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Change-Id: I0425764b2f3b07bc224a387ab7d544c6b360c691
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/topo/UiTopoSession.java b/web/gui/src/main/java/org/onosproject/ui/impl/topo/UiTopoSession.java
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+/*
+ * 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;
+
+import org.onosproject.ui.UiTopoLayoutService;
+import org.onosproject.ui.impl.UiWebSocket;
+import org.onosproject.ui.impl.topo.model.UiSharedTopologyModel;
+import org.onosproject.ui.model.topo.UiTopoLayout;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Coordinates with the {@link UiTopoLayoutService} to access
+ * {@link UiTopoLayout}s, and with the {@link UiSharedTopologyModel} which
+ * maintains a local model of the network entities,
+ * tailored specifically for displaying on the UI.
+ * <p>
+ * Note that an instance of this class will be created for each
+ * {@link UiWebSocket} connection, and will contain
+ * the state of how the topology is laid out for the logged-in user.
+ */
+public class UiTopoSession {
+ private final Logger log = LoggerFactory.getLogger(getClass());
+
+ private final String username;
+ private final UiWebSocket webSocket;
+ private final UiSharedTopologyModel sharedModel;
+
+ private boolean registered = false;
+
+ private UiTopoLayoutService service;
+ private UiTopoLayout layout;
+
+ /**
+ * Creates a new topology layout.
+ */
+ public UiTopoSession(String username, UiWebSocket webSocket) {
+ this.username = username;
+ this.webSocket = webSocket;
+ this.sharedModel = UiSharedTopologyModel.instance();
+ }
+
+ /**
+ * Initializes the layout; registering with the shared model.
+ */
+ public void init() {
+ if (!registered) {
+ sharedModel.register(this);
+ registered = true;
+ } else {
+ log.warn("already registered");
+ }
+ }
+
+ /**
+ * Destroys the layout; unregistering from the shared model.
+ */
+ public void destroy() {
+ if (!registered) {
+ sharedModel.unregister(this);
+ registered = false;
+ } else {
+ log.warn("already unregistered");
+ }
+ }
+
+ @Override
+ public String toString() {
+ return String.format("{UiTopoSession for user <%s>}", username);
+ }
+}