Springベースの手書きRPCフレームワーク(3)通信プロトコルモジュール

29947 ワード

コードを書く前に、いくつかの問題をよく考えなければなりません.

私たちのフレームワークはいったいどんな機能を実現しますか?リモートコールのRPCプロトコルを実装します.

の最終的な実現効果はどのようなものですか?ローカル・サービスを呼び出すように、リモート・サービスを呼び出すことができます.

上記の効果をどのように実現しますか?前述の章では,動的エージェントを用いてクライアント生成インタフェースエージェントクラスで使用し,エージェントクラスのinvokeメソッドでメソッドパラメータなどの情報をrequestに組み立ててサービス側に送信し,サービス側はサーバがこのメッセージを受信するのをずっと待っている必要があり,受信後に反射呼び出し対応インタフェースの実装クラスを用いる.

まず、最下位の通信を実現するサービス側とクライアントが必要です.いくつかの実装があります.

Socketベースのクライアントとサービス側(同期ブロック式、推奨しない)は、プログラミングの練習として、システム全体と統合されず、純粋に練習して使用することができます.Socketベースのサービス・エンド.ブロック型socket serverを起動し、スレッドプールに追加して擬似非同期を実現します.

public class SocketServer {

     private static SocketServer INSTANCE = new SocketServer();

     private SocketServer(){};

     public static SocketServer getInstance() {
         return INSTANCE;
     }

     //              ，       Integer     ,        
     ExecutorService executorService = Executors.newCachedThreadPool();

     /**
      *     ,bio   
      * @param service
      * @param port
      */
     public void publiser(int port){
         try (ServerSocket serverSocket  = new ServerSocket(port);)
         {
             while (true){
                 Socket socket = serverSocket.accept();//    
                 executorService.execute(new SocketHandler(socket));
             }
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 }

対応のhanlderは、反射を使用して対応するサービスを呼び出し、sokcetを介して結果を書き込む.

public class SocketHandler implements Runnable{

     private Socket socket;

     public SocketHandler(Socket socket) {
         this.socket = socket;
     }

     @Override
     public void run() {
         try (ObjectInputStream inputStream = new ObjectInputStream(socket.getInputStream());
              ObjectOutputStream outputStream = new ObjectOutputStream(socket.getOutputStream());)
         {
             Object o = inputStream.readObject(); //readObject   java        
             System.out.println(o);
             Object result = invoke((RpcRequest) o);
             //    
             outputStream.writeObject(result);
             outputStream.flush();
         } catch (IOException e) {
             e.printStackTrace();
         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         }
     }

     private Object invoke(RpcRequest invocation){

         //            service      
         try {
             String interFaceName = invocation.getInterfaceName();
             Class impClass = Class.forName(invocation.getImpl());

             Method method = impClass.getMethod(invocation.getMethodName(),invocation.getParamTypes());
             String result = (String)method.invoke(impClass.newInstance(),invocation.getParams());
             return result;
         } catch (NoSuchMethodException e) {
             e.printStackTrace();
         } catch (IllegalAccessException e) {
             e.printStackTrace();
         } catch (InvocationTargetException e) {
             e.printStackTrace();
         } catch (InstantiationException e) {
             e.printStackTrace();
         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         }

         return null;
     }
 }

クライアントを見て、パラメータを組み立てて、socketサービス側に送信します.

public class SocketClient {

     private static SocketClient INSTANCE = new SocketClient();

     private SocketClient(){};

     public static SocketClient getInstance() {
         return INSTANCE;
     }

     private Socket newSocket(String host, Integer port) {
         System.out.println("       socket   ");
         try {
             Socket socket = new Socket(host, port);
             return socket;
         } catch (IOException e) {
             System.out.println("      ");
             e.printStackTrace();
         }
         return null;
     }

     public Object sendRequest(String host, Integer port,RpcRequest rpcRequest) {
         Socket socket = newSocket(host,port);
         try (
             ObjectOutputStream outputStream = new ObjectOutputStream(socket.getOutputStream());
             ObjectInputStream inputStream = new ObjectInputStream(socket.getInputStream());)
         {
             outputStream.writeObject(rpcRequest);
             outputStream.flush();


             Object result = inputStream.readObject();

             inputStream.close();
             outputStream.close();
             return result;

         } catch (Exception e) {
             e.printStackTrace();
         }
         return null;
     }
 }

上のコードを通じて、皆さんはすでにこの流れを理解したと信じています.クライアントとサービス側が通信する過程で、呼び出す必要がある方法のパラメータをサービス側に伝え、サービス側は反射を通じて呼び出しを完了し、最後に結果をクライアントに返します.これから本格的にスタートします.

Http要求に基づくクライアントおよびTomcatベースのサービス端末.Tomcatベースのサービス側、単一のモード、サービスを開始するstartメソッドが1つしかなく、傍受されたリクエストはDispatcherServeretで処理されます.

public class HttpServer {

     private static HttpServer INSTANCE = new HttpServer();

     private HttpServer(){}

     public static HttpServer getInstance(){
         return INSTANCE;
     }


     /**
      *
      * servlet   ，tomcat
      * @param hostname
      * @param port
      */

     public void start(String hostname,Integer port){

         Tomcat tomcat = new Tomcat();
         Server server = tomcat.getServer();
         Service service = server.findService("Tomcat");

         Connector connector = new Connector();
         connector.setPort(port);

         Engine engine = new StandardEngine();
         engine.setDefaultHost(hostname);

         Host host = new StandardHost();
         host.setName(hostname);

         String contextPath = "";
         Context context = new StandardContext();
         context.setPath(contextPath);
         context.addLifecycleListener(new Tomcat.FixContextListener()); //       

         host.addChild(context);
         engine.addChild(host);

         service.setContainer(engine);
         service.addConnector(connector);

         tomcat.addServlet(contextPath,"dispatcher", new DispatcherServlet());
         context.addServletMappingDecoded("/*","dispatcher");

         try {
             tomcat.start();
             tomcat.getServer().await();
         } catch (LifecycleException e) {
             e.printStackTrace();
         }
     }
 }

は、次に、要求配布器DispatcherServiceletの実装を見て、HttpServiceletHandler実装に要求を送信する.

/**
  * tomcat   servlet   ，    servlet
  *
  */
 public class DispatcherServlet extends HttpServlet {

     @Override
     protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
         new HttpServletHandler().handler(req,resp);
     }
 }

HttpServeretHandlerの実装は、実際にはrequestを解析し、反射呼び出しによって最終的に結果を返すことである.

public class HttpServletHandler{

     public void handler(HttpServletRequest req, HttpServletResponse resp) {

         try(InputStream inputStream = req.getInputStream();
             OutputStream outputStream =resp.getOutputStream();){
             ObjectInputStream ois = new ObjectInputStream(inputStream);
             RpcRequest invocation = (RpcRequest) ois.readObject();

             //          ，       
             String interFaceName = invocation.getInterfaceName();
             Class impClass = Class.forName(invocation.getImpl());


             Method method = impClass.getMethod(invocation.getMethodName(),invocation.getParamTypes());
             Object result = method.invoke(impClass.newInstance(),invocation.getParams());

             RpcResponse rpcResponse = new RpcResponse();
             rpcResponse.setResponseId(invocation.getRequestId());
             rpcResponse.setData(result);
             IOUtils.write(toByteArray(rpcResponse),outputStream);
         }catch (IOException e){
             e.printStackTrace();
         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         } catch (NoSuchMethodException e) {
             e.printStackTrace();
         } catch (IllegalAccessException e) {
             e.printStackTrace();
         } catch (InvocationTargetException e) {
             e.printStackTrace();
         } catch (InstantiationException e) {
             e.printStackTrace();
         }
     }

     public byte[] toByteArray (Object obj) {
         byte[] bytes = null;
         ByteArrayOutputStream bos = new ByteArrayOutputStream();
         try {
             ObjectOutputStream oos = new ObjectOutputStream(bos);
             oos.writeObject(obj);
             oos.flush();
             bytes = bos.toByteArray ();
             oos.close();
             bos.close();
         } catch (IOException ex) {
             ex.printStackTrace();
         }
         return bytes;
     }

 }

は最後にクライアントの実装を見てpost方法でデータを送信し、最後にサービス側が返した結果を解析する.

public class HttpClient {

     private static HttpClient INSTANCE = new HttpClient();

     private HttpClient(){}

     public static HttpClient getInstance(){
         return INSTANCE;
     }

     public Object post(String hostname, Integer port, RpcRequest invocation){

         try{
             URL url = new URL("http",hostname,port,"/");
             HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();

             httpURLConnection.setRequestMethod("POST");
             httpURLConnection.setDoOutput(true);

             OutputStream outputStream = httpURLConnection.getOutputStream();
             ObjectOutputStream oos = new ObjectOutputStream(outputStream);
             oos.writeObject(invocation);
             oos.flush();
             oos.close();

             InputStream inputStream = httpURLConnection.getInputStream();
             RpcResponse rpcResponse =  (RpcResponse)toObject(IOUtils.toByteArray(inputStream));
             return rpcResponse.getData();


         } catch (MalformedURLException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }
         return null;

     }

     public Object toObject (byte[] bytes) {
         Object obj = null;
         try {
             ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
             ObjectInputStream ois = new ObjectInputStream (bis);
             obj = ois.readObject();
             ois.close();
             bis.close();
         } catch (IOException ex) {
             ex.printStackTrace();
         } catch (ClassNotFoundException ex) {
             ex.printStackTrace();
         }
         return obj;
     }
 }

Nettyモデルのクライアントおよびサービス・エンド.Nettyのサービス端に基づいて、中のエンコーダとデコーダは私たちが自分で実現したので、皆さんはまず私が注釈した部分を使って、私たちがコードデコーダに書いたときに交換することができます.

public class NettyServer {

     private static NettyServer INSTANCE = new NettyServer();

     private static Executor executor = Executors.newCachedThreadPool();

     private final static int MESSAGE_LENGTH = 4;

     private NettyServer(){};

     public static NettyServer getInstance(){
         return INSTANCE;
     }


     private SerializeType serializeType = SerializeType.queryByType(Configuration.getInstance().getSerialize());

     public static void submit(Runnable t){
         executor.execute(t);
     }

     public void start(String host, Integer port){
         EventLoopGroup bossGroup = new NioEventLoopGroup(1);
         EventLoopGroup workerGroup = new NioEventLoopGroup();

         try{
             final ServerBootstrap bootstrap = new ServerBootstrap();
             bootstrap.group(bossGroup,workerGroup)
             .channel(NioServerSocketChannel.class)
             .option(ChannelOption.SO_BACKLOG, 128)
             .childOption(ChannelOption.SO_KEEPALIVE, true)
             .childHandler(new ChannelInitializer(){

                 @Override
                 protected void initChannel(SocketChannel arg0) throws Exception {
                     ChannelPipeline pipeline = arg0.pipeline();
                      //ObjectDecoder        LengthFieldBasedFrameDecoder         。       LengthFieldBasedFrameDecoder
                     //        super(maxObjectSize, 0, 4, 0, 4); 
 //                  pipeline.addLast(new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, NettyServer.MESSAGE_LENGTH, 0, NettyServer.MESSAGE_LENGTH));
                     //  LengthFieldPrepender    ObjectDecoder     
 //                  pipeline.addLast(new LengthFieldPrepender(NettyServer.MESSAGE_LENGTH));
 //                  pipeline.addLast(new ObjectEncoder());
                     //       ，  weakCachingConcurrentResolver    。      :cacheDisabled  
 //                  pipeline.addLast(new ObjectDecoder(Integer.MAX_VALUE, ClassResolvers.weakCachingConcurrentResolver(this.getClass().getClassLoader())));
                     //     NettyDecoderHandler
                     pipeline.addLast(new NettyDecoderHandler(RpcRequest.class, serializeType));
                     //     NettyEncoderHandler
                     pipeline.addLast(new NettyEncoderHandler(serializeType));
                     pipeline.addLast("handler", new NettyServerHandler());

                 }

             });
             Channel channel = bootstrap.bind(host, port).sync().channel();
             System.out.println("Server start listen at " + port);
         }catch(Exception e){
             bossGroup.shutdownGracefully();
             workerGroup.shutdownGracefully();
         }
     }


 }

サービス側に対応するhandler,nettyはいずれもこのhandlerモードであり,handlerの中でもこの受信したrequestをスレッドプールに入れて処理する.

    public class NettyServerHandler extends SimpleChannelInboundHandler {

     private ChannelHandlerContext context;


     @Override
     protected void channelRead0(ChannelHandlerContext ctx, RpcRequest rpcRequest) throws Exception {
         System.out.println("server channelRead...");
         System.out.println(ctx.channel().remoteAddress() + "->server:" + rpcRequest.toString());
         InvokeTask it = new InvokeTask(rpcRequest,ctx);
         NettyServer.submit(it);
     }


     @Override
     public void handlerAdded(ChannelHandlerContext ctx) throws Exception{
         this.context = ctx;     
     }

 }

は、InvokeTaskの対応する実装を与える.

public class InvokeTask implements Runnable{

     private RpcRequest invocation;
     private ChannelHandlerContext ctx;

     public InvokeTask(RpcRequest invocation,ChannelHandlerContext ctx) {
         super();
         this.invocation = invocation;
         this.ctx = ctx;
     }


     @Override
     public void run() {

         //          ，       
         String interFaceName = invocation.getInterfaceName();
         Class impClass = null;
         try {
             impClass = Class.forName(invocation.getImpl());
         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         }

         Method method;
         Object result = null;
         try {
             method = impClass.getMethod(invocation.getMethodName(),invocation.getParamTypes());
             //       ，       spring    
             result = method.invoke(impClass.newInstance(),invocation.getParams());
         } catch (Exception e) {
             e.printStackTrace();
         }
         RpcResponse rpcResponse = new RpcResponse();
         rpcResponse.setResponseId(invocation.getRequestId());
         rpcResponse.setData(result);
         ctx.writeAndFlush(rpcResponse).addListener(new ChannelFutureListener() {
             public void operationComplete(ChannelFuture channelFuture) throws Exception {
                 System.out.println("RPC Server Send message-id respone:" + invocation.getRequestId());
             }
         });

     }

 }

クライアントを見ると、クライアントには、handlerを多重化できない(connectionとしてすぐに使用できる)モードと、handlerを多重化できるhandlerPoolモードの2つの実装がある.多重化できないモード.

public class NettyClient {
     private static NettyClient INSTANCE = new NettyClient();

     private final static int parallel = Runtime.getRuntime().availableProcessors() * 2;

     private NettyClient(){};

     public static NettyClient getInstance(){
         return INSTANCE;
     }

     private SerializeType serializeType = SerializeType.queryByType(Configuration.getInstance().getSerialize());

     public void start(String host,Integer port){

         Bootstrap bootstrap = new Bootstrap();
         EventLoopGroup group = new NioEventLoopGroup(parallel);

         try{
             bootstrap.group(group)
                     .channel(NioSocketChannel.class)
                     .handler(new ChannelInitializer(){

                         @Override
                         protected void initChannel(SocketChannel arg0) throws Exception {
                             ChannelPipeline pipeline = arg0.pipeline();
                             //ObjectDecoder        LengthFieldBasedFrameDecoder         。       LengthFieldBasedFrameDecoder
                             //        super(maxObjectSize, 0, 4, 0, 4);
 //                          pipeline.addLast(new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4));
                             //  LengthFieldPrepender    ObjectDecoder     
 //                          pipeline.addLast(new LengthFieldPrepender(4));
 //                          pipeline.addLast(new ObjectEncoder());
                             //       ，  weakCachingConcurrentResolver    。      :cacheDisabled  
 //                          pipeline.addLast(new ObjectDecoder(Integer.MAX_VALUE, ClassResolvers.weakCachingConcurrentResolver(this.getClass().getClassLoader())));
                             //  Netty   
                             System.out.println("11111111:"+serializeType.getSerializeType());
                             pipeline.addLast(new NettyEncoderHandler(serializeType));
                             //  Netty   
                             pipeline.addLast(new NettyDecoderHandler(RpcResponse.class, serializeType));
                             pipeline.addLast("handler", new NettyClientHandler());

                         }

                     });
             ChannelFuture future = bootstrap.connect(host,port).sync();
         }catch(Exception e){
             group.shutdownGracefully();
         }


     }
 }

は多重化可能なモードを見て、handlerの数を固定して、現在のフレームワークの中で多重化可能なモードを使って、上の多重化不可能なのは役に立たないで、みんなに理解するために、削除していません.

public class NettyChannelPoolFactory {

     //   Netty Channel       ,        
     private static final int channelConnectSize = 10;

     //Key        ,value Netty Channel    
     private static final Map> channelPoolMap = new ConcurrentHashMap<>();

     private static NettyChannelPoolFactory INSTANCE = new NettyChannelPoolFactory();

     private NettyChannelPoolFactory(){};

     public static NettyChannelPoolFactory getInstance(){
         return INSTANCE;
     }

     private List serviceMetaDataList = new ArrayList<>();

     //                      channel
     public void initNettyChannelPoolFactory(Map> providerMap){

         //          serviceMetaDataList  
         Collection> collectionServiceMetaDataList = providerMap.values();
         for (List serviceMetaDataModels : collectionServiceMetaDataList) {
             if (CollectionUtils.isEmpty(serviceMetaDataModels)) {
                 continue;
             }
             serviceMetaDataList.addAll(serviceMetaDataModels);
         }

         //           
         Set set = new HashSet<>();
         for (ServiceProvider serviceMetaData : serviceMetaDataList) {
             String serviceIp = serviceMetaData.getIp();
             int servicePort = serviceMetaData.getPort();
             URL url = new URL(serviceIp,servicePort);
             set.add(url);
         }

         for(URL url:set){
             //    ip        channel，         
             int channelSize = 0;
             while(channelSize < channelConnectSize){
                 Channel channel = null;
                 while(channel == null){
                     channel = registerChannel(url);
                 }

                 channelSize ++;

                 ArrayBlockingQueue queue = channelPoolMap.get(url);
                 if(queue == null){
                     queue = new ArrayBlockingQueue(channelConnectSize);
                     channelPoolMap.put(url, queue);
                 }
                 queue.offer(channel);

             }
         }

     }

     public Channel registerChannel(URL url) {
         final SerializeType serializeType = SerializeType.queryByType(Configuration.getInstance().getSerialize());
         Bootstrap bootstrap = new Bootstrap();
         EventLoopGroup group = new NioEventLoopGroup(10);

         try{
             bootstrap.group(group)
                 .channel(NioSocketChannel.class)
                 .handler(new ChannelInitializer(){

                 @Override
                 protected void initChannel(SocketChannel arg0) throws Exception {
                     ChannelPipeline pipeline = arg0.pipeline();
                     //ObjectDecoder        LengthFieldBasedFrameDecoder         。       LengthFieldBasedFrameDecoder
                     //        super(maxObjectSize, 0, 4, 0, 4);
 //                  pipeline.addLast(new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4));
                     //  LengthFieldPrepender    ObjectDecoder     
 //                  pipeline.addLast(new LengthFieldPrepender(4));
 //                  pipeline.addLast(new ObjectEncoder());
                     //       ，  weakCachingConcurrentResolver    。      :cacheDisabled  
 //                  pipeline.addLast(new ObjectDecoder(Integer.MAX_VALUE, ClassResolvers.weakCachingConcurrentResolver(this.getClass().getClassLoader())));
                     pipeline.addLast(new NettyEncoderHandler(serializeType));
                     //  Netty   
                     pipeline.addLast(new NettyDecoderHandler(RpcResponse.class, serializeType));
                     pipeline.addLast("handler", new NettyClientHandler());

                 }

             });
             ChannelFuture future = bootstrap.connect(url.getHost(),url.getPort()).sync();
             Channel channel = future.channel();
             //  Netty           
             final CountDownLatch connectedLatch = new CountDownLatch(1);

             final List isSuccess = new ArrayList<>(1);
             future.addListener(new ChannelFutureListener(){

                 @Override
                 public void operationComplete(ChannelFuture future)
                         throws Exception {
                     if(future.isSuccess()){
                         isSuccess.add(true);
                     }else{
                         isSuccess.add(false);
                     }
                     connectedLatch.countDown();
                 }

             });
             connectedLatch.await();
             if(isSuccess.get(0)){
                 return channel;
             }
         }catch(Exception e){
             group.shutdownGracefully();
             e.printStackTrace();
         }
         return null;
     }
     //   url       
     public ArrayBlockingQueue acqiure(URL url){
         System.out.println(channelPoolMap.toString());
         return channelPoolMap.get(url);
     }

     //channel          
     public void release(ArrayBlockingQueue queue, Channel channel, URL url){
         if(queue == null){
             return;
         }
         //     channel     ，     ，             
         if(channel == null || !channel.isActive() || !channel.isOpen()|| !channel.isWritable()){
             if (channel != null) {
                 channel.deregister().syncUninterruptibly().awaitUninterruptibly();
                 channel.closeFuture().syncUninterruptibly().awaitUninterruptibly();
             }
             Channel c = null;
             while(c == null){
                 c = registerChannel(url);
             }
             queue.offer(c);
             return;
         }
         queue.offer(channel);
     }

 }

は対応するhandler実装を与え、channelread 0でserver側から返された情報を読み取る.nettyは非同期であるため、MessageCallBackが同期呼び出しを実現するために必要である.

public class NettyClientHandler extends SimpleChannelInboundHandler {

     private ChannelHandlerContext context;

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

     @Override
     public void channelInactive(ChannelHandlerContext ctx) throws Exception {
         System.out.println("     ："+new Date());
         System.out.println("HeartBeatClientHandler channelInactive");
     }

     @Override
     public void channelActive(ChannelHandlerContext ctx) throws Exception {
         this.context = ctx;
         System.out.println("     ："+ctx.channel().id());
     }


     @Override
     protected void channelRead0(ChannelHandlerContext channelHandlerContext, RpcResponse rpcResponse) throws Exception {
         // String res = (String)msg;
         //RpcResponse rpcResponse = (RpcResponse)msg;
         String responseId = rpcResponse.getResponseId();
         MessageCallBack callBack = ResponseHolder.getInstance().mapCallBack.get(responseId);
         if(callBack != null){
             ResponseHolder.getInstance().mapCallBack.remove(responseId);
             callBack.over(rpcResponse);
         }
     }
 }

MessageCallBackの実装.

public class MessageCallBack {

     private RpcRequest rpcRequest;

     private RpcResponse rpcResponse;

     private Lock lock = new ReentrantLock();

     private Condition finish = lock.newCondition();

     public MessageCallBack(RpcRequest request) {
         this.rpcRequest = request;
     }

     public Object start() throws InterruptedException {
         try {
             lock.lock();
             //        ，rpc           ，       。
             finish.await(10*1000, TimeUnit.MILLISECONDS);
             if (this.rpcResponse != null) {
                 return this.rpcResponse.getData();
             } else {
                 return null;
             }
         } finally {
             lock.unlock();
         }
     }

     public void over(RpcResponse reponse) {
         try {
             lock.lock();
             this.rpcResponse = reponse;
             finish.signal();
         } finally {
             lock.unlock();
         }
     }

 }

は挿抜可能なフレームワークである以上、下位プロトコルは必ず選択可能であるため、上位インタフェースを定義して選択プロトコルをサポートします.startメソッドはサービス側を起動し,sendメソッドはクライアントがデータを送信する.

public interface Procotol {

     void start(URL url);
     Object send(URL url, RpcRequest invocation);
 }

に対応する3つのプロトコルのインタフェースが実装される.Nettyの実装

public class DubboProcotol implements Procotol {
     @Override
     public void start(URL url) {
         NettyServer nettyServer = NettyServer.getInstance();
         nettyServer.start(url.getHost(),url.getPort());
     }

     @Override
     public Object send(URL url, RpcRequest invocation) {
         ArrayBlockingQueue queue = NettyChannelPoolFactory.getInstance().acqiure(url);
         Channel channel = null;
         try {
             channel = queue.poll(invocation.getTimeout(), TimeUnit.MILLISECONDS);
             if(channel == null || !channel.isActive() || !channel.isOpen()|| !channel.isWritable()){
                 channel = queue.poll(invocation.getTimeout(), TimeUnit.MILLISECONDS);
                 if(channel == null){
                     channel = NettyChannelPoolFactory.getInstance().registerChannel(url);
                 }
             }
             //          Netty  ,      
             ChannelFuture channelFuture = channel.writeAndFlush(invocation);
             channelFuture.syncUninterruptibly();
             MessageCallBack callback = new MessageCallBack(invocation);
             ResponseHolder.getInstance().mapCallBack.put(invocation.getRequestId(), callback);
             try {
                 return callback.start();
             } catch (InterruptedException e) {
                 e.printStackTrace();
             }
             return null;
         } catch (InterruptedException e1) {
             e1.printStackTrace();
         }finally{
             System.out.println("release:"+channel.id());
             NettyChannelPoolFactory.getInstance().release(queue, channel, url);
         }
         return null;
     }
 }

httpの実装

public class HttpProcotol implements Procotol {
     @Override
     public void start(URL url) {
         HttpServer httpServer = HttpServer.getInstance();
         httpServer.start(url.getHost(),url.getPort());
     }

     @Override
     public Object send(URL url, RpcRequest invocation) {
         HttpClient httpClient = HttpClient.getInstance();
         return httpClient.post(url.getHost(),url.getPort(),invocation);
     }
 }

Socketの実装

public class SocketProcotol implements Procotol {
     @Override
     public void start(URL url) {
         SocketServer socketServer = SocketServer.getInstance();
         socketServer.publiser(url.getPort());
     }

     @Override
     public Object send(URL url, RpcRequest invocation) {
         SocketClient socketClient = SocketClient.getInstance();
         return socketClient.sendRequest(url.getHost(),url.getPort(),invocation);
     }
 }

という選択可能なプロトコルのモデルが実装され、このモジュールを介してプロトコルを選択し、サービス側と通信することができる.

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