Class AbstractAggregatingMessageGroupProcessor
java.lang.Object
org.springframework.integration.aggregator.AbstractAggregatingMessageGroupProcessor
- All Implemented Interfaces:
Aware
,BeanFactoryAware
,MessageGroupProcessor
- Direct Known Subclasses:
DefaultAggregatingMessageGroupProcessor
,ExpressionEvaluatingMessageGroupProcessor
,FileAggregatingMessageGroupProcessor
,MethodInvokingMessageGroupProcessor
public abstract class AbstractAggregatingMessageGroupProcessor extends Object implements MessageGroupProcessor, BeanFactoryAware
Base class for MessageGroupProcessor implementations that aggregate the group of Messages into a single Message.
- Since:
- 2.0
- Author:
- Iwein Fuld, Alexander Peters, Mark Fisher, Dave Syer, Gary Russell, Artem Bilan
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Field Summary
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Constructor Summary
Constructors Constructor Description AbstractAggregatingMessageGroupProcessor()
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Method Summary
Modifier and Type Method Description protected Map<String,Object>
aggregateHeaders(MessageGroup group)
This default implementation simply returns all headers that have no conflicts among the group.protected abstract Object
aggregatePayloads(MessageGroup group, Map<String,Object> defaultHeaders)
protected Function<MessageGroup,Map<String,Object>>
getHeadersFunction()
protected MessageBuilderFactory
getMessageBuilderFactory()
Object
processMessageGroup(MessageGroup group)
Process the given MessageGroup.void
setBeanFactory(BeanFactory beanFactory)
void
setHeadersFunction(Function<MessageGroup,Map<String,Object>> headersFunction)
Specify aFunction
to mapMessageGroup
into composed headers for output message.
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Field Details
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Constructor Details
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AbstractAggregatingMessageGroupProcessor
public AbstractAggregatingMessageGroupProcessor()
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Method Details
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setBeanFactory
- Specified by:
setBeanFactory
in interfaceBeanFactoryAware
- Throws:
BeansException
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setHeadersFunction
Specify aFunction
to mapMessageGroup
into composed headers for output message.- Parameters:
headersFunction
- theFunction
to use.- Since:
- 5.2
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getHeadersFunction
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getMessageBuilderFactory
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processMessageGroup
Description copied from interface:MessageGroupProcessor
Process the given MessageGroup. Implementations are free to return as few or as many messages based on the invocation as needed. For example an aggregating processor will return only a single message representing the group, while a resequencing processor will return all messages whose preceding sequence has been satisfied.If a multiple messages are returned the return value must be a Collection<Message>.
- Specified by:
processMessageGroup
in interfaceMessageGroupProcessor
- Parameters:
group
- The message group.- Returns:
- The result of processing the group.
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aggregateHeaders
This default implementation simply returns all headers that have no conflicts among the group. An absent header on one or more Messages within the group is not considered a conflict. Subclasses may override this method with more advanced conflict-resolution strategies if necessary.- Parameters:
group
- The message group.- Returns:
- The aggregated headers.
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aggregatePayloads
protected abstract Object aggregatePayloads(MessageGroup group, Map<String,Object> defaultHeaders)
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