/**
* Copyright 2007 Bushe Enterprises, Inc., Hopkinton, MA, USA, www.bushe.com
*
* Licensed 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 org.bushe.swing.event;
import org.bushe.swing.event.annotation.ReferenceStrength;
/**
* An interface that can be implemented when proxies are used for subscription, not needed in normal usage. When an
* unsubscribe method is called on an EventService, the EventService is required to check if any of subscribed objects
* are ProxySubscribers and if the object to be unsubscribed is the ProxySubscriber's proxiedSubscriber. If so, the
* EventService proxy is unsubscribed and the ProxySubscriber's proxyUnsubscribed() method is called to allow the proxy
* to perform any cleanup if necessary. ProxySubscribers should set their references to their proxied objects to null
* for strong subscriptions to allow garbage collection.
*
* @author Michael Bushe
*/
public interface ProxySubscriber {
/** @return the object this proxy is subscribed on behalf of */
public Object getProxiedSubscriber();
/**
* Called by EventServices to inform the proxy that it is unsubscribed. The ProxySubscriber should null the
* reference to it's proxied subscriber
*/
public void proxyUnsubscribed();
/**
* @return the reference strength from this proxy to the proxied subscriber
*/
public ReferenceStrength getReferenceStrength();
}