Examples of org.jgroups.protocols.pbcast.NAKACK$Entry

org.jgroups.protocols.pbcast.NAKACK
Negative AcKnowledgement layer (NAKs). Messages are assigned a monotonically increasing sequence number (seqno). Receivers deliver messages ordered according to seqno and request retransmission of missing messages. Retransmitted messages are bundled into bigger ones, e.g. when getting an xmit request for messages 1-10, instead of sending 10 unicast messages, we bundle all 10 messages into 1 and send it. However, since this protocol typically sits below FRAG, we cannot count on FRAG to fragement/defragment the (possibly) large message into smaller ones. Therefore we only bundle messages up to max_xmit_size bytes to prevent too large messages. For example, if the bundled message size was a total of 34000 bytes, and max_xmit_size=16000, we'd send 3 messages: 2 16K and a 2K message. Note that max_xmit_size should be the same value as FRAG.frag_size (or smaller).
Retransmit requests are always sent to the sender. If the sender dies, and not everyone has received its messages, they will be lost. In the future, this may be changed to have receivers store all messages, so that retransmit requests can be answered by any member. Trivial to implement, but not done yet. For most apps, the default retransmit properties are sufficient, if not use vsync. @author Bela Ban

            merge.setMaxInterval(5000);
        }
        VIEW_SYNC sync=(VIEW_SYNC)stack.findProtocol(VIEW_SYNC.class);
        if(sync != null)
            sync.setAverageSendInterval(5000);
        NAKACK nakack=(NAKACK)stack.findProtocol(NAKACK.class);
        if(nakack != null)
            nakack.setLogDiscardMsgs(false);
    }

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                .addProtocol(new MERGE2())
                .addProtocol(new FD_SOCK())
                .addProtocol(new FD_ALL().setValue("timeout", 12000).setValue("interval", 3000))
                .addProtocol(new VERIFY_SUSPECT())
                .addProtocol(new BARRIER())
                .addProtocol(new NAKACK())
                .addProtocol(new UNICAST2())
                .addProtocol(new STABLE())
                .addProtocol(new GMS())
                .addProtocol(new UFC())
                .addProtocol(new MFC())

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        }
    }


    private static void printDigests(JChannel[] channels) {
        for(JChannel ch: channels) {
            NAKACK nak=(NAKACK)ch.getProtocolStack().findProtocol(NAKACK.class);
            Digest digest=nak.getDigest();
            System.out.println(ch.getName() + ": " + digest.toStringSorted());
        }
    }

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                .addProtocol(new MERGE2())
                .addProtocol(new FD_SOCK())
                .addProtocol(new FD_ALL().setValue("timeout", 12000).setValue("interval", 3000))
                .addProtocol(new VERIFY_SUSPECT())
                .addProtocol(new BARRIER())
                .addProtocol(new NAKACK())
                .addProtocol(new UNICAST2())
                .addProtocol(new STABLE())
                .addProtocol(new GMS())
                .addProtocol(new UFC())
                .addProtocol(new MFC())

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    protected void setUp() throws Exception {
        super.setUp();
        a=new IpAddress(5000); 
        b=new IpAddress(6000);
        c=new IpAddress(7000);
        nak=new NAKACK();
        d1=new MutableDigest(2);
        d1.add(a, 0, 10, 10);
        d1.add(b, 0, 30, 30);


        d2=new MutableDigest(3);

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        View v=new View(a1, 1, members);
        s=new Simulator();
        s.setLocalAddress(a1);
        s.setView(v);
        s.addMember(a1);
        NAKACK nak=new NAKACK();
        interceptor = new MessageInterceptor();
        Protocol[] stack=new Protocol[]{nak, interceptor};
        s.setProtocolStack(stack);
        s.start();
    }

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