/*
* Copyright 2011 The Netty Project
*
* The Netty Project 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 org.jboss.netty.channel;
/**
* A {@link ChannelHandler} that is notified when it is added to or removed
* from a {@link ChannelPipeline}.
*
* <h3>Invalid access to the {@link ChannelHandlerContext}</h3>
*
* Calling {@link ChannelHandlerContext#sendUpstream(ChannelEvent)} or
* {@link ChannelHandlerContext#sendDownstream(ChannelEvent)} in
* {@link #beforeAdd(ChannelHandlerContext)} or {@link #afterRemove(ChannelHandlerContext)}
* might lead to an unexpected behavior. It is because the context object
* might not have been fully added to the pipeline or the context object is not
* a part of the pipeline anymore respectively.
*/
public interface LifeCycleAwareChannelHandler extends ChannelHandler {
void beforeAdd(ChannelHandlerContext ctx) throws Exception;
void afterAdd(ChannelHandlerContext ctx) throws Exception;
void beforeRemove(ChannelHandlerContext ctx) throws Exception;
void afterRemove(ChannelHandlerContext ctx) throws Exception;
}