Examples of org.jgroups.protocols.FD$Monitor

org.jgroups.protocols.FD
Failure detection based on simple heartbeat protocol. Regularly polls members for liveness. Multicasts SUSPECT messages when a member is not reachable. The simple algorithms works as follows: the membership is known and ordered. Each HB protocol periodically sends an 'are-you-alive' message to its *neighbor*. A neighbor is the next in rank in the membership list, which is recomputed upon a view change. When a response hasn't been received for n milliseconds and m tries, the corresponding member is suspected (and eventually excluded if faulty).
FD starts when it detects (in a view change notification) that there are at least 2 members in the group. It stops running when the membership drops below 2.
When a message is received from the monitored neighbor member, it causes the pinger thread to 'skip' sending the next are-you-alive message. Thus, traffic is reduced. @author Bela Ban

        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);
        }
        FD_ALL fd_all=(FD_ALL)stack.findProtocol(FD_ALL.class);
        if(fd_all != null) {
            fd_all.setTimeout(2000);
            fd_all.setInterval(600);

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        }
    }


    private static void changeProps(JChannel ... channels) {
        for(JChannel ch: channels) {
            FD fd=(FD)ch.getProtocolStack().findProtocol(FD.class);
            if(fd != null) {
                fd.setTimeout(1000);
                fd.setMaxTries(2);
            }
            FD_ALL fd_all=(FD_ALL)ch.getProtocolStack().findProtocol(FD_ALL.class);
            if(fd_all != null) {
                fd_all.setTimeout(2000);
                fd_all.setInterval(800);

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    }


    private static void modiftFDAndMergeSettings(JChannel ch) {
        ProtocolStack stack=ch.getProtocolStack();


        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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        try {
            ch.getProtocolStack().removeProtocol("VERIFY_SUSPECT");
        } catch (Exception e) {           
            e.printStackTrace();
        }
        FD fd=(FD)stack.findProtocol("FD");
        if(fd != null) {    
            fd.setMaxTries(3);
            fd.setTimeout(1000);
        }       
    }

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