001 /* ServantLocatorPOA.java --
002 Copyright (C) 2005, 2006 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package org.omg.PortableServer;
040
041 import gnu.CORBA.Poa.gnuServantObject;
042
043 import org.omg.CORBA.NO_IMPLEMENT;
044 import org.omg.CORBA.ORB;
045 import org.omg.CORBA.SystemException;
046 import org.omg.CORBA.portable.InputStream;
047 import org.omg.CORBA.portable.InvokeHandler;
048 import org.omg.CORBA.portable.OutputStream;
049 import org.omg.CORBA.portable.ResponseHandler;
050 import org.omg.PortableServer.ServantLocatorPackage.CookieHolder;
051
052 /**
053 * <p>The ServantLocator stub is an optional base for the
054 * servant locators. It cannot serve remote invocations, as
055 * methods in {@link ServantLocatorOperations} take POA as one of parameters.
056 * Both JDK 1.5 API and OMG specifies that POA is a local object that must not
057 * be transferred to the remote invocation target.
058 * </p><p>
059 * You do not need to derive your servant locator from this stub,
060 * it is enough to implement the {@link ServantLocator} interface.
061 * But you may choose to do this if you need its functional
062 * {@link org.omg.PortableServer.ServantActivatorPOA.delegator#_ids()}
063 * method or want to keep default behaviour during pre- or post- invokcations.
064 * </p>
065 * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
066 */
067 public abstract class ServantLocatorPOA
068 extends Servant
069 implements ServantLocatorOperations, InvokeHandler
070 {
071 /**
072 * Used to access the outer class in the nested classes.
073 */
074 final ServantLocatorPOA THIS = this;
075
076 /**
077 * Our implementation will not call this method. After setting your
078 * manager to POA, it will call incarnate and etherialize directly.
079 */
080 public OutputStream _invoke(String method, InputStream input,
081 ResponseHandler handler
082 )
083 throws SystemException
084 {
085 throw new NO_IMPLEMENT();
086 }
087
088 /**
089 * Returns an array of interfaces, supported by the servant locator.
090 */
091 public String[] _all_interfaces(POA poa, byte[] Object_Id)
092 {
093 return new _ServantLocatorStub()._ids();
094 }
095
096 /**
097 * Return the complete instance of the servant activator, based on
098 * the current class (ServantActivatorPOA or derived).
099 */
100 public ServantLocator _this()
101 {
102 return new delegator(this);
103 }
104
105 /**
106 * Return the complete instance of the servant activator, based on
107 * the current class (ServantActivatorPOA or derived).
108 */
109 public ServantLocator _this(ORB orb)
110 {
111 return new delegator(this);
112 }
113
114 /**
115 * This class is used to support _this.
116 */
117 class delegator
118 extends gnuServantObject
119 implements ServantLocator
120 {
121 delegator(Servant s)
122 {
123 super(s, new byte[ 0 ], null, null);
124 }
125
126 public Servant preinvoke(byte[] Object_Id, POA poa, String method,
127 CookieHolder cookie_holder
128 )
129 throws org.omg.PortableServer.ForwardRequest
130 {
131 return THIS.preinvoke(Object_Id, poa, method, cookie_holder);
132 }
133
134 public void postinvoke(byte[] Object_Id, POA poa, String method,
135 java.lang.Object cookie, Servant servant
136 )
137 {
138 THIS.postinvoke(Object_Id, poa, method, cookie, servant);
139 }
140
141 public String[] _ids()
142 {
143 return THIS._all_interfaces(null, null);
144 }
145 }
146 }