org.springframework.batch.core.step.item

Class ChunkMonitor

java.lang.Object

org.springframework.batch.item.ItemStreamSupport

org.springframework.batch.core.step.item.ChunkMonitor

All Implemented Interfaces:

ItemStream

public class ChunkMonitor
extends ItemStreamSupport

Manage the offset data between the last successful commit and updates made to an input chunk. Only works with single threaded steps because it has to use a ThreadLocal to manage the state and coordinate between the caller and the wrapped ItemStream.

Since:

2.0

Author:

Dave Syer

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ChunkMonitor.ChunkMonitorData

Constructor Summary

Constructors

Constructor and Description
ChunkMonitor()

Method Summary

Modifier and Type	Method and Description
void	close() No-op.
int	getOffset()
void	incrementOffset()
void	open(ExecutionContext executionContext) No-op.
void	registerItemStream(ItemStream stream)
void	resetOffset()
void	setChunkSize(int chunkSize)
void	setItemReader(ItemReader<?> reader)
void	update(ExecutionContext executionContext) Return empty ExecutionContext.

Methods inherited from class org.springframework.batch.item.ItemStreamSupport

getExecutionContextKey, getName, setExecutionContextName, setName

Methods inherited from class java.lang.Object

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

Constructor Detail

ChunkMonitor

public ChunkMonitor()

Method Detail

registerItemStream

public void registerItemStream(ItemStream stream)

Parameters:

stream - the stream to set

setItemReader

public void setItemReader(ItemReader<?> reader)

Parameters:

reader - the reader to set

incrementOffset

public void incrementOffset()

getOffset

public int getOffset()

resetOffset

public void resetOffset()

setChunkSize

public void setChunkSize(int chunkSize)

close

public void close()
           throws ItemStreamException

Description copied from class: ItemStreamSupport

No-op.

Specified by:

close in interface ItemStream

Overrides:

close in class ItemStreamSupport

Throws:

ItemStreamException

See Also:

ItemStream.close()

open

public void open(ExecutionContext executionContext)
          throws ItemStreamException

Description copied from class: ItemStreamSupport

No-op.

Specified by:

open in interface ItemStream

Overrides:

open in class ItemStreamSupport

Parameters:

executionContext - current step's ExecutionContext. Will be the executionContext from the last run of the step on a restart.

Throws:

ItemStreamException

See Also:

ItemStream.open(ExecutionContext)

update

public void update(ExecutionContext executionContext)
            throws ItemStreamException

Description copied from class: ItemStreamSupport

Return empty ExecutionContext.

Specified by:

update in interface ItemStream

Overrides:

update in class ItemStreamSupport

Parameters:

executionContext - to be updated

Throws:

ItemStreamException

See Also:

ItemStream.update(ExecutionContext)