Examples of com.sun.sgs.app.Channel

com.sun.sgs.app.Channel
Interface representing a communication group, a {@code Channel}, consisting of multiple client sessions. Classes that implement {@code Channel} must also implement {@link Serializable}.
A channel is created by invoking the {@link ChannelManager#createChannel ChannelManager.createChannel} method with aname, a {@code ChannelListener}, and a {@link Delivery} guarantee. A{@link ClientSession} can be added or removed from a channel using that{@code Channel}'s {@link #join(ClientSession) join} and {@link #leave(ClientSession) leave} methods respectively. All client sessionscan be removed from a channel by invoking {@link #leaveAll leaveAll} onthe channel. To explicitly close a {@code Channel}, remove the {@code Channel} object from the data manager using the {@link DataManager#removeObject DataManager.removeObject} method.
The server can send a message to all client sessions joined to a channel by using the {@link #send send} method. Note that the methodsof this interface are invoked within the context of an executing {@link Task}; as a result, a message sent to client sessions using the {@code send} method will not be sent until after its corresponding taskcompletes.
Messages sent on a channel are delivered in a manner that satisfies the channel's delivery guarantee, specified at creation time. When possible, channel messages are delivered using the most efficient means to satisfy the delivery guarantee. However, a stronger delivery guarantee may be used to deliver the message if the underlying protocol only supports stronger delivery guarantees. A client session can not be joined to a channel if that client session does not support a protocol satisfying the minimum requirements of the channel's delivery guarantee.
A client session joined to one or more channels may become disconnected due to the client logging out or due to other factors such as forced disconnection or network failure. If a client session becomes disconnected, then that client session is removed from each channel that it is a member of.
When the application is finished using a channel, the application should remove the channel from the data manager, which closes the channel and releases all resources associated with the channel. @see ChannelManager#createChannel ChannelManager.createChannel

        
        // We were passed a reference to the first channel.
        channel1.get().join(session);
        
        // We look up the second channel by name.
        Channel channel2 = channelMgr.getChannel(HelloChannels.CHANNEL_2_NAME);
        channel2.join(session);
    }

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     */
    public void initialize(Properties props) {
        ChannelManager channelMgr = AppContext.getChannelManager();
        
        // Create and keep a reference to the first channel.
        Channel c1 = channelMgr.createChannel(CHANNEL_1_NAME, 
                                              null, 
                                              Delivery.RELIABLE);
        channel1 = AppContext.getDataManager().createReference(c1);
        
        // We don't keep a reference to the second channel, to demonstrate

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     */
    protected void openChannel() {
        CellMO cell = cellRef.get();


        ChannelManager cm = AppContext.getChannelManager();
        Channel cellChannel = cm.createChannel("Cell "+cell.getCellID().toString(),
                                               null,
                                               Delivery.RELIABLE);


        DataManager dm = AppContext.getDataManager();
        cellChannelRef = dm.createReference(cellChannel);

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    /**
     * Close the channel for this component.
     */
    protected void closeChannel() {
        DataManager dm = AppContext.getDataManager();
        Channel channel = cellChannelRef.get();
        dm.removeObject(channel);


        cellSender=null;
        cellChannelRef = null;
    }

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            ChannelManager cm = AppContext.getChannelManager();
            
            ClientSessionSet sessions = new ClientSessionSet();
            String channelName = handler.getConnectionType().toString() + 
                                 "(" + String.valueOf(assignID) + ")";
            Channel channel = cm.createChannel(channelName, 
                                               null,
                                               Delivery.RELIABLE);


            // mark ourself for udate
            dm.markForUpdate(this);

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         ChannelListener listener,
         Delivery delivery)
    {
        serviceStats.createChannelOp.report();
  try {
      Channel channel = ChannelImpl.newInstance(
    name, listener, delivery, writeBufferSize);
      return channel;
      
  } catch (RuntimeException e) {
      logger.logThrow(Level.FINEST, e, "createChannel:{0} throws");

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        // We were passed a reference to the first channel.
        channel1.get().join(session);
        
        // We look up the second channel by name.
        Channel channel2 = channelMgr.getChannel(HelloChannels.CHANNEL_2_NAME);
        channel2.join(session);
    }

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     */
    public void initialize(Properties props) {
        ChannelManager channelMgr = AppContext.getChannelManager();
        
        // Create and keep a reference to the first channel.
        Channel c1 = channelMgr.createChannel(CHANNEL_1_NAME, 
                                              null, 
                                              Delivery.RELIABLE);
        channel1 = AppContext.getDataManager().createReference(c1);
        
        // We don't keep a reference to the second channel, to demonstrate

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      if (action.equals("join")) {
    String channelName = buf.getString();
    System.err.println("DummyClientSessionListener: join request, " +
           "channel name: " + channelName +
           ", user: " + name);
    Channel channel =
        (Channel) dataManager.getBinding(channelName);
    channel.join(session);
    session.send(message.asReadOnlyBuffer());
      } else if (action.equals("leave")) {
    String channelName = buf.getString();
    System.err.println("DummyClientSessionListener: leave request, " +
           "channel name: " + channelName +
           ", user: " + name);
    Channel channel =
        (Channel) dataManager.getBinding(channelName);
    channel.leave(session);
    session.send(message.asReadOnlyBuffer());
      } else {
    System.err.println("DummyClientSessionListener: UNKNOWN request, " +
           "action: " +  action +
           ", user: " + name);

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    public void testChannelSendAllClosedChannel() throws Exception {
  final String channelName = "test";
  createChannel(channelName);
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    Channel channel = getChannel(channelName);
    dataService.removeObject(channel);
    try {
        channel.send(null, ByteBuffer.wrap(testMessage));
        fail("Expected IllegalStateException");
    } catch (IllegalStateException e) {
        System.err.println(e);
    }
      }

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