org.apache.ignite.ml.genetic

Class FitnessTask

java.lang.Object

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

org.apache.ignite.ml.genetic.FitnessTask

All Implemented Interfaces:

Serializable, ComputeTask<List<Long>,Boolean>

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

Responsible for fitness operation

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
FitnessTask(GAConfiguration cfg)

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) Reduces (or aggregates) results received so far into one compound result to be returned to caller via ComputeTaskFuture.get() method.
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

FitnessTask

public FitnessTask(GAConfiguration cfg)

Parameters:

cfg - GAConfiguration

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 - List of chromosome keys

Returns:

Map of jobs to nodes

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

Description copied from interface: ComputeTask

Reduces (or aggregates) results received so far into one compound result to be returned to caller via ComputeTaskFuture.get() method.

Note, that if some jobs did not succeed and could not be failed over then the list of results passed into this method will include the failed results. Otherwise, failed results will not be in the list.

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