WebServiceInvoker


1   /*
2    * CoadunationLib: The coaduntion implementation library.
3    * Copyright (C) 2006  Rift IT Contracting
4    * 
5    * This library is free software; you can redistribute it and/or
6    * modify it under the terms of the GNU Lesser General Public
7    * License as published by the Free Software Foundation; either
8    * version 2.1 of the License, or (at your option) any later version.
9    * 
10   * This library is distributed in the hope that it will be useful,
11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   * Lesser General Public License for more details.
14   * 
15   * You should have received a copy of the GNU Lesser General Public
16   * License along with this library; if not, write to the Free Software
17   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
18   *
19   * WebServiceInvoker.java
20   *
21   * The web service invoker inherits from the RPCProvider and is responsible for
22   * making the final call on the web service. Doing this makes it responsible for
23   * setting the thread context loader appropriatly so that the RMI stubs can be
24   * loaded from the appropriat jars.
25   */
26  
27  // The path to the package
28  package com.rift.coad.lib.webservice;
29  
30  // java imports
31  import java.lang.reflect.Method  ;
32  
33  // axis imports
34  import org.apache.axis.MessageContext;
35  import org.apache.axis.providers.java.RPCProvider;
36  
37  /**
38   * The web service invoker inherits from the RPCProvider and is responsible for
39   * making the final call on the web service. Doing this makes it responsible for
40   * setting the thread context loader appropriatly so that the RMI stubs can be
41   * loaded from the appropriat jars.
42   *
43   * @author Brett Chaldecott
44   */
45  public class WebServiceInvoker extends RPCProvider {
46      
47      // the reference to the class loader
48      private ClassLoader   classLoader = null;
49      
50      /** 
51       * Creates a new instance of WebServiceInvoker 
52       */
53      public WebServiceInvoker(ClassLoader   classLoader) {
54          this.classLoader = classLoader;
55      }
56      
57      
58      /**
59       * This method encapsulates the method invocation.
60       *
61       * @return The object resulting from the call.
62       * @param msgContext The message context for this call.
63       * @param method The reference to the method to invoke.
64       * @param obj The target object to invoke the method on.
65       * @param argValues The method parameters.
66       * @exception Exception
67       */
68      protected Object   invokeMethod(MessageContext msgContext, Method   method,
69              Object   obj, Object  [] argValues) throws Exception   {
70          ClassLoader   originalClassLoader = Thread.currentThread().
71                  getContextClassLoader();
72          try {
73              Thread.currentThread().setContextClassLoader(this.classLoader);
74              return method.invoke(obj,argValues);
75          } finally {
76              Thread.currentThread().setContextClassLoader(originalClassLoader);
77          }
78      }
79      
80  }
81
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