1 /* SocketRepository.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;
40 
41 import java.net.Socket;
42 import java.net.SocketException;
43 import java.util.Hashtable;
44 import java.util.Iterator;
45 import java.util.Map;
46 
47 /**
48  * This class caches the opened sockets that are reused during the
49  * frequent calls. Otherwise, some CORBA applications may spend
50  * up to 90 % of the working time just for closing and opening the sockets.
51  *
52  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
53  */
54 public class SocketRepository
55 {
56   /**
57    * The socket map.
58    */
59   private static Hashtable sockets = new Hashtable();
60 
61   /**
62    * Put a socket. This method also discards all not reusable sockets from
63    * the map.
64    *
65    * @param key as socket key.
66    *
67    * @param s a socket.
68    */
put_socket(Object key, Socket s)69   public static void put_socket(Object key, Socket s)
70   {
71     sockets.put(key, s);
72     gc();
73   }
74 
75   /**
76    * Removes all non reusable sockets.
77    */
gc()78   public static void gc()
79   {
80     Iterator iter = sockets.entrySet().iterator();
81 
82     Map.Entry e;
83     Socket sx;
84 
85     while (iter.hasNext())
86       {
87         e = (Map.Entry) iter.next();
88         sx = (Socket) e.getValue();
89 
90         if (not_reusable(sx))
91           iter.remove();
92       }
93   }
94 
95   /**
96    * Return true if the socket is no longer reusable.
97    */
not_reusable(Socket s)98   static boolean not_reusable(Socket s)
99   {
100     return (s.isClosed() || !s.isBound() || !s.isConnected() ||
101         s.isInputShutdown() || s.isOutputShutdown());
102   }
103 
104   /**
105    * Get a socket.
106    *
107    * @param key a socket key.
108    *
109    * @return an opened socket for reuse, null if no such available or it is
110    * closed, its input or output has been shutown or otherwise the socket
111    * is not reuseable.
112    */
get_socket(Object key)113   public static Socket get_socket(Object key)
114   {
115     if (true)
116       return null;
117 
118     Socket s = (Socket) sockets.get(key);
119     if (s == null)
120       return null;
121 
122     // Ensure that the socket is fully reusable.
123     else if (not_reusable(s))
124       {
125         sockets.remove(key);
126         return null;
127       }
128     else
129       {
130         try
131           {
132             // Set one minute time out that will be changed later.
133             s.setSoTimeout(60*1000);
134           }
135         catch (SocketException e)
136           {
137             s = null;
138           }
139 
140         sockets.remove(key);
141         return s;
142       }
143   }
144 }