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


    // -- Test Channel.getSessions --


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

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  }
    }


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

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    @Test
    public void testChannelGetSessionsNoSessionsJoined() throws Exception {
  txnScheduler.runTask(new TestAbstractKernelRunnable() {
      public void run() {
    String name = "foo";
    Channel channel = channelService.createChannel(
        name, null, Delivery.RELIABLE);
    if (channel.getSessions().hasNext()) {
        fail("Expected no sessions joined");
    }
    System.err.println("no sessions joined");
      }
  }, taskOwner);

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  try {
      joinUsers("foo", someUsers);
      checkUsersJoined("foo", someUsers);
      txnScheduler.runTask(new TestAbstractKernelRunnable() {
    public void run() {
        Channel channel = channelService.getChannel(channelName);
        List<String> users =
      new ArrayList<String>(Arrays.asList(someUsers));
        Iterator<ClientSession> iter = channel.getSessions();
        while (iter.hasNext()) {
      ClientSession session = iter.next();
      if (!(session instanceof ClientSessionWrapper)) {
          fail("session not ClientSessionWrapper instance: " +
         session);

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    @Test
    public void testChannelGetSessionsClosedChannel() 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.getSessions();
        fail("Expected IllegalStateException");
    } catch (IllegalStateException e) {
        System.err.println(e);
    }
      }

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    // -- Test Channel.join --


    @Test
    public void testChannelJoinNoTxn() throws Exception {
  Channel channel = createChannel();
  DummyClient client = newClient();
  try {
      channel.join(client.getSession());
      fail("Expected TransactionNotActiveException");
  } catch (TransactionNotActiveException e) {
      System.err.println(e);
  } finally {
      if (client != null) {

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    public void testChannelJoinClosedChannel() throws Exception {
  final DummyClient client = newClient();
  try {
      txnScheduler.runTask(new TestAbstractKernelRunnable() {
    public void run() throws Exception {
        Channel channel =
      channelService.createChannel(
          "x", null, Delivery.RELIABLE);
        dataService.removeObject(channel);
        try {
      channel.join(client.getSession());
      fail("Expected IllegalStateException");
        } catch (IllegalStateException e) {
      System.err.println(e);
        }
    }

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

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    // -- Test Channel.leave --


    @Test
    public void testChannelLeaveNoTxn() throws Exception {
  Channel channel = createChannel();
  DummyClient client = newClient();
  try {
      channel.leave(client.getSession());
      fail("Expected TransactionNotActiveException");
  } catch (TransactionNotActiveException e) {
      System.err.println(e);
  } finally {
      if (client != null) {

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    @Test
    public void testChannelLeaveMismatchedTxn() throws Exception {
  // TBD: should the implementation work this way?
  final String channelName = "test";
  final Channel channel = createChannel(channelName);
  final DummyClient client = newClient();
  try {
      txnScheduler.runTask(new TestAbstractKernelRunnable() {
    public void run() throws Exception {
        try {
      channel.leave(client.getSession());
      fail("Expected TransactionNotActiveException");
        } catch (TransactionNotActiveException e) {
      System.err.println(e);
        }
    }

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