io.netty.channel.CombinedChannelDuplexHandler Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).
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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 io.netty.channel;

import java.net.SocketAddress;

/**
 *  Combines a {@link ChannelInboundHandler} and a {@link ChannelOutboundHandler} into one {@link ChannelHandler}.
 *
 */
public class CombinedChannelDuplexHandler
        extends ChannelDuplexHandler {

    private I inboundHandler;
    private O outboundHandler;

    /**
     * Creates a new uninitialized instance. A class that extends this handler must invoke
     * {@link #init(ChannelInboundHandler, ChannelOutboundHandler)} before adding this handler into a
     * {@link ChannelPipeline}.
     */
    protected CombinedChannelDuplexHandler() { }

    /**
     * Creates a new instance that combines the specified two handlers into one.
     */
    public CombinedChannelDuplexHandler(I inboundHandler, O outboundHandler) {
        init(inboundHandler, outboundHandler);
    }

    /**
     * Initialized this handler with the specified handlers.
     *
     * @throws IllegalStateException if this handler was not constructed via the default constructor or
     *                               if this handler does not implement all required handler interfaces
     * @throws IllegalArgumentException if the specified handlers cannot be combined into one due to a conflict
     *                                  in the type hierarchy
     */
    protected final void init(I inboundHandler, O outboundHandler) {
        validate(inboundHandler, outboundHandler);
        this.inboundHandler = inboundHandler;
        this.outboundHandler = outboundHandler;
    }

    private void validate(I inboundHandler, O outboundHandler) {
        if (this.inboundHandler != null) {
            throw new IllegalStateException(
                    "init() can not be invoked if " + CombinedChannelDuplexHandler.class.getSimpleName() +
                            " was constructed with non-default constructor.");
        }

        if (inboundHandler == null) {
            throw new NullPointerException("inboundHandler");
        }
        if (outboundHandler == null) {
            throw new NullPointerException("outboundHandler");
        }
        if (inboundHandler instanceof ChannelOutboundHandler) {
            throw new IllegalArgumentException(
                    "inboundHandler must not implement " +
                    ChannelOutboundHandler.class.getSimpleName() + " to get combined.");
        }
        if (outboundHandler instanceof ChannelInboundHandler) {
            throw new IllegalArgumentException(
                    "outboundHandler must not implement " +
                    ChannelInboundHandler.class.getSimpleName() + " to get combined.");
        }
    }

    protected final I inboundHandler() {
        return inboundHandler;
    }

    protected final O outboundHandler() {
        return outboundHandler;
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        if (inboundHandler == null) {
            throw new IllegalStateException(
                    "init() must be invoked before being added to a " + ChannelPipeline.class.getSimpleName() +
                            " if " +  CombinedChannelDuplexHandler.class.getSimpleName() +
                            " was constructed with the default constructor.");
        }
        try {
            inboundHandler.handlerAdded(ctx);
        } finally {
            outboundHandler.handlerAdded(ctx);
        }
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        try {
            inboundHandler.handlerRemoved(ctx);
        } finally {
            outboundHandler.handlerRemoved(ctx);
        }
    }

    @Override
    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
        inboundHandler.channelRegistered(ctx);
    }

    @Override
    public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
        inboundHandler.channelUnregistered(ctx);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        inboundHandler.channelActive(ctx);
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        inboundHandler.channelInactive(ctx);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        inboundHandler.exceptionCaught(ctx, cause);
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        inboundHandler.userEventTriggered(ctx, evt);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        inboundHandler.channelRead(ctx, msg);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        inboundHandler.channelReadComplete(ctx);
    }

    @Override
    public void bind(
            ChannelHandlerContext ctx,
            SocketAddress localAddress, ChannelPromise promise) throws Exception {
        outboundHandler.bind(ctx, localAddress, promise);
    }

    @Override
    public void connect(
            ChannelHandlerContext ctx,
            SocketAddress remoteAddress, SocketAddress localAddress,
            ChannelPromise promise) throws Exception {
        outboundHandler.connect(ctx, remoteAddress, localAddress, promise);
    }

    @Override
    public void disconnect(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
        outboundHandler.disconnect(ctx, promise);
    }

    @Override
    public void close(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
        outboundHandler.close(ctx, promise);
    }

    @Override
    public void deregister(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
        outboundHandler.deregister(ctx, promise);
    }

    @Override
    public void read(ChannelHandlerContext ctx) throws Exception {
        outboundHandler.read(ctx);
    }

    @Override
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
        outboundHandler.write(ctx, msg, promise);
    }

    @Override
    public void flush(ChannelHandlerContext ctx) throws Exception {
        outboundHandler.flush(ctx);
    }

    @Override
    public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
        inboundHandler.channelWritabilityChanged(ctx);
    }
}