temporarytopic.java

一个类似于openJMS分布在ObjectWeb之下的JMS消息中间件。

/*
 * JORAM: Java(TM) Open Reliable Asynchronous Messaging
 * Copyright (C) 2001 - ScalAgent Distributed Technologies
 * Copyright (C) 1996 - Dyade
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA.
 *
 * Initial developer(s): Frederic Maistre (INRIA)
 * Contributor(s): Nicolas Tachker (ScalAgent)
 */
package com.scalagent.kjoram;

import com.scalagent.kjoram.jms.TempDestDeleteRequest;

import java.util.Vector;
import java.util.Hashtable;

import com.scalagent.kjoram.excepts.JMSException;
import com.scalagent.kjoram.excepts.JMSSecurityException;


public class TemporaryTopic extends Topic
{
  /** The connection the topic belongs to, <code>null</code> if not known. */
  private Connection cnx;

  /** 
   * Constructs a temporary topic.
   *
   * @param agentId  Identifier of the topic agent.
   * @param cnx  The connection the queue belongs to, <code>null</code> if
   *          not known. 
   */
  public TemporaryTopic(String agentId, Connection cnx)
  {
    super(agentId);
    this.cnx = cnx;
  }

  /** 
   * Constructs an empty temporary topic.
   */
  public TemporaryTopic()
  {}

  /** Returns a String image of the topic. */
  public String toString()
  {
    return "TempTopic:" + agentId;
  }

  /**
   * API method.
   *
   * @exception IllegalStateException  If the connection is closed or broken.
   * @exception JMSException  If the request fails for any other reason.
   */
  public void delete() throws JMSException
  {
    if (cnx == null)
      throw new JMSSecurityException("Forbidden call as this TemporaryQueue"
                                     + " does not belong to this connection.");

    if (JoramTracing.dbgClient)
      JoramTracing.log(JoramTracing.DEBUG, "--- " + this
                       + ": deleting...");

    // Checking the connection's subscribers:
    Session sess;
    MessageConsumer cons;
    for (int i = 0; i < cnx.sessions.size(); i++) {
      sess = (Session) cnx.sessions.elementAt(i);
      for (int j = 0; j < sess.consumers.size(); j++) {
        cons = (MessageConsumer) sess.consumers.elementAt(j);
        if (agentId.equals(cons.targetName))
          throw new JMSException("Subscribers still exist"
                                 + " for this temp. topic.");
      }
    }
    // Sending the request to the server:
    cnx.syncRequest(new TempDestDeleteRequest(agentId));

    if (JoramTracing.dbgClient)
      JoramTracing.log(JoramTracing.DEBUG, this + ": deleted.");
  }

  /**
   * Returns the connection this temporary topic belongs to,
   * <code>null</code> if not known.
   */
  Connection getCnx()
  {
    return cnx;
  }

  public Hashtable code() {
     return super.code();
  }

  public static Object decode(Hashtable h) {
    TemporaryTopic ret = new TemporaryTopic();
    ret.setAgentId((String) h.get("agentId"));
    //ret.setId(ret.getClass().getName() + ":" + agentId);
    ret.addInstanceTable(ret.getId(), ret);
    return ret;
  }
}