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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 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}.
 *
 * Invalid access to the {@link ChannelHandlerContext}
 *
 * 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;
}