       LOG.error(<span class="jxr_string">"Invalid update mode. options: "</span> + options);
-<a class="jxr_linenumber" name="242" href="#242">242</a>       <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="243" href="#243">243</a>     }
-<a class="jxr_linenumber" name="244" href="#244">244</a> 
-<a class="jxr_linenumber" name="245" href="#245">245</a>     <strong class="jxr_keyword">boolean</strong> retry;
-<a class="jxr_linenumber" name="246" href="#246">246</a>     T updatedData = <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="247" href="#247">247</a>     <strong class="jxr_keyword">do</strong>
-<a class="jxr_linenumber" name="248" href="#248">248</a>     {
-<a class="jxr_linenumber" name="249" href="#249">249</a>       retry = false;
-<a class="jxr_linenumber" name="250" href="#250">250</a>       <strong class="jxr_keyword">try</strong>
-<a class="jxr_linenumber" name="251" href="#251">251</a>       {
-<a class="jxr_linenumber" name="252" href="#252">252</a>         Stat readStat = <strong class="jxr_keyword">new</strong> Stat();
-<a class="jxr_linenumber" name="253" href="#253">253</a>         T oldData = (T) _zkClient.readData(path, readStat);
-<a class="jxr_linenumber" name="254" href="#254">254</a>         T newData = updater.update(oldData);
-<a class="jxr_linenumber" name="255" href="#255">255</a>         Stat setStat = _zkClient.writeDataGetStat(path, newData, readStat.getVersion());
-<a class="jxr_linenumber" name="256" href="#256">256</a>         <strong class="jxr_keyword">if</strong> (stat != <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="257" href="#257">257</a>         {
-<a class="jxr_linenumber" name="258" href="#258">258</a>           DataTree.copyStat(setStat, stat);
-<a class="jxr_linenumber" name="259" href="#259">259</a>         }
-<a class="jxr_linenumber" name="260" href="#260">260</a> 
-<a class="jxr_linenumber" name="261" href="#261">261</a>         updatedData = newData;
-<a class="jxr_linenumber" name="262" href="#262">262</a>       }
-<a class="jxr_linenumber" name="263" href="#263">263</a>       <strong class="jxr_keyword">catch</strong> (ZkBadVersionException e)
-<a class="jxr_linenumber" name="264" href="#264">264</a>       {
-<a class="jxr_linenumber" name="265" href="#265">265</a>         retry = <strong class="jxr_keyword">true</strong>;
-<a class="jxr_linenumber" name="266" href="#266">266</a>       }
-<a class="jxr_linenumber" name="267" href="#267">267</a>       <strong class="jxr_keyword">catch</strong> (ZkNoNodeException e)
-<a class="jxr_linenumber" name="268" href="#268">268</a>       {
-<a class="jxr_linenumber" name="269" href="#269">269</a>         <em class="jxr_comment">// node not exist, try create</em>
-<a class="jxr_linenumber" name="270" href="#270">270</a>         <strong class="jxr_keyword">try</strong>
-<a class="jxr_linenumber" name="271" href="#271">271</a>         {
-<a class="jxr_linenumber" name="272" href="#272">272</a>           T newData = updater.update(<strong class="jxr_keyword">null</strong>);
-<a class="jxr_linenumber" name="273" href="#273">273</a>           <a href="../../../../../org/apache/helix/manager/zk/ZkBaseDataAccessor.html">RetCode</a> rc = create(path, newData, createPaths, options);
-<a class="jxr_linenumber" name="274" href="#274">274</a>           <strong class="jxr_keyword">switch</strong> (rc)
-<a class="jxr_linenumber" name="275" href="#275">275</a>           {
-<a class="jxr_linenumber" name="276" href="#276">276</a>           <strong class="jxr_keyword">case</strong> OK:
-<a class="jxr_linenumber" name="277" href="#277">277</a>             updatedData = newData;
-<a class="jxr_linenumber" name="278" href="#278">278</a>             <strong class="jxr_keyword">break</strong>;
-<a class="jxr_linenumber" name="279" href="#279">279</a>           <strong class="jxr_keyword">case</strong> NODE_EXISTS:
-<a class="jxr_linenumber" name="280" href="#280">280</a>             retry = <strong class="jxr_keyword">true</strong>;
-<a class="jxr_linenumber" name="281" href="#281">281</a>             <strong class="jxr_keyword">break</strong>;
-<a class="jxr_linenumber" name="282" href="#282">282</a>           <strong class="jxr_keyword">default</strong>:
-<a class="jxr_linenumber" name="283" href="#283">283</a>             LOG.error(<span class="jxr_string">"Fail to update path by creating: "</span> + path);
-<a class="jxr_linenumber" name="284" href="#284">284</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="285" href="#285">285</a>           }
-<a class="jxr_linenumber" name="286" href="#286">286</a>         }
-<a class="jxr_linenumber" name="287" href="#287">287</a>         <strong class="jxr_keyword">catch</strong> (Exception e1)
-<a class="jxr_linenumber" name="288" href="#288">288</a>         {
-<a class="jxr_linenumber" name="289" href="#289">289</a>           LOG.error(<span class="jxr_string">"Exception while updating path by creating: "</span> + path, e1);
-<a class="jxr_linenumber" name="290" href="#290">290</a>           <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="291" href="#291">291</a>         }
-<a class="jxr_linenumber" name="292" href="#292">292</a>       }
-<a class="jxr_linenumber" name="293" href="#293">293</a>       <strong class="jxr_keyword">catch</strong> (Exception e)
-<a class="jxr_linenumber" name="294" href="#294">294</a>       {
-<a class="jxr_linenumber" name="295" href="#295">295</a>         LOG.error(<span class="jxr_string">"Exception while updating path: "</span> + path, e);
-<a class="jxr_linenumber" name="296" href="#296">296</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="297" href="#297">297</a>       }
-<a class="jxr_linenumber" name="298" href="#298">298</a>     }
-<a class="jxr_linenumber" name="299" href="#299">299</a>     <strong class="jxr_keyword">while</strong> (retry);
-<a class="jxr_linenumber" name="300" href="#300">300</a> 
-<a class="jxr_linenumber" name="301" href="#301">301</a>     <strong class="jxr_keyword">return</strong> updatedData;
-<a class="jxr_linenumber" name="302" href="#302">302</a>   }
-<a class="jxr_linenumber" name="303" href="#303">303</a> 
-<a class="jxr_linenumber" name="304" href="#304">304</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="305" href="#305">305</a> <em class="jxr_javadoccomment">   * sync get</em>
-<a class="jxr_linenumber" name="306" href="#306">306</a> <em class="jxr_javadoccomment">   * </em>
-<a class="jxr_linenumber" name="307" href="#307">307</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="308" href="#308">308</a>   @Override
-<a class="jxr_linenumber" name="309" href="#309">309</a>   <strong class="jxr_keyword">public</strong> T get(String path, Stat stat, <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="310" href="#310">310</a>   {
-<a class="jxr_linenumber" name="311" href="#311">311</a>     T data = <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="312" href="#312">312</a>     <strong class="jxr_keyword">try</strong>
-<a class="jxr_linenumber" name="313" href="#313">313</a>     {
-<a class="jxr_linenumber" name="314" href="#314">314</a>       data = (T) _zkClient.readData(path, stat);
-<a class="jxr_linenumber" name="315" href="#315">315</a>     }
-<a class="jxr_linenumber" name="316" href="#316">316</a>     <strong class="jxr_keyword">catch</strong> (ZkNoNodeException e)
-<a class="jxr_linenumber" name="317" href="#317">317</a>     {
-<a class="jxr_linenumber" name="318" href="#318">318</a>       <strong class="jxr_keyword">if</strong> (AccessOption.isThrowExceptionIfNotExist(options))
-<a class="jxr_linenumber" name="319" href="#319">319</a>       {
-<a class="jxr_linenumber" name="320" href="#320">320</a>         <strong class="jxr_keyword">throw</strong> e;
-<a class="jxr_linenumber" name="321" href="#321">321</a>       }
-<a class="jxr_linenumber" name="322" href="#322">322</a>     }
-<a class="jxr_linenumber" name="323" href="#323">323</a>     <strong class="jxr_keyword">return</strong> data;
-<a class="jxr_linenumber" name="324" href="#324">324</a>   }
-<a class="jxr_linenumber" name="325" href="#325">325</a> 
-<a class="jxr_linenumber" name="326" href="#326">326</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="327" href="#327">327</a> <em class="jxr_javadoccomment">   * async get</em>
-<a class="jxr_linenumber" name="328" href="#328">328</a> <em class="jxr_javadoccomment">   * </em>
-<a class="jxr_linenumber" name="329" href="#329">329</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="330" href="#330">330</a>   @Override
-<a class="jxr_linenumber" name="331" href="#331">331</a>   <strong class="jxr_keyword">public</strong> List&lt;T&gt; get(List&lt;String&gt; paths, List&lt;Stat&gt; stats, <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="332" href="#332">332</a>   {
-<a class="jxr_linenumber" name="333" href="#333">333</a>     <strong class="jxr_keyword">boolean</strong>[] needRead = <strong class="jxr_keyword">new</strong> <strong class="jxr_keyword">boolean</strong>[paths.size()];
-<a class="jxr_linenumber" name="334" href="#334">334</a>     Arrays.fill(needRead, <strong class="jxr_keyword">true</strong>);
-<a class="jxr_linenumber" name="335" href="#335">335</a> 
-<a class="jxr_linenumber" name="336" href="#336">336</a>     <strong class="jxr_keyword">return</strong> get(paths, stats, needRead);
-<a class="jxr_linenumber" name="337" href="#337">337</a>   }
-<a class="jxr_linenumber" name="338" href="#338">338</a> 
-<a class="jxr_linenumber" name="339" href="#339">339</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="340" href="#340">340</a> <em class="jxr_javadoccomment">   * async get</em>
-<a class="jxr_linenumber" name="341" href="#341">341</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="342" href="#342">342</a>   List&lt;T&gt; get(List&lt;String&gt; paths, List&lt;Stat&gt; stats, <strong class="jxr_keyword">boolean</strong>[] needRead)
-<a class="jxr_linenumber" name="343" href="#343">343</a>   {
-<a class="jxr_linenumber" name="344" href="#344">344</a>     <strong class="jxr_keyword">if</strong> (paths == <strong class="jxr_keyword">null</strong> || paths.size() == 0)
-<a class="jxr_linenumber" name="345" href="#345">345</a>     {
-<a class="jxr_linenumber" name="346" href="#346">346</a>       <strong class="jxr_keyword">return</strong> Collections.emptyList();
-<a class="jxr_linenumber" name="347" href="#347">347</a>     }
-<a class="jxr_linenumber" name="348" href="#348">348</a> 
-<a class="jxr_linenumber" name="349" href="#349">349</a>     <em class="jxr_comment">// init stats</em>
-<a class="jxr_linenumber" name="350" href="#350">350</a>     <strong class="jxr_keyword">if</strong> (stats != <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="351" href="#351">351</a>     {
-<a class="jxr_linenumber" name="352" href="#352">352</a>       stats.clear();
-<a class="jxr_linenumber" name="353" href="#353">353</a>       stats.addAll(Collections.&lt;Stat&gt; nCopies(paths.size(), <strong class="jxr_keyword">null</strong>));
-<a class="jxr_linenumber" name="354" href="#354">354</a>     }
-<a class="jxr_linenumber" name="355" href="#355">355</a> 
-<a class="jxr_linenumber" name="356" href="#356">356</a>     <strong class="jxr_keyword">long</strong> startT = System.nanoTime();
-<a class="jxr_linenumber" name="357" href="#357">357</a> 
-<a class="jxr_linenumber" name="358" href="#358">358</a>     <strong class="jxr_keyword">try</strong>
-<a class="jxr_linenumber" name="359" href="#359">359</a>     {
-<a class="jxr_linenumber" name="360" href="#360">360</a>       <em class="jxr_comment">// issue asyn get requests</em>
-<a class="jxr_linenumber" name="361" href="#361">361</a>       <a href="../../../../../org/apache/helix/manager/zk/ZkAsyncCallbacks.html">GetDataCallbackHandler</a>[] cbList = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/manager/zk/ZkAsyncCallbacks.html">GetDataCallbackHandler</a>[paths.size()];
-<a class="jxr_linenumber" name="362" href="#362">362</a>       <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; paths.size(); i++)
-<a class="jxr_linenumber" name="363" href="#363">363</a>       {
-<a class="jxr_linenumber" name="364" href="#364">364</a>         <strong class="jxr_keyword">if</strong> (!needRead[i])
-<a class="jxr_linenumber" name="365" href="#365">365</a>           <strong class="jxr_keyword">continue</strong>;
-<a class="jxr_linenumber" name="366" href="#366">366</a> 
-<a class="jxr_linenumber" name="367" href="#367">367</a>         String path = paths.get(i);
-<a class="jxr_linenumber" name="368" href="#368">368</a>         cbList[i] = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/manager/zk/ZkAsyncCallbacks.html">GetDataCallbackHandler</a>();
-<a class="jxr_linenumber" name="369" href="#369">369</a>         _zkClient.asyncGetData(path, cbList[i]);
-<a class="jxr_linenumber" name="370" href="#370">370</a>       }
-<a class="jxr_linenumber" name="371" href="#371">371</a> 
-<a class="jxr_linenumber" name="372" href="#372">372</a>       <em class="jxr_comment">// wait for completion</em>
-<a class="jxr_linenumber" name="373" href="#373">373</a>       <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; cbList.length; i++)
-<a class="jxr_linenumber" name="374" href="#374">374</a>       {
-<a class="jxr_linenumber" name="375" href="#375">375</a>         <strong class="jxr_keyword">if</strong> (!needRead[i])
-<a class="jxr_linenumber" name="376" href="#376">376</a>           <strong class="jxr_keyword">continue</strong>;
-<a class="jxr_linenumber" name="377" href="#377">377</a> 
-<a class="jxr_linenumber" name="378" href="#378">378</a>         <a href="../../../../../org/apache/helix/manager/zk/ZkAsyncCallbacks.html">GetDataCallbackHandler</a> cb = cbList[i];
-<a class="jxr_linenumber" name="379" href="#379">379</a>         cb.waitForSuccess();
-<a class="jxr_linenumber" name="380" href="#380">380</a>       }
-<a class="jxr_linenumber" name="381" href="#381">381</a> 
-<a class="jxr_linenumber" name="382" href="#382">382</a>       <em class="jxr_comment">// construct return results</em>
-<a class="jxr_linenumber" name="383" href="#383">383</a>       List&lt;T&gt; records = <strong class="jxr_keyword">new</strong> ArrayList&lt;T&gt;(Collections.&lt;T&gt; nCopies(paths.size(), <strong class="jxr_keyword">null</strong>));
-<a class="jxr_linenumber" name="384" href="#384">384</a> 
-<a class="jxr_linenumber" name="385" href="#385">385</a>       <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; paths.size(); i++)
-<a class="jxr_linenumber" name="386" href="#386">386</a>       {
-<a class="jxr_linenumber" name="387" href="#387">387</a>         <strong class="jxr_keyword">if</strong> (!needRead[i])
-<a class="jxr_linenumber" name="388" href="#388">388</a>           <strong class="jxr_keyword">continue</strong>;
-<a class="jxr_linenumber" name="389" href="#389">389</a> 
-<a class="jxr_linenumber" name="390" href="#390">390</a>         <a href="../../../../../org/apache/helix/manager/zk/ZkAsyncCallbacks.html">GetDataCallbackHandler</a> cb = cbList[i];
-<a class="jxr_linenumber" name="391" href="#391">391</a>         <strong class="jxr_keyword">if</strong> (Code.get(cb.getRc()) == Code.OK)
-<a class="jxr_linenumber" name="392" href="#392">392</a>         {
-<a class="jxr_linenumber" name="393" href="#393">393</a>           @SuppressWarnings(<span class="jxr_string">"unchecked"</span>)
-<a class="jxr_linenumber" name="394" href="#394">394</a>           T record = (T) _zkClient.deserialize(cb._data, paths.get(i));
-<a class="jxr_linenumber" name="395" href="#395">395</a>           records.set(i, record);
-<a class="jxr_linenumber" name="396" href="#396">396</a>           <strong class="jxr_keyword">if</strong> (stats != <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="397" href="#397">397</a>           {
-<a class="jxr_linenumber" name="398" href="#398">398</a>             stats.set(i, cb._stat);
-<a class="jxr_linenumber" name="399" href="#399">399</a>           }
-<a class="jxr_linenumber" name="400" href="#400">400</a>         }
-<a class="jxr_linenumber" name="401" href="#401">401</a>       }
-<a class="jxr_linenumber" name="402" href="#402">402</a> 
-<a class="jxr_linenumber" name="403" href="#403">403</a>       <strong class="jxr_keyword">return</strong> records;
-<a class="jxr_linenumber" name="404" href="#404">404</a>     }
-<a class="jxr_linenumber" name="405" href="#405">405</a>     <strong class="jxr_keyword">finally</strong>
-<a class="jxr_linenumber" name="406" href="#406">406</a>     {
-<a class="jxr_linenumber" name="407" href="#407">407</a>       <strong class="jxr_keyword">long</strong> endT = System.nanoTime();
-<a class="jxr_linenumber" name="408" href="#408">408</a>       <strong class="jxr_keyword">if</strong> (LOG.isTraceEnabled())
-<a class="jxr_linenumber" name="409" href="#409">409</a>       {
-<a class="jxr_linenumber" name="410" href="#410">410</a>         LOG.trace(<span class="jxr_string">"getData_async, size: "</span> + paths.size() + <span class="jxr_string">", paths: "</span> + paths.get(0)
-<a class="jxr_linenumber" name="411" href="#411">411</a>           + <span class="jxr_string">",... time: "</span> + (endT - startT) + <span class="jxr_string">" ns"</span>);
-<a class="jxr_linenumber" name="412" href="#412">412</a>       }
-<a class="jxr_linenumber" name="413" href="#413">413</a>     }
-<a class="jxr_linenumber" name="414" href="#414">414</a>   }
-<a class="jxr_linenumber" name="415" href="#415">415</a> 
-<a class="jxr_linenumber" name="416" href="#416">416</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="417" href="#417">417</a> <em class="jxr_javadoccomment">   * asyn getChildren</em>
-<a class="jxr_linenumber" name="418" href="#418">418</a> <em class="jxr_javadoccomment">   * </em>
-<a class="jxr_linenumber" name="419" href="#419">419</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="420" href="#420">420</a>   @Override
-<a class="jxr_linenumber" name="421" href="#421">421</a>   <strong class="jxr_keyword">public</strong> List&lt;T&gt; getChildren(String parentPath, List&lt;Stat&gt; stats, <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="422" href="#422">422</a>   {
-<a class="jxr_linenumber" name="423" href="#423">423</a>     <strong class="jxr_keyword">try</strong>
-<a class="jxr_linenumber" name="424" href="#424">424</a>     {
-<a class="jxr_linenumber" name="425" href="#425">425</a>       <em class="jxr_comment">// prepare child paths</em>
-<a class="jxr_linenumber" name="426" href="#426">426</a>       List&lt;String&gt; childNames = getChildNames(parentPath, options);
-<a class="jxr_linenumber" name="427" href="#427">427</a>       <strong class="jxr_keyword">if</strong> (childNames == <strong class="jxr_keyword">null</strong> || childNames.size() == 0)
-<a class="jxr_linenumber" name="428" href="#428">428</a>       {
-<a class="jxr_linenumber" name="429" href="#429">429</a>         <strong class="jxr_keyword">return</strong> Collections.emptyList();
-<a class="jxr_linenumber" name="430" href="#430">430</a>       }
-<a class="jxr_linenumber" name="431" href="#431">431</a> 
-<a class="jxr_linenumber" name="432" href="#432">432</a>       List&lt;String&gt; paths = <strong class="jxr_keyword">new</strong> ArrayList&lt;String&gt;();
-<a class="jxr_linenumber" name="433" href="#433">433</a>       <strong class="jxr_keyword">for</strong> (String childName : childNames)
-<a class="jxr_linenumber" name="434" href="#434">434</a>       {
-<a class="jxr_linenumber" name="435" href="#435">435</a>         String path = parentPath + <span class="jxr_string">"/"</span> + childName;
-<a class="jxr_linenumber" name="436" href="#436">436</a>         paths.add(path);
-<a class="jxr_linenumber" name="437" href="#437">437</a>       }
-<a class="jxr_linenumber" name="438" href="#438">438</a> 
-<a class="jxr_linenumber" name="439" href="#439">439</a>       <em class="jxr_comment">// remove null record</em>
-<a class="jxr_linenumber" name="440" href="#440">440</a>       List&lt;Stat&gt; curStats = <strong class="jxr_keyword">new</strong> ArrayList&lt;Stat&gt;(paths.size());
-<a class="jxr_linenumber" name="441" href="#441">441</a>       List&lt;T&gt; records = get(paths, curStats, options);
-<a class="jxr_linenumber" name="442" href="#442">442</a>       Iterator&lt;T&gt; recordIter = records.iterator();
-<a class="jxr_linenumber" name="443" href="#443">443</a>       Iterator&lt;Stat&gt; statIter = curStats.iterator();
-<a class="jxr_linenumber" name="444" href="#444">444</a>       <strong class="jxr_keyword">while</strong> (statIter.hasNext())
-<a class="jxr_linenumber" name="445" href="#445">445</a>       {
-<a class="jxr_linenumber" name="446" href="#446">446</a>         recordIter.next();
-<a class="jxr_linenumber" name="447" href="#447">447</a>         <strong class="jxr_keyword">if</strong> (statIter.next() == <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="448" href="#448">448</a>         {
-<a class="jxr_linenumber" name="449" href="#449">449</a>           statIter.remove();
-<a class="jxr_linenumber" name="450" href="#450">450</a>           recordIter.remove();
-<a class="jxr_linenumber" name="451" href="#451">451</a>         }
-<a class="jxr_linenumber" name="452" href="#452">452</a>       }
-<a class="jxr_linenumber" name="453" href="#453">453</a> 
-<a class="jxr_linenumber" name="454" href="#454">454</a>       <strong class="jxr_keyword">if</strong> (stats != <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="455" href="#455">455</a>       {
-<a class="jxr_linenumber" name="456" href="#456">456</a>         stats.clear();
-<a class="jxr_linenumber" name="457" href="#457">457</a>         stats.addAll(curStats);
-<a class="jxr_linenumber" name="458" href="#458">458</a>       }
-<a class="jxr_linenumber" name="459" href="#459">459</a> 
-<a class="jxr_linenumber" name="460" href="#460">460</a>       <strong class="jxr_keyword">return</strong> records;
-<a class="jxr_linenumber" name="461" href="#461">461</a>     }
-<a class="jxr_linenumber" name="462" href="#462">462</a>     <strong class="jxr_keyword">catch</strong> (ZkNoNodeException e)
-<a class="jxr_linenumber" name="463" href="#463">463</a>     {
-<a class="jxr_linenumber" name="464" href="#464">464</a>       <strong class="jxr_keyword">return</strong> Collections.emptyList();
-<a class="jxr_linenumber" name="465" href="#465">465</a>     }
-<a class="jxr_linenumber" name="466" href="#466">466</a>   }
-<a class="jxr_linenumber" name="467" href="#467">467</a> 
-<a class="jxr_linenumber" name="468" href="#468">468</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="469" href="#469">469</a> <em class="jxr_javadoccomment">   * sync getChildNames</em>
-<a class="jxr_linenumber" name="470" href="#470">470</a> <em class="jxr_javadoccomment">   * </em>
-<a class="jxr_linenumber" name="471" href="#471">471</a> <em class="jxr_javadoccomment">   * @return null if parentPath doesn't exist</em>
-<a class="jxr_linenumber" name="472" href="#472">472</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="473" href="#473">473</a>   @Override
-<a class="jxr_linenumber" name="474" href="#474">474</a>   <strong class="jxr_keyword">public</strong> List&lt;String&gt; getChildNames(String parentPath, <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="475" href="#475">475</a>   {
-<a class="jxr_linenumber" name="476" href="#476">476</a>     <strong class="jxr_keyword">try</strong>
-<a class="jxr_linenumber" name="477" href="#477">477</a>     {
-<a class="jxr_linenumber" name="478" href="#478">478</a>       List&lt;String&gt; childNames = _zkClient.getChildren(parentPath);
-<a class="jxr_linenumber" name="479" href="#479">479</a>       Collections.sort(childNames);
-<a class="jxr_linenumber" name="480" href="#480">480</a>       <strong class="jxr_keyword">return</strong> childNames;
-<a class="jxr_linenumber" name="481" href="#481">481</a>     }
-<a class="jxr_linenumber" name="482" href="#482">482</a>     <strong class="jxr_keyword">catch</strong> (ZkNoNodeException e)
-<a class="jxr_linenumber" name="483" href="#483">483</a>     {
-<a class="jxr_linenumber" name="484" href="#484">484</a>       <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="485" href="#485">485</a>     }
-<a class="jxr_linenumber" name="486" href="#486">486</a>   }
-<a class="jxr_linenumber" name="487" href="#487">487</a> 
-<a class="jxr_linenumber" name="488" href="#488">488</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="489" href="#489">489</a> <em class="jxr_javadoccomment">   * sync exists</em>
-<a class="jxr_linenumber" name="490" href="#490">490</a> <em class="jxr_javadoccomment">   * </em>
-<a class="jxr_linenumber" name="491" href="#491">491</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="492" href="#492">492</a>   @Override
-<a class="jxr_linenumber" name="493" href="#493">493</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> exists(String path, <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="494" href="#494">494</a>   {
-<a class="jxr_linenumber" name="495" href="#495">495</a>     <strong class="jxr_keyword">return</strong> _zkClient.exists(path);
-<a class="jxr_linenumber" name="496" href="#496">496</a>   }
-<a class="jxr_linenumber" name="497" href="#497">497</a> 
-<a class="jxr_linenumber" name="498" href="#498">498</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="499" href="#499">499</a> <em class="jxr_javadoccomment">   * sync getStat</em>
-<a class="jxr_linenumber" name="500" href="#500">500</a> <em class="jxr_javadoccomment">   * </em>
-<a class="jxr_linenumber" name="501" href="#501">501</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="502" href="#502">502</a>   @Override
-<a class="jxr_linenumber" name="503" href="#503">503</a>   <strong class="jxr_keyword">public</strong> Stat getStat(String path, <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="504" href="#504">504</a>   {
-<a class="jxr_linenumber" name="505" href="#505">505</a>     <strong class="jxr_keyword">return</strong> _zkClient.getStat(path);
-<a class="jxr_linenumber" name="506" href="#506">506</a>   }
-<a class="jxr_linenumber" name="507" href="#507">507</a> 
-<a class="jxr_linenumber" name="508" href="#508">508</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="509" href="#509">509</a> <em class="jxr_javadoccomment">   * sync remove</em>
-<a class="jxr_linenumber" name="510" href="#510">510</a> <em class="jxr_javadoccomment">   * </em>
-<a class="jxr_linenumber" name="511" href="#511">511</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="512" href="#512">512</a>   @Override
-<a class="jxr_linenumber" name="513" href="#513">513</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> remove(String path, <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="514" href="#514">514</a>   {
-<a class="jxr_linenumber" name="515" href="#515">515</a>     <strong class="jxr_keyword">try</strong>
-<a class="jxr_linenumber" name="516" href="#516">516</a>     {
-<a class="jxr_linenumber" name="517" href="#517">517</a>       <em class="jxr_comment">// optimize on common path</em>
-<a class="jxr_linenumber" name="518" href="#518">518</a>       _zkClient.delete(path);
-<a class="jxr_linenumber" name="519" href="#519">519</a>     }
-<a class="jxr_linenumber" name="520" href="#520">520</a>     <strong class="jxr_keyword">catch</strong> (ZkException e)
-<a class="jxr_linenumber" name="521" href="#521">521</a>     {
-<a class="jxr_linenumber" name="522" href="#522">522</a>       _zkClient.deleteRecursive(path);
-<a class="jxr_linenumber" name="523" href="#523">523</a>     }
-<a class="jxr_linenumber" name="524" href="#524">524</a>     <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
-<a class="jxr_linenumber" name="525" href="#525">525</a>   }
-<a class="jxr_linenumber" name="526" href="#526">526</a> 
-<a class="jxr_linenumber" name="527" href="#527">527</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="528" href="#528">528</a> <em class="jxr_javadoccomment">   * async create. give up on error other than NONODE</em>
-<a class="jxr_linenumber" name="529" href="#529">529</a> <em class="jxr_javadoccomment">   * </em>
-<a class="jxr_linenumber" name="530" href="#530">530</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="531" href="#531">531</a>   <a href="../../../../../org/apache/helix/manager/zk/ZkAsyncCallbacks.html">CreateCallbackHandler</a>[] create(List&lt;String&gt; paths,
-<a class="jxr_linenumber" name="532" href="#532">532</a>                                  List&lt;T&gt; records,
-<a class="jxr_linenumber" name="533" href="#533">533</a>                                  <strong class="jxr_keyword">boolean</strong>[] needCreate,
-<a class="jxr_linenumber" name="534" href="#534">534</a>                                  List&lt;List&lt;String&gt;&gt; pathsCreated,
-<a class="jxr_linenumber" name="535" href="#535">535</a>                                  <strong class="jxr_keyword">int</strong> options)
-<a class="jxr_linenumber" name="536" href="#536">536</a>   {
-<a class="jxr_linenumber" name="537" href="#537">537</a>     <strong class="jxr_keyword">if</strong> ((records != <strong class="jxr_keyword">null</strong> &amp;&amp; records.size() != paths.size())
-<a class="jxr_linenumber" name="538" href="#538">538</a>         || needCreate.length != paths.size()
-<a class="jxr_linenumber" name="539" href="#539">539</a>         || (pathsCreated != <strong class="jxr_keyword">null</strong> &amp;&amp; pathsCreated.size() != paths.size()))
-<a class="jxr_linenumber" name="540" href="#540">540</a>     {
-<a class="jxr_linenumber" name="541" href="#541">541</a>       <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"paths, records, needCreate, and pathsCreated should be of same size"</span>);
-<a class="jxr_linenumber" name="542" href="#542">542</a>     }
-<a class="jxr_linenumber" name="543" href="#543">543</a> 
-<a class="jxr_linenumber" name="544" href="#544">544</a>     <a href="../../../../../org/apache/helix/manager/zk/ZkAsyncCallbacks.html">CreateCallbackHandler</a>[] cbList = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/manager/zk/ZkAsyncCallbacks.html">CreateCallbackHandler</a>[paths.size()];
-<a class="jxr_linenumber" name="545" href="#545">545</a> 
-<a class="jxr_linenumber" name="546" href="#546">546</a>     CreateMode mode = AccessOption.getMode(options);
-<a class="jxr_linenumber" name="547" href="#547">547</a>     <strong class="jxr_keyword">if</strong> (mode == <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="548" href="#548">548</a>     {
-<a class="jxr_linenumber" name="549" href="#549">549</a>       LOG.error(<span class="jxr_string">"Invalid async set mode. options: "</span> + options);
-<a class="jxr_linenumber" name="550" href="#550">550</a>       <strong class="jxr_keyword">return</strong> cbList;
-<a class="jxr_linenumber" name="551" href="#551">551</a>     }
-<a class="jxr_linenumber" name="552" href="#552">552</a> 
-<a class="jxr_linenumber" name="553" href="#553">553</a>     <strong class="jxr_keyword">boolean</strong> retry;
-<a class="jxr_linenumber" name="554" href="#554">554</a>     <strong class="jxr_keyword">do</strong>
-<a class="jxr_linenumber" name="555" href="#555">555</a>     {
-<a class="jxr_linenumber" name="556" href="#556">556</a>       retry = false;
-<a class="jxr_linenumber" name="557" href="#557">557</a> 
-<a class="jxr_linenumber" name="558" href="#558">558</a>       <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; paths.size(); i++)
-<a class="jxr_linenumber" name="559" href="#559">559</a>       {
-<a class="jxr_linenumber" name="560" href="#560">560</a>         <strong class="jxr_keyword">if</strong> (!needCreate[i])
-<a class="jxr_linenumber" name="561" href="#561">561</a>           <strong class="jxr_keyword">continue</strong>;
-<a class="jxr_linenumber" name="562" href="#562">562</a> 
-<a class="jxr_linenumber" name="563" href="#563">563</a>         String path = paths.get(i);
-<a class="jxr_linenumber" name="564" href="#564">564</a>         T record = records == <strong class="jxr_keyword">null</strong> ? <strong class="jxr_keyword">null</strong> : records.get(i);
-<a class="jxr_linenumber" name="565" href="#565">565</a>         cbList[i] = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/manager/zk/ZkAsyncCallbacks.html">CreateCallbackHandler</a>();
-<a class="jxr_linenumber" name="566" href="#566">566</a>         _zkClient.asyncCreate(path, record, mode, cbList[i]);
-<a class="jxr_linenumber" name="567" href="#567">567</a>       }
-<a class="jxr_linenumber" name="568" href="#568">568</a> 
-<a class="jxr_linenumber" name="569" href="#569">569</a>       List&lt;String&gt; parentPaths =
-<a class="jxr_linenumber" name="570" href="#570">570</a>           <strong class="jxr_keyword">new</strong> ArrayList&lt;String&gt;(Collections.&lt;String&gt; nCopies(paths.size(), <strong class="jxr_keyword">null</strong>));
-<a class="jxr_linenumber" name="571" href="#571">571</a>       <strong class="jxr_keyword">boolean</strong> failOnNoNode = false;
-<a class="jxr_linenumber" name="572" href="#572">572</a> 
-<a class="jxr_linenumber" name="573" href="#573">573</a>       <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; paths.size(); i++)
-<a class="jxr_linenumber" name="574" href="#574">574</a>       {
-<a class="jxr_linenumber" name="575" href="#575">575</a>         <strong class="jxr_keyword">if</strong> (!needCreate[i])
-<a class="jxr_linenumber" name="576" href="#576">576</a>           <strong class="jxr_keyword">continue</strong>;
-<a class="jxr_linenumber" name="577" href="#577">577</a> 
-<a class="jxr_linenumber" name="578" href="#578">578</a>         <a href="../../../../../org/apache/helix/manager/zk/ZkAsyncCallbacks.html">CreateCallbackHandler</a> cb = cbList[i];
-<a class="jxr_linenumber" name="579" href="#579">579</a>         cb.waitForSuccess();
-<a class="jxr_linenumber" name="580" href="#580">580</a>         String path = paths.get(i);
-<a class="jxr_linenumber" name="581" href="#581">581</a> 
-<a class="jxr_linenumber" name="582" href="#582">582</a>         <strong class="jxr_keyword">if</strong> (Code.get(cb.getRc()) == Code.NONODE)
-<a class="jxr_linenumber" name="583" href="#583">583</a>         {
-<a class="jxr_linenumber" name="584" href="#584">584</a>           String parentPath = <strong class="jxr_keyword">new</strong> File(path).getParent();
-<a class="jxr_linenumber" name="585" href="#585">585</a>           parentPaths.set(i, parentPath);
-<a class="jxr_linenumber" name="586" href="#586">586</a>           failOnNoNode = <strong class="jxr_keyword">true</strong>;
-<a class="jxr_linenumber" name="587" href="#587">587</a>         }
-<a class="jxr_linenumber" name="588" href="#588">588</a>         <strong class="jxr_keyword">else</strong>
-<a class="jxr_linenumber" name="589" href="#589">589</a>         {
-<a class="jxr_linenumber" name="590" href="#590">590</a>           <em class="jxr_comment">// if create succeed or fail on error other than NONODE,</em>
-<a class="jxr_linenumber" name="591" href="#591">591</a>           <em class="jxr_comment">// give up</em>
-<a class="jxr_linenumber" name="592" href="#592">592</a>           needCreate[i] = false;
-<a class="jxr_linenumber" name="593" href="#593">593</a> 
-<a class="jxr_linenumber" name="594" href="#594">594</a>           <em class="jxr_comment">// if succeeds, record what paths we've created</em>
-<a class="jxr_linenumber" name="595" href="#595">595</a>           <strong class="jxr_keyword">if</strong> (Code.get(cb.getRc()) == Code.OK &amp;&amp; pathsCreated != <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="596" href="#596">596</a>           {
-<a class="jxr_linenumber" name="597" href="#597">597</a>             <strong class="jxr_keyword">if</strong> (pathsCreated.get(i) == <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="598" href="#598">598</a>             {
-<a class="jxr_linenumber" name="599" href="#599">599</a>               pathsCreated.set(i, <strong class="jxr_keyword">new</strong> ArrayList&lt;String&gt;());
-<a class="jxr_linenumber" name="600" href="#600">600</a>             }
-<a class="jxr_linenumber" name="601" href="#601">601</a>             pathsCreated.get(i).add(path);
-<a class="jxr_linenumber" name="602" href="#602">602</a>           }
-<a class="jxr_linenumber" name="603" href="#603">603</a>         }
-<a class="jxr_linenumber" name="604" href="#604">604</a>       }
-<a class="jxr_linenumber" name="605" href="#605">605</a> 
-<a class="jxr_linenumber" name="606" href="#606">606</a>       <strong class="jxr_keyword">if</strong> (failOnNoNode)
-<a class="jxr_linenumber" name="607" href="#607">607</a>       {
-<a class="jxr_linenumber" name="608" href="#608">608</a>         <strong class="jxr_keyword">boolean</strong>[] needCreateParent = Arrays.copyOf(needCreate, needCreate.length);
-<a class="jxr_linenumber" name="609" href="#609">609</a> 
-<a class="jxr_linenumber" name="610" href="#610">610</a>         <a href="../../../../../org/apache/helix/manager/zk/ZkAsyncCallbacks.html">CreateCallbackHandler</a>[] parentCbList =
-<a class="jxr_linenumber" name="611" href="#611">611</a>             create(parentPaths, <strong class="jxr_keyword">null</strong>, needCreateParent, pathsCreated, AccessOption.PERSISTENT);
-<a class="jxr_linenumber" name="612" href="#612">612</a>         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; parentCbList.length; i++)
-<a class="jxr_linenumber" name="613" href="#613">613</a>         {
-<a class="jxr_linenumber" name="614" href="#614">614</a>           <a href="../../../../../org/apache/helix/manager/zk/ZkAsyncCallbacks.html">CreateCallbackHandler</a> parentCb = parentCbList[i];
-<a class="jxr_linenumber" name="615" href="#615">615</a>           <strong class="jxr_keyword">if</strong> (parentCb == <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="616" href="#616">616</a>             <strong class="jxr_keyword">continue</strong>;
-<a class="jxr_linenumber" name="617" href="#617">617</a> 
-<a class="jxr_linenumber" name="618" href="#618">618</a>           Code rc = Code.get(parentCb.getRc());
-<a class="jxr_linenumber" name="619" href="#619">619</a> 
-<a class="jxr_linenumber" name="620" href="#620">620</a>           <em class="jxr_comment">// if parent is created, retry create child</em>
-<a class="jxr_linenumber" name="621" href="#621">621</a>           <strong class="jxr_keyword">if</strong> (rc == Code.OK || rc == Code.NODEEXISTS)
-<a class="jxr_linenumber" name="622" href="#622">622</a>           {
-<a class="jxr_linenumber" name="623" href="#623">623</a>             retry = <strong class="jxr_keyword">true</strong>;
-<a class="jxr_linenumber" name="624" href="#624">624</a>             <strong class="jxr_keyword">break</strong>;
-<a class="jxr_linenumber" name="625" href="#625">625</a>           }
-<a class="jxr_linenumber" name="626" href="#626">626</a>         }
-<a class="jxr_linenumber" name="627" href="#627">627</a>       }
-<a class="jxr_linenumber" name="628" href="#628">628</a>     }
-<a class="jxr_linenumber" name="629" href="#629">629</a>     <strong class="jxr_keyword">while</strong> (retry);
-<a class="jxr_linenumber" name="630" href="#630">630</a> 
-<a class="jxr_linenumber" name="631" href="#631">631</a>     <strong class="jxr_keyword">return</strong> cbList;
-<a class="jxr_linenumber" name="632" href="#632">632</a>   }
-<a class="jxr_linenumber" name="633" href="#633">633</a> 
+<a class="jxr_linenumber" name="52" href="#52">52</a>  
+<a class="jxr_linenumber" name="53" href="#53">53</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> ZkBaseDataAccessor&lt;T&gt; <strong class="jxr_keyword">implements</strong> BaseDataAccessor&lt;T&gt;
+<a class="jxr_linenumber" name="54" href="#54">54</a>  {
+<a class="jxr_linenumber" name="55" href="#55">55</a>    enum <a href="../../../../../org/apache/helix/manager/zk/ZkBaseDataAccessor.html">RetCode</a>
+<a class="jxr_linenumber" name="56" href="#56">56</a>    {
+<a class="jxr_linenumber" name="57" href="#57">57</a>      OK, NODE_EXISTS, ERROR
+<a class="jxr_linenumber" name="58" href="#58">58</a>    }
+<a class="jxr_linenumber" name="59" href="#59">59</a>  
+<a class="jxr_linenumber" name="60" href="#60">60</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> Logger  LOG = Logger.getLogger(ZkBaseDataAccessor.<strong class="jxr_keyword">class</strong>);
+<a class="jxr_linenumber" name="61" href="#61">61</a>  
+<a class="jxr_linenumber" name="62" href="#62">62</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/helix/manager/zk/ZkClient.html">ZkClient</a> _zkClient;
+<a class="jxr_linenumber" name="63" href="#63">63</a>  
+<a class="jxr_linenumber" name="64" href="#64">64</a>    <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/helix/manager/zk/ZkBaseDataAccessor.html">ZkBaseDataAccessor</a>(<a href="../../../../../org/apache/helix/manager/zk/ZkClient.html">ZkClient</a> zkClient)
+<a class="jxr_linenumber" name="65" href="#65">65</a>    {
+<a class="jxr_linenumber" name="66" href="#66">66</a>      _zkClient = zkClient;
+<a class="jxr_linenumber" name="67" href="#67">67</a>    }
+<a class="jxr_linenumber" name="68" href="#68">68</a>  
+<a class="jxr_linenumber" name="69" href="#69">69</a>    <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="70" href="#70">70</a>  <em class="jxr_javadoccomment">   * sync create</em>
+<a class="jxr_linenumber" name="71" href="#71">71</a>  <em class="jxr_javadoccomment">   */</em>
+<a class="jxr_linenumber" name="72" href="#72">72</a>    @Override
+<a class="jxr_linenumber" name="73" href="#73">73</a>    <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> create(String path, T record, <strong class="jxr_keyword">int</strong> options)
+<a class="jxr_linenumber" name="74" href="#74">74</a>    {
+<a class="jxr_linenumber" name="75" href="#75">75</a>      <strong class="jxr_keyword">return</strong> create(path, record, <strong class="jxr_keyword">null</strong>, options) == RetCode.OK;
+<a class="jxr_linenumber" name="76" href="#76">76</a>    }
+<a class="jxr_linenumber" name="77" href="#77">77</a>  
+<a class="jxr_linenumber" name="78" href="#78">78</a>    <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="79" href="#79">79</a>  <em class="jxr_javadoccomment">   * sync create</em>
+<a class="jxr_linenumber" name="80" href="#80">80</a>  <em class="jxr_javadoccomment">   */</em>
+<a class="jxr_linenumber" name="81" href="#81">81</a>    <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/helix/manager/zk/ZkBaseDataAccessor.html">RetCode</a> create(String path, T record, List&lt;String&gt; pathCreated, <strong class="jxr_keyword">int</strong> options)
+<a class="jxr_linenumber" name="82" href="#82">82</a>    {
+<a class="jxr_linenumber" name="83" href="#83">83</a>      CreateMode mode = AccessOption.getMode(options);
+<a class="jxr_linenumber" name="84" href="#84">84</a>      <strong class="jxr_keyword">if</strong> (mode == <strong class="jxr_keyword">null</strong>)
+<a class="jxr_linenumber" name="85" href="#85">85</a>      {
+<a class="jxr_linenumber" name="86" href="#86">86</a>        LOG.error(<span class="jxr_string">"Invalid create mode. options: "</span> + options);
+<a class="jxr_linenumber" name="87" href="#87">87</a>        <strong class="jxr_keyword">return</strong> RetCode.ERROR;
+<a class="jxr_linenumber" name="88" href="#88">88</a>      }
+<a class="jxr_linenumber" name="89" href="#89">89</a>  
+<a class="jxr_linenumber" name="90" href="#90">90</a>      <strong class="jxr_keyword">boolean</strong> retry;
+<a class="jxr_linenumber" name="91" href="#91">91</a>      <strong class="jxr_keyword">do</strong>
+<a class="jxr_linenumber" name="92" href="#92">92</a>      {
+<a class="jxr_linenumber" name="93" href="#93">93</a>        retry = false;
+<a class="jxr_linenumber" name="94" href="#94">94</a>        <strong class="jxr_keyword">try</strong>
+<a class="jxr_linenumber" name="95" href="#95">95</a>        {
+<a class="jxr_linenumber" name="96" href="#96">96</a>          _zkClient.create(path, record, mode);
+<a class="jxr_linenumber" name="97" href="#97">97</a>          <strong class="jxr_keyword">if</strong> (pathCreated != <strong class="jxr_keyword">null</strong>)
+<a class="jxr_linenumber" name="98" href="#98">98</a>            pathCreated.add(path);
+<a class="jxr_linenumber" name="99" href="#99">99</a>  
+<a class="jxr_linenumber" name="100" href="#100">100</a>         <strong class="jxr_keyword">return</strong> RetCode.OK;
+<a class="jxr_linenumber" name="101" href="#101">101</a>       }
+<a class="jxr_linenumber" name="102" href="#102">102</a>       <strong class="jxr_keyword">catch</strong> (ZkNoNodeException e)
+<a class="jxr_linenumber" name="103" href="#103">103</a>       {
+<a class="jxr_linenumber" name="104" href="#104">104</a>         <em class="jxr_comment">// this will happen if parent node does not exist</em>
+<a class="jxr_linenumber" name="105" href="#105">105</a>         String parentPath = HelixUtil.getZkParentPath(path);
+<a class="jxr_linenumber" name="106" href="#106">106</a>         <strong class="jxr_keyword">try</strong>
+<a class="jxr_linenumber" name="107" href="#107">107</a>         {
+<a class="jxr_linenumber" name="108" href="#108">108</a>           <a href="../../../../../org/apache/helix/manager/zk/ZkBaseDataAccessor.html">RetCode</a> rc = create(parentPath, <strong class="jxr_keyword">null</strong>, pathCreated, AccessOption.PERSISTENT);
+<a class="jxr_linenumber" name="109" href="#109">109</a>           <strong class="jxr_keyword">if</strong> (rc == RetCode.OK || rc == RetCode.NODE_EXISTS)
+<a class="jxr_linenumber" name="110" href="#110">110</a>           {
+<a class="jxr_linenumber" name="111" href="#111">111</a>             <em class="jxr_comment">// if parent node created/exists, retry</em>
+<a class="jxr_linenumber" name="112" href="#112">112</a>             retry = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="113" href="#113">113</a>           }
+<a class="jxr_linenumber" name="114" href="#114">114</a>         }
+<a class="jxr_linenumber" name="115" href="#115">115</a>         <strong class="jxr_keyword">catch</strong> (Exception e1)
+<a class="jxr_linenumber" name="116" href="#116">116</a>         {
+<a class="jxr_linenumber" name="117" href="#117">117</a>           LOG.error(<span class="jxr_string">"Exception while creating path: "</span> + parentPath, e1);
+<a class="jxr_linenumber" name="118" href="#118">118</a>           <strong class="jxr_keyword">return</strong> RetCode.ERROR;
+<a class="jxr_linenumber" name="119" href="#119">119</a>         }
+<a class="jxr_linenumber" name="120" href="#120">120</a>       }
+<a class="jxr_linenumber" name="121" href="#121">121</a>       <strong class="jxr_keyword">catch</strong> (ZkNodeExistsException e)
+<a class="jxr_linenumber" name="122" href="#122">122</a>       {
+<a class="jxr_linenumber" name="123" href="#123">123</a>         LOG.warn(<span class="jxr_string">"Node already exists. path: "</span> + path);
+<a class="jxr_linenumber" name="124" href="#124">124</a>         <strong class="jxr_keyword">return</strong> RetCode.NODE_EXISTS;
+<a class="jxr_linenumber" name="125" href="#125">125</a>       }
+<a class="jxr_linenumber" name="126" href="#126">126</a>       <strong class="jxr_keyword">catch</strong> (Exception e)
+<a class="jxr_linenumber" name="127" href="#127">127</a>       {
+<a class="jxr_linenumber" name="128" href="#128">128</a>         LOG.error(<span class="jxr_string">"Exception while creating path: "</span> + path, e);
+<a class="jxr_linenumber" name="129" href="#129">129</a>         <strong class="jxr_keyword">return</strong> RetCode.ERROR;
+<a class="jxr_linenumber" name="130" href="#130">130</a>       }
+<a class="jxr_linenumber" name="131" href="#131">131</a>     }
+<a class="jxr_linenumber" name="132" href="#132">132</a>     <strong class="jxr_keyword">while</strong> (retry);
+<a class="jxr_linenumber" name="133" href="#133">133</a> 
+<a class="jxr_linenumber" name="134" href="#134">134</a>     <strong class="jxr_keyword">return</strong> RetCode.OK;
+<a class="jxr_linenumber" name="135" href="#135">135</a>   }
+<a class="jxr_linenumber" name="136" href="#136">136</a> 
+<a class="jxr_linenumber" name="137" href="#137">137</a>   <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="138" href="#138">138</a> <em class="jxr_javadoccomment">   * sync set</em>
+<a class="jxr_linenumber" name="139" href="#139">139</a> <em class="jxr_javadoccomment">   */</em>
+<a class="jxr_linenumber" name="140" href="#140">140</a>   @Override
+<a class="jxr_linenumber" name="141" href="#141">141</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> set(String path, T record, <strong class="jxr_keyword">int</strong> options)
+<a class="jxr_linenumber" name="142" href="#142">142</a>   {
+<a class="jxr_linenumber" name="143" href="#143">143</a>     <strong class="jxr_keyword">return</strong> set(path, record, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, -1, options);
+<a class="jxr_linenumber" name="144" href="#144">144</a>   }
+<a class="jxr_linenumber" name="145" href="#145">145</a> 
+<a class="jxr_linenumber" name="146" href="#146">146</a>   <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="147" href="#147">147</a> <em class="jxr_javadoccomment">   * sync set</em>
+<a class="jxr_linenumber" name="148" href="#148">148</a> <em class="jxr_javadoccomment">   * </em>
+<a class="jxr_linenumber" name="149" href="#149">149</a> <em class="jxr_javadoccomment">   * @param setstat</em>
+<a class="jxr_linenumber" name="150" href="#150">150</a> <em class="jxr_javadoccomment">   *          : if node is created instead of set, stat will NOT be set</em>
+<a class="jxr_linenumber" name="151" href="#151">151</a> <em class="jxr_javadoccomment">   */</em>
+<a class="jxr_linenumber" name="152" href="#152">152</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> set(String path,
+<a class="jxr_linenumber" name="153" href="#153">153</a>                      T record,
+<a class="jxr_linenumber" name="154" href="#154">154</a>                      List&lt;String&gt; pathsCreated,
+<a class="jxr_linenumber" name="155" href="#155">155</a>                      Stat setstat,
+<a class="jxr_linenumber" name="156" href="#156">156</a>                      <strong class="jxr_keyword">int</strong> expectVersion,
+<a class="jxr_linenumber" name="157" href="#157">157</a>                      <strong class="jxr_keyword">int</strong> options)
+<a class="jxr_linenumber" name="158" href="#158">158</a>   {
+<a class="jxr_linenumber" name="159" href="#159">159</a>     CreateMode mode = AccessOption.getMode(options);
+<a class="jxr_linenumber" name="160" href="#160">160</a>     <strong class="jxr_keyword">if</strong> (mode == <strong class="jxr_keyword">null</strong>)
+<a class="jxr_linenumber" name="161" href="#161">161</a>     {
+<a class="jxr_linenumber" name="162" href="#162">162</a>       LOG.error(<span class="jxr_string">"Invalid set mode. options: "</span> + options);
+<a class="jxr_linenumber" name="163" href="#163">163</a>       <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="164" href="#164">164</a>     }
+<a class="jxr_linenumber" name="165" href="#165">165</a> 
+<a class="jxr_linenumber" name="166" href="#166">166</a>     <strong class="jxr_keyword">boolean</strong> retry;
+<a class="jxr_linenumber" name="167" href="#167">167</a>     <strong class="jxr_keyword">do</strong>
+<a class="jxr_linenumber" name="168" href="#168">168</a>     {
+<a class="jxr_linenumber" name="169" href="#169">169</a>       retry = false;
+<a class="jxr_linenumber" name="170" href="#170">170</a>       <strong class="jxr_keyword">try</strong>
+<a class="jxr_linenumber" name="171" href="#171">171</a>       {
+<a class="jxr_linenumber" name="172" href="#172">172</a>         <em class="jxr_comment">// _zkClient.writeData(path, record);</em>
+<a class="jxr_linenumber" name="173" href="#173">173</a>         Stat setStat = _zkClient.writeDataGetStat(path, record, expectVersion);
+<a class="jxr_linenumber" name="174" href="#174">174</a>         <strong class="jxr_keyword">if</strong> (setstat != <strong class="jxr_keyword">null</strong>)
+<a class="jxr_linenumber" name="175" href="#175">175</a>           DataTree.copyStat(setStat, setstat);
+<a class="jxr_linenumber" name="176" href="#176">176</a>       }
+<a class="jxr_linenumber" name="177" href="#177">177</a>       <strong class="jxr_keyword">catch</strong> (ZkNoNodeException e)
+<a class="jxr_linenumber" name="178" href="#178">178</a>       {
+<a class="jxr_linenumber" name="179" href="#179">179</a>         <em class="jxr_comment">// node not exists, try create. in this case, stat will not be set</em>
+<a class="jxr_linenumber" name="180" href="#180">180</a>         <strong class="jxr_keyword">try</strong>
+<a class="jxr_linenumber" name="181" href="#181">181</a>         {
+<a class="jxr_linenumber" name="182" href="#182">182</a>           <a href="../../../../../org/apache/helix/manager/zk/ZkBaseDataAccessor.html">RetCode</a> rc = create(path, record, pathsCreated, options);
+<a class="jxr_linenumber" name="183" href="#183">183</a>           <em class="jxr_comment">// if (rc == RetCode.OK || rc == RetCode.NODE_EXISTS)</em>
+<a class="jxr_linenumber" name="184" href="#184">184</a>           <em class="jxr_comment">// retry = true;</em>
+<a class="jxr_linenumber" name="185" href="#185">185</a>           <strong class="jxr_keyword">switch</strong> (rc)
+<a class="jxr_linenumber" name="186" href="#186">186</a>           {
+<a class="jxr_linenumber" name="187" href="#187">187</a>           <strong class="jxr_keyword">case</strong> OK:
+<a class="jxr_linenumber" name="188" href="#188">188</a>             <em class="jxr_comment">// not set stat if node is created (instead of set)</em>
+<a class="jxr_linenumber" name="189" href="#189">189</a>             <strong class="jxr_keyword">break</strong>;
+<a class="jxr_linenumber" name="190" href="#190">190</a>           <strong class="jxr_keyword">case</strong> NODE_EXISTS:
+<a class="jxr_linenumber" name="191" href="#191">191</a>             retry = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="192" href="#192">192</a>             <strong class="jxr_keyword">break</strong>;
+<a class="jxr_linenumber" name="193" href="#193">193</a>           <strong class="jxr_keyword">default</strong>:
+<a class="jxr_linenumber" name="194" href="#194">194</a>             LOG.error(<span class="jxr_string">"Fail to set path by creating: "</span> + path);
+<a class="jxr_linenumber" name="195" href="#195">195</a>             <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="196" href="#196">196</a>           }
+<a class="jxr_linenumber" name="197" href="#197">197</a>         }
+<a class="jxr_linenumber" name="198" href="#198">198</a>         <strong class="jxr_keyword">catch</strong> (Exception e1)
+<a class="jxr_linenumber" name="199" href="#199">199</a>         {
+<a class="jxr_linenumber" name="200" href="#200">200</a>           LOG.error(<span class="jxr_string">"Exception while setting path by creating: "</span> + path, e);
+<a class="jxr_linenumber" name="201" href="#201">201</a>           <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="202" href="#202">202</a>         }
+<a class="jxr_linenumber" name="203" href="#203">203</a>       }
+<a class="jxr_linenumber" name="204" href="#204">204</a>       <strong class="jxr_keyword">catch</strong> (ZkBadVersionException e)
+<a class="jxr_linenumber" name="205" href="#205">205</a>       {
+<a class="jxr_linenumber" name="206" href="#206">206</a>         <strong class="jxr_keyword">throw</strong> e;
+<a class="jxr_linenumber" name="207" href="#207">207</a>       }
+<a class="jxr_linenumber" name="208" href="#208">208</a>       <strong class="jxr_keyword">catch</strong> (Exception e)
+<a class="jxr_linenumber" name="209" href="#209">209</a>       {
+<a class="jxr_linenumber" name="210" href="#210">210</a>         LOG.error(<span class="jxr_string">"Exception while setting path: "</span> + path, e);
+<a class="jxr_linenumber" name="211" href="#211">211</a>         <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="212" href="#212">212</a>       }
+<a class="jxr_linenumber" name="213" href="#213">213</a>     }
+<a class="jxr_linenumber" name="214" href="#214">214</a>     <strong class="jxr_keyword">while</strong> (retry);
+<a class="jxr_linenumber" name="215" href="#215">215</a> 
+<a class="jxr_linenumber" name="216" href="#216">216</a>     <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="217" href="#217">217</a>   }
+<a class="jxr_linenumber" name="218" href="#218">218</a> 
+<a class="jxr_linenumber" name="219" href="#219">219</a>   <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="220" href="#220">220</a> <em class="jxr_javadoccomment">   * sync update</em>
+<a class="jxr_linenumber" name="221" href="#221">221</a> <em class="jxr_javadoccomment">   */</em>
+<a class="jxr_linenumber" name="222" href="#222">222</a>   @Override
+<a class="jxr_linenumber" name="223" href="#223">223</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> update(String path, DataUpdater&lt;T&gt; updater, <strong class="jxr_keyword">int</strong> options)
+<a class="jxr_linenumber" name="224" href="#224">224</a>   {
+<a class="jxr_linenumber" name="225" href="#225">225</a>     <strong class="jxr_keyword">return</strong> update(path, updater, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, options) != <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="226" href="#226">226</a>   }
+<a class="jxr_linenumber" name="227" href="#227">227</a> 
+<a class="jxr_linenumber" name="228" href="#228">228</a>   <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="229" href="#229">229</a> <em class="jxr_javadoccomment">   * sync update</em>
+<a class="jxr_linenumber" name="230" href="#230">230</a> <em class="jxr_javadoccomment">   * </em>
+<a class="jxr_linenumber" name="231" href="#231">231</a> <em class="jxr_javadoccomment">   * @return: updatedData on success, or null on fail</em>
+<a class="jxr_linenumber" name="232" href="#232">232</a> <em class="jxr_javadoccomment">   */</em>
+<a class="jxr_linenumber" name="233" href="#233">233</a>   <strong class="jxr_keyword">public</strong> T update(String path,
+<a class="jxr_linenumber" name="234" href="#234">234</a>                   DataUpdater&lt;T&gt; updater,
+<a class="jxr_linenumber" name="235" href="#235">235</a>                   List&lt;String&gt; createPaths,
+<a class="jxr_linenumber" name="236" href="#236">236</a>                   Stat stat,
+<a class="jxr_linenumber" name="237" href="#237">237</a>                   <strong class="jxr_keyword">int</strong> options)
+<a class="jxr_linenumber" name="238" href="#238">238</a>   {
+<a class="jxr_linenumber" name="239" href="#239">239</a>     CreateMode mode = AccessOption.getMode(options);
+<a class="jxr_linenumber" name="240" href="#240">240</a>     <strong class="jxr_keyword">if</strong> (mode == <strong class="jxr_keyword">null</strong>)
+<a class="jxr_linenumber" name="241" href="#241">241</a>     {
+<a class="jxr_linenumber" name="242" href="#242">242</a>       LOG.error(<span class="jxr_string">"Invalid update mode. options: "</span> + options);
+<a class="jxr_linenumber" name="243" href="#243">243</a>       <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="244" href="#244">244</a>     }
+<a class="jxr_linenumber" name="245" href="#245">245</a> 
+<a class="jxr_linenumber" name="246" href="#246">246</a>     <strong class="jxr_keyword">boolean</strong> retry;
+<a class="jxr_linenumber" name="247" href="#247">247</a>     T updatedData = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="248" href="#248">248</a>     <strong class="jxr_keyword">do</strong>
+<a class="jxr_linenumber" name="249" href="#249">249</a>     {
+<a class="jxr_linenumber" name="250" href="#250">250</a>       retry = false;
+<a class="jxr_linenumber" name="251" href="#251">251</a>       <strong class="jxr_keyword">try</strong>
+<a class="jxr_linenumber" name="252" href="#252">252</a>       {
+<a class="jxr_linenumber" name="253" href="#253">253</a>         Stat readStat = <strong class="jxr_keyword">new</strong> Stat();
+<a class="jxr_linenumber" name="254" href="#254">254</a>         T oldData = (T) _zkClient.readData(path, readStat);
+<a class="jxr_linenumber" name="255" href="#255">255</a>         T newData = updater.update(oldData);
+<a class="jxr_linenumber" name="256" href="#256">256</a>         Stat setStat = _zkClient.writeDataGetStat(path, newData, readStat.getVersion());
+<a class="jxr_linenumber" name="257" href="#257">257</a>         <strong class="jxr_keyword">if</strong> (stat != <strong class="jxr_keyword">null</strong>)
+<a class="jxr_linenumber" name="258" href="#258">258</a>         {
+<a class="jxr_linenumber" name="259" href="#259">259</a>           DataTree.copyStat(setStat, stat);
+<a class="jxr_linenumber" name="260" href="#260">260</a>         }
+<a class="jxr_linenumber" name="261" href="#261">261</a> 
+<a class="jxr_linenumber" name="262" href="#262">262</a>         updatedData = newData;
+<a class="jxr_linenumber" name="263" href="#263">263</a>       }
+<a class="jxr_linenumber" name="264" href="#264">264</a>       <strong class="jxr_keyword">catch</strong> (ZkBadVersionException e)
+<a class="jxr_linenumber" name="265" href="#265">265</a>       {
+<a class="jxr_linenumber" name="266" href="#266">266</a>         retry = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="267" href="#267">267</a>       }
+<a class="jxr_linenumber" name="268" href="#268">268</a>       <strong class="jxr_keyword">catch</strong> (ZkNoNodeException e)
+<a class="jxr_linenumber" name="269" href="#269">269</a>       {
+<a class="jxr_linenumber" name="270" href="#270">270</a>         <em class="jxr_comment">// node not exist, try create</em>
+<a class="jxr_linenumber" name="271" href="#271">271</a>         <strong class="jxr_keyword">try</strong>
+<a class="jxr_linenumber" name="272" href="#272">272</a>         {
+<a class="jxr_linenumber" name="273" href="#273">273</a>           T newData = updater.update(<strong class="jxr_keyword">null</strong>);
+<a class="jxr_linenumber" name="274" href="#274">274</a>           <a href="../../../../../org/apache/helix/manager/zk/ZkBaseDataAccessor.html">RetCode</a> rc = create(path, newData, createPaths, options);
+<a class="jxr_linenumber" name="275" href="#275">275</a>           <strong class="jxr_keyword">switch</strong> (rc)
+<a class="jxr_linenumber" name="276" href="#276">276</a>           {
+<a class="jxr_linenumber" name="277" href="#277">277</a>           <strong class="jxr_keyword">case</strong> OK:
+<a class="jxr_linenumber" name="278" href="#278">278</a>             updatedData = newData;
+<a class="jxr_linenumber" name="279" href="#279">279</a>             <strong class="jxr_keyword">break</strong>;
+<a class="jxr_linenumber" name="280" href="#280">280</a>           <strong class="jxr_keyword">case</strong> NODE_EXISTS:
+<a class="jxr_linenumber" name="281" href="#281">281</a>             retry = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="282" href="#282">282</a>             <strong class="jxr_keyword">break</strong>;
+<a class="jxr_linenumber" name="283" href="#283">283</a>           <strong class="jxr_keyword">default</strong>:
+<a class="jxr_linenumber" name="284" href="#284">284</a>             LOG.error(<span class="jxr_string">"Fail to update path by creating: "</span> + path);
+<a class="jxr_linenumber" name="285" href="#285">285</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="286" href="#286">286</a>           }
+<a class="jxr_linenumber" name="287" href="#287">287</a>         }
+<a class="jxr_linenumber" name="288" href="#288">288</a>         <strong class="jxr_keyword">catch</strong> (Exception e1)
+<a class="jxr_linenumber" name="289" href="#289">289</a>         {

[... 1642 lines stripped ...]


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