org.springframework.batch.core.step.item

Class SimpleChunkProvider<I>

java.lang.Object

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

All Implemented Interfaces:

ChunkProvider<I>

Direct Known Subclasses:

FaultTolerantChunkProvider

public class SimpleChunkProvider<I>
extends java.lang.Object
implements ChunkProvider<I>

Simple implementation of the ChunkProvider interface that does basic chunk providing from an ItemReader.

Author:

Dave Syer, Michael Minella

See Also:

ChunkOrientedTasklet

Field Summary

Fields

Modifier and Type	Field and Description
protected ItemReader<? extends I>	itemReader
protected org.apache.commons.logging.Log	logger

Constructor Summary

Constructors

Constructor and Description
SimpleChunkProvider(ItemReader<? extends I> itemReader, RepeatOperations repeatOperations)

Method Summary

Modifier and Type	Method and Description
protected I	doRead() Surrounds the read call with listener callbacks.
protected MulticasterBatchListener<I,?>	getListener()
void	postProcess(StepContribution contribution, Chunk<I> chunk)
Chunk<I>	provide(StepContribution contribution)
protected I	read(StepContribution contribution, Chunk<I> chunk) Delegates to doRead().
void	registerListener(StepListener listener) Register a listener for callbacks at the appropriate stages in a process.
void	setListeners(java.util.List<? extends StepListener> listeners) Register some StepListeners with the handler.

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected final org.apache.commons.logging.Log logger

itemReader

protected final ItemReader<? extends I> itemReader

Constructor Detail

SimpleChunkProvider

public SimpleChunkProvider(ItemReader<? extends I> itemReader,
                           RepeatOperations repeatOperations)

Method Detail

setListeners

public void setListeners(java.util.List<? extends StepListener> listeners)

Register some StepListeners with the handler. Each will get the callbacks in the order specified at the correct stage.

Parameters:

listeners -

registerListener

public void registerListener(StepListener listener)

Register a listener for callbacks at the appropriate stages in a process.

Parameters:

listener - a StepListener

getListener

protected MulticasterBatchListener<I,?> getListener()

Returns:

the listener

doRead

protected final I doRead()
                  throws java.lang.Exception

Surrounds the read call with listener callbacks.

Returns:

item

Throws:

java.lang.Exception

provide

public Chunk<I> provide(StepContribution contribution)
                 throws java.lang.Exception

Specified by:

provide in interface ChunkProvider<I>

Throws:

java.lang.Exception

postProcess

public void postProcess(StepContribution contribution,
                        Chunk<I> chunk)

Specified by:

postProcess in interface ChunkProvider<I>

read

protected I read(StepContribution contribution,
                 Chunk<I> chunk)
          throws SkipOverflowException,
                 java.lang.Exception

Delegates to doRead(). Subclasses can add additional behaviour (e.g. exception handling).

Parameters:

contribution - the current step execution contribution

chunk - the current chunk

Returns:

a new item for processing

Throws:

SkipOverflowException - if specifically the chunk is accumulating too much data (e.g. skips) and it wants to force a commit.

java.lang.Exception - if there is a generic issue