1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * This library is free software; you can redistribute it and/or modify it under
5    * the terms of the GNU Lesser General Public License as published by the Free
6    * Software Foundation; either version 2.1 of the License, or (at your option)
7    * any later version.
8    *
9    * This library is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11   * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
12   * details.
13   */
14  
15  package com.liferay.portal.kernel.deploy.hot;
16  
17  import com.liferay.portal.kernel.bean.ContextClassLoaderBeanHandler;
18  import com.liferay.portal.kernel.messaging.DestinationNames;
19  import com.liferay.portal.kernel.messaging.MessageBusUtil;
20  import com.liferay.portal.kernel.messaging.MessageListener;
21  import com.liferay.portal.kernel.servlet.ServletContextUtil;
22  import com.liferay.portal.kernel.util.WebKeys;
23  
24  import java.lang.reflect.Field;
25  import java.lang.reflect.Proxy;
26  
27  import java.util.ArrayList;
28  import java.util.List;
29  import java.util.Set;
30  
31  import javax.servlet.ServletContext;
32  
33  /**
34   * <a href="BaseHotDeployListener.java.html"><b><i>View Source</i></b></a>
35   *
36   * @author Brian Wing Shun Chan
37   */
38  public abstract class BaseHotDeployListener implements HotDeployListener {
39  
40      public void throwHotDeployException(
41              HotDeployEvent event, String msg, Throwable t)
42          throws HotDeployException {
43  
44          ServletContext servletContext = event.getServletContext();
45  
46          String servletContextName = servletContext.getServletContextName();
47  
48          throw new HotDeployException(msg + servletContextName, t);
49      }
50  
51      protected Object newInstance(
52              ClassLoader portletClassLoader, Class<?> interfaceClass,
53              String implClassName)
54          throws Exception {
55  
56          return newInstance(
57              portletClassLoader, new Class[] {interfaceClass}, implClassName);
58      }
59  
60      protected Object newInstance(
61              ClassLoader portletClassLoader, Class<?>[] interfaceClasses,
62              String implClassName)
63          throws Exception {
64  
65          Object instance = portletClassLoader.loadClass(
66              implClassName).newInstance();
67  
68          return Proxy.newProxyInstance(
69              portletClassLoader, interfaceClasses,
70              new ContextClassLoaderBeanHandler(instance, portletClassLoader));
71      }
72  
73      protected void registerClpMessageListeners(
74              ServletContext servletContext, ClassLoader portletClassLoader)
75          throws Exception {
76  
77          List<MessageListener> clpMessageListeners =
78              (List<MessageListener>)servletContext.getAttribute(
79                  WebKeys.CLP_MESSAGE_LISTENERS);
80  
81          if (clpMessageListeners != null) {
82              return;
83          }
84  
85          clpMessageListeners = new ArrayList<MessageListener>();
86  
87          Set<String> classNames = ServletContextUtil.getClassNames(
88              servletContext);
89  
90          for (String className : classNames) {
91              if (className.endsWith(".ClpMessageListener")) {
92                  Class<?> clpMessageListenerClass = portletClassLoader.loadClass(
93                      className);
94  
95                  MessageListener clpMessageListener =
96                      (MessageListener)clpMessageListenerClass.newInstance();
97  
98                  Field servletContextNameField =
99                      clpMessageListenerClass.getField(
100                         "SERVLET_CONTEXT_NAME");
101 
102                 String clpServletContextName = servletContextNameField.get(
103                     clpMessageListener).toString();
104 
105                 if (clpServletContextName.equals(
106                         servletContext.getServletContextName())) {
107 
108                     continue;
109                 }
110 
111                 clpMessageListeners.add(clpMessageListener);
112 
113                 MessageBusUtil.registerMessageListener(
114                     DestinationNames.HOT_DEPLOY, clpMessageListener);
115             }
116         }
117 
118         servletContext.setAttribute(
119             WebKeys.CLP_MESSAGE_LISTENERS, clpMessageListeners);
120     }
121 
122     protected void unregisterClpMessageListeners(ServletContext servletContext)
123         throws Exception {
124 
125         List<MessageListener> clpMessageListeners =
126             (List<MessageListener>)servletContext.getAttribute(
127                 WebKeys.CLP_MESSAGE_LISTENERS);
128 
129         if (clpMessageListeners != null) {
130             servletContext.removeAttribute(WebKeys.CLP_MESSAGE_LISTENERS);
131 
132             for (MessageListener clpMessageListener : clpMessageListeners) {
133                 MessageBusUtil.unregisterMessageListener(
134                     DestinationNames.HOT_DEPLOY, clpMessageListener);
135             }
136         }
137     }
138 
139 }