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(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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     * We need to resend our first message with our conn_id
     * @param sender
     */
    private void handleResendingOfFirstMessage(Address sender) {
        Entry entry;
        AckSenderWindow sender_win;
        Message rsp;
        if(log.isTraceEnabled())
            log.trace(local_addr + " <-- SEND_FIRST_SEQNO(" + sender + ")");


        synchronized(connections) {
            entry=connections.get(sender);
            sender_win=entry != null? entry.sent_msgs : null;
            if(sender_win == null) {
                if(log.isErrorEnabled())
                    log.error(local_addr + ": sender window for " + sender + " not found");
                return;
            }
            rsp=sender_win.getLowestMessage();
        }
        if(rsp == null) {
            //if(log.isWarnEnabled())
            // log.warn("didn't find any messages in my sender window for " + sender);
            return;

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                    try {
                        seqno=entry.sent_msgs_seqno;
                        if(seqno == DEFAULT_FIRST_SEQNO) // only happens on the first message
                            entry.send_conn_id=getNewConnectionId();
                        if(entry.sent_msgs == null) // first msg to peer 'dst'
                            entry.sent_msgs=new AckSenderWindow(this, new StaticInterval(timeout), timer, this.local_addr);
                        UnicastHeader hdr=new UnicastHeader(UnicastHeader.DATA, seqno, entry.send_conn_id,
                                                            seqno == DEFAULT_FIRST_SEQNO);
                        msg.putHeader(name, hdr);
                        if(log.isTraceEnabled()) {
                            StringBuilder sb=new StringBuilder();

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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++;
    }

View Full Code Here

     * We need to resend our first message with our conn_id
     * @param sender
     */
    private void handleResendingOfFirstMessage(Address sender) {
        Entry entry;
        AckSenderWindow sender_win;
        Message rsp;
        if(log.isTraceEnabled())
            log.trace(local_addr + " <-- SEND_FIRST_SEQNO(" + sender + ")");


        synchronized(connections) {
            entry=connections.get(sender);
            sender_win=entry != null? entry.sent_msgs : null;
            if(sender_win == null) {
                if(log.isErrorEnabled())
                    log.error("sender window for " + sender + " not found");
                return;
            }
            rsp=sender_win.getLowestMessage();
        }
        if(rsp == null) {
            //if(log.isWarnEnabled())
                // log.warn("didn't find any messages in my sender window for " + sender);
            return;

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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++;
        }
    }

View Full Code Here

     */
    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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    protected void setUp() throws Exception {
        super.setUp();
        timer=new TimeScheduler(10);
        win=new AckSenderWindow(null, new StaticInterval(xmit_timeouts), timer);
    }

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     */
    public void testRetransmits() {
        Entry entry;
        int num_non_correct_entries=0;


        win=new AckSenderWindow(new MyRetransmitCommand(), new StaticInterval(xmit_timeouts), timer);


        // 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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