org.springframework.batch.core.step.item

Class ChunkOrientedTasklet<I>

java.lang.Object

org.springframework.batch.core.step.item.ChunkOrientedTasklet<I>

Type Parameters:

I - input item type

All Implemented Interfaces:

Tasklet

public class ChunkOrientedTasklet<I>
extends java.lang.Object
implements Tasklet

A Tasklet implementing variations on read-process-write item handling.

Author:

Dave Syer

Constructor Summary

Constructors

Constructor and Description
ChunkOrientedTasklet(ChunkProvider<I> chunkProvider, ChunkProcessor<I> chunkProcessor)

Method Summary

Modifier and Type	Method and Description
RepeatStatus	execute(StepContribution contribution, ChunkContext chunkContext) Given the current context in the form of a step contribution, do whatever is necessary to process this unit inside a transaction.
void	setBuffering(boolean buffering) Flag to indicate that items should be buffered once read.

Methods inherited from class java.lang.Object

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

Constructor Detail

ChunkOrientedTasklet

public ChunkOrientedTasklet(ChunkProvider<I> chunkProvider,
                            ChunkProcessor<I> chunkProcessor)

Method Detail

setBuffering

public void setBuffering(boolean buffering)

Flag to indicate that items should be buffered once read. Defaults to true, which is appropriate for forward-only, non-transactional item readers. Main (or only) use case for setting this flag to false is a transactional JMS item reader.

Parameters:

buffering - indicator

execute

@Nullable
public RepeatStatus execute(StepContribution contribution,
                                      ChunkContext chunkContext)
                               throws java.lang.Exception

Description copied from interface: Tasklet

Given the current context in the form of a step contribution, do whatever is necessary to process this unit inside a transaction. Implementations return RepeatStatus.FINISHED if finished. If not they return RepeatStatus.CONTINUABLE. On failure throws an exception.

Specified by:

execute in interface Tasklet

Parameters:

contribution - mutable state to be passed back to update the current step execution

chunkContext - attributes shared between invocations but not between restarts

Returns:

an RepeatStatus indicating whether processing is continuable. Returning null is interpreted as RepeatStatus.FINISHED

Throws:

java.lang.Exception - thrown if error occurs during execution.