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From conflue...@apache.org
Subject [CONF] Apache Ode: Activity Failure and Recovery (page edited)
Date Wed, 09 May 2007 21:16:00 GMT
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</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/ODExSITE">ODExSITE</a>
:
            <a href="http://cwiki.apache.org/confluence/display/ODExSITE/Activity+Failure+and+Recovery">Activity
Failure and Recovery</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/ODExSITE/Activity+Failure+and+Recovery">Activity
Failure and Recovery</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~boisvert">Alex
Boisvert</a>
            <span class="smallfont">(May 09, 2007)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=46741&originalVersion=1&revisedVersion=2">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h1><a name="ActivityFailureandRecovery-ActivityFailureandRecovery"></a>Activity
Failure and Recovery</h1>
<p>There are several types of error conditions. In this document we introduce a class
of error condition called <em>failures</em>, distinct from <em>faults</em>,
and describe how failures are caught and handled by the process engine.</p>

<p>A service returns a fault in response to a request it cannot process. A process may
also raise a fault internally when it encounters a terminal error condition, e.g. a faulty
expression or false join condition. In addition, processes may raise faults in order to terminate
normal processing.</p>

<p>In contrast, failures are non-terminal error conditions that do not affect the normal
flow of the process. We keep the process definition simple and straightforward by delegating
failure handling to the process engine and administrator.</p>

<p>For example, when the process is unable to perform DNS resolution to determine the
service endpoint, it generates a failure. An administrator can fix the DNS server and tell
the process engine to retry the activity. Had the DNS error been reported as a fault, the
process would either terminate or require complex fault handling and recovery logic to proceed
past this point of failure.</p>

<p>In short, failures shields the process from common, non-terminal error conditions
while retaining simple and straightforward process definitions that do not need to account
for these error conditions.</p>

<h2><a name="ActivityFailureandRecovery-FromFailuretoRecovery"></a>From
Failure to Recovery</h2>
<p>Currently, the <em>Invoke</em> activity is the only activity that supports
failure handling and recovery. The mechanism is identical for all other activities that may
support failure handling and recovery in the future.</p>

<p>In case of the <em>Invoke</em> activity, a failure condition is triggered
by the integration layer, in lieu of a response or fault message. The <em>Invoke</em>
activity consults its failure handling policy (specified here) and decides how to respond.</p>

<p>Set <em>faultOnFailure</em> to <em>yes</em>, if you want
the activity to throw a fault on failure. All other failure handling settings are ignored.
The activity will throw the <em>activityFailure</em> fault.</p>

<p>The <em>activityFailure</em> fault is a standard fault, so you can use
the <em>exitOnStandardFault</em> attribute to control whether the process exits
immediately, or throws a fault in the enclosing scope.</p>

<p>Set <em>retryFor</em> to a positive integer if you want the activity
to attempt self-recovery and retry up to that number of times. Set <em>retryDelay</em>
to a reasonable time delay (specified in seconds) between retries. For example, if you set
<em>retryFor=2, retryDelay=30</em>, the activity will retry after 30 and 60 seconds,
for a total of three attempts, before entering activity recovery mode.</p>

<p>If the activity retries and succeeds, it will complete successfully as if no failure
occurred. Of course, the activity may retry and fault, e.g. if the invoked service returns
a fault. If the activity has exhausted all retry attempts, it enters activity recovery mode.
By default <em>retryFor</em> is zero, and the activity enters recovery mode after
the first failure.</p>

<p>When in recovery mode, you can recover the activity in one of three ways:</p>
<ul>
	<li><b>Retry</b> &#45;&#45; Retry the activity manually. You can
repeat this any number of times until the activity completes or faults.</li>
	<li><b>Fault</b> &#45;&#45; Causes the activity to throw the <em>activityFailure</em>
fault.</li>
	<li><b>Cancel</b> &#45;&#45; Cancels the activity. The activity
completes unsuccessfully: without changing the state of variables, by setting the status of
all its source links to false, and without installing a compensation handler.<br/>
Activity recovery is performed individually for each activity instance, and does not affect
other activities executing in the same process. While the activity is in the <em>FAILURE</em>
state, the process instance remains in the <em>ACTIVE</em> state and may execute
other activities from parallel flows and event handlers.</li>
</ul>


<h2><a name="ActivityFailureandRecovery-SpecifyingFailureBehavior"></a>Specifying
Failure Behavior</h2>
<p>Use the <em>failureHandling</em> extensibility element defined in the
namespace <tt><span class="nobr"><a href="http://ode.apache.org/activityRecovery"
title="Visit page outside Confluence" rel="nofollow">http://ode.apache.org/activityRecovery<sup><img
class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span></tt>. The structure of the
<em>failureHandling</em> element is:</p>

<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;ext:failureHandling <span
class="code-keyword">xmlns:ext</span>=<span class="code-quote">"http://ode.apache.org/activityRecovery"</span>&gt;</span>
    <span class="code-tag">&lt;ext:faultOnFailure&gt;</span> _boolean_
<span class="code-tag">&lt;/ext:faultOnFailure&gt;</span>
    <span class="code-tag">&lt;ext:retryFor&gt;</span> _integer_ <span
class="code-tag">&lt;/ext:retryFor&gt;</span>
    <span class="code-tag">&lt;ext:retryDelay&gt;</span> _integer_ <span
class="code-tag">&lt;/ext:retryDelay&gt;</span>
<span class="code-tag">&lt;/ext:failureHandling&gt;</span></pre>
</div></div>

<p>The <em>faultOnFailure</em>, <em>retryFor</em> and <em>retryDelay</em>
elements are optional. The default values are false for <em>faultOnFailure</em>,
and zero for <em>retryFor</em> and <em>retryDelay</em>.</p>

<p>An activity that does not specify failure handling using this extensibility element,
inherits the failure handling policy of its parent activity, recursively up to the top-level
activity of the process. You can useinheritence to specify the failure handling policy of
a set of activities, or all activities in the process, using a single <em>failureHandling</em>
extensibility element.</p>

<p>Note that due to this behavior, if activity <em>S</em> specifies failure
handling with the values <em>retryFor=2, retryDelay=60</em>, and has a child activity
<em>R</em> that specifies failure handling with the values <em>retryFor=3</em>,
the <em>retryDelay</em> value for the child activity <em>R</em> is
0, and not 60. Using the <em>failureHandling</em> element without specifying one
of its value elements will apply the default value for that element.</p>

<h2><a name="ActivityFailureandRecovery-Examples"></a>Examples</h2>

<p>A simple invoke with the <tt>ext:failureHandling</tt> extension:</p>

<div class="code"><div class="codeContent">
<pre class="code-xml">&lt;bpel:invoke inputVariable=<span class="code-quote">"myRequest"</span>
    operation=<span class="code-quote">"foo"</span> outputVariable=<span class="code-quote">"aResponse"</span>
    partnerLink=<span class="code-quote">"myPartner"</span> portType=<span
class="code-quote">"spt:SomePortType"</span>&gt;

    <span class="code-tag">&lt;ext:failureHandling <span class="code-keyword">xmlns:ext</span>=<span
class="code-quote">"http://ode.apache.org/activityRecovery"</span>&gt;</span>
        <span class="code-tag">&lt;ext:faultOnFailure&gt;</span>false<span
class="code-tag">&lt;/ext:faultOnFailure&gt;</span>
        <span class="code-tag">&lt;ext:retryFor&gt;</span>2<span class="code-tag">&lt;/ext:retryFor&gt;</span>
        <span class="code-tag">&lt;ext:retryDelay&gt;</span>60<span
class="code-tag">&lt;/ext:retryDelay&gt;</span>
    <span class="code-tag">&lt;/ext:failureHandling&gt;</span>

<span class="code-tag">&lt;/bpel:invoke&gt;</span></pre>
</div></div>

<p>And a sequence activity that converts failures into faults:</p>

<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;bpel:sequence&gt;</span>

    <span class="code-tag">&lt;ext:failureHandling <span class="code-keyword">xmlns:ext</span>=<span
class="code-quote">"http://ode.apache.org/activityRecovery"</span>&gt;</span>
        <span class="code-tag">&lt;ext:faultOnFailure&gt;</span>true<span
class="code-tag">&lt;/ext:faultOnFailure&gt;</span>
        <span class="code-tag">&lt;ext:retryFor&gt;</span>2<span class="code-tag">&lt;/ext:retryFor&gt;</span>
        <span class="code-tag">&lt;ext:retryDelay&gt;</span>60<span
class="code-tag">&lt;/ext:retryDelay&gt;</span>
    <span class="code-tag">&lt;/ext:failureHandling&gt;</span>

    <span class="code-tag">&lt;bpel:faultHandlers&gt;</span>
        ...
    <span class="code-tag">&lt;/bpel:faultHandlers&gt;</span>

    ...

    &lt;bpel:invoke inputVariable=<span class="code-quote">"myRequest"</span>
        operation=<span class="code-quote">"foo"</span> outputVariable=<span
class="code-quote">"aResponse"</span>
        partnerLink=<span class="code-quote">"myPartner"</span> portType=<span
class="code-quote">"spt:SomePortType"</span> /&gt;

    ...

<span class="code-tag">&lt;/bpel:sequence&gt;</span></pre>
</div></div>


<h2><a name="ActivityFailureandRecovery-ProcessInstanceManagement"></a>Process
Instance Management</h2>
<p>The process instance management provides the following information:</p>
<ul>
	<li>Process instance summary includes a <em>failures</em> element with
a count of the total number of process instances that have one or more activities in recovery
mode, and the date/time of the last activity to enter recovery mode. The element exists if
at least one activity is in recovery mode.</li>
	<li>Process instance information includes a <em>failures</em> element with
a count of the number of activities in recovery mode, and the date/time of the last activity
to enter recovery mode. The element exists if at least one activity is in recovery mode.</li>
	<li>Activity instance information includes a <em>failure</em> element that
specifies the date/time of the failure, the reason for the failure, number of retries, and
list of available recovery actions. The element exists if the activity is in the state <em>FAILURE</em>.</li>
</ul>


<p>Use the <em>recoverActivity</em> operation to perform a recovery action
on an activity in recovery mode. The operation requires the process instance ID, the activity
instance ID and the recovery action to perform (one of retry, fault or cancel).</p>

<p>You can also determine when failure or recovery occurred for a given activity instance
from the execution log.</p></div>


</td></tr></table></div>
<p>
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