1 /* ServiceRequestConverter.java --
2    Copyright (C) 2005 Free Software Foundation, Inc.
3 
4 This file is part of GNU Classpath.
5 
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10 
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 General Public License for more details.
15 
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING.  If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
20 
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library.  Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25 
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module.  An independent module is a module which is not derived from
33 or based on this library.  If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so.  If you do not wish to do so, delete this
36 exception statement from your version. */
37 
38 
39 package gnu.CORBA;
40 
41 import gnu.CORBA.CDR.BufferedCdrOutput;
42 
43 import org.omg.CORBA.ARG_IN;
44 import org.omg.CORBA.ARG_INOUT;
45 import org.omg.CORBA.ARG_OUT;
46 import org.omg.CORBA.Any;
47 import org.omg.CORBA.Bounds;
48 import org.omg.CORBA.ServerRequest;
49 import org.omg.CORBA.portable.InputStream;
50 import org.omg.CORBA.portable.InvokeHandler;
51 import org.omg.CORBA.portable.OutputStream;
52 import org.omg.CORBA.portable.ResponseHandler;
53 import org.omg.CORBA.portable.Streamable;
54 
55 /**
56  * This class supports invocation using ServerRequest. When possible,
57  * it is better to use  the {@link ObjectImpl#_invoke} rather than
58  * working via ServerRequest. However since 1.4 the ServerRequest is
59  * involved into POA machinery making this type of call is sometimes
60  * inavoidable.
61  *
62  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
63  */
64 public class ServiceRequestAdapter
65   implements ResponseHandler
66 {
67   /**
68    * A buffer for writing the response.
69    */
70   BufferedCdrOutput reply = new BufferedCdrOutput();
71 
72   /**
73    * If set to true, an exception has been thrown during the invocation.
74    */
75   boolean isException;
76 
createExceptionReply()77   public OutputStream createExceptionReply()
78   {
79     isException = true;
80     return reply;
81   }
82 
createReply()83   public OutputStream createReply()
84   {
85     isException = false;
86     return reply;
87   }
88 
89   /**
90    * Make an invocation.
91    *
92    * @param request a server request, containg the invocation information.
93    * @param target the invocation target
94    * @param result the result holder with the set suitable streamable.
95    * Using this parameter only increase the performance. It can be
96    * null if the return type is void or unknown.
97    */
invoke(ServerRequest request, InvokeHandler target, Streamable result )98   public static void invoke(ServerRequest request, InvokeHandler target,
99                             Streamable result
100                            )
101   {
102     try
103       {
104         int IN = ARG_IN.value;
105         int OUT = ARG_OUT.value;
106 
107         // Write all arguments to the buffer output stream.
108         BufferedCdrOutput buffer = new BufferedCdrOutput();
109         gnuNVList args = new gnuNVList();
110         request.arguments(args);
111 
112         for (int i = 0; i < args.count(); i++)
113           {
114             if ((args.item(i).flags() & IN) != 0)
115               {
116                 args.item(i).value().write_value(buffer);
117               }
118           }
119 
120         ServiceRequestAdapter h = new ServiceRequestAdapter();
121 
122         target._invoke(request.operation(), buffer.create_input_stream(), h);
123 
124         InputStream in = h.reply.create_input_stream();
125 
126         if (h.isException)
127           {
128             // Write the exception information
129             gnuAny exc = new gnuAny();
130             GeneralHolder uku = new GeneralHolder(h.reply);
131             exc.insert_Streamable(uku);
132             request.set_exception(exc);
133           }
134         else
135           {
136             if (result != null)
137               {
138                 // Use the holder for the return value, if provided.
139                 result._read(in);
140 
141                 gnuAny r = new gnuAny();
142                 r.insert_Streamable(result);
143                 request.set_result(r);
144               }
145             else
146               {
147                 // Use the universal holder otherwise.
148                 gnuAny r = new gnuAny();
149                 r.insert_Streamable(new StreamHolder(in));
150               }
151 
152             // Unpack the arguments
153             for (int i = 0; i < args.count(); i++)
154               {
155                 if ((args.item(i).flags() & OUT) != 0)
156                   {
157                     Any a = args.item(i).value();
158                     a.read_value(in, a.type());
159                   }
160               }
161           }
162       }
163     catch (Bounds ex)
164       {
165         throw new InternalError();
166       }
167   }
168 }