org.apache.camel.processor.aggregate
Class AggregateProcessor

java.lang.Object
  org.apache.camel.impl.ServiceSupport
      org.apache.camel.processor.aggregate.AggregateProcessor

All Implemented Interfaces:

Navigate<Processor>, Processor, Traceable, Service, ShutdownableService

public class AggregateProcessor
extends ServiceSupport
implements Processor, Navigate<Processor>, Traceable

An implementation of the Aggregator pattern where a batch of messages are processed (up to a maximum amount or until some timeout is reached) and messages for the same correlation key are combined together using some kind of AggregationStrategy (by default the latest message is used) to compress many message exchanges into a smaller number of exchanges.

A good example of this is stock market data; you may be receiving 30,000 messages/second and you may want to throttle it right down so that multiple messages for the same stock are combined (or just the latest message is used and older prices are discarded). Another idea is to combine line item messages together into a single invoice message.

Version:

Constructor Summary

AggregateProcessor(CamelContext camelContext, Processor processor, Expression correlationExpression, AggregationStrategy aggregationStrategy, ExecutorService executorService)

Method Summary

protected void	doShutdown() Implementations override this method to perform customized shutdown
protected void	doStart()
protected void	doStop()
AggregationRepository	getAggregationRepository()
Integer	getCloseCorrelationKeyOnCompletion()
long	getCompletionInterval()
Predicate	getCompletionPredicate()
int	getCompletionSize()
Expression	getCompletionSizeExpression()
long	getCompletionTimeout()
Expression	getCompletionTimeoutExpression()
ExceptionHandler	getExceptionHandler()
String	getTraceLabel() Gets the trace label used for logging when tracing is enabled.
boolean	hasNext() Are there more outputs?
protected String	isCompleted(String key, Exchange exchange) Tests whether the given exchange is complete or not
boolean	isCompletionFromBatchConsumer()
boolean	isDiscardOnCompletionTimeout()
boolean	isEagerCheckCompletion()
boolean	isIgnoreInvalidCorrelationKeys()
boolean	isParallelProcessing()
List<Processor>	next() Next group of outputs
protected Exchange	onAggregation(Exchange oldExchange, Exchange newExchange)
protected void	onCompletion(String key, Exchange exchange, boolean fromTimeout)
void	process(Exchange exchange) Processes the message exchange
void	setAggregationRepository(AggregationRepository aggregationRepository)
void	setCloseCorrelationKeyOnCompletion(Integer closeCorrelationKeyOnCompletion)
void	setCompletionFromBatchConsumer(boolean completionFromBatchConsumer)
void	setCompletionInterval(long completionInterval)
void	setCompletionPredicate(Predicate completionPredicate)
void	setCompletionSize(int completionSize)
void	setCompletionSizeExpression(Expression completionSizeExpression)
void	setCompletionTimeout(long completionTimeout)
void	setCompletionTimeoutExpression(Expression completionTimeoutExpression)
void	setDiscardOnCompletionTimeout(boolean discardOnCompletionTimeout)
void	setEagerCheckCompletion(boolean eagerCheckCompletion)
void	setExceptionHandler(ExceptionHandler exceptionHandler)
void	setIgnoreInvalidCorrelationKeys(boolean ignoreInvalidCorrelationKeys)
void	setParallelProcessing(boolean parallelProcessing)
String	toString()

Methods inherited from class org.apache.camel.impl.ServiceSupport

addChildService, doResume, doSuspend, getStatus, getVersion, isRunAllowed, isStarted, isStarting, isStopped, isStopping, isSuspended, isSuspending, removeChildService, resume, shutdown, start, start, stop, suspend

Methods inherited from class java.lang.Object

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

Constructor Detail

AggregateProcessor

public AggregateProcessor(CamelContext camelContext,
                          Processor processor,
                          Expression correlationExpression,
                          AggregationStrategy aggregationStrategy,
                          ExecutorService executorService)

Method Detail

toString

public String toString()

Overrides:

toString in class Object

getTraceLabel

public String getTraceLabel()

Description copied from interface: Traceable

Gets the trace label used for logging when tracing is enabled.

The label should be short and precise.

Specified by:

getTraceLabel in interface Traceable

Returns:

the label

next

public List<Processor> next()

Description copied from interface: Navigate

Next group of outputs

Specified by:

next in interface Navigate<Processor>

Returns:

next group or null if no more outputs

hasNext

public boolean hasNext()

Description copied from interface: Navigate

Are there more outputs?

Specified by:

hasNext in interface Navigate<Processor>

Returns:

true if more outputs

process

public void process(Exchange exchange)
             throws Exception

Description copied from interface: Processor

Processes the message exchange

Specified by:

process in interface Processor

Parameters:

exchange - the message exchange

Throws:

Exception - if an internal processing error has occurred.

isCompleted

protected String isCompleted(String key,
                             Exchange exchange)

Tests whether the given exchange is complete or not

Parameters:

key - the correlation key

exchange - the incoming exchange

Returns:

null if not completed, otherwise a String with the type that triggered the completion

onAggregation

protected Exchange onAggregation(Exchange oldExchange,
                                 Exchange newExchange)

onCompletion

protected void onCompletion(String key,
                            Exchange exchange,
                            boolean fromTimeout)

getCompletionPredicate

public Predicate getCompletionPredicate()

setCompletionPredicate

public void setCompletionPredicate(Predicate completionPredicate)

isEagerCheckCompletion

public boolean isEagerCheckCompletion()

setEagerCheckCompletion

public void setEagerCheckCompletion(boolean eagerCheckCompletion)

getCompletionTimeout

public long getCompletionTimeout()

setCompletionTimeout

public void setCompletionTimeout(long completionTimeout)

getCompletionTimeoutExpression

public Expression getCompletionTimeoutExpression()

setCompletionTimeoutExpression

public void setCompletionTimeoutExpression(Expression completionTimeoutExpression)

getCompletionInterval

public long getCompletionInterval()

setCompletionInterval

public void setCompletionInterval(long completionInterval)

getCompletionSize

public int getCompletionSize()

setCompletionSize

public void setCompletionSize(int completionSize)

getCompletionSizeExpression

public Expression getCompletionSizeExpression()

setCompletionSizeExpression

public void setCompletionSizeExpression(Expression completionSizeExpression)

isIgnoreInvalidCorrelationKeys

public boolean isIgnoreInvalidCorrelationKeys()

setIgnoreInvalidCorrelationKeys

public void setIgnoreInvalidCorrelationKeys(boolean ignoreInvalidCorrelationKeys)

getCloseCorrelationKeyOnCompletion

public Integer getCloseCorrelationKeyOnCompletion()

setCloseCorrelationKeyOnCompletion

public void setCloseCorrelationKeyOnCompletion(Integer closeCorrelationKeyOnCompletion)

isCompletionFromBatchConsumer

public boolean isCompletionFromBatchConsumer()

setCompletionFromBatchConsumer

public void setCompletionFromBatchConsumer(boolean completionFromBatchConsumer)

getExceptionHandler

public ExceptionHandler getExceptionHandler()

setExceptionHandler

public void setExceptionHandler(ExceptionHandler exceptionHandler)

isParallelProcessing

public boolean isParallelProcessing()

setParallelProcessing

public void setParallelProcessing(boolean parallelProcessing)

getAggregationRepository

public AggregationRepository getAggregationRepository()

setAggregationRepository

public void setAggregationRepository(AggregationRepository aggregationRepository)

isDiscardOnCompletionTimeout

public boolean isDiscardOnCompletionTimeout()

setDiscardOnCompletionTimeout

public void setDiscardOnCompletionTimeout(boolean discardOnCompletionTimeout)

doStart

protected void doStart()
                throws Exception

Specified by:

doStart in class ServiceSupport

Throws:

Exception

doStop

protected void doStop()
               throws Exception

Specified by:

doStop in class ServiceSupport

Throws:

Exception

doShutdown

protected void doShutdown()
                   throws Exception

Description copied from class: ServiceSupport

Implementations override this method to perform customized shutdown

Overrides:

doShutdown in class ServiceSupport

Throws:

Exception