old-autovect-branch/libjava/classpath/gnu/CORBA/Poa/gnuPoaCurrent.java

   1 /* gnuPoaCurrent.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.Poa;
  40
  41 import org.omg.CORBA.CurrentHelper;
  42 import org.omg.CORBA.portable.ObjectImpl;
  43 import org.omg.PortableServer.Current;
  44 import org.omg.PortableServer.CurrentOperations;
  45 import org.omg.PortableServer.CurrentPackage.NoContext;
  46 import org.omg.PortableServer.POA;
  47
  48 import java.util.Iterator;
  49 import java.util.Map;
  50 import java.util.TreeMap;
  51
  52 /**
  53  * Supports the "Poa current" concept, providing the id and poa of
  54  * the object currently being served. There is only one instance
  55  * of this class per ORB. It maintains a thread to information map.
  56  *
  57  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
  58  */
  59 public class gnuPoaCurrent
  60   extends ObjectImpl
  61   implements Current
  62 {
  63   /**
  64    * The table, mapping threads to records.
  65    */
  66   private TreeMap threads = new TreeMap();
  67
  68   /**
  69    * Get the array of POA current repository ids.
  70    *
  71    * @return a single member array, containing value, returned
  72    * by the {@link CurrentHelper#id}, normally
  73    * "IDL:omg.org/PortableServer/Current:2.3".
  74    */
  75   public String[] _ids()
  76   {
  77     return new String[] { CurrentHelper.id() };
  78   }
  79
  80   /**
  81    * Get the object id, associated with the thread currently being served.
  82    *
  83    * @throws NoContext if the current thread is not associated with any
  84    * object.
  85    */
  86   public byte[] get_object_id()
  87                        throws NoContext
  88   {
  89     CurrentOperations r;
  90     synchronized (threads)
  91       {
  92         r = (CurrentOperations) threads.get(Thread.currentThread().getName());
  93       }
  94     if (r != null)
  95       return r.get_object_id();
  96     else
  97       throw new NoContext(Thread.currentThread().getName());
  98   }
  99
 100   /**
 101    * Get the object POA, associated with the thread currently being served.
 102    *
 103    * @throws NoContext if the current thread is not associated with any
 104    * object.
 105    */
 106   public POA get_POA()
 107               throws NoContext
 108   {
 109     CurrentOperations r;
 110     synchronized (threads)
 111       {
 112         r = (CurrentOperations) threads.get(Thread.currentThread().getName());
 113       }
 114     if (r != null)
 115       return r.get_POA();
 116     else
 117       throw new NoContext(Thread.currentThread().getName());
 118   }
 119
 120   /**
 121    * Add the entry to the map.
 122    */
 123   public void put(Thread t, CurrentOperations record)
 124   {
 125     synchronized (threads)
 126       {
 127         threads.put(t.getName(), record);
 128       }
 129   }
 130
 131   /**
 132    * Check if this Poa has some running threads.
 133    */
 134   public boolean has(POA poa)
 135   {
 136     synchronized (threads)
 137       {
 138         Iterator iter = threads.entrySet().iterator();
 139         while (iter.hasNext())
 140           {
 141             Map.Entry item = (Map.Entry) iter.next();
 142             try
 143               {
 144                 if (((CurrentOperations) item.getValue()).get_POA() == poa)
 145                   {
 146                     return true;
 147                   }
 148               }
 149             catch (NoContext ex)
 150               {
 151                 throw new InternalError();
 152               }
 153           }
 154       }
 155     return false;
 156   }
 157
 158   /**
 159    * Check if this thread is registered.
 160    */
 161   public boolean has(Thread t)
 162   {
 163     synchronized (threads)
 164       {
 165         return threads.containsKey(t.getName());
 166       }
 167   }
 168
 169   /**
 170    * Remove the entry from the map.
 171    */
 172   public void remove(Thread t)
 173   {
 174     synchronized (threads)
 175       {
 176         threads.remove(t.getName());
 177       }
 178   }
 179 }