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 co-ordinate between the caller and the wrapped ItemStream.

Since:

2.0

Author:

Dave Syer

Nested Class Summary

static class

ChunkMonitor.ChunkMonitorData

Constructor Summary

ChunkMonitor()

Method Summary

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, setExecutionContextName

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

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)