org.apache.ignite.ml.genetic

Class TruncateSelectionTask

java.lang.Object

org.apache.ignite.compute.ComputeTaskAdapter<List<Long>,Boolean>

org.apache.ignite.ml.genetic.TruncateSelectionTask

All Implemented Interfaces:

Serializable, ComputeTask<List<Long>,Boolean>

public class TruncateSelectionTask
extends ComputeTaskAdapter<List<Long>,Boolean>

Responsible for performing truncate selection.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
TruncateSelectionTask(List<Long> fittestKeys, int numOfCopies)

Method Summary

Modifier and Type	Method and Description
Map	map(List<ClusterNode> nodes, List<Long> chromosomeKeys) This method is called to map or split grid task into multiple grid jobs.
Boolean	reduce(List<ComputeJobResult> list) We return TRUE if success, else Exception is thrown.
ComputeJobResultPolicy	result(ComputeJobResult res, List<ComputeJobResult> rcvd) Default implementation which will wait for all jobs to complete before calling ComputeTask.reduce(List) method.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TruncateSelectionTask

public TruncateSelectionTask(List<Long> fittestKeys,
                             int numOfCopies)

Parameters:

fittestKeys - List of long.

numOfCopies - Number of Copies.

Method Detail

map

public Map map(List<ClusterNode> nodes,
               List<Long> chromosomeKeys)
        throws IgniteException

Description copied from interface: ComputeTask

This method is called to map or split grid task into multiple grid jobs. This is the first method that gets called when task execution starts.

Parameters:

nodes - List of ClusterNode.

chromosomeKeys - Primary keys for respective chromosomes.

Returns:

Map of nodes to jobs.

Throws:

IgniteException - If mapping could not complete successfully. This exception will be thrown out of ComputeTaskFuture.get() method.

reduce

public Boolean reduce(List<ComputeJobResult> list)
               throws IgniteException

We return TRUE if success, else Exception is thrown.

Parameters:

list - List of ComputeJobResult.

Returns:

Boolean value.

Throws:

IgniteException - If reduction or results caused an error. This exception will be thrown out of ComputeTaskFuture.get() method.

result

public ComputeJobResultPolicy result(ComputeJobResult res,
                                     List<ComputeJobResult> rcvd)

Description copied from class: ComputeTaskAdapter

Default implementation which will wait for all jobs to complete before calling ComputeTask.reduce(List) method.

If remote job resulted in exception (ComputeJobResult.getException() is not null), then ComputeJobResultPolicy.FAILOVER policy will be returned if the exception is instance of ClusterTopologyException or ComputeExecutionRejectedException, 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.

Specified by:

result in interface ComputeTask<List<Long>,Boolean>

Overrides:

result in class ComputeTaskAdapter<List<Long>,Boolean>

Parameters:

res - ComputeJobResult.

rcvd - List of ComputeJobResult.

Returns:

ComputeJobResultPolicy.