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| <h2 title="Interface ComputeJobContinuation" class="title">Interface ComputeJobContinuation</h2> |
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| <pre>public interface <span class="strong">ComputeJobContinuation</span></pre> |
| <div class="block">Defines continuation support for grid job context.</div> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.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>holdcc()</code></a> method.</div> |
| </td> |
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| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#heldcc()">heldcc</a></strong>()</code> |
| <div class="block">Checks if job execution has been temporarily held (suspended).</div> |
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| <td class="colFirst"><code><T> T</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.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>callcc()</code></a> is called.</div> |
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| <td class="colFirst"><code><T> T</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.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>callcc()</code></a> is called.</div> |
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| <h4>heldcc</h4> |
| <pre>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><span class="strong">Returns:</span></dt><dd><code>True</code> if job has been held.</dd></dl> |
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| <h4>holdcc</h4> |
| <pre>@Nullable |
| <T> T holdcc()</pre> |
| <div class="block">Holds (suspends) a given job indefinitely until <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#callcc()"><code>callcc()</code></a> is called. |
| Job will remain in active queue, but its <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#heldcc()"><code>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><span class="strong">Returns:</span></dt><dd>Always returns <code>null</code> for convenience to be used in code with return statement.</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - If job has been already held before.</dd></dl> |
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| <h4>holdcc</h4> |
| <pre>@Nullable |
| <T> 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>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>callcc()</code></a> is called. |
| Job will remain in active queue, but its <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#heldcc()"><code>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><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> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - If job has been already held before</dd></dl> |
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| <h4>callcc</h4> |
| <pre>void callcc()</pre> |
| <div class="block">Resumes job if it was held by <a href="../../../../org/apache/ignite/compute/ComputeJobContinuation.html#holdcc()"><code>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>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> |
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