Examples of hudson.remoting.Channel

hudson.remoting.Channel
Represents a communication channel to the remote peer.

A {@link Channel} is a mechanism for two JVMs to communicate overbi-directional {@link InputStream}/ {@link OutputStream} pair.{@link Channel} represents an endpoint of the stream, and thustwo {@link Channel}s are always used in a pair.

Communication is established as soon as two {@link Channel} instancesare created at the end fo the stream pair until the stream is terminated via {@link #close()}.

The basic unit of remoting is an executable {@link Callable} object.An application can create a {@link Callable} object, and execute it remotelyby using the {@link #call(Callable)} method or {@link #callAsync(Callable)} method.

In this sense, {@link Channel} is a mechanism to delegate/offload computationto other JVMs and somewhat like an agent system. This is bit different from remoting technologies like CORBA or web services, where the server exposes a certain functionality that clients invoke.

{@link Callable} object, as well as the return value / exceptions,are transported by using Java serialization. All the necessary class files are also shipped over {@link Channel} on-demand, so there's no need topre-deploy such classes on both JVMs.

Implementor's Note

{@link Channel} builds its features in a layered model. Its higher-layerfeatures are built on top of its lower-layer features, and they are called layer-0, layer-1, etc.
- Layer 0: See {@link Command} for more details. This is for higher-level features,and not likely useful for applications directly.
- Layer 1: See {@link Request} for more details. This is for higher-level features,and not likely useful for applications directly.
@author Kohsuke Kawaguchi, Winston Prakash (bug fixes)

            if(computer==null) {
                error(out, "No such slave: "+nodeName);
                return;
            }


            Channel ch = computer.getChannel();
            if(ch !=null) {
                String c = request.getProperty("Cookie");
                if (c!=null && c.equals(ch.getProperty(COOKIE_NAME))) {
                    // we think we are currently connected, but this request proves that it's from the party
                    // we are supposed to be communicating to. so let the current one get disconnected
                    LOGGER.info("Disconnecting "+nodeName+" as we are reconnected from the current peer");
                    try {
                        computer.disconnect(new ConnectionFromCurrentPeer()).get(15, TimeUnit.SECONDS);
                    } catch (ExecutionException e) {
                        throw new IOException2("Failed to disconnect the current client",e);
                    } catch (TimeoutException e) {
                        throw new IOException2("Failed to disconnect the current client",e);
                    }
                } else {
                    error(out, nodeName + " is already connected to this master. Rejecting this connection.");
                    return;
                }
            }


            out.println(Engine.GREETING_SUCCESS);


            Properties response = new Properties();
            String cookie = generateCookie();
            response.put("Cookie",cookie);
            writeResponseHeaders(out, response);


            ch = jnlpConnect(computer);


            ch.setProperty(COOKIE_NAME, cookie);
        }

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            final Process proc = pb.start();


            final Thread t2 = new StreamCopyThread(pb.command()+": stderr copier", proc.getErrorStream(), out);
            t2.start();


            return new Channel("locally launched channel on "+ pb.command(),
                Computer.threadPoolForRemoting, proc.getInputStream(), proc.getOutputStream(), out) {


                /**
                 * Kill the process when the channel is severed.
                 */

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            Pipe out = Pipe.createRemoteToLocal();
            final String workDir = _workDir==null ? null : _workDir.getRemote();


            OutputStream os = getChannel().call(new RemoteChannelLaunchCallable(cmd, out, err, workDir, envOverrides));


            return new Channel("remotely launched channel on "+channel,
                Computer.threadPoolForRemoting, out.getIn(), new BufferedOutputStream(os));
        }

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            @Override
            public SVNSSHAuthentication createSVNAuthentication(String kind) throws SVNException {
                if(kind.equals(ISVNAuthenticationManager.SSH)) {
                    try {
                        Channel channel = Channel.current();
                        String privateKey;
                        if(channel!=null) {
                            // remote
                            privateKey = channel.call(new Callable<String,IOException>() {
                                /**
                                 *
                                 */
                                private static final long serialVersionUID = -3088632649290496373L;

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    public static void syncWorkspaceFormatFromMaster() {
        Hudson h = Hudson.getInstance();
        if (h!=null)
            workspaceFormat = h.getDescriptorByType(SubversionSCM.DescriptorImpl.class).getWorkspaceFormat();
        else {
            Channel c = Channel.current();
            if (c!=null)    // just being defensive. cannot be null.
                try {
                    workspaceFormat = c.call(new Callable<Integer, RuntimeException>() {
                        private static final long serialVersionUID = 6494337549896104453L;


                        public Integer call()  {
                            return Hudson.getInstance().getDescriptorByType(SubversionSCM.DescriptorImpl.class).getWorkspaceFormat();
                        }

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     * When sent to the remote node, send a proxy.
     */
    private Object writeReplace() {
        if (IS_SAVING.get()!=null)  return this;
        
        Channel c = Channel.current();
        return c==null ? this : c.export(RemotableSVNAuthenticationProvider.class, this);
    }

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  public PBSSlave getNode() {
    return (PBSSlave)super.getNode();
  }
  
  public List<Queue> getQueues() throws IOException, InterruptedException {
    Channel channel = getChannel();
    if (channel == null)
      return Collections.emptyList();
    List<Queue> queues = channel.call(new GetPBSQueues());
    return queues;
  }

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            Pipe out = Pipe.createRemoteToLocal();
            final String workDir = _workDir==null ? null : _workDir.getRemote();


            OutputStream os = getChannel().call(new RemoteChannelLaunchCallable(cmd, out, err, workDir, envOverrides));


            return new Channel("remotely launched channel on "+channel,
                Computer.threadPoolForRemoting, out.getIn(), new BufferedOutputStream(os));
        }

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        final FastPipedOutputStream p1o = new FastPipedOutputStream(p1i);
        final FastPipedOutputStream p2o = new FastPipedOutputStream(p2i);


        Future<Channel> f1 = executors.submit(new Callable<Channel>() {
            public Channel call() throws Exception {
                return new Channel("This side of the channel", executors, p1i, p2o);
            }
        });
        Future<Channel> f2 = executors.submit(new Callable<Channel>() {
            public Channel call() throws Exception {
                return new Channel("The other side of the channel", executors, p2i, p1o);
            }
        });
        french = f1.get();
        british = f2.get();
    }

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        /**
         * Handles CLI connection request.
         */
        private void runCliConnect(DataInputStream in, PrintWriter out) throws IOException, InterruptedException {
            out.println("Welcome");
            Channel channel = new Channel("CLI channel from " + s.getInetAddress(),
                    Computer.threadPoolForRemoting, Mode.BINARY,
                    new BufferedInputStream(new SocketInputStream(this.s)),
                    new BufferedOutputStream(new SocketOutputStream(this.s)), null, true);
            channel.setProperty(CliEntryPoint.class.getName(),new CliManagerImpl());
            channel.join();
        }

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Examples of hudson.remoting.Channel

Implementor's Note

Related Classes of hudson.remoting.Channel