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

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

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    ChannelListener listener =
        new ValidatingChannelListener();
    dataService.setBinding(listenerName, listener);
    ClientSession session =
        (ClientSession) dataService.getBinding(user);
    Channel channel =
        channelService.createChannel(
      channelName, listener, Delivery.RELIABLE);
    channel.join(session);
      }
  }, taskOwner);


  // Wait for the client to join, and then send a channel message.
  client.assertJoinedChannel(channelName);

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  int numIterations = 100;
  long startTime = System.currentTimeMillis();
  for (int i = 0; i < numIterations; i++) {
      txnScheduler.runTask(new TestAbstractKernelRunnable() {
    public void run() {
        Channel channel = channelService.getChannel(channelName);
        DataManager dataManager = AppContext.getDataManager();
        ClientSession session = (ClientSession)
      dataManager.getBinding(sessionKey);
        channel.join(session);
        channel.leave(session);
    }}, taskOwner);
  }
  long endTime = System.currentTimeMillis();
  System.err.println("join/leave, iterations: " + numIterations +
         ", elapsed time: " + (endTime - startTime) +

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    // -- Test Channel.close --


    @Test
    public void testChannelCloseNoTxn() throws Exception {
  Channel channel = createChannel();
  try {
      dataService.removeObject(channel);
      fail("Expected TransactionNotActiveException");
  } catch (TransactionNotActiveException e) {
      System.err.println(e);

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  int count = getObjectCount();
  createChannel(channelName);
  printServiceBindings("after channel create");
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    Channel channel = getChannel(channelName);
    dataService.removeObject(channel);
      }
  }, taskOwner);
  Thread.sleep(100);
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    Channel channel = getChannel(channelName);
    if (getChannel(channelName) != null) {
        fail("obtained closed channel");
    }
      }
  }, taskOwner);

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  int count = getObjectCount();
  // Create channel with managed ChannelListener.
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    ManagedChannelListener listener = new ManagedChannelListener();
    Channel channel = AppContext.getChannelManager().
        createChannel(channelName, listener, Delivery.RELIABLE);
    DataManager dataManager = AppContext.getDataManager();
    dataManager.setBinding(channelName, channel);
    dataManager.setBinding(listenerName, listener);
      }
  }, taskOwner);
  printServiceBindings("after channel create");
  // Remove managed channel listener and close channel.
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    DataManager dataManager = AppContext.getDataManager();
    ManagedChannelListener listener = (ManagedChannelListener)
        dataManager.getBinding(listenerName);
    Channel channel = (Channel) dataManager.getBinding(channelName);
    dataManager.removeBinding(listenerName);
    if (removeListener) {
        dataManager.removeObject(listener);
    }
    dataManager.removeObject(channel);
      }
  }, taskOwner);
  Thread.sleep(100);
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    Channel channel = getChannel(channelName);
    if (getChannel(channelName) != null) {
        fail("obtained closed channel");
    }
      }
  }, taskOwner);

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      client.sendChannelMessage(channelName, 0);
      checkChannelMessagesReceived(client, channelName, 1);
  
      txnScheduler.runTask(new TestAbstractKernelRunnable() {
    public void run() {
        Channel channel = getChannel(channelName);
        dataService.removeObject(channel);
    } }, taskOwner);
      Thread.sleep(100);
      txnScheduler.runTask(new TestAbstractKernelRunnable() {
          public void run() {
        Channel channel = getChannel(channelName);
        if (getChannel(channelName) != null) {
      fail("obtained closed channel");
        }
    } }, taskOwner);
      printServiceBindings("after channel close");

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    private void closeChannel(final String name) throws Exception {


  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    Channel channel = channelService.getChannel(name);
    dataService.removeObject(channel);
      }}, taskOwner);
    }

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  final String channelName, final String... users)
  throws Exception
    {
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    Channel channel = getChannel(channelName);
    for (String user : users) {
        ClientSession session =
      (ClientSession) dataService.getBinding(user);
        channel.join(session);
    }
      }
  }, taskOwner);
    }

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   final String channelName, final String... users)
  throws Exception
    {
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    Channel channel = getChannel(channelName);
    for (String user : users) {
        ClientSession session =
      (ClientSession) dataService.getBinding(user);
        channel.leave(session);
    }
      }
  }, taskOwner);
    }

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