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

  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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      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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    @Test
    public void testChannelWriteReadObject() throws Exception {
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() throws Exception {
    Channel savedChannel =
        channelService.createChannel("x", null, Delivery.RELIABLE);
    ByteArrayOutputStream bout = new ByteArrayOutputStream();
    ObjectOutputStream out = new ObjectOutputStream(bout);
    out.writeObject(savedChannel);
    out.flush();
    out.close();
    
    ByteArrayInputStream bin =
        new ByteArrayInputStream(bout.toByteArray());
    ObjectInputStream in = new ObjectInputStream(bin);
    Channel channel = (Channel) in.readObject();


    if (!savedChannel.equals(channel)) {
        fail("Expected channel: " + savedChannel +
       ", got " + channel);
    }

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    // -- Test Channel.getName --


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

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  }
    }


    @Test
    public void testChannelGetNameMismatchedTxn() throws Exception {
  final Channel channel = createChannel();
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    try {
        channel.getName();
        fail("Expected TransactionNotActiveException");
    } catch (TransactionNotActiveException e) {
        System.err.println(e);
    }
      }

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    @Test
    public void testChannelGetName() throws Exception {
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    String name = "foo";
    Channel channel = channelService.createChannel(
        name, null, Delivery.RELIABLE);
    if (!name.equals(channel.getName())) {
        fail("Expected: " + name + ", got: " + channel.getName());
    }
      }
  }, taskOwner);
    }

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

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