Subversion Repositories openrisc

/* gnuPoaCurrent.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.Poa;

import org.omg.CORBA.CurrentHelper;

import org.omg.CORBA.portable.ObjectImpl;

import org.omg.PortableServer.Current;

import org.omg.PortableServer.CurrentOperations;

import org.omg.PortableServer.CurrentPackage.NoContext;

import org.omg.PortableServer.POA;

import java.util.Iterator;

import java.util.Map;

import java.util.TreeMap;

/**

 * Supports the "Poa current" concept, providing the id and poa of

 * the object currently being served. There is only one instance

 * of this class per ORB. It maintains a thread to information map.

 *

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

 */

public class gnuPoaCurrent

  extends ObjectImpl

  implements Current

{

  /**

   * The table, mapping threads to records.

   */

  private TreeMap threads = new TreeMap();

  /**

   * Get the array of POA current repository ids.

   *

   * @return a single member array, containing value, returned

   * by the {@link CurrentHelper#id}, normally

   * "IDL:omg.org/PortableServer/Current:2.3".

   */

  public String[] _ids()

  {

    return new String[] { CurrentHelper.id() };

  }

  /**

   * Get the object id, associated with the thread currently being served.

   *

   * @throws NoContext if the current thread is not associated with any

   * object.

   */

  public byte[] get_object_id()

                       throws NoContext

  {

    CurrentOperations r;

    synchronized (threads)

      {

        r = (CurrentOperations) threads.get(Thread.currentThread().getName());

      }

    if (r != null)

      return r.get_object_id();

    else

      throw new NoContext(Thread.currentThread().getName());

  }

  /**

   * Get the object POA, associated with the thread currently being served.

   *

   * @throws NoContext if the current thread is not associated with any

   * object.

   */

  public POA get_POA()

              throws NoContext

  {

    CurrentOperations r;

    synchronized (threads)

      {

        r = (CurrentOperations) threads.get(Thread.currentThread().getName());

      }

    if (r != null)

      return r.get_POA();

    else

      throw new NoContext(Thread.currentThread().getName());

  }

  /**

   * Add the entry to the map.

   */

  public void put(Thread t, CurrentOperations record)

  {

    synchronized (threads)

      {

        threads.put(t.getName(), record);

      }

  }

  /**

   * Check if this Poa has some running threads.

   */

  public boolean has(POA poa)

  {

    synchronized (threads)

      {

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

        while (iter.hasNext())

          {

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

            try

              {

                if (((CurrentOperations) item.getValue()).get_POA() == poa)

                  {

                    return true;

                  }

              }

            catch (NoContext ex)

              {

                throw new InternalError();

              }

          }

      }

    return false;

  }

  /**

   * Check if this thread is registered.

   */

  public boolean has(Thread t)

  {

    synchronized (threads)

      {

        return threads.containsKey(t.getName());

      }

  }

  /**

   * Remove the entry from the map.

   */

  public void remove(Thread t)

  {

    synchronized (threads)

      {

        threads.remove(t.getName());

      }

  }

}