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

  ClientGroup group = new ClientGroup(user);


  try {
      txnScheduler.runTask(new TestAbstractKernelRunnable() {
    public void run() {
        Channel channel = getChannel(channelName);
        ClientSession session =
      (ClientSession) dataService.getBinding(user);
        channel.join(session);
        dataService.removeObject(channel);
        try {
      channel.leave(session);
      fail("Expected IllegalStateException");
        } catch (IllegalStateException e) {
      System.err.println(e);
        }
    }

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    @Test
    public void testChannelLeaveNullClientSession() throws Exception {
  
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    Channel channel =
        channelService.createChannel("x", null, Delivery.RELIABLE);
    try {
        channel.leave((ClientSession) null);
        fail("Expected NullPointerException");
    } catch (NullPointerException e) {
        System.err.println(e);
    }
      }

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  ClientGroup group = new ClientGroup(someUsers);
  
  try {
      txnScheduler.runTask(new TestAbstractKernelRunnable() {
    public void run() {
        Channel channel = getChannel(channelName);
  
        ClientSession moe =
      (ClientSession) dataService.getBinding(MOE);
        channel.join(moe);


        try {
      ClientSession larry =
          (ClientSession) dataService.getBinding(LARRY);
      channel.leave(larry);
      System.err.println("leave of non-member session returned");
      
        } catch (Exception e) {
      System.err.println(e);
      fail("test failed with exception: " + e);
        }
        
    }
       }, taskOwner);


      Thread.sleep(100);
      
      txnScheduler.runTask(new TestAbstractKernelRunnable() {
    public void run() {
        Channel channel = getChannel(channelName);
  
        ClientSession moe =
      (ClientSession) dataService.getBinding(MOE);


        ClientSession larry =

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


    Thread.sleep(100);
    
    txnScheduler.runTask(new TestAbstractKernelRunnable() {
        public void run() {
      Channel channel = getChannel(channelName);
      ClientSession session = getSession(user);
      if (getSessions(channel).contains(session)) {
          fail("Failed to remove session: " + session);
      }}}, taskOwner);
      }
      
      Thread.sleep(1000);
      assertEquals(count, getObjectCount());
      
      txnScheduler.runTask(new TestAbstractKernelRunnable() {
    public void run() {
        Channel channel = getChannel(channelName);


        int numJoinedSessions = getSessions(channel).size();
        if (numJoinedSessions != 0) {
      fail("Expected no sessions, got " + numJoinedSessions);
        }

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    // -- Test Channel.leaveAll --


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

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    @Test
    public void testChannelLeaveAllClosedChannel() throws Exception {
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    Channel channel =
        channelService.createChannel("x", null, Delivery.RELIABLE);
    dataService.removeObject(channel);
    try {
        channel.leaveAll();
        fail("Expected IllegalStateException");
    } catch (IllegalStateException e) {
        System.err.println(e);
    }
      }

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    @Test
    public void testChannelLeaveAllNoSessionsJoined() throws Exception {
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    Channel channel =
        channelService.createChannel("x", null, Delivery.RELIABLE);
    channel.leaveAll();
    System.err.println(
        "leaveAll succeeded with no sessions joined");
      }
  }, taskOwner);
    }

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    private static byte[] testMessage = new byte[] {'x'};


    @Test
    public void testChannelSendAllNoTxn() throws Exception {
  Channel channel = createChannel();
  try {
      channel.send(null, ByteBuffer.wrap(testMessage));
      fail("Expected TransactionNotActiveException");
  } catch (TransactionNotActiveException e) {
      System.err.println(e);
  }
    }

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    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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