Package org.springframework.integration.aggregator

Class BarrierMessageHandler

java.lang.Object

org.springframework.integration.context.IntegrationObjectSupport

org.springframework.integration.handler.MessageHandlerSupport

org.springframework.integration.handler.AbstractMessageHandler

org.springframework.integration.handler.AbstractMessageProducingHandler

org.springframework.integration.handler.AbstractReplyProducingMessageHandler

org.springframework.integration.aggregator.BarrierMessageHandler

All Implemented Interfaces:

org.reactivestreams.Subscriber<Message<?>>, Aware, BeanClassLoaderAware, BeanFactoryAware, BeanNameAware, DisposableBean, InitializingBean, ApplicationContextAware, Ordered, ExpressionCapable, Orderable, MessageProducer, DiscardingMessageHandler, HeaderPropagationAware, MessageTriggerAction, IntegrationPattern, NamedComponent, IntegrationManagement, TrackableComponent, MessageHandler, reactor.core.CoreSubscriber<Message<?>>

public class BarrierMessageHandler
extends AbstractReplyProducingMessageHandler
implements MessageTriggerAction, DiscardingMessageHandler

A message handler that suspends the thread until a message with corresponding correlation is passed into the trigger method or the timeout occurs. Only one thread with a particular correlation (result of invoking the CorrelationStrategy) can be suspended at a time. If the inbound thread does not arrive before the trigger thread, the latter is suspended until it does, or the timeout occurs. Separate timeouts may be configured for request and trigger messages.

The default CorrelationStrategy is a HeaderAttributeCorrelationStrategy.

The default output processor is a DefaultAggregatingMessageGroupProcessor.

Since:

4.2

Author:

Gary Russell, Artem Bilan, Michel Jung

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.integration.handler.AbstractReplyProducingMessageHandler

AbstractReplyProducingMessageHandler.RequestHandler

Nested classes/interfaces inherited from interface org.springframework.integration.support.management.IntegrationManagement

IntegrationManagement.ManagementOverrides

Field Summary

Fields inherited from class org.springframework.integration.handler.AbstractMessageProducingHandler

messagingTemplate

Fields inherited from class org.springframework.integration.context.IntegrationObjectSupport

EXPRESSION_PARSER, logger

Fields inherited from interface org.springframework.integration.support.management.IntegrationManagement

METER_PREFIX, RECEIVE_COUNTER_NAME, SEND_TIMER_NAME

Fields inherited from interface org.springframework.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

Constructor Summary

Constructors

Constructor	Description
BarrierMessageHandler(long timeout)	Construct an instance with the provided timeout and default correlation and output strategies.
BarrierMessageHandler(long requestTimeout, long triggerTimeout)	Construct an instance with the provided timeouts and default correlation and output strategies.
BarrierMessageHandler(long requestTimeout, long triggerTimeout, CorrelationStrategy correlationStrategy)	Construct an instance with the provided timeout and correlation strategy, and default output processor.
BarrierMessageHandler(long requestTimeout, long triggerTimeout, MessageGroupProcessor outputProcessor)	Construct an instance with the provided timeout and output processor, and default correlation strategy.
BarrierMessageHandler(long requestTimeout, long triggerTimeout, MessageGroupProcessor outputProcessor, CorrelationStrategy correlationStrategy)	Construct an instance with the provided timeout and output processor, and default correlation strategy.
BarrierMessageHandler(long timeout, CorrelationStrategy correlationStrategy)	Construct an instance with the provided timeout and correlation strategy, and default output processor.
BarrierMessageHandler(long timeout, MessageGroupProcessor outputProcessor)	Construct an instance with the provided timeout and output processor, and default correlation strategy.
BarrierMessageHandler(long timeout, MessageGroupProcessor outputProcessor, CorrelationStrategy correlationStrategy)	Construct an instance with the provided timeout and output processor, and default correlation strategy.

Method Summary

Modifier and Type	Method	Description
protected Object	buildResult(Object key, Message<?> requestMessage, Message<?> releaseMessage)	Override to change the default mechanism by which the inbound and release messages are returned as a result.
String	getComponentType()	Subclasses may implement this method to provide component type information.
MessageChannel	getDiscardChannel()	Return the discard channel.
IntegrationPatternType	getIntegrationPatternType()	Return a pattern type this component implements.
protected Object	handleRequestMessage(Message<?> requestMessage)	Subclasses must implement this method to handle the request Message.
void	setDiscardChannel(MessageChannel discardChannel)	Set the channel to which late arriving trigger messages are sent.
void	setDiscardChannelName(String discardChannelName)	Set the name of the channel to which late arriving trigger messages are sent.
void	trigger(Message<?> message)	Take some action based on the message.

Methods inherited from class org.springframework.integration.handler.AbstractReplyProducingMessageHandler

doInit, doInvokeAdvisedRequestHandler, getBeanClassLoader, getRequiresReply, handleMessageInternal, hasAdviceChain, onInit, setAdviceChain, setBeanClassLoader, setRequiresReply

Methods inherited from class org.springframework.integration.handler.AbstractMessageProducingHandler

addNotPropagatedHeaders, createOutputMessage, getNotPropagatedHeaders, getOutputChannel, isAsync, messageBuilderForReply, produceOutput, resolveErrorChannel, sendErrorMessage, sendOutput, sendOutputs, setAsync, setNotPropagatedHeaders, setOutputChannel, setOutputChannelName, setSendTimeout, setupMessageProcessor, shouldCopyRequestHeaders, shouldSplitOutput, updateNotPropagatedHeaders

Methods inherited from class org.springframework.integration.handler.AbstractMessageHandler

handleMessage, onComplete, onError, onNext, onSubscribe, setObservationConvention

Methods inherited from class org.springframework.integration.handler.MessageHandlerSupport

buildSendTimer, destroy, getManagedName, getManagedType, getMetricsCaptor, getObservationRegistry, getOrder, getOverrides, isLoggingEnabled, isObserved, registerMetricsCaptor, registerObservationRegistry, sendTimer, setLoggingEnabled, setManagedName, setManagedType, setOrder, setShouldTrack, shouldTrack

Methods inherited from class org.springframework.integration.context.IntegrationObjectSupport

afterPropertiesSet, extractTypeIfPossible, generateId, getApplicationContext, getApplicationContextId, getBeanDescription, getBeanFactory, getBeanName, getChannelResolver, getComponentName, getConversionService, getExpression, getIntegrationProperties, getMessageBuilderFactory, getTaskScheduler, isInitialized, setApplicationContext, setBeanFactory, setBeanName, setChannelResolver, setComponentName, setConversionService, setMessageBuilderFactory, setPrimaryExpression, setTaskScheduler, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface reactor.core.CoreSubscriber

currentContext

Methods inherited from interface org.springframework.integration.support.management.IntegrationManagement

getThisAs

Methods inherited from interface org.springframework.messaging.MessageHandler

handleMessage

Methods inherited from interface org.springframework.integration.support.context.NamedComponent

getBeanName, getComponentName

Constructor Details

BarrierMessageHandler

public BarrierMessageHandler(long timeout)

Construct an instance with the provided timeout and default correlation and output strategies.

Parameters:

timeout - the timeout in milliseconds for both, request and trigger messages.

BarrierMessageHandler

public BarrierMessageHandler(long timeout,
 MessageGroupProcessor outputProcessor)

Construct an instance with the provided timeout and output processor, and default correlation strategy.

Parameters:

timeout - the timeout in milliseconds for both, request and trigger messages.

outputProcessor - the output MessageGroupProcessor.

BarrierMessageHandler

public BarrierMessageHandler(long timeout,
 CorrelationStrategy correlationStrategy)

Construct an instance with the provided timeout and correlation strategy, and default output processor.

Parameters:

timeout - the timeout in milliseconds for both, request and trigger messages.

correlationStrategy - the correlation strategy.

BarrierMessageHandler

public BarrierMessageHandler(long timeout,
 MessageGroupProcessor outputProcessor,
 CorrelationStrategy correlationStrategy)

Construct an instance with the provided timeout and output processor, and default correlation strategy.

Parameters:

timeout - the timeout in milliseconds for both, request and trigger messages.

outputProcessor - the output MessageGroupProcessor.

correlationStrategy - the correlation strategy.

BarrierMessageHandler

public BarrierMessageHandler(long requestTimeout,
 long triggerTimeout)

Construct an instance with the provided timeouts and default correlation and output strategies.

Parameters:

requestTimeout - the timeout in milliseconds when waiting for trigger message.

triggerTimeout - the timeout in milliseconds when waiting for a request message.

Since:

5.4

BarrierMessageHandler

public BarrierMessageHandler(long requestTimeout,
 long triggerTimeout,
 MessageGroupProcessor outputProcessor)

Construct an instance with the provided timeout and output processor, and default correlation strategy.

Parameters:

requestTimeout - the timeout in milliseconds when waiting for trigger message.

triggerTimeout - the timeout in milliseconds when waiting for a request message.

outputProcessor - the output MessageGroupProcessor.

Since:

5.4

BarrierMessageHandler

public BarrierMessageHandler(long requestTimeout,
 long triggerTimeout,
 CorrelationStrategy correlationStrategy)

Construct an instance with the provided timeout and correlation strategy, and default output processor.

Parameters:

requestTimeout - the timeout in milliseconds when waiting for trigger message.

triggerTimeout - the timeout in milliseconds when waiting for a request message.

correlationStrategy - the correlation strategy.

Since:

5.4

BarrierMessageHandler

public BarrierMessageHandler(long requestTimeout,
 long triggerTimeout,
 MessageGroupProcessor outputProcessor,
 CorrelationStrategy correlationStrategy)

Construct an instance with the provided timeout and output processor, and default correlation strategy.

Parameters:

requestTimeout - the timeout in milliseconds when waiting for trigger message.

triggerTimeout - the timeout in milliseconds when waiting for a request message.

outputProcessor - the output MessageGroupProcessor.

correlationStrategy - the correlation strategy.

Since:

5.4

Method Details

setDiscardChannelName

public void setDiscardChannelName(String discardChannelName)

Set the name of the channel to which late arriving trigger messages are sent.

Parameters:

discardChannelName - the discard channel.

Since:

5.0

setDiscardChannel

public void setDiscardChannel(MessageChannel discardChannel)

Set the channel to which late arriving trigger messages are sent.

Parameters:

discardChannel - the discard channel.

Since:

5.0

getDiscardChannel

public MessageChannel getDiscardChannel()

Description copied from interface: DiscardingMessageHandler

Return the discard channel.

Specified by:

getDiscardChannel in interface DiscardingMessageHandler

Returns:

the channel.

Since:

5.0

getComponentType

public String getComponentType()

Description copied from class: IntegrationObjectSupport

Subclasses may implement this method to provide component type information.

Specified by:

getComponentType in interface NamedComponent

Overrides:

getComponentType in class MessageHandlerSupport

getIntegrationPatternType

public IntegrationPatternType getIntegrationPatternType()

Description copied from interface: IntegrationPattern

Return a pattern type this component implements.

Specified by:

getIntegrationPatternType in interface IntegrationPattern

Overrides:

getIntegrationPatternType in class AbstractReplyProducingMessageHandler

Returns:

the IntegrationPatternType this component implements.

handleRequestMessage

protected Object handleRequestMessage(Message<?> requestMessage)

Description copied from class: AbstractReplyProducingMessageHandler

Subclasses must implement this method to handle the request Message. The return value may be a Message, a MessageBuilder, or any plain Object. The base class will handle the final creation of a reply Message from any of those starting points. If the return value is null, the Message flow will end here.

Specified by:

handleRequestMessage in class AbstractReplyProducingMessageHandler

Parameters:

requestMessage - The request message.

Returns:

The result of handling the message, or null.

buildResult

protected Object buildResult(Object key,
 Message<?> requestMessage,
 Message<?> releaseMessage)

Override to change the default mechanism by which the inbound and release messages are returned as a result.

Parameters:

key - The correlation key.

requestMessage - the inbound message.

releaseMessage - the release message.

Returns:

the result.

trigger

public void trigger(Message<?> message)

Description copied from interface: MessageTriggerAction

Take some action based on the message.

Specified by:

trigger in interface MessageTriggerAction

Parameters:

message - the message.