org.axonframework.commandhandling

Class FailingDuplicateCommandHandlerResolver

java.lang.Object

org.axonframework.commandhandling.FailingDuplicateCommandHandlerResolver

All Implemented Interfaces:

DuplicateCommandHandlerResolver

public class FailingDuplicateCommandHandlerResolver
extends Object
implements DuplicateCommandHandlerResolver

Implementation of DuplicateCommandHandlerResolver that throws a DuplicateCommandHandlerSubscriptionException when a duplicate registration is detected.

Since:

4.2

Author:

Allard Buijze

Method Summary

Modifier and Type	Method and Description
static FailingDuplicateCommandHandlerResolver	instance() Returns a DuplicateCommandHandlerResolver that throws an exception when a duplicate registration is detected
MessageHandler<? super CommandMessage<?>>	resolve(String commandName, MessageHandler<? super CommandMessage<?>> registeredHandler, MessageHandler<? super CommandMessage<?>> candidateHandler) Chooses what to do when a duplicate handler is registered, returning the handler that should be selected for command handling, or otherwise throwing an exception to reject registration altogether.

Methods inherited from class java.lang.Object

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

Method Detail

instance

public static FailingDuplicateCommandHandlerResolver instance()

Returns a DuplicateCommandHandlerResolver that throws an exception when a duplicate registration is detected

Returns:

a DuplicateCommandHandlerResolver that throws an exception when a duplicate registration is detected

resolve

public MessageHandler<? super CommandMessage<?>> resolve(@Nonnull
                                                         String commandName,
                                                         @Nonnull
                                                         MessageHandler<? super CommandMessage<?>> registeredHandler,
                                                         @Nonnull
                                                         MessageHandler<? super CommandMessage<?>> candidateHandler)

Description copied from interface: DuplicateCommandHandlerResolver

Chooses what to do when a duplicate handler is registered, returning the handler that should be selected for command handling, or otherwise throwing an exception to reject registration altogether.

Specified by:

resolve in interface DuplicateCommandHandlerResolver

Parameters:

commandName - The name of the Command for which the duplicate was detected

registeredHandler - the MessageHandler previously registered with the Command Bus

candidateHandler - the MessageHandler that is newly registered and conflicts with the existing registration

Returns:

the resolved MessageHandler. Could be the registeredHandler, the candidateHandler or another handler entirely