org.axonframework.commandhandling.annotation

Class AnnotationCommandHandlerAdapter

java.lang.Object

org.axonframework.commandhandling.annotation.AnnotationCommandHandlerAdapter

All Implemented Interfaces:

CommandHandler<Object>, Subscribable

public class AnnotationCommandHandlerAdapter
extends Object
implements CommandHandler<Object>, Subscribable

Adapter that turns any @CommandHandler annotated bean into a CommandHandler implementation. Each annotated method is subscribed as a CommandHandler at the CommandBus for the command type specified by the parameter of that method.

Since:

0.5

Author:

Allard Buijze

See Also:

CommandHandler

Constructor Summary

Constructors

Constructor and Description
AnnotationCommandHandlerAdapter(Object target, CommandBus commandBus) Initialize the command handler adapter for the given target which is to be subscribed with the given commandBus.

Method Summary

Methods

Modifier and Type	Method and Description
Object	handle(CommandMessage<Object> command, UnitOfWork unitOfWork) Invokes the @CommandHandler annotated method that accepts the given command.
void	subscribe() Subscribe the command handlers to the command bus assigned during the initialization.
static AnnotationCommandHandlerAdapter	subscribe(Object annotatedCommandHandler, CommandBus commandBus) Subscribe the annotated command handler to the given command bus.
void	unsubscribe() Unsubscribe the command handlers from the command bus assigned during the initialization.

Methods inherited from class java.lang.Object

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

Constructor Detail

AnnotationCommandHandlerAdapter

public AnnotationCommandHandlerAdapter(Object target,
                               CommandBus commandBus)

Initialize the command handler adapter for the given target which is to be subscribed with the given commandBus.

Note that you need to call subscribe() to actually subscribe the command handlers to the command bus.

Parameters:

target - The object containing the @CommandHandler annotated methods

commandBus - The command bus to which the handlers must be subscribed

Method Detail

subscribe

public static AnnotationCommandHandlerAdapter subscribe(Object annotatedCommandHandler,
                                        CommandBus commandBus)

Subscribe the annotated command handler to the given command bus.

Parameters:

annotatedCommandHandler - The annotated command handler that is to be subscribed to the command bus

commandBus - The command bus that gets the handler's subscription

Returns:

the Adapter created for the command handler target. Can be used to unsubscribe.

handle

public Object handle(CommandMessage<Object> command,
            UnitOfWork unitOfWork)
              throws Throwable

Invokes the @CommandHandler annotated method that accepts the given command.

Specified by:

handle in interface CommandHandler<Object>

Parameters:

command - The command to handle

unitOfWork - The UnitOfWork the command is processed in

Returns:

the result of the command handling. Is null when the annotated handler has a void return value.

Throws:

NoHandlerForCommandException - when no handler is found for given command.

Throwable - any exception occurring while handling the command

subscribe

@PostConstruct
public void subscribe()

Subscribe the command handlers to the command bus assigned during the initialization. A subscription is made with the command bus for each accepted type of command.

Specified by:

subscribe in interface Subscribable

unsubscribe

@PreDestroy
public void unsubscribe()

Unsubscribe the command handlers from the command bus assigned during the initialization.

Specified by:

unsubscribe in interface Subscribable