org.axonframework.commandhandling

Class AnnotationCommandHandlerAdapter

java.lang.Object

org.axonframework.commandhandling.AnnotationCommandHandlerAdapter

All Implemented Interfaces:

SupportedCommandNamesAware, MessageHandler<CommandMessage<?>>

public class AnnotationCommandHandlerAdapter
extends Object
implements MessageHandler<CommandMessage<?>>, SupportedCommandNamesAware

Adapter that turns any @CommandHandler annotated bean into a MessageHandler 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 annotatedCommandHandler) Wraps the given annotatedCommandHandler, allowing it to be subscribed to a Command Bus.
AnnotationCommandHandlerAdapter(Object annotatedCommandHandler, ParameterResolverFactory parameterResolverFactory) Wraps the given annotatedCommandHandler, allowing it to be subscribed to a Command Bus.

Method Summary

Modifier and Type	Method and Description
Object	handle(CommandMessage<?> command) Invokes the @CommandHandler annotated method that accepts the given command.
Registration	subscribe(CommandBus commandBus) Subscribe this command handler to the given commandBus.
Set<String>	supportedCommandNames() Returns the set of command names this component supports.

Methods inherited from class java.lang.Object

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

Constructor Detail

AnnotationCommandHandlerAdapter

public AnnotationCommandHandlerAdapter(Object annotatedCommandHandler)

Wraps the given annotatedCommandHandler, allowing it to be subscribed to a Command Bus.

Parameters:

annotatedCommandHandler - The object containing the @CommandHandler annotated methods

AnnotationCommandHandlerAdapter

public AnnotationCommandHandlerAdapter(Object annotatedCommandHandler,
                                       ParameterResolverFactory parameterResolverFactory)

Wraps the given annotatedCommandHandler, allowing it to be subscribed to a Command Bus.

Parameters:

annotatedCommandHandler - The object containing the @CommandHandler annotated methods

parameterResolverFactory - The strategy for resolving handler method parameter values

Method Detail

subscribe

public Registration subscribe(CommandBus commandBus)

Subscribe this command handler to the given commandBus. The command handler will be subscribed for each of the supported commands.

Parameters:

commandBus - The command bus instance to subscribe to

Returns:

A handle that can be used to unsubscribe

handle

public Object handle(CommandMessage<?> command)
              throws Exception

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

Specified by:

handle in interface MessageHandler<CommandMessage<?>>

Parameters:

command - The command to handle

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.

Exception - any exception occurring while handling the command

supportedCommandNames

public Set<String> supportedCommandNames()

Description copied from interface: SupportedCommandNamesAware

Returns the set of command names this component supports.

Specified by:

supportedCommandNames in interface SupportedCommandNamesAware

Returns:

the set of supported command names