Examples of org.jgroups.stack.NakReceiverWindow

org.jgroups.stack.NakReceiverWindow
Keeps track of messages according to their sequence numbers. Allows messages to be added out of order, and with gaps between sequence numbers. Method remove() removes the first message with a sequence number that is 1 higher than next_to_remove (this variable is then incremented), or it returns null if no message is present, or if no message's sequence number is 1 higher.
When there is a gap upon adding a message, its seqno will be added to the Retransmitter, which (using a timer) requests retransmissions of missing messages and keeps on trying until the message has been received, or the member who sent the message is suspected. There are 3 variables which keep track of messages:
- low: lowest seqno, modified on stable(). On stable(), we purge msgs [low digest.highest_delivered]
- highest_delivered: the highest delivered seqno, updated on remove(). The next message to be removed is highest_delivered + 1
- highest_received: the highest received message, updated on add (if a new message is added, not updated e.g. if a missing msg was received)
Note that the first seqno expected is 1. This design is described in doc/design.NAKACK.txt
Example: 1,2,3,5,6,8: low=1, highest_delivered=2 (or 3, depending on whether remove() was called !), highest_received=8 @author Bela Ban May 27 1999, May 2004, Jan 2007 @author John Georgiadis May 8 2001 @version $Id: NakReceiverWindow.java,v 1.61 2008/10/08 12:41:32 belaban Exp $




    @Test(dataProvider="createTimer")
    public void test2(TimeScheduler timer) throws Exception {
        try {
            NakReceiverWindow win=new NakReceiverWindow(sender, cmd, 100, timer);
            check(win, 0, 100, 100);
        }
        finally {
            timer.stop();
        }

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    @Test(dataProvider="createTimer")
    public void test3(TimeScheduler timer) throws Exception {
        try {
            NakReceiverWindow win=new NakReceiverWindow(sender, cmd, 0, timer);
            win.add(1, new Message());
            assert win.get(1) != null;
            check(win, 0, 1, 0);
            win.add(2, new Message());
            check(win, 0, 2, 0);
            assert win.get(2) != null;
            win.remove();
            check(win, 0, 2, 1);
            win.remove();
            check(win, 0, 2, 2);
        }
        finally {
            timer.stop();
        }

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    @Test(dataProvider="createTimer")
    public void test4(TimeScheduler timer) throws Exception {
        try {
            NakReceiverWindow win=new NakReceiverWindow(sender, cmd, 1, timer);
            win.add(2, new Message());
            check(win, 0, 2, 1);
        }
        finally {
            timer.stop();
        }

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    @Test(dataProvider="createTimer")
    public void test5(TimeScheduler timer) throws Exception {
        try {
            NakReceiverWindow win=new NakReceiverWindow(sender, cmd, 100, timer);
            win.add(101, new Message());
            win.add(100, new Message());
            check(win, 0, 101, 100);
        }
        finally {
            timer.stop();
        }

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    @Test(dataProvider="createTimer")
    public void test6(TimeScheduler timer) throws Exception {
        try {
            NakReceiverWindow win=new NakReceiverWindow(sender, cmd, 100, timer);
            win.add(101, new Message());
            System.out.println("win: " + win);
            win.add(100, new Message());
            System.out.println("win: " + win);
            check(win, 0, 101, 100);
            win.remove();
            System.out.println("win: " + win);
            check(win, 0, 101, 101);
            while((win.remove()) != null);
            check(win, 0, 101, 101);
        }
        finally {
            timer.stop();
        }

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    @Test(dataProvider="createTimer")
    public void testLowerBounds(TimeScheduler timer) {
        try {
            NakReceiverWindow win=new NakReceiverWindow(sender, cmd, 100, 50, timer);
            win.add(101, new Message());
            System.out.println("win: " + win);
            win.add(100, new Message());
            System.out.println("win: " + win);
            check(win, 50, 101, 100);
            win.remove();
            System.out.println("win: " + win);
            check(win, 50, 101, 101);
            while((win.remove()) != null);
            check(win, 50, 101, 101);
        }
        finally {
            timer.stop();
        }

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    @Test(dataProvider="createTimer")
    public void test7(TimeScheduler timer) throws Exception {
        try {
            NakReceiverWindow win=new NakReceiverWindow(sender, cmd, 0, timer);
            win.add(1, new Message());
            win.add(2, new Message());
            win.add(3, new Message());
            win.add(4, new Message());
            check(win, 0, 4, 0);
            System.out.println("Note that the subsequent warning is expected:");
            win.stable(4); // no-op because we haven't even removed 4 messages
            check(win, 0, 4, 0);
            while(win.remove() != null);
            check(win, 0, 4, 4);
            win.stable(4);
            check(win, 4, 4, 4);
        }
        finally {
            timer.stop();
        }

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    @Test(dataProvider="createTimer")
    public void testLowerBounds2(TimeScheduler timer) throws Exception {
        try {
            NakReceiverWindow win=new NakReceiverWindow(sender, cmd, 100, 50, timer);
            win.add(100, new Message());
            win.add(101, new Message());
            win.add(102, new Message());
            win.add(103, new Message());
            System.out.println("win: " + win);
            check(win, 50, 103, 100);
            System.out.println("Note that the subsequent warning is expected:");
            win.stable(103); // no-op because we haven't even removed 4 messages
            check(win, 50, 103, 100);
            while(win.remove() != null);
            check(win, 50, 103, 103);
            win.stable(103);
            System.out.println("win: " + win);
            check(win, 103, 103, 103);
        }
        finally {
            timer.stop();

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    @Test(dataProvider="createTimer")
    public void test8(TimeScheduler timer) throws Exception {
        try {
            NakReceiverWindow win=new NakReceiverWindow(sender, cmd, 0, timer);
            win.add(1, new Message());
            win.add(2, new Message());
            win.add(3, new Message());
            win.add(4, new Message());
            win.add(6, new Message());
            check(win, 0, 6, 0); // haven't delivered a message yet
            while(win.remove() != null);
            check(win, 0, 6, 4);
            win.add(5, new Message());
            check(win, 0, 6, 4);
            win.remove();
            check(win, 0, 6, 5);
            win.remove();
            check(win, 0, 6, 6);
            win.stable(4);
            check(win, 4, 6, 6);
            win.stable(6);
            check(win, 6, 6, 6);
        }
        finally {
            timer.stop();
        }

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    @Test(dataProvider="createTimer")
    public void testAdd(TimeScheduler timer) throws Exception {
        try {
            NakReceiverWindow win=new NakReceiverWindow(sender, cmd, 0, timer);
            check(win, 0, 0, 0);
            win.add(0, new Message()); // discarded, next expected is 1
            check(win, 0, 0, 0);
            win.add(1, new Message());
            check(win, 0, 1, 0);
            win.add(2, new Message());
            win.add(3, new Message());
            win.add(4, new Message());
            check(win, 0, 4, 0);
            win.add(6, new Message());
            check(win, 0, 6, 0);
            win.add(5, new Message());
            check(win, 0, 6, 0);
            while(win.remove() != null) ;
            check(win, 0, 6, 6);
            win.stable(4);
            check(win, 4, 6, 6);
            win.stable(6);
            check(win, 6, 6, 6);
        }
        finally {
            timer.stop();
        }

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org.jgroups.Message

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org.jgroups.protocols.UNICAST2

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