Forwarder.java revision f6d1b3f125b06fcc4847be3cfb35e8ce21905676 
1/*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.dumprendertree.forwarder;
18
19import android.util.Log;
20
21import java.io.IOException;
22import java.io.InputStream;
23import java.io.OutputStream;
24import java.net.Socket;
25
26/**
27 *
28 * Worker class for {@link ForwardServer}. A Forwarder will be created once the ForwardServer
29 * accepts an incoming connection, and it will then forward the incoming/outgoing streams to a
30 * connection already proxied by adb networking (see also {@link AdbUtils}).
31 *
32 */
33public class Forwarder {
34
35    private ForwardServer server;
36    private Socket from, to;
37
38    private static final String LOGTAG = "Forwarder";
39    private static final int BUFFER_SIZE = 16384;
40
41    public Forwarder (Socket from, Socket to, ForwardServer server) {
42        this.server = server;
43        this.from = from;
44        this.to = to;
45        server.register(this);
46    }
47
48    public void start() {
49        Thread outgoing = new Thread(new SocketPipe(from, to));
50        Thread incoming = new Thread(new SocketPipe(to, from));
51        outgoing.setName(LOGTAG);
52        incoming.setName(LOGTAG);
53        outgoing.start();
54        incoming.start();
55    }
56
57    public void stop() {
58        shutdown(from);
59        shutdown(to);
60    }
61
62    private void shutdown(Socket socket) {
63        try {
64            socket.shutdownInput();
65        } catch (IOException e) {
66            Log.v(LOGTAG, "Socket#shutdownInput", e);
67        }
68        try {
69            socket.shutdownOutput();
70        } catch (IOException e) {
71            Log.v(LOGTAG, "Socket#shutdownOutput", e);
72        }
73        try {
74            socket.close();
75        } catch (IOException e) {
76            Log.v(LOGTAG, "Socket#close", e);
77        }
78    }
79
80    private class SocketPipe implements Runnable {
81
82        private Socket in, out;
83
84        public SocketPipe(Socket in, Socket out) {
85            this.in = in;
86            this.out = out;
87        }
88
89        public void run() {
90            try {
91                int length;
92                InputStream is = in.getInputStream();
93                OutputStream os = out.getOutputStream();
94                byte[] buffer = new byte[BUFFER_SIZE];
95                while ((length = is.read(buffer)) > 0) {
96                    os.write(buffer, 0, length);
97                }
98            } catch (IOException ioe) {
99            } finally {
100                server.unregister(Forwarder.this);
101            }
102        }
103
104        @Override
105        public String toString() {
106            return "SocketPipe{" + in + "=>" + out  + "}";
107        }
108    }
109}
110