dubbo学习笔记 十四 dubbo-remoting

学完那么多章了，终于到remoting了，相信大家也很熟悉了，再学了netty和rocketmq之后，dubbo的remoting 也很明显了

先看下dubbo的介绍

Transporter

看看是怎么定义交换的，两个接口 bind 根据URL和ChannelHandler 生成Server  connect 根据URL和ChannelHandler

@SPI("netty")public interface Transporter {    /**     * Bind a server.     *      * @see com.alibaba.dubbo.remoting.Transporters#bind(URL, Receiver, ChannelHandler)     * @param url server url     * @param handler     * @return server     * @throws RemotingException      */    @Adaptive({Constants.SERVER_KEY, Constants.TRANSPORTER_KEY})    Server bind(URL url, ChannelHandler handler) throws RemotingException;    /**     * Connect to a server.     *      * @see com.alibaba.dubbo.remoting.Transporters#connect(URL, Receiver, ChannelListener)     * @param url server url     * @param handler     * @return client     * @throws RemotingException      */    @Adaptive({Constants.CLIENT_KEY, Constants.TRANSPORTER_KEY})    Client connect(URL url, ChannelHandler handler) throws RemotingException;}

Endpoint

Client和Server都继承与Endpoint

/* * Copyright 1999-2011 Alibaba Group. *   * 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 com.alibaba.dubbo.remoting;import java.net.InetSocketAddress;import com.alibaba.dubbo.common.URL;/** * Endpoint. (API/SPI, Prototype, ThreadSafe) *  * @see com.alibaba.dubbo.remoting.Channel * @see com.alibaba.dubbo.remoting.Client * @see com.alibaba.dubbo.remoting.Server * @author william.liangf */public interface Endpoint {    /**     * get url.     *      * @return url     */    URL getUrl();    /**     * get channel handler.     *      * @return channel handler     */    ChannelHandler getChannelHandler();    /**     * get local address.     *      * @return local address.     */    InetSocketAddress getLocalAddress();        /**     * send message.     *      * @param message     * @throws RemotingException     */    void send(Object message) throws RemotingException;    /**     * send message.     *      * @param message     * @param sent 是否已发送完成     */    void send(Object message, boolean sent) throws RemotingException;    /**     * close the channel.     */    void close();        /**     * Graceful close the channel.     */    void close(int timeout);        /**     * is closed.     *      * @return closed     */    boolean isClosed();}

ChannelHandler

消息事件操作，里面都是对channel的操作

@SPIpublic interface ChannelHandler {    /**     * on channel connected.     *      * @param channel channel.     */    void connected(Channel channel) throws RemotingException;    /**     * on channel disconnected.     *      * @param channel channel.     */    void disconnected(Channel channel) throws RemotingException;    /**     * on message sent.     *      * @param channel channel.     * @param message message.     */    void sent(Channel channel, Object message) throws RemotingException;    /**     * on message received.     *      * @param channel channel.     * @param message message.     */    void received(Channel channel, Object message) throws RemotingException;    /**     * on exception caught.     *      * @param channel channel.     * @param exception exception.     */    void caught(Channel channel, Throwable exception) throws RemotingException;}

Codec2

序列化接口

@SPIpublic interface Codec2 {    @Adaptive({Constants.CODEC_KEY})    void encode(Channel channel, ChannelBuffer buffer, Object message) throws IOException;    @Adaptive({Constants.CODEC_KEY})    Object decode(Channel channel, ChannelBuffer buffer) throws IOException;    enum DecodeResult {        NEED_MORE_INPUT, SKIP_SOME_INPUT    }}

Dispatcher

定义channelHandler对Channel的操作，那些走线程池

@SPI(AllDispatcher.NAME)public interface Dispatcher {    /**     * dispatch the message to threadpool.     *      * @param handler     * @param url     * @return channel handler     */    @Adaptive({Constants.DISPATCHER_KEY, "dispather", "channel.handler"}) // 后两个参数为兼容旧配置    ChannelHandler dispatch(ChannelHandler handler, URL url);}