/*
* Copyright 2010-2013 Ning, Inc.
*
* Ning licenses this file to you under the Apache License, version 2.0
* (the "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package com.ning.billing.beatrix.bus.api;
/**
* The interface {@code ExternalBus} represents the bus on which Killbill users can register handlers
* to receive notifications when change happen in the system
*/
public interface ExternalBus {
/**
* Registers a callback.
*
* @param handlerInstance the handler that will be called back by the system when something changed
*/
public void register(final Object handlerInstance); /* throws EventBusException */
/**
* Unregister a callback.
*
* @param handlerInstance the handler that was previously registered
*/
public void unregister(final Object handlerInstance); /* throws EventBusException */
}