org.springframework.batch.integration.chunk

Class ChunkMessageChannelItemWriter<T>

java.lang.Object

org.springframework.batch.core.listener.StepExecutionListenerSupport

org.springframework.batch.integration.chunk.ChunkMessageChannelItemWriter<T>

All Implemented Interfaces:

StepExecutionListener, StepListener, StepContributionSource, ItemStream, ItemWriter<T>

public class ChunkMessageChannelItemWriter<T>
extends StepExecutionListenerSupport
implements ItemWriter<T>, ItemStream, StepContributionSource

Constructor Summary

Constructors

Constructor and Description
ChunkMessageChannelItemWriter()

Method Summary

Modifier and Type	Method and Description
ExitStatus	afterStep(StepExecution stepExecution) Give a listener a chance to modify the exit status from a step.
void	beforeStep(StepExecution stepExecution) Initialize the state of the listener with the StepExecution from the current scope.
void	close() If any resources are needed for the stream to operate they need to be destroyed here.
java.util.Collection<StepContribution>	getStepContributions() Get the currently available contributions and drain the source.
void	open(ExecutionContext executionContext) Open the stream for the provided ExecutionContext.
void	setMaxWaitTimeouts(int maxWaitTimeouts) The maximum number of times to wait at the end of a step for a non-null result from the remote workers.
void	setMessagingOperations(org.springframework.integration.core.MessagingTemplate messagingGateway)
void	setReplyChannel(org.springframework.messaging.PollableChannel replyChannel)
void	setThrottleLimit(long throttleLimit) Public setter for the throttle limit.
void	update(ExecutionContext executionContext) Indicates that the execution context provided during open is about to be saved.
void	write(java.util.List<? extends T> items) Process the supplied data element.

Methods inherited from class java.lang.Object

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

Constructor Detail

ChunkMessageChannelItemWriter

public ChunkMessageChannelItemWriter()

Method Detail

setMaxWaitTimeouts

public void setMaxWaitTimeouts(int maxWaitTimeouts)

The maximum number of times to wait at the end of a step for a non-null result from the remote workers. This is a multiplier on the receive timeout set separately on the gateway. The ideal value is a compromise between allowing slow workers time to finish, and responsiveness if there is a dead worker. Defaults to 40.

Parameters:

maxWaitTimeouts - the maximum number of wait timeouts

setThrottleLimit

public void setThrottleLimit(long throttleLimit)

Public setter for the throttle limit. This limits the number of pending requests for chunk processing to avoid overwhelming the receivers.

Parameters:

throttleLimit - the throttle limit to set

setMessagingOperations

public void setMessagingOperations(org.springframework.integration.core.MessagingTemplate messagingGateway)

setReplyChannel

public void setReplyChannel(org.springframework.messaging.PollableChannel replyChannel)

write

public void write(java.util.List<? extends T> items)
           throws java.lang.Exception

Description copied from interface: ItemWriter

Process the supplied data element. Will not be called with any null items in normal operation.

Specified by:

write in interface ItemWriter<T>

Parameters:

items - items to be written

Throws:

java.lang.Exception - if there are errors. The framework will catch the exception and convert or rethrow it as appropriate.

beforeStep

public void beforeStep(StepExecution stepExecution)

Description copied from interface: StepExecutionListener

Initialize the state of the listener with the StepExecution from the current scope.

Specified by:

beforeStep in interface StepExecutionListener

Overrides:

beforeStep in class StepExecutionListenerSupport

Parameters:

stepExecution - instance of StepExecution.

afterStep

public ExitStatus afterStep(StepExecution stepExecution)

Description copied from interface: StepExecutionListener

Give a listener a chance to modify the exit status from a step. The value returned will be combined with the normal exit status using ExitStatus.and(ExitStatus). Called after execution of step's processing logic (both successful or failed). Throwing exception in this method has no effect, it will only be logged.

Specified by:

afterStep in interface StepExecutionListener

Overrides:

afterStep in class StepExecutionListenerSupport

Parameters:

stepExecution - StepExecution instance.

Returns:

an ExitStatus to combine with the normal value. Return null to leave the old value unchanged.

close

public void close()
           throws ItemStreamException

Description copied from interface: ItemStream

If any resources are needed for the stream to operate they need to be destroyed here. Once this method has been called all other methods (except open) may throw an exception.

Specified by:

close in interface ItemStream

Throws:

ItemStreamException

open

public void open(ExecutionContext executionContext)
          throws ItemStreamException

Description copied from interface: ItemStream

Open the stream for the provided ExecutionContext.

Specified by:

open in interface ItemStream

Parameters:

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

Throws:

ItemStreamException

update

public void update(ExecutionContext executionContext)
            throws ItemStreamException

Description copied from interface: ItemStream

Indicates that the execution context provided during open is about to be saved. If any state is remaining, but has not been put in the context, it should be added here.

Specified by:

update in interface ItemStream

Parameters:

executionContext - to be updated

Throws:

ItemStreamException

getStepContributions

public java.util.Collection<StepContribution> getStepContributions()

Description copied from interface: StepContributionSource

Get the currently available contributions and drain the source. The next call would return an empty collection, unless new contributions have arrived.

Specified by:

getStepContributions in interface StepContributionSource

Returns:

a collection of StepContribution instances