Forwarder.java revision 6bf18bae60ae1ff0bf2407e8db115cbbab6f1b84 
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
40    public Forwarder (Socket from, Socket to, ForwardServer server) {
41        this.server = server;
42        this.from = from;
43        this.to = to;
44        server.register(this);
45    }
46
47    public void start() {
48        Thread outgoing = new Thread(new SocketPipe(from, to));
49        Thread incoming = new Thread(new SocketPipe(to, from));
50        outgoing.setName(LOGTAG);
51        incoming.setName(LOGTAG);
52        outgoing.start();
53        incoming.start();
54    }
55
56    public void stop() {
57        shutdown(from);
58        shutdown(to);
59    }
60
61    private void shutdown(Socket socket) {
62        try {
63            socket.shutdownInput();
64        } catch (IOException e) {
65            Log.v(LOGTAG, "Socket#shutdownInput", e);
66        }
67        try {
68            socket.shutdownOutput();
69        } catch (IOException e) {
70            Log.v(LOGTAG, "Socket#shutdownOutput", e);
71        }
72        try {
73            socket.close();
74        } catch (IOException e) {
75            Log.v(LOGTAG, "Socket#close", e);
76        }
77    }
78
79    private class SocketPipe implements Runnable {
80
81        private Socket in, out;
82
83        public SocketPipe(Socket in, Socket out) {
84            this.in = in;
85            this.out = out;
86        }
87
88        public void run() {
89            try {
90                int length;
91                InputStream is = in.getInputStream();
92                OutputStream os = out.getOutputStream();
93                byte[] buffer = new byte[4096];
94                while ((length = is.read(buffer)) > 0) {
95                    os.write(buffer, 0, length);
96                }
97            } catch (IOException ioe) {
98            } finally {
99                server.unregister(Forwarder.this);
100            }
101        }
102
103        @Override
104        public String toString() {
105            return "SocketPipe{" + in + "=>" + out  + "}";
106        }
107    }
108}
109