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| <h2 title="Class ComputeTaskAdapter" class="title">Class ComputeTaskAdapter<T,R></h2> |
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| <li>org.apache.ignite.compute.ComputeTaskAdapter<T,R></li> |
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| <dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - Type of the task argument.</dd><dd><code>R</code> - Type of the task result returning from <a href="../../../../org/apache/ignite/compute/ComputeTask.html#reduce(java.util.List)"><code>ComputeTask.reduce(List)</code></a> method.</dd></dl> |
| <dl> |
| <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="../../../../org/apache/ignite/compute/ComputeTask.html" title="interface in org.apache.ignite.compute">ComputeTask</a><T,R></dd> |
| </dl> |
| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../org/apache/ignite/compute/ComputeTaskSplitAdapter.html" title="class in org.apache.ignite.compute">ComputeTaskSplitAdapter</a>, <a href="../../../../org/apache/ignite/compute/gridify/aop/GridifyDefaultRangeTask.html" title="class in org.apache.ignite.compute.gridify.aop">GridifyDefaultRangeTask</a>, <a href="../../../../org/apache/ignite/compute/gridify/aop/GridifyDefaultTask.html" title="class in org.apache.ignite.compute.gridify.aop">GridifyDefaultTask</a>, <a href="../../../../org/apache/ignite/compute/gridify/GridifyTaskAdapter.html" title="class in org.apache.ignite.compute.gridify">GridifyTaskAdapter</a>, <a href="../../../../org/apache/ignite/igfs/mapreduce/IgfsTask.html" title="class in org.apache.ignite.igfs.mapreduce">IgfsTask</a></dd> |
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| <pre>public abstract class <span class="strong">ComputeTaskAdapter<T,R></span> |
| extends <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> |
| implements <a href="../../../../org/apache/ignite/compute/ComputeTask.html" title="interface in org.apache.ignite.compute">ComputeTask</a><T,R></pre> |
| <div class="block">Convenience adapter for <a href="../../../../org/apache/ignite/compute/ComputeTask.html" title="interface in org.apache.ignite.compute"><code>ComputeTask</code></a> interface. Here is an example of |
| how <code>ComputeTaskAdapter</code> can be used: |
| <pre name="code" class="java"> |
| public class MyFooBarTask extends ComputeTaskAdapter<String, String> { |
| // Inject load balancer. |
| @LoadBalancerResource |
| ComputeLoadBalancer balancer; |
| |
| // Map jobs to grid nodes. |
| public Map<? extends ComputeJob, ClusterNode> map(List<ClusterNode> subgrid, String arg) throws IgniteCheckedException { |
| Map<MyFooBarJob, ClusterNode> jobs = new HashMap<MyFooBarJob, ClusterNode>(subgrid.size()); |
| |
| // In more complex cases, you can actually do |
| // more complicated assignments of jobs to nodes. |
| for (int i = 0; i < subgrid.size(); i++) { |
| // Pick the next best balanced node for the job. |
| jobs.put(new MyFooBarJob(arg), balancer.getBalancedNode()) |
| } |
| |
| return jobs; |
| } |
| |
| // Aggregate results into one compound result. |
| public String reduce(List<ComputeJobResult> results) throws IgniteCheckedException { |
| // For the purpose of this example we simply |
| // concatenate string representation of every |
| // job result |
| StringBuilder buf = new StringBuilder(); |
| |
| for (ComputeJobResult res : results) { |
| // Append string representation of result |
| // returned by every job. |
| buf.append(res.getData().string()); |
| } |
| |
| return buf.string(); |
| } |
| } |
| </pre> |
| For more information refer to <a href="../../../../org/apache/ignite/compute/ComputeTask.html" title="interface in org.apache.ignite.compute"><code>ComputeTask</code></a> documentation.</div> |
| <dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../serialized-form.html#org.apache.ignite.compute.ComputeTaskAdapter">Serialized Form</a></dd></dl> |
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| <td class="colOne"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeTaskAdapter.html#ComputeTaskAdapter()">ComputeTaskAdapter</a></strong>()</code> </td> |
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| <td class="colFirst"><code><a href="../../../../org/apache/ignite/compute/ComputeJobResultPolicy.html" title="enum in org.apache.ignite.compute">ComputeJobResultPolicy</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/ignite/compute/ComputeTaskAdapter.html#result(org.apache.ignite.compute.ComputeJobResult,%20java.util.List)">result</a></strong>(<a href="../../../../org/apache/ignite/compute/ComputeJobResult.html" title="interface in org.apache.ignite.compute">ComputeJobResult</a> res, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../org/apache/ignite/compute/ComputeJobResult.html" title="interface in org.apache.ignite.compute">ComputeJobResult</a>> rcvd)</code> |
| <div class="block">Default implementation which will wait for all jobs to complete before |
| calling <a href="../../../../org/apache/ignite/compute/ComputeTask.html#reduce(java.util.List)"><code>ComputeTask.reduce(List)</code></a> method.</div> |
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| <h3>Methods inherited from interface org.apache.ignite.compute.<a href="../../../../org/apache/ignite/compute/ComputeTask.html" title="interface in org.apache.ignite.compute">ComputeTask</a></h3> |
| <code><a href="../../../../org/apache/ignite/compute/ComputeTask.html#map(java.util.List,%20T)">map</a>, <a href="../../../../org/apache/ignite/compute/ComputeTask.html#reduce(java.util.List)">reduce</a></code></li> |
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| <h4>ComputeTaskAdapter</h4> |
| <pre>public ComputeTaskAdapter()</pre> |
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| <h4>result</h4> |
| <pre>public <a href="../../../../org/apache/ignite/compute/ComputeJobResultPolicy.html" title="enum in org.apache.ignite.compute">ComputeJobResultPolicy</a> result(<a href="../../../../org/apache/ignite/compute/ComputeJobResult.html" title="interface in org.apache.ignite.compute">ComputeJobResult</a> res, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../org/apache/ignite/compute/ComputeJobResult.html" title="interface in org.apache.ignite.compute">ComputeJobResult</a>> rcvd) |
| throws <a href="../../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></pre> |
| <div class="block">Default implementation which will wait for all jobs to complete before |
| calling <a href="../../../../org/apache/ignite/compute/ComputeTask.html#reduce(java.util.List)"><code>ComputeTask.reduce(List)</code></a> method. |
| <p> |
| If remote job resulted in exception (<a href="../../../../org/apache/ignite/compute/ComputeJobResult.html#getException()"><code>ComputeJobResult.getException()</code></a> is not <code>null</code>), |
| then <a href="../../../../org/apache/ignite/compute/ComputeJobResultPolicy.html#FAILOVER"><code>ComputeJobResultPolicy.FAILOVER</code></a> policy will be returned if the exception is instance |
| of <a href="../../../../org/apache/ignite/cluster/ClusterTopologyException.html" title="class in org.apache.ignite.cluster"><code>ClusterTopologyException</code></a> or <a href="../../../../org/apache/ignite/compute/ComputeExecutionRejectedException.html" title="class in org.apache.ignite.compute"><code>ComputeExecutionRejectedException</code></a>, which means that |
| remote node either failed or job execution was rejected before it got a chance to start. In all |
| other cases the exception will be rethrown which will ultimately cause task to fail.</div> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="../../../../org/apache/ignite/compute/ComputeTask.html#result(org.apache.ignite.compute.ComputeJobResult,%20java.util.List)">result</a></code> in interface <code><a href="../../../../org/apache/ignite/compute/ComputeTask.html" title="interface in org.apache.ignite.compute">ComputeTask</a><<a href="../../../../org/apache/ignite/compute/ComputeTaskAdapter.html" title="type parameter in ComputeTaskAdapter">T</a>,<a href="../../../../org/apache/ignite/compute/ComputeTaskAdapter.html" title="type parameter in ComputeTaskAdapter">R</a>></code></dd> |
| <dt><span class="strong">Parameters:</span></dt><dd><code>res</code> - Received remote grid executable result.</dd><dd><code>rcvd</code> - All previously received results.</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>Result policy that dictates how to process further upcoming |
| job results.</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></code> - If handling a job result caused an error effectively rejecting |
| a failover. This exception will be thrown out of <a href="../../../../org/apache/ignite/compute/ComputeTaskFuture.html#get()"><code>ComputeTaskFuture.get()</code></a> method.</dd></dl> |
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