libjava/gnu/javax/rmi/PortableServer.java

   1 /* PortableServer.java --
   2    Copyright (C) 2002 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., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 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.javax.rmi;
  40
  41 import java.util.Hashtable;
  42 import java.rmi.Remote;
  43 import java.rmi.RemoteException;
  44 import java.rmi.NoSuchObjectException;
  45 import java.rmi.server.ExportException;
  46 import java.rmi.server.UnicastRemoteObject;
  47 import java.rmi.server.RemoteStub;
  48 import javax.rmi.CORBA.*;
  49 //import org.omg.CORBA.portable.ObjectImpl;
  50
  51 /**
  52  * The relationship of PortableRemoteObjectImpl with PortableServer
  53  * is like that of UnicastRemoteObject with UnicastServer
  54  */
  55 public class PortableServer
  56 {
  57   static private Hashtable tieCache = new Hashtable();
  58   static private Object NO_TIE = new Object();
  59
  60   public static final synchronized void exportObject(Remote obj)
  61     throws RemoteException
  62   {
  63     if(Util.getTie(obj) != null)
  64       return;
  65
  66     Tie tie = getTieFromRemote(obj);
  67     if (tie != null)
  68       Util.registerTarget(tie, obj);
  69     else
  70       UnicastRemoteObject.exportObject(obj);
  71   }
  72
  73   public static final void unexportObject(Remote obj)
  74   {
  75     if (Util.getTie(obj) != null)
  76       Util.unexportObject(obj);
  77     if (tieCache.get(obj) != null) //??
  78       tieCache.remove(obj);
  79   }
  80
  81   public static final Remote toStub(Remote obj)
  82     throws NoSuchObjectException
  83   {
  84     if (obj instanceof Stub || obj instanceof RemoteStub)
  85       return obj;
  86
  87     Tie tie = Util.getTie(obj);
  88     Remote stub;
  89     if (tie != null)
  90       stub = getStubFromTie(tie);
  91     else
  92       throw new NoSuchObjectException("Can't toStub an unexported object");
  93     return stub;
  94   }
  95
  96   static synchronized Tie getTieFromRemote(Remote obj)
  97   {
  98     Object tie = tieCache.get(obj);
  99     if (tie == null)
 100       {
 101         tie = getTieFromClass(obj.getClass());
 102         if(tie == null)
 103           tieCache.put(obj, NO_TIE);
 104         else
 105           tieCache.put(obj, tie);
 106       }
 107     else
 108       if(tie != NO_TIE)
 109         {
 110           try
 111             {
 112               tie = obj.getClass().newInstance();
 113             }
 114           catch(Exception _)
 115             {
 116               tie = null;
 117             }
 118         }
 119       else //NO_TIE
 120         tie = null;
 121
 122     return (Tie)tie;
 123   }
 124
 125   static synchronized Tie getTieFromClass(Class clz)
 126   {
 127     //FIX ME
 128     return null;
 129   }
 130
 131   public static Remote getStubFromTie(Tie tie)
 132   {
 133     //FIX ME
 134     return null;
 135   }
 136
 137   public static Remote getStubFromObjectImpl(ObjectImpl objimpl, Class toClass)
 138   {
 139     //FIX ME
 140     return null;
 141   }
 142 }