javax.batch.api.partition

Class PartitionPlanImpl

java.lang.Object

javax.batch.api.partition.PartitionPlanImpl

All Implemented Interfaces:

PartitionPlan

public class PartitionPlanImpl
extends Object
implements PartitionPlan

The PartitionPlanImpl class provides a basic implementation of the PartitionPlan interface.

Constructor Summary

Constructors

Constructor and Description
PartitionPlanImpl()

Method Summary

Modifier and Type	Method and Description
Properties[]	getPartitionProperties() Gets array of Partition Properties objects for Partitions.
int	getPartitions() Gets count of Partitions.
boolean	getPartitionsOverride() Return current value of partition override setting.
int	getThreads() Gets maximum number of threads requested to use to run partitions for this step.
void	setPartitionProperties(Properties[] props) Sets array of substitution Properties objects for the set of Partitions.
void	setPartitions(int count) Set number of partitions.
void	setPartitionsOverride(boolean override) Specify whether or not to override the partition count from the previous job execution.
void	setThreads(int count) Set maximum number of threads requested to use to run partitions for this step.

Methods inherited from class java.lang.Object

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

Constructor Detail

PartitionPlanImpl

public PartitionPlanImpl()

Method Detail

setPartitions

public void setPartitions(int count)

Description copied from interface: PartitionPlan

Set number of partitions.

Specified by:

setPartitions in interface PartitionPlan

Parameters:

count - specifies the partition count

setThreads

public void setThreads(int count)

Description copied from interface: PartitionPlan

Set maximum number of threads requested to use to run partitions for this step. A value of '0' requests the batch implementation to use the partition count as the thread count. Note the batch runtime is not required to use this full number of threads; it may not have this many available, and may use less.

Specified by:

setThreads in interface PartitionPlan

Parameters:

count - specifies the requested thread count

setPartitionsOverride

public void setPartitionsOverride(boolean override)

Description copied from interface: PartitionPlan

Specify whether or not to override the partition count from the previous job execution. This applies only to step restart.

When false is specified, the partition count from the previous job execution is used and any new value set for partition count in the current run is ignored. In addition, partition results from the previous job execution are remembered, and only incomplete partitions are reprocessed.

When true is specified, the partition count from the current run is used and all results from past partitions are discarded. Any resource cleanup or back out of work done in the previous run is the responsibility of the application. The PartitionReducer artifact's rollbackPartitionedStep method is invoked during restart before any partitions begin processing to provide a cleanup hook.

Specified by:

setPartitionsOverride in interface PartitionPlan

Parameters:

override - See method description

getPartitionsOverride

public boolean getPartitionsOverride()

Description copied from interface: PartitionPlan

Return current value of partition override setting.

Specified by:

getPartitionsOverride in interface PartitionPlan

Returns:

override setting.

See Also:

PartitionPlan.setPartitionsOverride(boolean)

setPartitionProperties

public void setPartitionProperties(Properties[] props)

Description copied from interface: PartitionPlan

Sets array of substitution Properties objects for the set of Partitions.

Specified by:

setPartitionProperties in interface PartitionPlan

Parameters:

props - specifies the Properties object array

See Also:

PartitionPlan.getPartitionProperties()

getPartitions

public int getPartitions()

Description copied from interface: PartitionPlan

Gets count of Partitions.

Specified by:

getPartitions in interface PartitionPlan

Returns:

Partition count

getThreads

public int getThreads()

Description copied from interface: PartitionPlan

Gets maximum number of threads requested to use to run partitions for this step. A value of '0' requests the batch implementation to use the partition count as the thread count. Note the batch runtime is not required to use this full number of threads; it may not have this many available, and may use less.

Specified by:

getThreads in interface PartitionPlan

Returns:

requested thread count

getPartitionProperties

public Properties[] getPartitionProperties()

Description copied from interface: PartitionPlan

Gets array of Partition Properties objects for Partitions.

These can be used in Job XML substitution using substitution expressions with the syntax: #{partitionPlan['propertyName']}

Each element of the Properties array returned can be used to resolving substitutions for a single partition. In the typical use case, each Properties element will have a similar set of property names, with a substitution potentially resolving to the corresponding value for each partition.

Specified by:

getPartitionProperties in interface PartitionPlan

Returns:

Partition Properties object array