org.axonframework.queryhandling.registration

Class DuplicateQueryHandlerResolution

java.lang.Object

org.axonframework.queryhandling.registration.DuplicateQueryHandlerResolution

public abstract class DuplicateQueryHandlerResolution
extends Object

Enumeration describing a set of reasonable DuplicateQueryHandlerResolver implementations. Can be used to configure how a QueryBus should react upon a duplicate subscription of a query handling function.

Since:

4.6.0

Author:

Mitchell Herrijgers

Method Summary

Modifier and Type	Method and Description
static DuplicateQueryHandlerResolver	logAndAccept() A DuplicateQueryHandlerResolver implementation which logs a warning message and resolve to returning both handlers as query handlers.
static DuplicateQueryHandlerResolver	rejectDuplicates() A DuplicateQueryHandlerResolver implementation which throws a DuplicateQueryHandlerSubscriptionException.
static DuplicateQueryHandlerResolver	silentlyAdd() A DuplicateQueryHandlerResolver implementation that allows handlers to silently add previous registered handlers for the same query.

Methods inherited from class java.lang.Object

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

Method Detail

logAndAccept

public static DuplicateQueryHandlerResolver logAndAccept()

A DuplicateQueryHandlerResolver implementation which logs a warning message and resolve to returning both handlers as query handlers.

Returns:

an instance that logs duplicates

rejectDuplicates

public static DuplicateQueryHandlerResolver rejectDuplicates()

A DuplicateQueryHandlerResolver implementation which throws a DuplicateQueryHandlerSubscriptionException.

Returns:

an instance that fails on duplicate registrations

silentlyAdd

public static DuplicateQueryHandlerResolver silentlyAdd()

A DuplicateQueryHandlerResolver implementation that allows handlers to silently add previous registered handlers for the same query.

Returns:

an instance that silently add duplicates, adding both to the bus