Package org.axonframework.messaging

Interface MessageHandler<T extends Message<?>>

Type Parameters:

T - The message type this handler can process

All Known Subinterfaces:

CommandMessageHandler, EventMessageHandler, Saga<T>

All Known Implementing Classes:

AggregateAnnotationCommandHandler, AnnotatedSaga, AnnotationCommandHandlerAdapter, AnnotationEventHandlerAdapter, AnnotationQueryHandlerAdapter, EventValidator

public interface MessageHandler<T extends Message<?>>

Interface for a component that processes Messages.

Since:

3.0

Author:

Rene de Waele

Method Summary

Modifier and Type	Method	Description
default boolean	canHandle(T message)	Indicates whether this handler can handle the given message
default boolean	canHandleType(Class<?> payloadType)	Indicates whether this handler can handle messages of given type
default Class<?>	getTargetType()	Returns the instance type that this handler delegates to.
Object	handle(T message)	Handles the given message.

Method Details

handle

Object handle(T message)
       throws Exception

Handles the given message.

Parameters:

message - The message to be processed.

Returns:

The result of the message processing.

Throws:

Exception - any exception that occurs during message handling

canHandle

default boolean canHandle(T message)

Indicates whether this handler can handle the given message

Parameters:

message - The message to verify

Returns:

true if this handler can handle the message, otherwise false

getTargetType

default Class<?> getTargetType()

Returns the instance type that this handler delegates to.

Returns:

Returns the instance type that this handler delegates to

canHandleType

default boolean canHandleType(Class<?> payloadType)

Indicates whether this handler can handle messages of given type

Parameters:

payloadType - The payloadType to verify

Returns:

true if this handler can handle the payloadType, otherwise false