/**
   * Closes given {@link #transportManagers} of this <tt>Conference</tt> and removes corresponding
   * channel bundle.
   */
  void closeTransportManager(TransportManager transportManager) {
    synchronized (transportManagers) {
      for (Iterator<IceUdpTransportManager> i = transportManagers.values().iterator();
          i.hasNext(); ) {
        if (i.next() == transportManager) {
          i.remove();
          // Presumably, we have a single association for
          // transportManager.
          break;
        }
      }

      // Close manager
      try {
        transportManager.close();
      } catch (Throwable t) {
        logger.warn(
            "Failed to close an IceUdpTransportManager of" + " conference " + getID() + "!", t);
        // The whole point of explicitly closing the
        // transportManagers of this Conference is to prevent memory
        // leaks. Hence, it does not make sense to possibly leave
        // TransportManagers open because a TransportManager has
        // failed to close.
        if (t instanceof InterruptedException) Thread.currentThread().interrupt();
        else if (t instanceof ThreadDeath) throw (ThreadDeath) t;
      }
    }
  }
  /**
   * Expires this <tt>Conference</tt>, its <tt>Content</tt>s and their respective <tt>Channel</tt>s.
   * Releases the resources acquired by this instance throughout its life time and prepares it to be
   * garbage collected.
   */
  public void expire() {
    synchronized (this) {
      if (expired) return;
      else expired = true;
    }

    EventAdmin eventAdmin = videobridge.getEventAdmin();
    if (eventAdmin != null) eventAdmin.sendEvent(EventFactory.conferenceExpired(this));

    setRecording(false);
    if (recorderEventHandler != null) {
      recorderEventHandler.close();
      recorderEventHandler = null;
    }

    Videobridge videobridge = getVideobridge();

    try {
      videobridge.expireConference(this);
    } finally {
      // Expire the Contents of this Conference.
      for (Content content : getContents()) {
        try {
          content.expire();
        } catch (Throwable t) {
          logger.warn(
              "Failed to expire content " + content.getName() + " of conference " + getID() + "!",
              t);
          if (t instanceof InterruptedException) Thread.currentThread().interrupt();
          else if (t instanceof ThreadDeath) throw (ThreadDeath) t;
        }
      }

      // Close the transportManagers of this Conference. Normally, there
      // will be no TransportManager left to close at this point because
      // all Channels have expired and the last Channel to be removed from
      // a TransportManager closes the TransportManager. However, a
      // Channel may have expired before it has learned of its
      // TransportManager and then the TransportManager will not close.
      closeTransportManagers();

      if (logger.isInfoEnabled()) {
        logger.info(
            "Expired conference " + getID() + ". " + videobridge.getConferenceCountString());
      }
    }
  }
  /**
   * Implements {@link PacketListener}. Notifies this instance that a specific {@link Packet} (which
   * this instance has already expressed interest into by returning <tt>true</tt> from {@link
   * #accept(Packet)}) has been received.
   *
   * @param packet the <tt>Packet</tt> which has been received and which this instance is given a
   *     chance to process
   */
  public void processPacket(Packet packet) {
    /*
     * As we do elsewhere, acknowledge the receipt of the Packet first and
     * then go about our business with it.
     */
    IQ iq = (IQ) packet;

    if (iq.getType() == IQ.Type.SET)
      protocolProvider.getConnection().sendPacket(IQ.createResultIQ(iq));

    /*
     * Now that the acknowledging is out of the way, do go about our
     * business with the Packet.
     */
    ColibriConferenceIQ conferenceIQ = (ColibriConferenceIQ) iq;
    boolean interrupted = false;

    try {
      processColibriConferenceIQ(conferenceIQ);
    } catch (Throwable t) {
      logger.error(
          "An error occurred during the processing of a " + packet.getClass().getName() + " packet",
          t);

      if (t instanceof InterruptedException) {
        /*
         * We cleared the interrupted state of the current Thread by
         * catching the InterruptedException. However, we do not really
         * care whether the current Thread has been interrupted - we
         * caught the InterruptedException because we want to swallow
         * any Throwable. Consequently, we should better restore the
         * interrupted state.
         */
        interrupted = true;
      } else if (t instanceof ThreadDeath) throw (ThreadDeath) t;
    }
    if (interrupted) Thread.currentThread().interrupt();
  }