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<div class="subTitle">org.apache.ignite.compute</div>
<h2 title="Class ComputeJobContinuationAdapter" class="title">Class ComputeJobContinuationAdapter</h2>
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<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../../org/apache/ignite/compute/ComputeJobAdapter.html" title="class in org.apache.ignite.compute">org.apache.ignite.compute.ComputeJobAdapter</a></li>
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<ul class="inheritance">
<li>org.apache.ignite.compute.ComputeJobContinuationAdapter</li>
</ul>
</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Callable.html?is-external=true" title="class or interface in java.util.concurrent">Callable</a>&lt;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&gt;, <a href="../../../../org/apache/ignite/compute/ComputeJob.html" title="interface in org.apache.ignite.compute">ComputeJob</a>, <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html" title="interface in org.apache.ignite.compute">ComputeJobContinuation</a></dd>
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<hr>
<br>
<pre>public abstract class <span class="strong">ComputeJobContinuationAdapter</span>
extends <a href="../../../../org/apache/ignite/compute/ComputeJobAdapter.html" title="class in org.apache.ignite.compute">ComputeJobAdapter</a>
implements <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html" title="interface in org.apache.ignite.compute">ComputeJobContinuation</a></pre>
<div class="block">Convenience adapter for <a href="../../../../org/apache/ignite/compute/ComputeJob.html" title="interface in org.apache.ignite.compute"><code>ComputeJob</code></a> implementations. It provides the
following functionality:
<ul>
<li>
Default implementation of <a href="../../../../org/apache/ignite/compute/ComputeJob.html#cancel()"><code>ComputeJob.cancel()</code></a> method and ability
to check whether cancellation occurred.
</li>
<li>
Ability to set and get a job arguments via <a href="../../../../org/apache/ignite/compute/ComputeJobAdapter.html#setArguments(java.lang.Object...)"><code>ComputeJobAdapter.setArguments(Object...)</code></a>
and <a href="../../../../org/apache/ignite/compute/ComputeJobAdapter.html#argument(int)"><code>ComputeJobAdapter.argument(int)</code></a> methods.
</li>
</ul>
Here is an example of how <code>ComputeJobAdapter</code> can be used from task logic
to create jobs. The example creates job adapter as anonymous class, but you
are free to create a separate class for it.
<pre name="code" class="java">
public class TestGridTask extends ComputeTaskSplitAdapter&lt;String, Integer&gt; {
// Used to imitate some logic for the
// sake of this example
private int multiplier = 3;
&#64;Override
protected Collection&lt;? extends ComputeJob&gt; split(int gridSize, final String arg) throws IgniteCheckedException {
List&lt;ComputeJobAdapter&lt;String&gt;&gt; jobs = new ArrayList&lt;ComputeJobAdapter&lt;String&gt;&gt;(gridSize);
for (int i = 0; i < gridSize; i++) {
jobs.add(new ComputeJobAdapter() {
// Job execution logic.
public Object execute() throws IgniteCheckedException {
return multiplier * arg.length();
}
});
}
return jobs;
}
// Aggregate multiple job results into
// one task result.
public Integer reduce(List&lt;ComputeJobResult&gt; results) throws IgniteCheckedException {
int sum = 0;
// For the sake of this example, let's sum all results.
for (ComputeJobResult res : results) {
sum += (Integer)res.getData();
}
return sum;
}
}
</pre></div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../serialized-form.html#org.apache.ignite.compute.ComputeJobContinuationAdapter">Serialized Form</a></dd></dl>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier</th>
<th class="colLast" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeJobContinuationAdapter.html#ComputeJobContinuationAdapter()">ComputeJobContinuationAdapter</a></strong>()</code>
<div class="block">No-arg constructor.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeJobContinuationAdapter.html#ComputeJobContinuationAdapter(java.lang.Object...)">ComputeJobContinuationAdapter</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>...&nbsp;args)</code>
<div class="block">Creates job with specified arguments.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeJobContinuationAdapter.html#ComputeJobContinuationAdapter(java.lang.Object)">ComputeJobContinuationAdapter</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;arg)</code>
<div class="block">Creates job with one arguments.</div>
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<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeJobContinuationAdapter.html#callcc()">callcc</a></strong>()</code>
<div class="block">Resumes job if it was held by <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#holdcc()"><code>ComputeJobContinuation.holdcc()</code></a> method.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeJobContinuationAdapter.html#heldcc()">heldcc</a></strong>()</code>
<div class="block">Checks if job execution has been temporarily held (suspended).</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>&lt;T&gt;&nbsp;T</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeJobContinuationAdapter.html#holdcc()">holdcc</a></strong>()</code>
<div class="block">Holds (suspends) a given job indefinitely until <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#callcc()"><code>ComputeJobContinuation.callcc()</code></a> is called.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>&lt;T&gt;&nbsp;T</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeJobContinuationAdapter.html#holdcc(long)">holdcc</a></strong>(long&nbsp;timeout)</code>
<div class="block">Holds (suspends) a given job for specified timeout or until <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#callcc()"><code>ComputeJobContinuation.callcc()</code></a> is called.</div>
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<h3>Methods inherited from class&nbsp;org.apache.ignite.compute.<a href="../../../../org/apache/ignite/compute/ComputeJobAdapter.html" title="class in org.apache.ignite.compute">ComputeJobAdapter</a></h3>
<code><a href="../../../../org/apache/ignite/compute/ComputeJobAdapter.html#argument(int)">argument</a>, <a href="../../../../org/apache/ignite/compute/ComputeJobAdapter.html#call()">call</a>, <a href="../../../../org/apache/ignite/compute/ComputeJobAdapter.html#cancel()">cancel</a>, <a href="../../../../org/apache/ignite/compute/ComputeJobAdapter.html#isCancelled()">isCancelled</a>, <a href="../../../../org/apache/ignite/compute/ComputeJobAdapter.html#setArguments(java.lang.Object...)">setArguments</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li>
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<h3>Methods inherited from interface&nbsp;org.apache.ignite.compute.<a href="../../../../org/apache/ignite/compute/ComputeJob.html" title="interface in org.apache.ignite.compute">ComputeJob</a></h3>
<code><a href="../../../../org/apache/ignite/compute/ComputeJob.html#execute()">execute</a></code></li>
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<h3>Constructor Detail</h3>
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<h4>ComputeJobContinuationAdapter</h4>
<pre>protected&nbsp;ComputeJobContinuationAdapter()</pre>
<div class="block">No-arg constructor.</div>
</li>
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<h4>ComputeJobContinuationAdapter</h4>
<pre>protected&nbsp;ComputeJobContinuationAdapter(@Nullable
<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;arg)</pre>
<div class="block">Creates job with one arguments. This constructor exists for better
backward compatibility with internal Ignite 2.x code.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>arg</code> - Job argument.</dd></dl>
</li>
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<a name="ComputeJobContinuationAdapter(java.lang.Object...)">
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<h4>ComputeJobContinuationAdapter</h4>
<pre>protected&nbsp;ComputeJobContinuationAdapter(@Nullable
<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>...&nbsp;args)</pre>
<div class="block">Creates job with specified arguments.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>args</code> - Optional job arguments.</dd></dl>
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<h4>heldcc</h4>
<pre>public&nbsp;boolean&nbsp;heldcc()</pre>
<div class="block">Checks if job execution has been temporarily held (suspended).
<p>
If job has completed its execution, then <code>false</code> is always returned.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#heldcc()">heldcc</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html" title="interface in org.apache.ignite.compute">ComputeJobContinuation</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd><code>True</code> if job has been held.</dd></dl>
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<a name="callcc()">
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<h4>callcc</h4>
<pre>public&nbsp;void&nbsp;callcc()</pre>
<div class="block">Resumes job if it was held by <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#holdcc()"><code>ComputeJobContinuation.holdcc()</code></a> method. Resuming job means that
<a href="../../../../org/apache/ignite/compute/ComputeJob.html#execute()"><code>ComputeJob.execute()</code></a> method will be called again. It is user's responsibility to check,
as needed, whether job is executing from scratch and has been resumed.
<p>
Note that the job is resumed with exactly the same state as of when it was <i>'held'</i> via
the <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#holdcc()"><code>ComputeJobContinuation.holdcc()</code></a> method.
<p>
If job is not running, has not been suspended, or has completed its execution, then no-op.
<p>
The method is named after <code>'call-with-current-continuation'</code> design pattern, commonly
abbreviated as <code>'call/cc'</code>, which originated in Scheme programming language.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#callcc()">callcc</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html" title="interface in org.apache.ignite.compute">ComputeJobContinuation</a></code></dd>
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<h4>holdcc</h4>
<pre>@Nullable
public&nbsp;&lt;T&gt;&nbsp;T&nbsp;holdcc()</pre>
<div class="block">Holds (suspends) a given job indefinitely until <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#callcc()"><code>ComputeJobContinuation.callcc()</code></a> is called.
Job will remain in active queue, but its <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#heldcc()"><code>ComputeJobContinuation.heldcc()</code></a> method will
return <code>true</code>. Implementations of <a href="../../../../org/apache/ignite/spi/collision/CollisionSpi.html" title="interface in org.apache.ignite.spi.collision"><code>CollisionSpi</code></a> should check
if jobs are held or not as needed.
<p>
All jobs should stop their execution and return right after calling
<code>'holdcc(..)'</code> method. For convenience, this method always returns <code>null</code>,
so you can hold and return in one line by calling <code>'return holdcc()'</code> method.
<p>
If job is not running or has completed its execution, then no-op.
<p>
The <code>'cc'</code> suffix stands for <code>'current-continuation'</code> which is a
pretty standard notation for this concept that originated from Scheme programming
language. Basically, the job is held to be continued later, hence the name of the method.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#holdcc()">holdcc</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html" title="interface in org.apache.ignite.compute">ComputeJobContinuation</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>Always returns <code>null</code> for convenience to be used in code with return statement.</dd></dl>
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<h4>holdcc</h4>
<pre>@Nullable
public&nbsp;&lt;T&gt;&nbsp;T&nbsp;holdcc(long&nbsp;timeout)</pre>
<div class="block">Holds (suspends) a given job for specified timeout or until <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#callcc()"><code>ComputeJobContinuation.callcc()</code></a> is called.
Holds (suspends) a given job for specified timeout or until <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#callcc()"><code>ComputeJobContinuation.callcc()</code></a> is called.
Job will remain in active queue, but its <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#heldcc()"><code>ComputeJobContinuation.heldcc()</code></a> method will
return <code>true</code>. Implementations of <a href="../../../../org/apache/ignite/spi/collision/CollisionSpi.html" title="interface in org.apache.ignite.spi.collision"><code>CollisionSpi</code></a> should check
if jobs are held or not as needed.
<p>
All jobs should stop their execution and return right after calling
<code>'holdcc(..)'</code> method. For convenience, this method always returns <code>null</code>,
so you can hold and return in one line by calling <code>'return holdcc()'</code>.
<p>
If job is not running or has completed its execution, then no-op.
<p>
The <code>'cc'</code> suffix stands for <code>'current-continuation'</code> which is a
fairly standard notation for this concept. Basically, the job is <i>held</i> to
be continued later, hence the name of the method.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#holdcc(long)">holdcc</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html" title="interface in org.apache.ignite.compute">ComputeJobContinuation</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>timeout</code> - Timeout in milliseconds after which job will be automatically resumed.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Always returns <code>null</code> for convenience to be used in code with return statement.</dd></dl>
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<p class="legalCopy"><small><table width="100%" border="0" cellspacing=0 cellpadding=0 style="padding: 5px"> <tr> <td> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <a target=_blank href="https://ignite.apache.org"><nobr>2015 Copyright &#169; Apache Software Foundation</nobr></a> </td> </tr> </tbody> </table> </td> <td width="100%" align="right" valign="center"> <a href="https://twitter.com/ApacheIgnite" class="twitter-follow-button" data-show-count="false" data-size="large">Follow @ApacheIgnite</a> <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> </td> </tr> <tr> <td colspan="2" valign="top" align="left"> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <b>Ignite Fabric</b> </td> <td>:&nbsp;&nbsp; ver. <strong>1.7.0</strong> </td> </tr> <tr style="padding: 0; margin: 0"> <td> <b>Release Date</b> </td> <td>:&nbsp;&nbsp; August 1 2016 </td> </tr> </tbody> </table> </td> </tr> </table></small></p>
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