GUI -- Major re-write of server-side Topology View code. WIP.
Change-Id: I332e8e59dc2271d3897c3a5c2fafa775324ef72d
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/topo/TopoUiModelService.java b/web/gui/src/main/java/org/onosproject/ui/impl/topo/TopoUiModelService.java
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+/*
+ * Copyright 2015 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;
+
+import com.fasterxml.jackson.databind.node.ObjectNode;
+
+import java.util.List;
+
+/**t
+ * Defines the API for the Topology UI Model.
+ */
+public interface TopoUiModelService {
+
+ /**
+ * Registers the specified listener for Topology UI Model events.
+ *
+ * @param listener the listener
+ */
+ void addListener(TopoUiListener listener);
+
+ /**
+ * Unregister the specified listener.
+ *
+ * @param listener the listener
+ */
+ void removeListener(TopoUiListener listener);
+
+
+ /**
+ * Returns events describing the current state of the model.
+ * <p>
+ * These will be in the form of "addInstance", "addDevice", "addLink",
+ * and "addHost" events, as appropriate.
+ *
+ * @return initial state events
+ */
+ List<ObjectNode> getInitialState();
+
+}