org.axonframework.messaging

Interface MessageHandlerInterceptor<T extends Message<?>>

Type Parameters:

T - The message type this interceptor can process

All Known Implementing Classes:

AnnotatedCommandHandlerInterceptor, BeanValidationInterceptor, CorrelationDataInterceptor, LoggingInterceptor, TransactionManagingInterceptor

public interface MessageHandlerInterceptor<T extends Message<?>>

Workflow interface that allows for customized message handler invocation chains. A MessageHandlerInterceptor can add customized behavior to message handler invocations, both before and after the invocation.

Since:

0.5

Author:

Allard Buijze

Method Summary

Modifier and Type	Method and Description
Object	handle(UnitOfWork<? extends T> unitOfWork, InterceptorChain interceptorChain) Invoked before a Message is handled by a designated MessageHandler.

Method Detail

handle

Object handle(UnitOfWork<? extends T> unitOfWork,
              InterceptorChain interceptorChain)
       throws Exception

Invoked before a Message is handled by a designated MessageHandler.

The interceptor is responsible for the continuation of the handling process by invoking the InterceptorChain.proceed() method on the given interceptorChain.

The given unitOfWork contains contextual information. Any information gathered by interceptors may be attached to the unitOfWork.

Interceptors are highly recommended not to change the type of the message handling result, as the dispatching component might expect a result of a specific type.

Parameters:

unitOfWork - The UnitOfWork that is processing the message

interceptorChain - The interceptor chain that allows this interceptor to proceed the dispatch process

Returns:

the result of the message handler. May have been modified by interceptors.

Throws:

Exception - any exception that occurs while handling the message