Examples of org.jgroups.stack.AckSenderWindow

org.jgroups.stack.AckSenderWindow
ACK-based sliding window for a sender. Messages are added to the window keyed by seqno When an ACK is received, the corresponding message is removed. The Retransmitter continously iterates over the entries in the hashmap, retransmitting messages based on their creation time and an (increasing) timeout. When there are no more messages in the retransmission table left, the thread terminates. It will be re-activated when a new entry is added to the retransmission table. @author Bela Ban




    /** Add the ACK to hashtable.sender.sent_msgs */
    private void handleAckReceived(Object sender, long seqno) {
        Entry           entry;
        AckSenderWindow win;


        if(trace)
            log.trace(new StringBuffer().append(local_addr).append(" <-- ACK(").append(sender).
                      append(": #").append(seqno).append(')'));
        synchronized(connections) {
            entry=(Entry)connections.get(sender);
        }
        if(entry == null || entry.sent_msgs == null)
            return;
        win=entry.sent_msgs;
        win.ack(seqno); // removes message from retransmission
        num_acks_received++;
    }

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                synchronized(entry) { // threads will only sync if they access the same entry
                    try {
                        seqno=entry.sent_msgs_seqno;
                        UnicastHeader hdr=new UnicastHeader(UnicastHeader.DATA, seqno);
                        if(entry.sent_msgs == null) { // first msg to peer 'dst'
                            entry.sent_msgs=new AckSenderWindow(this, new StaticInterval(timeout), timer, this.local_addr); // use the global timer
                        }
                        msg.putHeader(name, hdr);
                        if(log.isTraceEnabled())
                            log.trace(new StringBuilder().append(local_addr).append(" --> DATA(").append(dst).append(": #").
                                    append(seqno));

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    /** Add the ACK to hashtable.sender.sent_msgs */
    private void handleAckReceived(Address sender, long seqno) {
        Entry           entry;
        AckSenderWindow win;


        if(log.isTraceEnabled())
            log.trace(new StringBuilder().append(local_addr).append(" <-- ACK(").append(sender).
                      append(": #").append(seqno).append(')'));
        synchronized(connections) {
            entry=connections.get(sender);
        }
        if(entry == null || entry.sent_msgs == null)
            return;
        win=entry.sent_msgs;
        win.ack(seqno); // removes message from retransmission
        num_acks_received++;
    }

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                synchronized(entry) { // threads will only sync if they access the same entry
                    try {
                        seqno=entry.sent_msgs_seqno;
                        UnicastHeader hdr=new UnicastHeader(UnicastHeader.DATA, seqno);
                        if(entry.sent_msgs == null) { // first msg to peer 'dst'
                            entry.sent_msgs=new AckSenderWindow(this, new StaticInterval(timeouts), timer, this.local_addr); // use the global timer
                        }
                        msg.putHeader(name, hdr);
                        if(log.isTraceEnabled())
                            log.trace(new StringBuilder().append(local_addr).append(" --> DATA(").append(dst).append(": #").
                                    append(seqno));

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    /** Add the ACK to hashtable.sender.sent_msgs */
    private void handleAckReceived(Address sender, long seqno) {
        Entry           entry;
        AckSenderWindow win;


        if(log.isTraceEnabled())
            log.trace(new StringBuilder().append(local_addr).append(" <-- ACK(").append(sender).
                      append(": #").append(seqno).append(')'));
        synchronized(connections) {
            entry=connections.get(sender);
        }
        if(entry == null || entry.sent_msgs == null)
            return;
        win=entry.sent_msgs;
        win.ack(seqno); // removes message from retransmission
        num_acks_received++;
    }

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    /** Tests whether retransmits are called at correct times for 1000 messages */
    public void testRetransmits() {
  Entry entry;
  int   num_non_correct_entries=0;


  win=new AckSenderWindow(new MyRetransmitCommand(), new StaticInterval(xmit_timeouts));
  
  // 1. Send NUM_MSGS messages:
  System.out.println("-- sending " + NUM_MSGS + " messages:");
  for(long i=0; i < NUM_MSGS; i++) {
      msgs.put(new Long(i), new Entry());

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    private void handleAckReceived(Address sender, long seqno) {
        if(log.isTraceEnabled())
            log.trace(new StringBuilder().append(local_addr).append(" <-- ACK(").append(sender).
                    append(": #").append(seqno).append(')'));
        SenderEntry entry=send_table.get(sender);
        AckSenderWindow win=entry != null? entry.sent_msgs : null;
        if(win != null) {
            win.ack(seqno); // removes message from retransmission
            num_acks_received++;
        }
    }

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     */
    private void handleResendingOfFirstMessage(Address sender) {
        if(log.isTraceEnabled())
            log.trace(local_addr + " <-- SEND_FIRST_SEQNO(" + sender + ")");
        SenderEntry entry=send_table.get(sender);
        AckSenderWindow win=entry != null? entry.sent_msgs : null;
        if(win == null) {
            if(log.isErrorEnabled())
                log.error(local_addr + ": sender window for " + sender + " not found");
            return;
        }
        Message rsp=win.getLowestMessage();
        if(rsp == null)
            return;


        // We need to copy the UnicastHeader and put it back into the message because Message.copy() doesn't copy
        // the headers and therefore we'd modify the original message in the sender retransmission window

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        final Lock              lock=new ReentrantLock();


        public SenderEntry(long send_conn_id, AckSenderWindow.RetransmitCommand cmd, long[] timeout,
                           TimeScheduler timer, Address local_addr) {
            this.send_conn_id=send_conn_id;
            sent_msgs=new AckSenderWindow(cmd, new StaticInterval(timeout), timer, local_addr);
        }

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    private void handleAckReceived(Address sender, long seqno) {
        if(log.isTraceEnabled())
            log.trace(new StringBuilder().append(local_addr).append(" <-- ACK(").append(sender).
                    append(": #").append(seqno).append(')'));
        SenderEntry entry=send_table.get(sender);
        AckSenderWindow win=entry != null? entry.sent_msgs : null;
        if(win != null) {
            win.ack(seqno); // removes message from retransmission
            num_acks_received++;
        }
    }

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