Examples of org.jgroups.protocols.pbcast.GMS

org.jgroups.protocols.pbcast.GMS
Group membership protocol. Handles joins/leaves/crashes (suspicions) and emits new views accordingly. Use VIEW_ENFORCER on top of this layer to make sure new members don't receive any messages until they are members @author Bela Ban

         channel.connect(GROUP);


         System.out.println("shutting down the participant channel");
         Util.shutdown(channel);


         GMS coord_gms=(GMS)coordinator.getProtocolStack().findProtocol(GMS.class);
         if(coord_gms != null)
             coord_gms.setLevel("trace");


         View view;
         long end_time=System.currentTimeMillis() + 10000;
         while(System.currentTimeMillis() < end_time) {
             view=coordinator.getView();
             if(view.size() == 1)
                 break;
             Util.sleep(500);
         }
         view=coordinator.getView();
         assert view.size() == 1 : "coordinator's view is " + view + ", but we expected a view of 1 member";
         if(coord_gms != null)
             coord_gms.setLevel("warn");
     }

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    /** Injects SUSPECT event(suspected_mbr) into channels */
    private static void injectSuspectEvent(Address suspected_mbr, JChannel ... channels) {
        Event evt=new Event(Event.SUSPECT, suspected_mbr);
        for(JChannel ch: channels) {
            GMS gms=(GMS)ch.getProtocolStack().findProtocol(GMS.class);
            if(gms != null)
                gms.up(evt);
        }
    }

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        checkReceivedMessages(make(ra, 15), make(rb,15), make(rc,15));
    }




    private static void makeCoordinator(JChannel ch) {
        GMS gms=(GMS)ch.getProtocolStack().findProtocol(GMS.class);
        gms.becomeCoordinator();
    }

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        return null;
    }


    private static void injectView(View view, JChannel ... channels) {
        for(JChannel ch: channels) {
            GMS gms=(GMS)ch.getProtocolStack().findProtocol(GMS.class);
            gms.installView(view);
        }
        for(JChannel ch: channels) {
            MyReceiver receiver=(MyReceiver)ch.getReceiver();
            System.out.println("[" + receiver.name + "] view=" + ch.getView());
        }

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    }




    private static void injectMergeEvent(Event evt, JChannel ... channels) {
        for(JChannel ch: channels) {
            GMS gms=(GMS)ch.getProtocolStack().findProtocol(GMS.class);
            gms.up(evt);
        }
    }

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    }




    private static void changeViewBundling(JChannel channel) {
        ProtocolStack stack=channel.getProtocolStack();
        GMS gms=(GMS)stack.findProtocol(GMS.class);
        if(gms != null) {
            gms.setViewBundling(true);
            gms.setMaxBundlingTime(500);
        }
    }

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            ViewId new_vid = new ViewId(ch.getAddress(), vid.getId() + 1);
            View new_view = new View(new_vid, members);


            // inject view in which the shut down member is the only element
            GMS gms = (GMS) stack.findProtocol(GMS.class);
            gms.installView(new_view);
        }
        Util.close(ch);
    }

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          .addProtocol(new VERIFY_SUSPECT())
          .addProtocol(new BARRIER())
          .addProtocol(new NAKACK().setValue("use_mcast_xmit", false).setValue("discard_delivered_msgs", true))
          .addProtocol(new UNICAST2().setValue("stable_interval", 10000).setValue("max_bytes", 50000))
          .addProtocol(new STABLE().setValue("max_bytes", 50000))
          .addProtocol(new GMS().setValue("print_local_addr", false))
          .addProtocol(new UFC().setValue("max_credits", 2000000))
          .addProtocol(new MFC().setValue("max_credits", 2000000))
          .addProtocol(new FRAG2());
        stack.init();
        return ch;

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            transport.setMaxBundleSize(max_bytes);
            transport.setMaxBundleTimeout(timeout);
        }
        transport.setEnableUnicastBundling(false);
        if(enabled) {
            GMS gms=(GMS)stack.findProtocol("GMS");
            gms.setViewAckCollectionTimeout(LATENCY * 2);
            gms.setJoinTimeout(LATENCY * 2);
        }
    }

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            Address coord=findAddress(tmp, channels);
            views.put(coord, findView(tmp, channels));
        }


        JChannel coord=findChannel(leader_addr, channels);
        GMS gms=(GMS)coord.getProtocolStack().findProtocol(GMS.class);
        gms.setLevel("trace");
        gms.up(new Event(Event.MERGE, views));
    }

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