ONOS-6259: Topo2 - Implement server-side highlighting model

- (Still WIP)
- Cleaned up createHandlersAndOverlays() in UiWebSocket.
- Augmented handlerCrossConnects to link Topo2MH to Topo2TrafficMH.
- Topo2Stop event now shuts down background traffic monitoring.

Change-Id: I87e7151ea813b7514521201ecffcf2c9eed22cd7

web/gui/src/main/java/org/onosproject/ui/impl/UiWebSocket.java

@@ -25,6 +25,7 @@ import org.onosproject.cluster.ClusterService;
 import org.onosproject.cluster.ControllerNode;
 import org.onosproject.ui.GlyphConstants;
 import org.onosproject.ui.UiConnection;
+import org.onosproject.ui.UiExtension;
 import org.onosproject.ui.UiExtensionService;
 import org.onosproject.ui.UiMessageHandler;
 import org.onosproject.ui.UiMessageHandlerFactory;
@@ -33,6 +34,7 @@ import org.onosproject.ui.UiTopoLayoutService;
 import org.onosproject.ui.UiTopoOverlayFactory;
 import org.onosproject.ui.impl.topo.Topo2Jsonifier;
 import org.onosproject.ui.impl.topo.Topo2OverlayCache;
+import org.onosproject.ui.impl.topo.Topo2TrafficMessageHandler;
 import org.onosproject.ui.impl.topo.Topo2ViewMessageHandler;
 import org.onosproject.ui.impl.topo.UiTopoSession;
 import org.onosproject.ui.impl.topo.model.UiSharedTopologyModel;
@@ -249,6 +251,8 @@ public class UiWebSocket
         overlayCache = new TopoOverlayCache();
         overlay2Cache = new Topo2OverlayCache();
 
+        Map<Class<?>, UiMessageHandler> handlerInstances = new HashMap<>();
+
         UiExtensionService service = directory.get(UiExtensionService.class);
         service.getExtensions().forEach(ext -> {
             UiMessageHandlerFactory factory = ext.messageHandlerFactory();
@@ -257,21 +261,23 @@ public class UiWebSocket
                     try {
                         handler.init(this, directory);
                         handler.messageTypes().forEach(type -> handlers.put(type, handler));
+                        handlerInstances.put(handler.getClass(), handler);
 
-                        // need to inject the overlay cache into topology message handler
-                        if (handler instanceof TopologyViewMessageHandler) {
-                            ((TopologyViewMessageHandler) handler).setOverlayCache(overlayCache);
-                        }
-
-                        if (handler instanceof Topo2ViewMessageHandler) {
-                            ((Topo2ViewMessageHandler) handler).setOverlayCache(overlay2Cache);
-                        }
                     } catch (Exception e) {
                         log.warn("Unable to setup handler {} due to", handler, e);
                     }
                 });
             }
 
+            registerOverlays(ext);
+        });
+
+        handlerCrossConnects(handlerInstances);
+
+        log.debug("#handlers = {}, #overlays = {}", handlers.size(), overlayCache.size());
+    }
+
+    private void registerOverlays(UiExtension ext) {
         UiTopoOverlayFactory overlayFactory = ext.topoOverlayFactory();
         if (overlayFactory != null) {
             overlayFactory.newOverlays().forEach(overlayCache::add);
@@ -281,9 +287,29 @@ public class UiWebSocket
         if (overlay2Factory != null) {
             overlay2Factory.newOverlays().forEach(overlay2Cache::add);
         }
-        });
-        log.debug("#handlers = {}, #overlays = {}", handlers.size(),
-                  overlayCache.size());
+    }
+
+    private void handlerCrossConnects(Map<Class<?>, UiMessageHandler> handlers) {
+        TopologyViewMessageHandler topomh = (TopologyViewMessageHandler)
+                handlers.get(TopologyViewMessageHandler.class);
+        if (topomh != null) {
+            topomh.setOverlayCache(overlayCache);
+        }
+
+        Topo2ViewMessageHandler topo2mh = (Topo2ViewMessageHandler)
+                handlers.get(Topo2ViewMessageHandler.class);
+        if (topo2mh != null) {
+            topo2mh.setOverlayCache(overlay2Cache);
+
+            // We also need a link to Topo2Traffic
+            Topo2TrafficMessageHandler topo2traffic = (Topo2TrafficMessageHandler)
+                    handlers.get(Topo2TrafficMessageHandler.class);
+            if (topo2traffic != null) {
+                topo2mh.setTrafficHandler(topo2traffic);
+            } else {
+                log.error("No topo2 traffic handler found");
+            }
+        }
     }
 
     // Destroys message handlers.
@@ -325,4 +351,3 @@ public class UiWebSocket
     }
 
 }
-

web/gui/src/main/java/org/onosproject/ui/impl/topo/Topo2TrafficMessageHandler.java

@@ -85,6 +85,13 @@ public class Topo2TrafficMessageHandler extends UiMessageHandler {
         );
     }
 
+    /**
+     * Shuts down the background traffic monitoring task.
+     */
+    void ceaseAndDesist() {
+        traffic.stopMonitoring();
+    }
+
     // ==================================================================
 
     private final class Topo2AllTraffic extends RequestHandler {

web/gui/src/main/java/org/onosproject/ui/impl/topo/Topo2ViewMessageHandler.java

@@ -72,6 +72,7 @@ public class Topo2ViewMessageHandler extends UiMessageHandler {
     private UiTopoSession topoSession;
     private Topo2Jsonifier t2json;
     private Topo2OverlayCache overlay2Cache;
+    private Topo2TrafficMessageHandler trafficHandler;
 
 
     @Override
@@ -93,6 +94,15 @@ public class Topo2ViewMessageHandler extends UiMessageHandler {
         this.overlay2Cache = overlay2Cache;
     }
 
+    /**
+     * Sets a reference to the traffic message handler.
+     *
+     * @param traffic the traffic message handler instance
+     */
+    public void setTrafficHandler(Topo2TrafficMessageHandler traffic) {
+        trafficHandler = traffic;
+    }
+
 
     @Override
     protected Collection<RequestHandler> createRequestHandlers() {
@@ -202,12 +212,10 @@ public class Topo2ViewMessageHandler extends UiMessageHandler {
             // client view has gone away; so shut down server-side processing
 
             log.debug("topo2Stop: {}", payload);
-            // TODO: tell traffic monitor to stop monitoring...
-            //       this requires this handler to know about traffic handler!!
+            trafficHandler.ceaseAndDesist();
 
             // OLD CODE DID THE FOLLOWING...
 //            stopSummaryMonitoring();
-//            traffic.stopMonitoring();
         }
     }