EasyBeans


1   /**
2    * EasyBeans
3    * Copyright (C) 2006 Bull S.A.S.
4    * Contact: easybeans@objectweb.org
5    *
6    * This library is free software; you can redistribute it and/or
7    * modify it under the terms of the GNU Lesser General Public
8    * License as published by the Free Software Foundation; either
9    * version 2.1 of the License, or any later version.
10   *
11   * This library is distributed in the hope that it will be useful,
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   * Lesser General Public License for more details.
15   *
16   * You should have received a copy of the GNU Lesser General Public
17   * License along with this library; if not, write to the Free Software
18   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
19   * USA
20   *
21   * --------------------------------------------------------------------------
22   * $Id:$
23   * --------------------------------------------------------------------------
24   */
25  
26  package org.objectweb.easybeans.server;
27  
28  import java.net.URL  ;
29  
30  import org.objectweb.easybeans.log.JLog;
31  import org.objectweb.easybeans.log.JLogFactory;
32  
33  /**
34   * Starts an embedded server in standalone mode.
35   * @author Florent Benoit
36   */
37  public final class EasyBeans {
38  
39      /**
40       * Default XML file.
41       */
42      public static final String   DEFAULT_XML_FILE = "org/objectweb/easybeans/server/easybeans-default.xml";
43  
44      /**
45       * User XML file.
46       */
47      public static final String   USER_XML_FILE = "easybeans.xml";
48  
49      /**
50       * Logger.
51       */
52      private static JLog logger = JLogFactory.getLog(EasyBeans.class);
53  
54      /**
55       * Utility class. No public constructor.
56       */
57      private EasyBeans() {
58  
59      }
60  
61      /**
62       * Main method called by default.
63       * @param args the arguments for the main method
64       * @throws Exception if failures
65       */
66      public static void main(final String  [] args) throws Exception   {
67  
68          Embedded embedded = null;
69  
70          // user configuration ?
71          URL   xmlConfigurationURL = Thread.currentThread().getContextClassLoader().getResource(USER_XML_FILE);
72  
73          if (xmlConfigurationURL == null) {
74              logger.warn("No user-defined configuration file named {0} found in classpath, use default settings", USER_XML_FILE);
75              xmlConfigurationURL = Thread.currentThread().getContextClassLoader().getResource(DEFAULT_XML_FILE);
76          }
77          try {
78              embedded = EmbeddedConfigurator.create(xmlConfigurationURL);
79          } catch (EmbeddedException e) {
80              throw new Exception  ("Cannot create the embedded server", e);
81          }
82  
83          // Add hook for shutdown
84          Runtime.getRuntime().addShutdownHook(new ShutdownHook(embedded));
85  
86          // Start EasyBeans
87          embedded.start();
88  
89      }
90  
91      /**
92       * Hook that is called when process is going to shutdown.
93       * @author Florent Benoit
94       */
95      static class ShutdownHook extends Thread   {
96  
97          /**
98           * Reference to the embedded object.
99           */
100         private Embedded embedded = null;
101 
102         /**
103          * Build a new shutdown hook with the given embedded instance.
104          * @param embedded the instance to stop
105          */
106         public ShutdownHook(final Embedded embedded) {
107             this.embedded = embedded;
108         }
109 
110         /**
111          * Stop the embedded server.
112          */
113         @Override  
114         public void run() {
115             // stop embedded
116             try {
117                 embedded.stop();
118             } catch (EmbeddedException e) {
119                 System.err.println("Error while stopping embedded server");
120                 e.printStackTrace(System.err);
121             }
122         }
123     }
124 }
125
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