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 }