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
new file mode 100644
index 0000000..d72ff3d
--- /dev/null
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/topo/model/ModelCache.java
@@ -0,0 +1,75 @@
+/*
+ *  Copyright 2016 Open Networking Laboratory
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package org.onosproject.ui.impl.topo.model;
+
+import org.onosproject.event.EventDispatcher;
+import org.onosproject.net.Device;
+import org.onosproject.ui.model.topo.UiDevice;
+
+/**
+ * UI Topology Model cache.
+ */
+class ModelCache {
+
+    private final EventDispatcher dispatcher;
+
+    ModelCache(EventDispatcher eventDispatcher) {
+        this.dispatcher = eventDispatcher;
+    }
+
+    /**
+     * Clear our model.
+     */
+    void clear() {
+        // TODO: clear our internal state
+    }
+
+    /**
+     * Create our internal model of the global topology.
+     */
+    void load() {
+//        loadClusterMembers();
+//        loadRegions();
+//        loadDevices();
+//        loadHosts();
+//        loadLinks();
+    }
+
+
+    // add or update device
+    void addOrUpdateDevice(Device device) {
+        // fetch UiDevice
+        UiDevice uiDevice = new UiDevice();
+
+        dispatcher.post(
+                new UiModelEvent(UiModelEvent.Type.DEVICE_ADDED, uiDevice)
+        );
+
+    }
+
+    void removeDevice(Device device) {
+        UiDevice uiDevice = new UiDevice();
+
+        dispatcher.post(
+                new UiModelEvent(UiModelEvent.Type.DEVICE_REMOVED, uiDevice)
+        );
+
+    }
+
+    // TODO remaining model objects
+
+}