Android example source code file (Forwarder.java)

This example Android source code file (Forwarder.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, forwarder, forwardserver, inputstream, io, ioexception, logtag, net, network, outputstream, override, runnable, socket, socketpipe, string, thread, util, utilities

The Forwarder.java Android example source code

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * 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.android.dumprendertree.forwarder;

import android.util.Log;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

/**
 *
 * Worker class for {@link ForwardServer}. A Forwarder will be created once the ForwardServer
 * accepts an incoming connection, and it will then forward the incoming/outgoing streams to a
 * connection already proxied by adb networking (see also {@link AdbUtils}).
 *
 */
public class Forwarder {

    private ForwardServer server;
    private Socket from, to;

    private static final String LOGTAG = "Forwarder";

    public Forwarder (Socket from, Socket to, ForwardServer server) {
        this.server = server;
        this.from = from;
        this.to = to;
        server.register(this);
    }

    public void start() {
        Thread outgoing = new Thread(new SocketPipe(from, to));
        Thread incoming = new Thread(new SocketPipe(to, from));
        outgoing.setName(LOGTAG);
        incoming.setName(LOGTAG);
        outgoing.start();
        incoming.start();
    }

    public void stop() {
        shutdown(from);
        shutdown(to);
    }

    private void shutdown(Socket socket) {
        try {
            socket.shutdownInput();
        } catch (IOException e) {
            Log.v(LOGTAG, "Socket#shutdownInput", e);
        }
        try {
            socket.shutdownOutput();
        } catch (IOException e) {
            Log.v(LOGTAG, "Socket#shutdownOutput", e);
        }
        try {
            socket.close();
        } catch (IOException e) {
            Log.v(LOGTAG, "Socket#close", e);
        }
    }

    private class SocketPipe implements Runnable {

        private Socket in, out;

        public SocketPipe(Socket in, Socket out) {
            this.in = in;
            this.out = out;
        }

        public void run() {
            try {
                int length;
                InputStream is = in.getInputStream();
                OutputStream os = out.getOutputStream();
                byte[] buffer = new byte[4096];
                while ((length = is.read(buffer)) > 0) {
                    os.write(buffer, 0, length);
                }
            } catch (IOException ioe) {
            } finally {
                server.unregister(Forwarder.this);
            }
        }

        @Override
        public String toString() {
            return "SocketPipe{" + in + "=>" + out  + "}";
        }
    }
}