ONOS-4971: Synthetic Link Data -- WIP

- adding CLI commands for dumping Model Cache contents.

Change-Id: I28dfe179835de6cd0c5356faf87af46a239eb772
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/topo/model/ModelCache.java b/web/gui/src/main/java/org/onosproject/ui/impl/topo/model/ModelCache.java
index e3fedd1..4ca6b42 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/topo/model/ModelCache.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/topo/model/ModelCache.java
@@ -298,6 +298,10 @@
         }
     }
 
+    Set<UiDevice> getAllDevices() {
+        return uiTopology.allDevices();
+    }
+
 
     // === LINKS
 
@@ -357,6 +361,9 @@
         }
     }
 
+    Set<UiLink> getAllLinks() {
+        return uiTopology.allLinks();
+    }
 
     // === HOSTS
 
@@ -460,6 +467,10 @@
         }
     }
 
+    Set<UiHost> getAllHosts() {
+        return uiTopology.allHosts();
+    }
+
 
     /**
      * Refreshes the internal state.