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1   /*
2    * $Id: MuleContainerWrapper.java 19191 2010-08-25 21:05:23Z tcarlson $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
5    *
6    * The software in this package is published under the terms of the CPAL v1.0
7    * license, a copy of which has been included with this distribution in the
8    * LICENSE.txt file.
9    */
10  
11  package org.mule.module.reboot;
12  
13  import java.lang.reflect.Constructor;
14  import java.lang.reflect.Method;
15  
16  import org.tanukisoftware.wrapper.WrapperListener;
17  import org.tanukisoftware.wrapper.WrapperManager;
18  
19  public class MuleContainerWrapper implements WrapperListener
20  {
21  
22      protected static final String CLASSNAME_MULE_CONTAINER = "org.mule.module.launcher.MuleContainer";
23  
24      /**
25       * We can't reference MuleServer class literal here, as it will fail to resolve at runtime.
26       * Instead, make all calls anonymous through reflection, so we can safely pump up our new classloader
27       * and make it the default one for downstream applications.
28       */
29      private Object mule;
30  
31      /*---------------------------------------------------------------
32       * Constructors
33       *-------------------------------------------------------------*/
34      public MuleContainerWrapper()
35      {
36          super();
37      }
38  
39      /*---------------------------------------------------------------
40       * WrapperListener Methods
41       *-------------------------------------------------------------*/
42      /**
43       * The start method is called when the WrapperManager is signaled by the native
44       * wrapper code that it can start its application. This method call is expected
45       * to return, so a new thread should be launched if necessary.
46       * 
47       * @param args List of arguments used to initialize the application.
48       * @return Any error code if the application should exit on completion of the
49       *         start method. If there were no problems then this method should return
50       *         null.
51       */
52      public Integer start(String[] args)
53      {
54          try
55          {
56              ClassLoader muleSystemCl = new MuleContainerSystemClassLoader();
57  
58              Thread.currentThread().setContextClassLoader(muleSystemCl);
59  
60              Class<?> muleClass = Thread.currentThread().getContextClassLoader().loadClass(CLASSNAME_MULE_CONTAINER);
61              Constructor<?> c = muleClass.getConstructor(String[].class);
62              mule = c.newInstance(new Object[] {args});
63              Method startMethod = muleClass.getMethod("start", boolean.class);
64              startMethod.invoke(mule, true);
65              return null;
66          }
67          catch (Exception e)
68          {
69              e.printStackTrace();
70              return 1;
71          }
72      }
73  
74      /**
75       * Called when the application is shutting down. The Wrapper assumes that this
76       * method will return fairly quickly. If the shutdown code code could potentially
77       * take a long time, then WrapperManager.signalStopping() should be called to
78       * extend the timeout period. If for some reason, the stop method can not return,
79       * then it must call WrapperManager.stopped() to avoid warning messages from the
80       * Wrapper.
81       * 
82       * @param exitCode The suggested exit code that will be returned to the OS when
83       *            the JVM exits.
84       * @return The exit code to actually return to the OS. In most cases, this should
85       *         just be the value of exitCode, however the user code has the option of
86       *         changing the exit code if there are any problems during shutdown.
87       */
88      public int stop(int exitCode)
89      {
90          try
91          {
92              Method shutdownMethod = mule.getClass().getMethod("shutdown");
93              shutdownMethod.invoke(mule);
94          }
95          catch (Throwable t)
96          {
97              // ignore
98          }
99          
100         return exitCode;
101     }
102 
103     /**
104      * Called whenever the native wrapper code traps a system control signal against
105      * the Java process. It is up to the callback to take any actions necessary.
106      * Possible values are: WrapperManager.WRAPPER_CTRL_C_EVENT,
107      * WRAPPER_CTRL_CLOSE_EVENT, WRAPPER_CTRL_LOGOFF_EVENT, or
108      * WRAPPER_CTRL_SHUTDOWN_EVENT
109      * 
110      * @param event The system control signal.
111      */
112     public void controlEvent(int event)
113     {
114         if (WrapperManager.isControlledByNativeWrapper())
115         {
116             // The Wrapper will take care of this event
117         }
118         else
119         {
120             // We are not being controlled by the Wrapper, so
121             // handle the event ourselves.
122             if ((event == WrapperManager.WRAPPER_CTRL_C_EVENT)
123                 || (event == WrapperManager.WRAPPER_CTRL_CLOSE_EVENT)
124                 || (event == WrapperManager.WRAPPER_CTRL_SHUTDOWN_EVENT))
125             {
126                 WrapperManager.stop(0);
127             }
128         }
129     }
130 
131 }