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/* SocketRepository.java --

   Copyright (C) 2005 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.CORBA;

import java.net.Socket;

import java.net.SocketException;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

/**

 * This class caches the opened sockets that are reused during the

 * frequent calls. Otherwise, some CORBA applications may spend

 * up to 90 % of the working time just for closing and opening the sockets.

 *

 * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)

 */

public class SocketRepository

{

  /**

   * The socket map.

   */

  private static HashMap sockets = new HashMap();

  /**

   * Put a socket. This method also discards all not reusable sockets from

   * the map.

   *

   * @param key as socket key.

   *

   * @param s a socket.

   */

  public static void put_socket(Object key, Socket s)

  {

    synchronized (sockets)

      {

        sockets.put(key, s);

        gc();

      }

  }

  /**

   * Removes all non reusable sockets. As it is private,

   * we know we call from the synchronized code already.

   */

  private static void gc()

  {

    Iterator iter = sockets.entrySet().iterator();

    Map.Entry e;

    Socket sx;

    while (iter.hasNext())

      {

        e = (Map.Entry) iter.next();

        sx = (Socket) e.getValue();

        if (not_reusable(sx))

          iter.remove();

      }

  }

  /**

   * Return true if the socket is no longer reusable.

   */

  static boolean not_reusable(Socket s)

  {

    return (s.isClosed() || !s.isBound() || !s.isConnected() ||

        s.isInputShutdown() || s.isOutputShutdown());

  }

  /**

   * Get a socket.

   *

   * @param key a socket key.

   *

   * @return an opened socket for reuse, null if no such available or it is

   * closed, its input or output has been shutown or otherwise the socket is not

   * reuseable.

   */

  public static Socket get_socket(Object key)

  {

    if (true)

      return null;

    synchronized (sockets)

      {

        Socket s = (Socket) sockets.get(key);

        if (s == null)

          return null;

        // Ensure that the socket is fully reusable.

        else if (not_reusable(s))

          {

            sockets.remove(key);

            return null;

          }

        else

          {

            try

              {

                // Set one minute time out that will be changed later.

                s.setSoTimeout(60 * 1000);

              }

            catch (SocketException e)

              {

                s = null;

              }

            sockets.remove(key);

            return s;

          }

      }

  }

}