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| <div class="subTitle">org.apache.ignite.compute</div>
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| <h2 title="Class ComputeJobContinuationAdapter" class="title">Class ComputeJobContinuationAdapter</h2>
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|
| <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>GridComputeJobAdapter</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 GridComputeTaskSplitAdapter<String, Integer> { |
| // Used to imitate some logic for the |
| // sake of this example |
| private int multiplier = 3; |
| |
| @Override |
| protected Collection<? extends ComputeJob> split(int gridSize, final String arg) throws IgniteCheckedException { |
| List<GridComputeJobAdapter<String>> jobs = new ArrayList<GridComputeJobAdapter<String>>(gridSize); |
| |
| for (int i = 0; i < gridSize; i++) { |
| jobs.add(new GridComputeJobAdapter() { |
| // 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<GridComputeJobResult> results) throws IgniteCheckedException { |
| int sum = 0; |
| |
| // For the sake of this example, let's sum all results. |
| for (GridComputeJobResult 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"> </span></caption>
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| <tr>
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| <th class="colFirst" scope="col">Modifier</th>
|
| <th class="colLast" scope="col">Constructor and Description</th>
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| <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>... 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> arg)</code>
|
| <div class="block">Creates job with one arguments.</div>
|
| </td>
|
| </tr>
|
| </table>
|
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|
| <caption><span>Methods</span><span class="tabEnd"> </span></caption>
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| <tr>
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| <th class="colFirst" scope="col">Modifier and Type</th>
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| <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><T> 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">
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| <td class="colFirst"><code><T> T</code></td>
|
| <td class="colLast"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeJobContinuationAdapter.html#holdcc(long)">holdcc</a></strong>(long 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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|
| <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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|
| <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 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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| </ul>
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| </li>
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| <h3>Constructor Detail</h3>
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| <a name="ComputeJobContinuationAdapter()">
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| <pre>protected ComputeJobContinuationAdapter()</pre>
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| <div class="block">No-arg constructor.</div>
|
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| <h4>ComputeJobContinuationAdapter</h4>
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| <pre>protected 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> 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>
|
| </ul>
|
| <a name="ComputeJobContinuationAdapter(java.lang.Object...)">
|
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| </a>
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| <h4>ComputeJobContinuationAdapter</h4>
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| <pre>protected 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>... 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>
|
| </li>
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| </ul>
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| <a name="heldcc()">
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| <h4>heldcc</h4>
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| <pre>public boolean 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> in interface <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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| <h4>callcc</h4>
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| <pre>public void 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> in interface <code><a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html" title="interface in org.apache.ignite.compute">ComputeJobContinuation</a></code></dd>
|
| </dl>
|
| </li>
|
| </ul>
|
| <a name="holdcc()">
|
| <!-- -->
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| </a>
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| <ul class="blockList">
|
| <li class="blockList">
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| <h4>holdcc</h4>
|
| <pre>@Nullable
|
| public <span class='angle_bracket'><</span>T<span class='angle_bracket'>></span> T 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> in interface <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>
|
| </li>
|
| </ul>
|
| <a name="holdcc(long)">
|
| <!-- -->
|
| </a>
|
| <ul class="blockListLast">
|
| <li class="blockList">
|
| <h4>holdcc</h4>
|
| <pre>@Nullable
|
| public <span class='angle_bracket'><</span>T<span class='angle_bracket'>></span> T holdcc(long 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> in interface <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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