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From pste...@apache.org
Subject svn commit: r960468 [5/24] - in /websites/production/commons/content/proper/commons-pool/api-2.4.2: ./ org/ org/apache/ org/apache/commons/ org/apache/commons/pool2/ org/apache/commons/pool2/class-use/ org/apache/commons/pool2/impl/ org/apache/commons/...
Date Sun, 02 Aug 2015 00:07:35 GMT
Added: websites/production/commons/content/proper/commons-pool/api-2.4.2/org/apache/commons/pool2/KeyedPooledObjectFactory.html
==============================================================================
--- websites/production/commons/content/proper/commons-pool/api-2.4.2/org/apache/commons/pool2/KeyedPooledObjectFactory.html (added)
+++ websites/production/commons/content/proper/commons-pool/api-2.4.2/org/apache/commons/pool2/KeyedPooledObjectFactory.html Sun Aug  2 00:07:33 2015
@@ -0,0 +1,433 @@
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+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.commons.pool2</div>
+<h2 title="Interface KeyedPooledObjectFactory" class="title">Interface KeyedPooledObjectFactory&lt;K,V&gt;</h2>
+</div>
+<div class="contentContainer">
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt><span class="paramLabel">Type Parameters:</span></dt>
+<dd><code>K</code> - The type of keys managed by this factory.</dd>
+<dd><code>V</code> - Type of element managed by this factory.</dd>
+</dl>
+<dl>
+<dt>All Known Implementing Classes:</dt>
+<dd><a href="../../../../org/apache/commons/pool2/BaseKeyedPooledObjectFactory.html" title="class in org.apache.commons.pool2">BaseKeyedPooledObjectFactory</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public interface <span class="typeNameLabel">KeyedPooledObjectFactory&lt;K,V&gt;</span></pre>
+<div class="block">An interface defining life-cycle methods for
+ instances to be served by a <a href="../../../../org/apache/commons/pool2/KeyedObjectPool.html" title="interface in org.apache.commons.pool2"><code>KeyedObjectPool</code></a>.
+ <p>
+ By contract, when an <a href="../../../../org/apache/commons/pool2/KeyedObjectPool.html" title="interface in org.apache.commons.pool2"><code>KeyedObjectPool</code></a>
+ delegates to a <a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="interface in org.apache.commons.pool2"><code>KeyedPooledObjectFactory</code></a>,
+ <ol>
+  <li>
+   <a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#makeObject-K-"><code>makeObject(K)</code></a> is called whenever a new instance is needed.
+  </li>
+  <li>
+   <a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#activateObject-K-org.apache.commons.pool2.PooledObject-"><code>activateObject(K, org.apache.commons.pool2.PooledObject&lt;V&gt;)</code></a> is invoked on every instance that has been
+   <a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#passivateObject-K-org.apache.commons.pool2.PooledObject-"><code>passivated</code></a> before it is
+   <a href="../../../../org/apache/commons/pool2/KeyedObjectPool.html#borrowObject-K-"><code>borrowed</code></a> from the pool.
+  </li>
+  <li>
+   <a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#validateObject-K-org.apache.commons.pool2.PooledObject-"><code>validateObject(K, org.apache.commons.pool2.PooledObject&lt;V&gt;)</code></a> may be invoked on <a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#activateObject-K-org.apache.commons.pool2.PooledObject-"><code>activated</code></a>
+   instances to make sure they can be
+   <a href="../../../../org/apache/commons/pool2/KeyedObjectPool.html#borrowObject-K-"><code>borrowed</code></a> from the pool.
+   <code>validateObject</code> may also be used to test an
+   instance being <a href="../../../../org/apache/commons/pool2/KeyedObjectPool.html#returnObject-K-V-"><code>returned</code></a> to the pool
+   before it is <a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#passivateObject-K-org.apache.commons.pool2.PooledObject-"><code>passivated</code></a>. It will only be invoked
+   on an activated instance.
+  </li>
+  <li>
+   <a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#passivateObject-K-org.apache.commons.pool2.PooledObject-"><code>passivateObject</code></a>
+   is invoked on every instance when it is returned to the pool.
+  </li>
+  <li>
+   <a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#destroyObject-K-org.apache.commons.pool2.PooledObject-"><code>destroyObject</code></a>
+   is invoked on every instance when it is being "dropped" from the
+   pool (whether due to the response from <code>validateObject</code>,
+   or for reasons specific to the pool implementation.) There is no
+   guarantee that the instance being destroyed will
+   be considered active, passive or in a generally consistent state.
+  </li>
+ </ol>
+ <a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="interface in org.apache.commons.pool2"><code>KeyedPooledObjectFactory</code></a> must be thread-safe. The only promise
+ an <a href="../../../../org/apache/commons/pool2/KeyedObjectPool.html" title="interface in org.apache.commons.pool2"><code>KeyedObjectPool</code></a> makes is that the same instance of an object will
+ not be passed to more than one method of a
+ <code>KeyedPoolableObjectFactory</code> at a time.
+ <p>
+ While clients of a <a href="../../../../org/apache/commons/pool2/KeyedObjectPool.html" title="interface in org.apache.commons.pool2"><code>KeyedObjectPool</code></a> borrow and return instances of
+ the underlying value type V, the factory methods act on instances of
+ <a href="../../../../org/apache/commons/pool2/PooledObject.html" title="interface in org.apache.commons.pool2"><code>PooledObject&lt;V&gt;</code></a>.  These are the object wrappers that
+ pools use to track and maintain state informations about the objects that
+ they manage.</div>
+<dl>
+<dt><span class="simpleTagLabel">Since:</span></dt>
+<dd>2.0</dd>
+<dt><span class="simpleTagLabel">Version:</span></dt>
+<dd>$Revision: 1333925 $</dd>
+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a href="../../../../org/apache/commons/pool2/KeyedObjectPool.html" title="interface in org.apache.commons.pool2"><code>KeyedObjectPool</code></a>, 
+<a href="../../../../org/apache/commons/pool2/BaseKeyedPooledObjectFactory.html" title="class in org.apache.commons.pool2"><code>BaseKeyedPooledObjectFactory</code></a></dd>
+</dl>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
+<!-- ========== METHOD SUMMARY =========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method.summary">
+<!--   -->
+</a>
+<h3>Method Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
+<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr id="i0" class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#activateObject-K-org.apache.commons.pool2.PooledObject-">activateObject</a></span>(<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">K</a>&nbsp;key,
+              <a href="../../../../org/apache/commons/pool2/PooledObject.html" title="interface in org.apache.commons.pool2">PooledObject</a>&lt;<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">V</a>&gt;&nbsp;p)</code>
+<div class="block">Reinitialize an instance to be returned by the pool.</div>
+</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#destroyObject-K-org.apache.commons.pool2.PooledObject-">destroyObject</a></span>(<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">K</a>&nbsp;key,
+             <a href="../../../../org/apache/commons/pool2/PooledObject.html" title="interface in org.apache.commons.pool2">PooledObject</a>&lt;<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">V</a>&gt;&nbsp;p)</code>
+<div class="block">Destroy an instance no longer needed by the pool.</div>
+</td>
+</tr>
+<tr id="i2" class="altColor">
+<td class="colFirst"><code><a href="../../../../org/apache/commons/pool2/PooledObject.html" title="interface in org.apache.commons.pool2">PooledObject</a>&lt;<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">V</a>&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#makeObject-K-">makeObject</a></span>(<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">K</a>&nbsp;key)</code>
+<div class="block">Create an instance that can be served by the pool and
+ wrap it in a <a href="../../../../org/apache/commons/pool2/PooledObject.html" title="interface in org.apache.commons.pool2"><code>PooledObject</code></a> to be managed by the pool.</div>
+</td>
+</tr>
+<tr id="i3" class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#passivateObject-K-org.apache.commons.pool2.PooledObject-">passivateObject</a></span>(<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">K</a>&nbsp;key,
+               <a href="../../../../org/apache/commons/pool2/PooledObject.html" title="interface in org.apache.commons.pool2">PooledObject</a>&lt;<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">V</a>&gt;&nbsp;p)</code>
+<div class="block">Uninitialize an instance to be returned to the idle object pool.</div>
+</td>
+</tr>
+<tr id="i4" class="altColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#validateObject-K-org.apache.commons.pool2.PooledObject-">validateObject</a></span>(<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">K</a>&nbsp;key,
+              <a href="../../../../org/apache/commons/pool2/PooledObject.html" title="interface in org.apache.commons.pool2">PooledObject</a>&lt;<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">V</a>&gt;&nbsp;p)</code>
+<div class="block">Ensures that the instance is safe to be returned by the pool.</div>
+</td>
+</tr>
+</table>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="details">
+<ul class="blockList">
+<li class="blockList">
+<!-- ============ METHOD DETAIL ========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method.detail">
+<!--   -->
+</a>
+<h3>Method Detail</h3>
+<a name="makeObject-java.lang.Object-">
+<!--   -->
+</a><a name="makeObject-K-">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>makeObject</h4>
+<pre><a href="../../../../org/apache/commons/pool2/PooledObject.html" title="interface in org.apache.commons.pool2">PooledObject</a>&lt;<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">V</a>&gt;&nbsp;makeObject(<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">K</a>&nbsp;key)
+                    throws <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
+<div class="block">Create an instance that can be served by the pool and
+ wrap it in a <a href="../../../../org/apache/commons/pool2/PooledObject.html" title="interface in org.apache.commons.pool2"><code>PooledObject</code></a> to be managed by the pool.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>key</code> - the key used when constructing the object</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>a <code>PooledObject</code> wrapping an instance that can
+ be served by the pool.</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code> - if there is a problem creating a new instance,
+    this will be propagated to the code requesting an object.</dd>
+</dl>
+</li>
+</ul>
+<a name="destroyObject-java.lang.Object-org.apache.commons.pool2.PooledObject-">
+<!--   -->
+</a><a name="destroyObject-K-org.apache.commons.pool2.PooledObject-">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>destroyObject</h4>
+<pre>void&nbsp;destroyObject(<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">K</a>&nbsp;key,
+                   <a href="../../../../org/apache/commons/pool2/PooledObject.html" title="interface in org.apache.commons.pool2">PooledObject</a>&lt;<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">V</a>&gt;&nbsp;p)
+            throws <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
+<div class="block">Destroy an instance no longer needed by the pool.
+ <p>
+ It is important for implementations of this method to be aware that there
+ is no guarantee about what state <code>obj</code> will be in and the
+ implementation should be prepared to handle unexpected errors.
+ <p>
+ Also, an implementation must take in to consideration that instances lost
+ to the garbage collector may never be destroyed.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>key</code> - the key used when selecting the instance</dd>
+<dd><code>p</code> - a <code>PooledObject</code> wrapping the instance to be destroyed</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code> - should be avoided as it may be swallowed by
+    the pool implementation.</dd>
+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#validateObject-K-org.apache.commons.pool2.PooledObject-"><code>validateObject(K, org.apache.commons.pool2.PooledObject&lt;V&gt;)</code></a>, 
+<a href="../../../../org/apache/commons/pool2/KeyedObjectPool.html#invalidateObject-K-V-"><code>KeyedObjectPool.invalidateObject(K, V)</code></a></dd>
+</dl>
+</li>
+</ul>
+<a name="validateObject-java.lang.Object-org.apache.commons.pool2.PooledObject-">
+<!--   -->
+</a><a name="validateObject-K-org.apache.commons.pool2.PooledObject-">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>validateObject</h4>
+<pre>boolean&nbsp;validateObject(<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">K</a>&nbsp;key,
+                       <a href="../../../../org/apache/commons/pool2/PooledObject.html" title="interface in org.apache.commons.pool2">PooledObject</a>&lt;<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">V</a>&gt;&nbsp;p)</pre>
+<div class="block">Ensures that the instance is safe to be returned by the pool.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>key</code> - the key used when selecting the object</dd>
+<dd><code>p</code> - a <code>PooledObject</code> wrapping the instance to be validated</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd><code>false</code> if <code>obj</code> is not valid and should
+         be dropped from the pool, <code>true</code> otherwise.</dd>
+</dl>
+</li>
+</ul>
+<a name="activateObject-java.lang.Object-org.apache.commons.pool2.PooledObject-">
+<!--   -->
+</a><a name="activateObject-K-org.apache.commons.pool2.PooledObject-">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>activateObject</h4>
+<pre>void&nbsp;activateObject(<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">K</a>&nbsp;key,
+                    <a href="../../../../org/apache/commons/pool2/PooledObject.html" title="interface in org.apache.commons.pool2">PooledObject</a>&lt;<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">V</a>&gt;&nbsp;p)
+             throws <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
+<div class="block">Reinitialize an instance to be returned by the pool.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>key</code> - the key used when selecting the object</dd>
+<dd><code>p</code> - a <code>PooledObject</code> wrapping the instance to be activated</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code> - if there is a problem activating <code>obj</code>,
+    this exception may be swallowed by the pool.</dd>
+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#destroyObject-K-org.apache.commons.pool2.PooledObject-"><code>destroyObject(K, org.apache.commons.pool2.PooledObject&lt;V&gt;)</code></a></dd>
+</dl>
+</li>
+</ul>
+<a name="passivateObject-java.lang.Object-org.apache.commons.pool2.PooledObject-">
+<!--   -->
+</a><a name="passivateObject-K-org.apache.commons.pool2.PooledObject-">
+<!--   -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>passivateObject</h4>
+<pre>void&nbsp;passivateObject(<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">K</a>&nbsp;key,
+                     <a href="../../../../org/apache/commons/pool2/PooledObject.html" title="interface in org.apache.commons.pool2">PooledObject</a>&lt;<a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html" title="type parameter in KeyedPooledObjectFactory">V</a>&gt;&nbsp;p)
+              throws <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
+<div class="block">Uninitialize an instance to be returned to the idle object pool.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>key</code> - the key used when selecting the object</dd>
+<dd><code>p</code> - a <code>PooledObject</code> wrapping the instance to be passivated</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code> - if there is a problem passivating <code>obj</code>,
+    this exception may be swallowed by the pool.</dd>
+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a href="../../../../org/apache/commons/pool2/KeyedPooledObjectFactory.html#destroyObject-K-org.apache.commons.pool2.PooledObject-"><code>destroyObject(K, org.apache.commons.pool2.PooledObject&lt;V&gt;)</code></a></dd>
+</dl>
+</li>
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+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.commons.pool2</div>
+<h2 title="Interface ObjectPool" class="title">Interface ObjectPool&lt;T&gt;</h2>
+</div>
+<div class="contentContainer">
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt><span class="paramLabel">Type Parameters:</span></dt>
+<dd><code>T</code> - Type of element pooled in this pool.</dd>
+</dl>
+<dl>
+<dt>All Known Implementing Classes:</dt>
+<dd><a href="../../../../org/apache/commons/pool2/BaseObjectPool.html" title="class in org.apache.commons.pool2">BaseObjectPool</a>, <a href="../../../../org/apache/commons/pool2/impl/GenericObjectPool.html" title="class in org.apache.commons.pool2.impl">GenericObjectPool</a>, <a href="../../../../org/apache/commons/pool2/proxy/ProxiedObjectPool.html" title="class in org.apache.commons.pool2.proxy">ProxiedObjectPool</a>, <a href="../../../../org/apache/commons/pool2/impl/SoftReferenceObjectPool.html" title="class in org.apache.commons.pool2.impl">SoftReferenceObjectPool</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public interface <span class="typeNameLabel">ObjectPool&lt;T&gt;</span></pre>
+<div class="block">A pooling simple interface.
+ <p>
+ Example of use:
+ <pre style="border:solid thin; padding: 1ex;"
+ > Object obj = <code style="color:#00C">null</code>;
+
+ <code style="color:#00C">try</code> {
+     obj = pool.borrowObject();
+     <code style="color:#00C">try</code> {
+         <code style="color:#0C0">//...use the object...</code>
+     } <code style="color:#00C">catch</code>(Exception e) {
+         <code style="color:#0C0">// invalidate the object</code>
+         pool.invalidateObject(obj);
+         <code style="color:#0C0">// do not return the object to the pool twice</code>
+         obj = <code style="color:#00C">null</code>;
+     } <code style="color:#00C">finally</code> {
+         <code style="color:#0C0">// make sure the object is returned to the pool</code>
+         <code style="color:#00C">if</code>(<code style="color:#00C">null</code> != obj) {
+             pool.returnObject(obj);
+        }
+     }
+ } <code style="color:#00C">catch</code>(Exception e) {
+       <code style="color:#0C0">// failed to borrow an object</code>
+ }</pre>
+ <p>
+ See <a href="../../../../org/apache/commons/pool2/BaseObjectPool.html" title="class in org.apache.commons.pool2"><code>BaseObjectPool</code></a> for a simple base implementation.</div>
+<dl>
+<dt><span class="simpleTagLabel">Since:</span></dt>
+<dd>2.0</dd>
+<dt><span class="simpleTagLabel">Version:</span></dt>
+<dd>$Revision: 1566605 $</dd>
+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a href="../../../../org/apache/commons/pool2/PooledObjectFactory.html" title="interface in org.apache.commons.pool2"><code>PooledObjectFactory</code></a>, 
+<a href="../../../../org/apache/commons/pool2/KeyedObjectPool.html" title="interface in org.apache.commons.pool2"><code>KeyedObjectPool</code></a>, 
+<a href="../../../../org/apache/commons/pool2/BaseObjectPool.html" title="class in org.apache.commons.pool2"><code>BaseObjectPool</code></a></dd>
+</dl>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
+<!-- ========== METHOD SUMMARY =========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method.summary">
+<!--   -->
+</a>
+<h3>Method Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
+<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr id="i0" class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/pool2/ObjectPool.html#addObject--">addObject</a></span>()</code>
+<div class="block">Create an object using the <a href="../../../../org/apache/commons/pool2/PooledObjectFactory.html" title="interface in org.apache.commons.pool2"><code>factory</code></a> or other
+ implementation dependent mechanism, passivate it, and then place it in
+ the idle object pool.</div>
+</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code><a href="../../../../org/apache/commons/pool2/ObjectPool.html" title="type parameter in ObjectPool">T</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/pool2/ObjectPool.html#borrowObject--">borrowObject</a></span>()</code>
+<div class="block">Obtains an instance from this pool.</div>
+</td>
+</tr>
+<tr id="i2" class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/pool2/ObjectPool.html#clear--">clear</a></span>()</code>
+<div class="block">Clears any objects sitting idle in the pool, releasing any associated
+ resources (optional operation).</div>
+</td>
+</tr>
+<tr id="i3" class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/pool2/ObjectPool.html#close--">close</a></span>()</code>
+<div class="block">Close this pool, and free any resources associated with it.</div>
+</td>
+</tr>
+<tr id="i4" class="altColor">
+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/pool2/ObjectPool.html#getNumActive--">getNumActive</a></span>()</code>
+<div class="block">Return the number of instances currently borrowed from this pool.</div>
+</td>
+</tr>
+<tr id="i5" class="rowColor">
+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/pool2/ObjectPool.html#getNumIdle--">getNumIdle</a></span>()</code>
+<div class="block">Return the number of instances currently idle in this pool.</div>
+</td>
+</tr>
+<tr id="i6" class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/pool2/ObjectPool.html#invalidateObject-T-">invalidateObject</a></span>(<a href="../../../../org/apache/commons/pool2/ObjectPool.html" title="type parameter in ObjectPool">T</a>&nbsp;obj)</code>
+<div class="block">Invalidates an object from the pool.</div>
+</td>
+</tr>
+<tr id="i7" class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/pool2/ObjectPool.html#returnObject-T-">returnObject</a></span>(<a href="../../../../org/apache/commons/pool2/ObjectPool.html" title="type parameter in ObjectPool">T</a>&nbsp;obj)</code>
+<div class="block">Return an instance to the pool.</div>
+</td>
+</tr>
+</table>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="details">
+<ul class="blockList">
+<li class="blockList">
+<!-- ============ METHOD DETAIL ========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method.detail">
+<!--   -->
+</a>
+<h3>Method Detail</h3>
+<a name="borrowObject--">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>borrowObject</h4>
+<pre><a href="../../../../org/apache/commons/pool2/ObjectPool.html" title="type parameter in ObjectPool">T</a>&nbsp;borrowObject()
+        throws <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a>,
+               <a href="http://docs.oracle.com/javase/6/docs/api/java/util/NoSuchElementException.html?is-external=true" title="class or interface in java.util">NoSuchElementException</a>,
+               <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></pre>
+<div class="block">Obtains an instance from this pool.
+ <p>
+ Instances returned from this method will have been either newly created
+ with <a href="../../../../org/apache/commons/pool2/PooledObjectFactory.html#makeObject--"><code>PooledObjectFactory.makeObject()</code></a> or will be a previously
+ idle object and have been activated with
+ <a href="../../../../org/apache/commons/pool2/PooledObjectFactory.html#activateObject-org.apache.commons.pool2.PooledObject-"><code>PooledObjectFactory.activateObject(org.apache.commons.pool2.PooledObject&lt;T&gt;)</code></a> and then validated with
+ <a href="../../../../org/apache/commons/pool2/PooledObjectFactory.html#validateObject-org.apache.commons.pool2.PooledObject-"><code>PooledObjectFactory.validateObject(org.apache.commons.pool2.PooledObject&lt;T&gt;)</code></a>.
+ <p>
+ By contract, clients <strong>must</strong> return the borrowed instance
+ using <a href="../../../../org/apache/commons/pool2/ObjectPool.html#returnObject-T-"><code>returnObject(T)</code></a>, <a href="../../../../org/apache/commons/pool2/ObjectPool.html#invalidateObject-T-"><code>invalidateObject(T)</code></a>, or a related
+ method as defined in an implementation or sub-interface.
+ <p>
+ The behaviour of this method when the pool has been exhausted
+ is not strictly specified (although it may be specified by
+ implementations).</div>
+<dl>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>an instance from this pool.</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - after <a href="../../../../org/apache/commons/pool2/ObjectPool.html#close--"><code>close</code></a> has been called on this pool.</dd>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code> - when <a href="../../../../org/apache/commons/pool2/PooledObjectFactory.html#makeObject--"><code>PooledObjectFactory.makeObject()</code></a> throws an
+              exception.</dd>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/NoSuchElementException.html?is-external=true" title="class or interface in java.util">NoSuchElementException</a></code> - when the pool is exhausted and cannot or will not return
+              another instance.</dd>
+</dl>
+</li>
+</ul>
+<a name="returnObject-java.lang.Object-">
+<!--   -->
+</a><a name="returnObject-T-">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>returnObject</h4>
+<pre>void&nbsp;returnObject(<a href="../../../../org/apache/commons/pool2/ObjectPool.html" title="type parameter in ObjectPool">T</a>&nbsp;obj)
+           throws <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
+<div class="block">Return an instance to the pool. By contract, <code>obj</code>
+ <strong>must</strong> have been obtained using <a href="../../../../org/apache/commons/pool2/ObjectPool.html#borrowObject--"><code>borrowObject()</code></a> or
+ a related method as defined in an implementation or sub-interface.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>obj</code> - a <a href="../../../../org/apache/commons/pool2/ObjectPool.html#borrowObject--"><code>borrowed</code></a> instance to be returned.</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if an attempt is made to return an object to the pool that
+              is in any state other than allocated (i.e. borrowed).
+              Attempting to return an object more than once or attempting
+              to return an object that was never borrowed from the pool
+              will trigger this exception.</dd>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code> - if an instance cannot be returned to the pool</dd>
+</dl>
+</li>
+</ul>
+<a name="invalidateObject-java.lang.Object-">
+<!--   -->
+</a><a name="invalidateObject-T-">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>invalidateObject</h4>
+<pre>void&nbsp;invalidateObject(<a href="../../../../org/apache/commons/pool2/ObjectPool.html" title="type parameter in ObjectPool">T</a>&nbsp;obj)
+               throws <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
+<div class="block">Invalidates an object from the pool.
+ <p>
+ By contract, <code>obj</code> <strong>must</strong> have been obtained
+ using <a href="../../../../org/apache/commons/pool2/ObjectPool.html#borrowObject--"><code>borrowObject()</code></a> or a related method as defined in an
+ implementation or sub-interface.
+ <p>
+ This method should be used when an object that has been borrowed is
+ determined (due to an exception or other problem) to be invalid.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>obj</code> - a <a href="../../../../org/apache/commons/pool2/ObjectPool.html#borrowObject--"><code>borrowed</code></a> instance to be disposed.</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code> - if the instance cannot be invalidated</dd>
+</dl>
+</li>
+</ul>
+<a name="addObject--">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>addObject</h4>
+<pre>void&nbsp;addObject()
+        throws <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a>,
+               <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a>,
+               <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang">UnsupportedOperationException</a></pre>
+<div class="block">Create an object using the <a href="../../../../org/apache/commons/pool2/PooledObjectFactory.html" title="interface in org.apache.commons.pool2"><code>factory</code></a> or other
+ implementation dependent mechanism, passivate it, and then place it in
+ the idle object pool. <code>addObject</code> is useful for "pre-loading"
+ a pool with idle objects. (Optional operation).</div>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code> - when <a href="../../../../org/apache/commons/pool2/PooledObjectFactory.html#makeObject--"><code>PooledObjectFactory.makeObject()</code></a> fails.</dd>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - after <a href="../../../../org/apache/commons/pool2/ObjectPool.html#close--"><code>close()</code></a> has been called on this pool.</dd>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang">UnsupportedOperationException</a></code> - when this pool cannot add new idle objects.</dd>
+</dl>
+</li>
+</ul>
+<a name="getNumIdle--">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>getNumIdle</h4>
+<pre>int&nbsp;getNumIdle()</pre>
+<div class="block">Return the number of instances currently idle in this pool. This may be
+ considered an approximation of the number of objects that can be
+ <a href="../../../../org/apache/commons/pool2/ObjectPool.html#borrowObject--"><code>borrowed</code></a> without creating any new instances.
+ Returns a negative value if this information is not available.</div>
+<dl>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>the number of instances currently idle in this pool.</dd>
+</dl>
+</li>
+</ul>
+<a name="getNumActive--">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>getNumActive</h4>
+<pre>int&nbsp;getNumActive()</pre>
+<div class="block">Return the number of instances currently borrowed from this pool. Returns
+ a negative value if this information is not available.</div>
+<dl>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>the number of instances currently borrowed from this pool.</dd>
+</dl>
+</li>
+</ul>
+<a name="clear--">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>clear</h4>
+<pre>void&nbsp;clear()
+    throws <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a>,
+           <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang">UnsupportedOperationException</a></pre>
+<div class="block">Clears any objects sitting idle in the pool, releasing any associated
+ resources (optional operation). Idle objects cleared must be
+ <a href="../../../../org/apache/commons/pool2/PooledObjectFactory.html#destroyObject-org.apache.commons.pool2.PooledObject-"><code>PooledObjectFactory.destroyObject(PooledObject)</code></a>.</div>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang">UnsupportedOperationException</a></code> - if this implementation does not support the operation</dd>
+<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code> - if the pool cannot be cleared</dd>
+</dl>
+</li>
+</ul>
+<a name="close--">
+<!--   -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>close</h4>
+<pre>void&nbsp;close()</pre>
+<div class="block">Close this pool, and free any resources associated with it.
+ <p>
+ Calling <a href="../../../../org/apache/commons/pool2/ObjectPool.html#addObject--"><code>addObject()</code></a> or <a href="../../../../org/apache/commons/pool2/ObjectPool.html#borrowObject--"><code>borrowObject()</code></a> after invoking this
+ method on a pool will cause them to throw an <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang"><code>IllegalStateException</code></a>.
+ <p>
+ Implementations should silently fail if not all resources can be freed.</div>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
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+<!-- ========= END OF CLASS DATA ========= -->
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