40 lines
1.7 KiB
Java
40 lines
1.7 KiB
Java
/*
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* Copyright 2009 Red Hat, Inc.
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*
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* Red Hat licenses this file to you under the Apache License, version 2.0
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* (the "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.channel;
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/**
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* A {@link ChannelHandler} that is notified when it is added to or removed
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* from a {@link ChannelPipeline}.
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*
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* <h3>Invalid access to the {@link ChannelHandlerContext}</h3>
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*
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* Calling {@link ChannelHandlerContext#sendUpstream(ChannelEvent)} or
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* {@link ChannelHandlerContext#sendDownstream(ChannelEvent)} in
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* {@link #beforeAdd(ChannelHandlerContext)} or {@link #afterRemove(ChannelHandlerContext)}
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* might lead to an unexpected behavior. It is because the context object
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* might not have been fully added to the pipeline or the context object is not
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* a part of the pipeline anymore respectively.
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*
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* @author <a href="http://netty.io/">The Netty Project</a>
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* @author <a href="http://gleamynode.net/">Trustin Lee</a>
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*/
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public interface LifeCycleAwareChannelHandler extends ChannelHandler {
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void beforeAdd(ChannelHandlerContext ctx) throws Exception;
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void afterAdd(ChannelHandlerContext ctx) throws Exception;
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void beforeRemove(ChannelHandlerContext ctx) throws Exception;
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void afterRemove(ChannelHandlerContext ctx) throws Exception;
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}
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