1 /*
2 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * A Launcher to launch a java process with its standard input, output,
26 * and error streams connected to a socket.
27 */
28 import java.io.IOException;
29 import java.net.InetAddress;
30 import java.net.InetSocketAddress;
31 import java.nio.channels.DatagramChannel;
32 import java.nio.channels.ServerSocketChannel;
33 import java.nio.channels.SocketChannel;
34
35 public class Launcher {
36
37 static {
38 System.loadLibrary("Launcher");
39 }
40
41 private static native void launch0(String cmdarray[], int fd) throws IOException;
42
43 private static void launch(String className, String options[], String args[], int fd) throws IOException {
44 // java [-options] class [args...]
45 int optsLen = (options == null) ? 0 : options.length;
46 int argsLen = (args == null) ? 0 : args.length;
47 int len = 1 + optsLen + 1 + argsLen;
48 String cmdarray[] = new String[len];
49 int pos = 0;
50 cmdarray[pos++] = Util.javaCommand();
51 if (options != null) {
52 for (String opt: options) {
53 cmdarray[pos++] = opt;
54 }
55 }
56 cmdarray[pos++] = className;
57 if (args != null) {
58 for (String arg: args) {
59 cmdarray[pos++] = arg;
60 }
61 }
62 launch0(cmdarray, fd);
63 }
64
65 /*
66 * Launch 'java' with specified class with the specified arguments (may be null).
67 * The launched process will inherit a connected TCP socket. The remote endpoint
68 * will be the SocketChannel returned by this method.
69 */
70 public static SocketChannel launchWithSocketChannel(String className, String options[], String args[]) throws IOException {
71 ServerSocketChannel ssc = ServerSocketChannel.open();
72 ssc.socket().bind(new InetSocketAddress(0));
73 InetSocketAddress isa = new InetSocketAddress(InetAddress.getLocalHost(),
74 ssc.socket().getLocalPort());
75 SocketChannel sc1 = SocketChannel.open(isa);
76 SocketChannel sc2 = ssc.accept();
77 launch(className, options, args, Util.getFD(sc2));
78 sc2.close();
79 ssc.close();
80 return sc1;
81 }
82
83 public static SocketChannel launchWithSocketChannel(String className, String args[]) throws IOException {
84 return launchWithSocketChannel(className, null, args);
85 }
86
87 public static SocketChannel launchWithSocketChannel(String className) throws IOException {
88 return launchWithSocketChannel(className, null);
89 }
90
91 /*
92 * Launch 'java' with specified class with the specified arguments (may be null).
93 * The launched process will inherited a TCP listener socket.
94 * Once launched this method tries to connect to service. If a connection
95 * can be established a SocketChannel, connected to the service, is returned.
96 */
97 public static SocketChannel launchWithServerSocketChannel(String className, String options[], String args[])
98 throws IOException
99 {
100 ServerSocketChannel ssc = ServerSocketChannel.open();
101 ssc.socket().bind(new InetSocketAddress(0));
102 int port = ssc.socket().getLocalPort();
103 launch(className, options, args, Util.getFD(ssc));
104 ssc.close();
105 InetSocketAddress isa = new InetSocketAddress(InetAddress.getLocalHost(), port);
106 return SocketChannel.open(isa);
107 }
108
109 public static SocketChannel launchWithServerSocketChannel(String className, String args[]) throws IOException {
110 return launchWithServerSocketChannel(className, null, args);
111 }
112
113 public static SocketChannel launchWithServerSocketChannel(String className) throws IOException {
114 return launchWithServerSocketChannel(className, null);
115 }
116
117 /*
118 * Launch 'java' with specified class with the specified arguments (may be null).
119 * The launch process will inherited a bound UDP socket.
120 * Once launched this method creates a DatagramChannel and "connects
121 * it to the service. The created DatagramChannel is then returned.
122 * As it is connected any packets sent from the socket will be
123 * sent to the service.
124 */
125 public static DatagramChannel launchWithDatagramChannel(String className, String options[], String args[])
126 throws IOException
127 {
128 DatagramChannel dc = DatagramChannel.open();
129 dc.socket().bind(new InetSocketAddress(0));
130
131 int port = dc.socket().getLocalPort();
132 launch(className, options, args, Util.getFD(dc));
133 dc.close();
134
135 dc = DatagramChannel.open();
136 InetAddress address = InetAddress.getLocalHost();
137 if (address.isLoopbackAddress()) {
138 address = InetAddress.getLoopbackAddress();
139 }
140 InetSocketAddress isa = new InetSocketAddress(address, port);
141
142 dc.connect(isa);
143 return dc;
144 }
145
146 public static DatagramChannel launchWithDatagramChannel(String className, String args[]) throws IOException {
147 return launchWithDatagramChannel(className, null, args);
148 }
149
150 public static DatagramChannel launchWithDatagramChannel(String className) throws IOException {
151 return launchWithDatagramChannel(className, null);
152 }
153 }