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 $


   private boolean needsToRejoin(View v) {
      if (v instanceof MergeView) {
         MergeView mv = (MergeView) v;
         org.jgroups.Address coord = v.getMembers().get(0);
         View winningPartition = null;
         for (View p : mv.getSubgroups()) {
            if (p.getMembers().get(0).equals(coord)) {
               winningPartition = p;
               break;
            }
         }


         if (!winningPartition.containsMember(channel.getAddress())) return true;
      }
      return false;
   }

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   }


   public void testNotifyViewChange()
   {
      assert allEventsListener.viewChanged == null;
      View view = new View();
      notifier.notifyViewChange(view, ctx);
      assert allEventsListener.viewChanged != null;
      assert allEventsListener.viewChanged.getNewView().equals(view);
      assert allEventsListener.viewChanged.getType() == Event.Type.VIEW_CHANGED;
   }

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   private boolean needsToRejoin(View v) {
      if (v instanceof MergeView) {
         MergeView mv = (MergeView) v;
         org.jgroups.Address coord = v.getMembers().get(0);
         View winningPartition = null;
         for (View p: mv.getSubgroups()) {
            if (p.getMembers().get(0).equals(coord)) {
               winningPartition = p;
               break;
            }
         }


         if (!winningPartition.containsMember(channel.getAddress())) return true;
      }
      return false;
   }

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      final List<org.jgroups.Address> viewMembers = new ArrayList<org.jgroups.Address>();
      for (Address a : members)
         if (!a.equals(missing))
            viewMembers.add(getjGroupsAddress((JGroupsAddress) a));
      int viewId = where[0].getTransport().getViewId() + 1;
      View view = View.create(viewMembers.get(0), viewId, (org.jgroups.Address[]) viewMembers.toArray(new org.jgroups.Address[viewMembers.size()]));


      log.trace("Before installing new view:" + viewMembers);
      for (EmbeddedCacheManager ecm : where) {
         Channel c = ((JGroupsTransport) ecm.getTransport()).getChannel();
         ((GMS) c.getProtocolStack().findProtocol(GMS.class)).installView(view);

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            channel.getProtocolStack().insertProtocol(discard, ProtocolStack.ABOVE, TP.class);
         } catch (Exception e) {
            log.warn("Problems inserting discard", e);
            throw new RuntimeException(e);
         }
         View view = View.create(channel.getAddress(), 100);
         ((GMS) channel.getProtocolStack().findProtocol(GMS.class)).installView(view);
      }
      TestingUtil.killCacheManagers(cacheManagers);
   }

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      }


      private List<Address> installNewView() {
         final List<Address> viewMembers = new ArrayList<>();
         for (Channel c : channels) viewMembers.add(c.getAddress());
         View view = View.create(channels.get(0).getAddress(), viewId.incrementAndGet(), (Address[]) viewMembers.toArray(new Address[viewMembers.size()]));


         log.trace("Before installing new view...");
         for (Channel c : channels)
            ((GMS) c.getProtocolStack().findProtocol(GMS.class)).installView(view);
         return viewMembers;

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      private List<Address> installMergeView(ArrayList<Channel> view1, ArrayList<Channel> view2) {
         List<Address> allAddresses = new ArrayList<>();
         for (Channel c: view1) allAddresses.add(c.getAddress());
         for (Channel c: view2) allAddresses.add(c.getAddress());


         View v1 = toView(view1);
         View v2 = toView(view2);
         List<View> allViews = new ArrayList<>();
         allViews.add(v1);
         allViews.add(v2);


//         log.trace("Before installing new view: " + viewMembers);

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   private boolean needsToRejoin(View v) {
      if (v instanceof MergeView) {
         MergeView mv = (MergeView) v;
         org.jgroups.Address coord = v.getMembers().get(0);
         View winningPartition = null;
         for (View p : mv.getSubgroups()) {
            if (p.getMembers().get(0).equals(coord)) {
               winningPartition = p;
               break;
            }
         }


         return winningPartition == null || !winningPartition.containsMember(channel.getAddress());
      }
      return false;
   }

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   private void expectView(JChannel... channels) throws Exception {
      for (int i = 0; i < 20; i++) {
         boolean success = true;
         for (int j = 0; j < channels.length; j++) {
            View view = channels[j].getView();
            if (view == null) {
               success = false;
               break;
            }
            success = success && (view.size() == channels.length);
            if (view.size() > channels.length) assert false : "Clusters see each other!";
         }
         if (success) return;
         Thread.sleep(1000);
      }
      fail("Could not form cluster in given timeout");

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    public void readFrom(DataInput in) throws Exception {
        byte flags=in.readByte();


        // 1. view
        if((flags & VIEW_PRESENT) == VIEW_PRESENT) {
            view=new View();
            view.readFrom(in);
        }


        // 2. digest
        if((flags & DIGEST_PRESENT) == DIGEST_PRESENT) {

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