org.springframework.batch.core.partition.support
Class TaskExecutorPartitionHandler

java.lang.Object
  org.springframework.batch.core.partition.support.AbstractPartitionHandler
      org.springframework.batch.core.partition.support.TaskExecutorPartitionHandler

All Implemented Interfaces:

PartitionHandler, StepHolder, org.springframework.beans.factory.InitializingBean

public class TaskExecutorPartitionHandler
extends AbstractPartitionHandler
implements StepHolder, org.springframework.beans.factory.InitializingBean

A PartitionHandler that uses a TaskExecutor to execute the partitioned Step locally in multiple threads. This can be an effective approach for scaling batch steps that are IO intensive, like directory and filesystem scanning and copying.

By default, the thread pool is synchronous.

Since:

2.0

Author:

Sebastien Gerard, Dave Syer

Constructor Summary

TaskExecutorPartitionHandler()

Method Summary

void	afterPropertiesSet()
protected FutureTask<StepExecution>	createTask(Step step, StepExecution stepExecution) Creates the task executing the given step in the context of the given execution.
protected Set<StepExecution>	doHandle(StepExecution masterStepExecution, Set<StepExecution> partitionStepExecutions) Executes the specified StepExecution instances and returns an updated view of them.
Step	getStep() The step instance that will be executed in parallel by this handler.
void	setStep(Step step) Setter for the Step that will be used to execute the partitioned StepExecution.
void	setTaskExecutor(org.springframework.core.task.TaskExecutor taskExecutor) Setter for the TaskExecutor that is used to farm out step executions to multiple threads.

Methods inherited from class org.springframework.batch.core.partition.support.AbstractPartitionHandler

getGridSize, handle, setGridSize

Methods inherited from class java.lang.Object

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

Constructor Detail

TaskExecutorPartitionHandler

public TaskExecutorPartitionHandler()

Method Detail

afterPropertiesSet

public void afterPropertiesSet()
                        throws Exception

Specified by:

afterPropertiesSet in interface org.springframework.beans.factory.InitializingBean

Throws:

Exception

setTaskExecutor

public void setTaskExecutor(org.springframework.core.task.TaskExecutor taskExecutor)

Setter for the TaskExecutor that is used to farm out step executions to multiple threads.

Parameters:

taskExecutor - a TaskExecutor

setStep

public void setStep(Step step)

Setter for the Step that will be used to execute the partitioned StepExecution. This is a regular Spring Batch step, with all the business logic required to complete an execution based on the input parameters in its StepExecution context.

Parameters:

step - the Step instance to use to execute business logic

getStep

public Step getStep()

The step instance that will be executed in parallel by this handler.

Specified by:

getStep in interface StepHolder

Returns:

the step instance that will be used

See Also:

StepHolder.getStep()

doHandle

protected Set<StepExecution> doHandle(StepExecution masterStepExecution,
                                      Set<StepExecution> partitionStepExecutions)
                               throws Exception

Description copied from class: AbstractPartitionHandler

Executes the specified StepExecution instances and returns an updated view of them. Throws an Exception if anything goes wrong.

Specified by:

doHandle in class AbstractPartitionHandler

Parameters:

masterStepExecution - the whole partition execution

partitionStepExecutions - the StepExecution instances to execute

Returns:

an updated view of these completed StepExecution instances

Throws:

Exception - if anything goes wrong. This allows implementations to be liberal and rely on the caller to translate an exception into a step failure as necessary.

createTask

protected FutureTask<StepExecution> createTask(Step step,
                                               StepExecution stepExecution)

Creates the task executing the given step in the context of the given execution.

Parameters:

step - the step to execute

stepExecution - the given execution

Returns:

the task executing the given step