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: MessengerService.java,v 1.2 2004/02/02 03:49:20 tanderson Exp $
44 */
45 package org.exolab.jmscts.core.service;
46
47 import org.apache.log4j.Category;
48
49 import org.exolab.core.service.Service;
50 import org.exolab.core.service.ServiceException;
51 import org.exolab.core.service.ServiceState;
52
53 import org.exolab.jmscts.core.AsyncExecutor;
54 import org.exolab.jmscts.core.ExecutionListener;
55
56
57 /***
58 * This class enables messaging operations to be performed in a separate
59 * JVM
60 * <p>
61 * This service is dependent on the
62 * {@link org.exolab.core.util.RmiRegistryService} and
63 * {@link ExecutionMonitorService}. These must be initialised prior to
64 * starting this service
65 *
66 * @version $Revision: 1.2 $ $Date: 2004/02/02 03:49:20 $
67 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
68 */
69 public class MessengerService extends Service implements ExecutionListener {
70
71 /***
72 * The service name
73 */
74 public static final String NAME = "MessengerService";
75
76 /***
77 * The singleton instance
78 */
79 private static MessengerService _instance = null;
80
81 /***
82 * The RMI registry port
83 */
84 private int _port = 0;
85
86 /***
87 * The name of the server bound in the RMI registry
88 */
89 private String _name = null;
90
91 /***
92 * The executor
93 */
94 private AsyncExecutor _executor = null;
95
96 /***
97 * The logger
98 */
99 private static final Category log =
100 Category.getInstance(MessengerService.class);
101
102
103 /***
104 * Construct a new <code>MessengerService</code>
105 *
106 * @param port the RMI registry port
107 */
108 public MessengerService(int port) {
109 super(NAME);
110 _port = port;
111 }
112
113 /***
114 * Start the service
115 *
116 * @throws ServiceException if the service can't be started
117 */
118 public synchronized void start() throws ServiceException {
119 if (!getState().isRunning()) {
120 try {
121 String args = "-port " + _port;
122 _executor = new AsyncExecutor(MessengerServer.class, args,
123 _port);
124 _executor.addListener(this);
125 _executor.run();
126 } catch (Exception exception) {
127 throw new ServiceException(exception.getMessage());
128 }
129 }
130 super.start();
131 }
132
133 /***
134 * Stop the service
135 *
136 * @throws ServiceException if the service can't be stopped
137 */
138 public synchronized void stop() throws ServiceException {
139 super.stop();
140 try {
141 _executor.stop();
142 } catch (Exception exception) {
143 throw new ServiceException(exception.getMessage());
144 }
145 }
146
147 /***
148 * Event handler invoked if the application cannot be started
149 *
150 * @param throwable the exception thrown by the application
151 */
152 public void failed(Throwable throwable) {
153 log.error("MessengerServer failed with error", throwable);
154 setState(ServiceState.STOPPED);
155 _executor = null;
156 }
157
158 /***
159 * Event handler invoked when the application starts
160 */
161 public void started() {
162 log.debug("MessengerServer started");
163 }
164
165 /***
166 * Event handler invoked when the application stops
167 *
168 * @param status the exit status of the application
169 */
170 public void stopped(int status) {
171 log.debug("MessengerServer stopped");
172 setState(ServiceState.STOPPED);
173 _executor = null;
174 }
175
176 /***
177 * Event handler invoked when the application throws an exception just
178 * prior to termination
179 *
180 * @param throwable the exception thrown by the application
181 */
182 public void error(Throwable throwable) {
183 log.error("MessengerServer failed with error", throwable);
184 }
185
186 }
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