Examples of org.jgroups.View

org.jgroups.View
A view is a local representation of the current membership of a group. Only one view is installed in a channel at a time. Views contain the address of its creator, an ID and a list of member addresses. These adresses are ordered, and the first address is always the coordinator of the view. This way, each member of the group knows who the new coordinator will be if the current one crashes or leaves the group. The views are sent between members using the VIEW_CHANGE event @author Bela Ban @version $Id: View.java,v 1.20 2008/02/20 15:51:57 belaban Exp $

         channel.connect(GROUP);
         
         JChannel third = new JChannel (props);
         third.connect(GROUP);
         
         View view=channel.getView();
         assert channel.getView().size() == 3;
         assert third.getView().size() == 3;
         assert view.containsMember(channel.getAddress());
         assert view.containsMember(coordinator.getAddress());
         
         Util.close(third);
     }

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         channel.disconnect();
         channel.connect(GROUP);


         Thread.sleep(1000);


         View view=channel.getView();
         assert view.size() == 2;
         assert view.containsMember(channel.getAddress());
         assert view.containsMember(coordinator.getAddress());
     }

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        for(Iterator<Address> it=new_mbrs.iterator(); it.hasNext();) {
            Address mbr=it.next();
            if(gms.members.contains(mbr)) { // already joined: return current digest and membership
                if(log.isWarnEnabled())
                    log.warn(mbr + " already present; returning existing view " + gms.view);
                JoinRsp join_rsp=new JoinRsp(new View(gms.view_id, gms.members.getMembers()), gms.getDigest());
                gms.sendJoinResponse(join_rsp, mbr);
                it.remove();
            }
        }


        if(new_mbrs.isEmpty() && leaving_mbrs.isEmpty() && suspected_mbrs.isEmpty()) {
            if(log.isTraceEnabled())
                log.trace("found no members to add or remove, will not create new view");
            return;
        }
        
        View new_view=gms.getNextView(new_mbrs, leaving_mbrs, suspected_mbrs);


        if(new_view.size() == 0 && gms.local_addr != null && gms.local_addr.equals(new_view.getCreator())) {
            if(log.isTraceEnabled())
                log.trace("view " + new_view + " is empty: will not multicast it (last view)");
            if(leaving) {
                gms.initState(); // in case connect() is called again
            }

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        barrier.await(); // causes all threads to call Channel.connect()
        System.out.println("*** Starting the connect phase ***");


        long target_time=System.currentTimeMillis() + 60000L;
        while(System.currentTimeMillis() < target_time) {
            View view=threads[0].getChannel().getView();
            if(view != null) {
                int size=view.size();
                System.out.println("channel[0].view has " + size + " members (expected: " + NUM + ")");
                if(size >= NUM)
                    break;
            }
            Util.sleep(1000L);
        }


        for(MyThread thread: threads) {
            View view=thread.getChannel().getView();
            if(view != null)
                System.out.println(thread.getName() + ": size=" + view.size() + ", view-id: " + view.getViewId());
        }


        for(MyThread thread: threads) {
            View view=thread.getChannel().getView();
            int size=view.size();
            assert size == NUM : "view doesn't have size of " + NUM + " (has " + size + "): " + view;
        }




        System.out.println("*** Starting the disconnect phase ***");

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        coordinator = new JChannel(props);
        channel = new JChannel(props);
        modifyChannel(channel,coordinator);
        coordinator.connect("testConnectTwoChannels");
        channel.connect("testConnectTwoChannels");
        View view = channel.getView();
        assert view.size() == 2;
        assert view.containsMember(channel.getLocalAddress());
        assert view.containsMember(coordinator.getLocalAddress());


        channel.disconnect();
        Util.sleep(1000);
        view = coordinator.getView();
        assert view.size() == 1;
        assert view.containsMember(coordinator.getLocalAddress());
    }

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        gr1.start();
        gr2.start();


        // give time to reconnect
        Util.sleep(3000);
        View view = coordinator.getView();
        assert view.size() == 2;
        assert view.containsMember(coordinator.getLocalAddress());
        assert view.containsMember(channel.getLocalAddress());


        view = channel.getView();
        assert view.size() == 2;
        assert view.containsMember(coordinator.getLocalAddress());
        assert view.containsMember(channel.getLocalAddress());
    }

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        third = new JChannel(props);
        modifyChannel(third);
        third.connect("testConnectThreeChannelsWithGRDown");
        Util.sleep(1000);
        View view = channel.getView();
        assert channel.getView().size() == 3;
        assert third.getView().size() == 3;
        assert view.containsMember(channel.getLocalAddress());
        assert view.containsMember(coordinator.getLocalAddress());


        // kill router and recheck views
        gr2.stop();
        Util.sleep(1000);

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        Util.sleep(1000);
        gr2.stop();


        channel.send(new Message(null, null, "payload"));


        View view = coordinator.getView();
        assert view.size() == 2;
        assert view.containsMember(coordinator.getLocalAddress());
        assert view.containsMember(channel.getLocalAddress());


        view = channel.getView();
        assert view.size() == 2;
        assert view.containsMember(coordinator.getLocalAddress());
        assert view.containsMember(channel.getLocalAddress());


        Message msg = msgPromise.getResult(20000);
        assert msg != null;
        assert "payload".equals(msg.getObject());

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        channel.send(new Message(null, null, "payload"));


        View view = coordinator.getView();
        assert view.size() == 2;
        assert view.containsMember(coordinator.getLocalAddress());
        assert view.containsMember(channel.getLocalAddress());


        view = channel.getView();
        assert view.size() == 2;
        assert view.containsMember(coordinator.getLocalAddress());
        assert view.containsMember(channel.getLocalAddress());


        Message msg = msgPromise.getResult(20000);
        assert msg != null;
        assert "payload".equals(msg.getObject());
    }

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        Util.sleep(6000);
       


        channel.send(new Message(null, null, "payload"));


        View view = coordinator.getView();
        assert view.size() == 2;
        assert view.containsMember(coordinator.getLocalAddress());
        assert view.containsMember(channel.getLocalAddress());


        view = channel.getView();
        assert view.size() == 2;
        assert view.containsMember(coordinator.getLocalAddress());
        assert view.containsMember(channel.getLocalAddress());


        Message msg = msgPromise.getResult(20000);
        assert msg != null;
        assert "payload".equals(msg.getObject());
    }

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