Package org.axonframework.messaging.core.annotation

Class AnnotatedMessageHandlingMemberDefinition

java.lang.Object

org.axonframework.messaging.core.annotation.AnnotatedMessageHandlingMemberDefinition

All Implemented Interfaces:

HandlerDefinition

public class AnnotatedMessageHandlingMemberDefinition
extends Object
implements HandlerDefinition

The default HandlerDefinition implementation in Axon. It implements the rules of annotated handlers used in all the different types of handlers in Axon.

For this implementation to recognize a handler method, it should be (meta)annotated with MessageHandler. It is recommended to meta-annotated members, and preconfigure the expected messageType. For example, and event handler should define @MessageHandler(messageType = EventMessage.class), indicating that this handler should only be invoked for EventMessages.

Use HandlerEnhancerDefinition to add extra behavior or information on top of handlers created by this definition.

Since:

3.0.0

Author:

Allard Buijze

See Also:

• HandlerEnhancerDefinition
• CommandHandler
• EventHandler

Constructor Summary

Constructors

Constructor	Description
AnnotatedMessageHandlingMemberDefinition()

Method Summary

Modifier and Type	Method	Description
<T> Optional<MessageHandlingMember<T>>	createHandler(Class<T> declaringType, Method method, ParameterResolverFactory parameterResolverFactory, Function<Object,MessageStream<?>> messageStreamResolver)	Create a MessageHandlingMember for the given method method.

Methods inherited from class java.lang.Object

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

Constructor Details

AnnotatedMessageHandlingMemberDefinition

public AnnotatedMessageHandlingMemberDefinition()

Method Details

createHandler

public <T> Optional<MessageHandlingMember<T>> createHandler(@Nonnull
 Class<T> declaringType,
 @Nonnull
 Method method,
 @Nonnull
 ParameterResolverFactory parameterResolverFactory,
 @Nonnull
 Function<Object,MessageStream<?>> messageStreamResolver)

Description copied from interface: HandlerDefinition

Create a MessageHandlingMember for the given method method. Use the given parameterResolverFactory to resolve the method's parameters.

Specified by:

createHandler in interface HandlerDefinition

Type Parameters:

T - The type of the declaring object

Parameters:

declaringType - The type of object declaring the given method

method - The method to inspect

parameterResolverFactory - Factory for a ParameterResolver of the method

messageStreamResolver - The lambda resolving a MessageStream out of the result from MessageHandlingMember.handle(Message, ProcessingContext, Object).

Returns:

An optional containing the handler if the method is suitable, or an empty Nullable otherwise.