Examples of org.jgroups.stack.DefaultRetransmitter

org.jgroups.stack.DefaultRetransmitter

Maintains a pool of sequence numbers of messages that need to be retransmitted. Messages are aged and retransmission requests sent according to age (configurable backoff). If a TimeScheduler instance is given to the constructor, it will be used, otherwise Reransmitter will create its own. The retransmit timeouts have to be set first thing after creating an instance. The add() method adds the sequence numbers of messages to be retransmitted. The remove() method removes a sequence number again, cancelling retransmission requests for it. Whenever a message needs to be retransmitted, the RetransmitCommand.retransmit() method is called. It can be used e.g. by an ack-based scheme (e.g. AckSenderWindow) to retransmit a message to the receiver, or by a nak-based scheme to send a retransmission request to the sender of the missing message.
Changes Aug 2007 (bela): the retransmitter was completely rewritten. Entry was removed, instead all tasks are directly placed into a hashmap, keyed by seqnos. When a message has been received, we simply remove the task from the hashmap and cancel it. This simplifies the code and avoids having to iterate through the (previous) message list linearly on removal. Performance is about the same, or slightly better in informal tests. @author Bela Ban




    @BeforeMethod
    void initTimer() {
        timer=new DefaultTimeScheduler();
        xmitter=new DefaultRetransmitter(sender, new MyXmitter(), timer);
        xmitter.setRetransmitTimeouts(new StaticInterval(1000,2000,4000,8000));
        xmitter.reset();
    }




    @DataProvider(name="createRetransmitter")
    protected Retransmitter[][] createRetransmitter() {
        Retransmitter range_based_retransmitter=new RangeBasedRetransmitter(sender, new MyXmitter(), timer);
        Retransmitter old_retransmitter=new DefaultRetransmitter(sender, new MyXmitter(), timer);


        range_based_retransmitter.setRetransmitTimeouts(new ExponentialInterval(1000));
        range_based_retransmitter.reset();
        old_retransmitter.setRetransmitTimeouts(new ExponentialInterval(1000));
        old_retransmitter.reset();


        return new Retransmitter[][] {
          {old_retransmitter},
          {range_based_retransmitter}
        };

Examples of org.jgroups.stack.DefaultRetransmitter

Related Classes of org.jgroups.stack.DefaultRetransmitter