1 /***
2 * Redistribution and use of this software and associated documentation
3 * ("Software"), with or without modification, are permitted provided
4 * that the following conditions are met:
5 *
6 * 1. Redistributions of source code must retain copyright
7 * statements and notices. Redistributions must also contain a
8 * copy of this document.
9 *
10 * 2. Redistributions in binary form must reproduce the
11 * above copyright notice, this list of conditions and the
12 * following disclaimer in the documentation and/or other
13 * materials provided with the distribution.
14 *
15 * 3. The name "Exolab" must not be used to endorse or promote
16 * products derived from this Software without prior written
17 * permission of Exoffice Technologies. For written permission,
18 * please contact tma@netspace.net.au.
19 *
20 * 4. Products derived from this Software may not be called "Exolab"
21 * nor may "Exolab" appear in their names without prior written
22 * permission of Exoffice Technologies. Exolab is a registered
23 * trademark of Exoffice Technologies.
24 *
25 * 5. Due credit should be given to the Exolab Project
26 * (http://www.exolab.org/).
27 *
28 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
29 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
30 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
31 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
32 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
33 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
34 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
35 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
39 * OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Copyright 2001-2004 (C) Exoffice Technologies Inc. All Rights Reserved.
42 *
43 * $Id: AsyncExecutor.java,v 1.4 2004/02/03 21:52:06 tanderson Exp $
44 */
45 package org.exolab.jmscts.core;
46
47 import java.io.OutputStream;
48
49 import org.apache.log4j.Category;
50
51 import org.exolab.jmscts.core.service.ExecutionMonitorService;
52
53
54 /***
55 * This class enables java applications to be executed asynchronously,
56 * with the output being captured, or echoed to System.out and System.err
57 * Clients can register a listener to be notified when the application
58 * starts and stops.
59 *
60 * @version $Revision: 1.4 $ $Date: 2004/02/03 21:52:06 $
61 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
62 * @see Executor
63 * @see ExecutionListener
64 */
65 public class AsyncExecutor {
66
67 /***
68 * The command to execute
69 */
70 private String _command = null;
71
72 /***
73 * The command executor
74 */
75 private Executor _executor = null;
76
77 /***
78 * The identifier for this executor
79 */
80 private String _id = null;
81
82 /***
83 * The logger
84 */
85 private static final Category log =
86 Category.getInstance(AsyncExecutor.class.getName());
87
88
89 /***
90 * Constructor to execute a command, with output going to System.out and
91 * System.err
92 *
93 * @param application the class of the application to execute
94 * @param arguments any arguments to pass to the application
95 * @param port the RMI registry port
96 */
97 public AsyncExecutor(Class application, String arguments, int port) {
98 this(application, arguments, System.out, System.err, port);
99 }
100
101 /***
102 * Constructor to execute a command, with all output going to a stream
103 *
104 * @param application the class of the application to execute
105 * @param arguments any arguments to pass to the application
106 * @param out the stream to log output to
107 * @param port the RMI registry port
108 */
109 public AsyncExecutor(Class application, String arguments,
110 OutputStream out, int port) {
111 this(application, arguments, out, out, port);
112 }
113
114 /***
115 * Constructor to execute a command with standard output and error output
116 * going to two separate streams
117 *
118 * @param application the class of the application to execute
119 * @param arguments any arguments to pass to the application
120 * @param out the stream to direct standard output to
121 * @param err the stream to direct standard error to
122 * @param port the RMI registry port
123 */
124 public AsyncExecutor(Class application, String arguments, OutputStream out,
125 OutputStream err, int port) {
126 if (application == null) {
127 throw new IllegalArgumentException("Argument application is null");
128 }
129 if (out == null) {
130 throw new IllegalArgumentException("Argument out is null");
131 }
132 if (err == null) {
133 throw new IllegalArgumentException("Argument err is null");
134 }
135 _id = ExecutionMonitorService.instance().allocateId();
136
137 StringBuffer command = new StringBuffer();
138 command.append(System.getProperty("java.home"));
139 command.append("/bin/java ");
140 String policy = System.getProperty("java.security.policy");
141 if (policy != null) {
142 command.append(" -Djava.security.policy=");
143 command.append(policy);
144 command.append(" ");
145 }
146 command.append(" -classpath ");
147 command.append(System.getProperty("java.class.path"));
148 command.append(" ");
149 command.append(ApplicationRunner.class.getName());
150 command.append(" ");
151 command.append(_id);
152 command.append(" ");
153 command.append(port);
154 command.append(" ");
155 command.append(application.getName());
156 if (arguments != null) {
157 command.append(" ");
158 command.append(arguments);
159 }
160 _command = command.toString();
161 }
162
163 /***
164 * Add a listener to monitor for execution events
165 *
166 * @param listener the listener to add
167 */
168 public void addListener(ExecutionListener listener) {
169 ExecutionMonitorService.instance().addListener(_id, listener);
170 }
171
172 /***
173 * Remove a listener
174 *
175 * @param listener the listener to remove
176 */
177 public void removeListener(ExecutionListener listener) {
178 ExecutionMonitorService.instance().removeListener(_id, listener);
179 }
180
181 /***
182 * Execute the command in a separate thread. This method returns
183 * immediately
184 */
185 public synchronized void run() {
186 if (_executor == null) {
187 _executor = new Executor(_command);
188 }
189 Thread thread = new Thread() {
190 public void run() {
191 try {
192 int status = _executor.run();
193 ExecutionMonitorService.instance().stopped(_id, status);
194 } catch (Exception exception) {
195 ExecutionMonitorService.instance().failed(_id, exception);
196 }
197 }
198 };
199 log.debug("running command=" + _command);
200 thread.start();
201
202 }
203
204 /***
205 * Stop the process
206 */
207 public void stop() {
208 if (_executor != null) {
209 _executor.stop();
210 }
211 }
212
213 }
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