MetaStub


1   /*
2    * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3    *
4    * This file is part of Resin(R) Open Source
5    *
6    * Each copy or derived work must preserve the copyright notice and this
7    * notice unmodified.
8    *
9    * Resin Open Source is free software; you can redistribute it and/or modify
10   * it under the terms of the GNU General Public License as published by
11   * the Free Software Foundation; either version 2 of the License, or
12   * (at your option) any later version.
13   *
14   * Resin Open Source is distributed in the hope that it will be useful,
15   * but WITHOUT ANY WARRANTY; without even the implied warranty of
16   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17   * of NON-INFRINGEMENT.  See the GNU General Public License for more
18   * details.
19   *
20   * You should have received a copy of the GNU General Public License
21   * along with Resin Open Source; if not, write to the
22   *   Free SoftwareFoundation, Inc.
23   *   59 Temple Place, Suite 330
24   *   Boston, MA 02111-1307  USA
25   *
26   * @author Scott Ferguson
27   */
28  
29  package com.caucho.ejb.hessian;
30  
31  import com.caucho.hessian.io.HessianInput;
32  import com.caucho.util.CharBuffer;
33  import com.caucho.vfs.Path;
34  import com.caucho.vfs.ReadStream;
35  import com.caucho.vfs.ReadWritePair;
36  import com.caucho.vfs.WriteStream;
37  
38  import java.io.IOException  ;
39  
40  /**
41   * Utility class to call methods easily.
42   */
43  public class MetaStub {
44    /**
45     * Calls an arbitrary method at the given url.
46     *
47     * @param url a path to the remote url
48     * @param method the method to call
49     * @param arg an argument
50     */
51    public static Object   call(Path urlPath, String   method, Object   arg)
52      throws Throwable  
53    {
54      return call(urlPath, method, new Object  [] { arg });
55    }
56    
57    /**
58     * Calls an arbitrary method at the given url.
59     *
60     * @param url a path to the remote url
61     * @param method the method to call
62     * @param args any arguments to call
63     */
64    public static Object   call(Path urlPath, String   method, Object   []args)
65      throws Throwable  
66    {
67      ReadWritePair pair = urlPath.openReadWrite();
68  
69      ReadStream is = pair.getReadStream();
70      WriteStream os = pair.getWriteStream();
71      
72      HessianInput in = new HessianInput(is);
73      HessianWriter out = new HessianWriter(os);
74  
75      try {
76        out.call(method, args);
77  
78        String   status = (String  ) is.getAttribute("status");
79  
80        if (! "200".equals(status)) {
81          CharBuffer msg = new CharBuffer();
82  
83          int ch;
84          while ((ch = is.readChar()) >= 0)
85            msg.append((char) ch);
86  
87          throw new IOException  ("bad status: " + status + "\n" + msg);
88        }
89  
90        return in.readReply(null);
91      } finally {
92        os.close();
93        is.close();
94      }
95    }
96  }
97
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