Examples of org.jgroups.protocols.MERGE2

org.jgroups.protocols.MERGE2
Protocol to discover subgroups; e.g., existing due to a network partition (that healed). Example: group {p,q,r,s,t,u,v,w} is split into 3 subgroups {p,q}, {r,s,t,u} and {v,w}. This protocol will eventually send a MERGE event with the coordinators of each subgroup up the stack: {p,r,v}. Note that - depending on the time of subgroup discovery - there could also be 2 MERGE events, which first join 2 of the subgroups, and then the resulting group to the last subgroup. The real work of merging the subgroups into one larger group is done somewhere above this protocol (typically in the GMS protocol).
This protocol works as follows:
- If coordinator: periodically retrieve the initial membership (using the FIND_INITIAL_MBRS event provided e.g. by PING or TCPPING protocols. This list contains {coord,addr} pairs.
- If there is more than 1 coordinator:
  1. Get all coordinators
  2. Create a MERGE event with the list of coordinators as argument
  3. Send the event up the stack
Requires: FIND_INITIAL_MBRS event from below
Provides: sends MERGE event with list of coordinators up the stack
@author Bela Ban, Oct 16 2001

        assert "payload".equals(msg.getObject());
    }


    private static void setProps(JChannel channel) {
        ProtocolStack stack=channel.getProtocolStack();
        MERGE2 merge=(MERGE2)stack.findProtocol(MERGE2.class);
        if(merge != null) {
            merge.setMinInterval(1000);
            merge.setMaxInterval(3000);
        }
        FD fd=(FD)stack.findProtocol(FD.class);
        if(fd != null) {
            fd.setTimeout(1000);
            fd.setMaxTries(2);

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        }
    }


    private static void changeMergeInterval(JChannel channel) {
        ProtocolStack stack=channel.getProtocolStack();
        MERGE2 merge=(MERGE2)stack.findProtocol(MERGE2.class);
        if(merge != null) {
            merge.setMinInterval(5000);
            merge.setMaxInterval(10000);
        }
    }

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        assert view.size() == 2 : "view=" + view;
        Util.close(c2, c1);
    }


    private static void changeMergeInterval(JChannel c1) {
        MERGE2 merge=(MERGE2)c1.getProtocolStack().findProtocol(MERGE2.class);
        if(merge != null) {
            merge.setMinInterval(1000);
            merge.setMaxInterval(3000);
        }
    }

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        if(gms != null) {
            gms.setViewBundling(true);
            gms.setMaxBundlingTime(300);
            gms.setPrintLocalAddr(false);
        }
        MERGE2 merge=(MERGE2)stack.findProtocol("MERGE2");
        if(merge != null) {
            merge.setMinInterval(2000);
            merge.setMaxInterval(5000);
        }
        NAKACK nakack=(NAKACK)stack.findProtocol(NAKACK.class);
        if(nakack != null)
            nakack.setLogDiscardMsgs(false);
    }

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    private static void modifyStack(JChannel ch) {
        ProtocolStack stack=ch.getProtocolStack();
        Protocol prot=stack.findProtocol(MERGE2.class);
        if(prot != null) {
            MERGE2 merge=(MERGE2)prot;
            merge.setMinInterval(3000);
            merge.setMaxInterval(5000);
        }
        prot=stack.findProtocol(STABLE.class);
        if(prot != null) {
            STABLE stable=(STABLE)prot;
            stable.setDesiredAverageGossip(5000);

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    ProtocolStack stack = new ProtocolStack();
    channel.setProtocolStack(stack);
    
    stack.addProtocols(new UDP().setValue("bind_addr", InetAddress.getByName(BIND_ADDR)))
        .addProtocol(new PING())
        .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())

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    ProtocolStack stack = new ProtocolStack();
    channel.setProtocolStack(stack);
    
    stack.addProtocols(new UDP().setValue("bind_addr", InetAddress.getByName("192.168.1.108")))
        .addProtocol(new PING())
        .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())

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        FD fd=(FD)stack.findProtocol("FD");
        if(fd != null) {
            fd.setMaxTries(3);
            fd.setTimeout(1000);
        }
        MERGE2 merge=(MERGE2)stack.findProtocol("MERGE2");
        if(merge != null) {
            merge.setMinInterval(5000);
            merge.setMaxInterval(10000);
        }      
    }

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        if(gms != null) {
            gms.setViewBundling(true);
            gms.setMaxBundlingTime(300);
            gms.setPrintLocalAddr(false);
        }
        MERGE2 merge=(MERGE2)stack.findProtocol("MERGE2");
        if(merge != null) {
            merge.setMinInterval(2000);
            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);

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        c2.close();
        c1.close();
    }


    private static void changeMergeInterval(JChannel c1) {
        MERGE2 merge=(MERGE2)c1.getProtocolStack().findProtocol(MERGE2.class);
        if(merge != null) {
            merge.setMinInterval(1000);
            merge.setMaxInterval(3000);
        }
    }

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