old-autovect-branch/libjava/classpath/org/omg/PortableServer/_ServantLocatorStub.java

   1 /* _ServantLocatorStub.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 org.omg.PortableServer;
  40
  41 import org.omg.CORBA.portable.ObjectImpl;
  42 import org.omg.PortableServer.ServantLocatorPackage.CookieHolder;
  43
  44 import java.io.Serializable;
  45
  46 /**
  47  * <p>The ServantLocator stub is an optional base for the
  48  * servant locators. This stub cannot accept remote invocations, as
  49  * methods in {@link ServantLocatorOperations} take POA as one of parameters.
  50  * Both JDK 1.5 API and OMG specifies that POA is a local object that must not
  51  * be transferred to the remote invocation target.
  52  * </p><p>
  53  * You do not need to derive your servant locator from this stub,
  54  * it is enough to implement the {@link ServantLocator} interface.
  55  * But you may choose to do this if you need its functional
  56  * {@link #_ids()} method or want to keep default behavior during per-
  57  * or post- invokcations.
  58  * </p>
  59  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
  60  */
  61 public class _ServantLocatorStub
  62   extends ObjectImpl
  63   implements ServantLocator, Serializable
  64 {
  65   /**
  66    * Use serialVersionUID (v1.4) for interoperability.
  67    */
  68   private static final long serialVersionUID = -2374963516905770111L;
  69
  70   /**
  71    * This the purpose of this field is undocumented up till 1.5 java API
  72    * inclusive.
  73    */
  74   public static final Class _opsClass = ServantLocatorOperations.class;
  75
  76   /**
  77    * The package private string, used as a parameter for
  78    * the throws NullPointerExceptions in both servant locator and activator
  79    * stubs.
  80    */
  81   static final String OVERRIDE = "Override this method to get functionality.";
  82
  83   /**
  84    * Return the array of repository ids for this object, stating that it is
  85    * both Servant locator and Servant manager.
  86    *
  87    * @return { "IDL:omg.org/PortableServer/ServantLocator:1.0",
  88    *           "IDL:omg.org/PortableServer/ServantManager:1.0" }, always.
  89    */
  90   public String[] _ids()
  91   {
  92     return new String[]
  93            {
  94              "IDL:omg.org/PortableServer/ServantLocator:1.0",
  95              "IDL:omg.org/PortableServer/ServantManager:1.0"
  96            };
  97   }
  98
  99   /**
 100    * It is your responsibility to take the preinvoke actions, if any,
 101    * and also supply an appropriate servant for the current invocation.
 102    *
 103    * The default method instructs POA that the servant cannot be
 104    * provided by locator. The OBJ_ADAPTER exception will be
 105    * thrown by POA, unless it uses the available default servant for all
 106    * invocations.
 107    *
 108    * @specnote in GNU Classpath, returning null means that the
 109    * locator does not supply the servant.
 110    *
 111    * @see ServantLocatorOperations#preinvoke
 112    */
 113   public Servant preinvoke(byte[] Object_id, POA poa, String method,
 114                            CookieHolder cookie
 115                           )
 116                     throws ForwardRequest
 117   {
 118     return null;
 119   }
 120
 121   /**
 122    * It is your responsibility to take the postinvoke actions, if any,
 123    * by overriding this method. The default method does nothing.
 124    *
 125    * @see ServantLocatorOperations#postinvoke
 126    */
 127   public void postinvoke(byte[] Object_id, POA poa, String method,
 128                          Object cookie, Servant servant
 129                         )
 130   {
 131   }
 132 }