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    */
_ids()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    */
get_object_id()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    */
get_POA()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    */
put(Thread t, CurrentOperations record)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    */
has(POA poa)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    */
has(Thread t)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    */
remove(Thread t)172   public void remove(Thread t)
173   {
174     synchronized (threads)
175       {
176         threads.remove(t.getName());
177       }
178   }
179 }
180