ServiceInvokerServlet


1   /**
2    * Copyright 2004-2005 jManage.org
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.jmanage.webui.servlets;
17  
18  import org.jmanage.core.remote.RemoteInvocation;
19  import org.jmanage.core.remote.InvocationResult;
20  import org.jmanage.core.remote.server.ServiceCallHandler;
21  
22  import javax.servlet.http.HttpServlet  ;
23  import javax.servlet.http.HttpServletRequest  ;
24  import javax.servlet.http.HttpServletResponse  ;
25  import javax.servlet.ServletException  ;
26  import javax.servlet.ServletInputStream  ;
27  import javax.servlet.ServletOutputStream  ;
28  import java.io.IOException  ;
29  import java.io.ObjectInputStream  ;
30  import java.io.ObjectOutputStream  ;
31  
32  /**
33   *
34   * date:  Feb 24, 2005
35   * @author  Rakesh Kalra
36   */
37  public class ServiceInvokerServlet extends HttpServlet   {
38  
39      private static String   RESPONSE_CONTENT_TYPE =
40         "application/x-java-serialized-object; class=org.jmanage.core.remote.InvocationResult";
41  
42      /**
43       * Handles the HTTP <code>GET</code> method.
44       */
45      protected void doGet(HttpServletRequest   request, HttpServletResponse   response)
46              throws ServletException  , IOException   {
47          processRequest(request, response);
48      }
49  
50      /**
51       * Handles the HTTP <code>POST</code> method.
52       */
53      protected void doPost(HttpServletRequest   request, HttpServletResponse   response)
54              throws ServletException  , IOException   {
55          processRequest(request, response);
56      }
57  
58      public String   getServletInfo() {
59          return "Servlet to remotely invoke service methods";
60      }
61  
62  
63      protected void processRequest(HttpServletRequest   request,
64                                    HttpServletResponse   response)
65              throws ServletException  , IOException   {
66  
67          response.setContentType(RESPONSE_CONTENT_TYPE);
68          try {
69              /* get the RemoteInvocation object */
70              ServletInputStream   sis = request.getInputStream();
71              ObjectInputStream   ois = new ObjectInputStream  (sis);
72              RemoteInvocation invocation = (RemoteInvocation) ois.readObject();
73              ois.close();
74              /* execute the method */
75              InvocationResult result = ServiceCallHandler.execute(invocation);
76              /* write the result */
77              ServletOutputStream   sos = response.getOutputStream();
78              ObjectOutputStream   oos = new ObjectOutputStream  (sos);
79              oos.writeObject(result);
80              oos.close();
81          } catch (Throwable   t) {
82              /* write the exception */
83              ServletOutputStream   sos = response.getOutputStream();
84              ObjectOutputStream   oos = new ObjectOutputStream  (sos);
85              oos.writeObject(new InvocationResult(t));
86              oos.close();
87          }
88      }
89  }
90
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