Adding support for user interface extensions.
Change-Id: I1e41d16efc11be31ad4c2fb0c09e86e3dfd26706
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/GuiWebSocketServlet.java b/web/gui/src/main/java/org/onosproject/ui/impl/GuiWebSocketServlet.java
new file mode 100644
index 0000000..5a660e0
--- /dev/null
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/GuiWebSocketServlet.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2014,2015 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;
+
+import org.eclipse.jetty.websocket.WebSocket;
+import org.eclipse.jetty.websocket.WebSocketServlet;
+import org.onlab.osgi.DefaultServiceDirectory;
+import org.onlab.osgi.ServiceDirectory;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+import java.util.Timer;
+import java.util.TimerTask;
+
+/**
+ * Web socket servlet capable of creating various sockets for the user interface.
+ */
+public class GuiWebSocketServlet extends WebSocketServlet {
+
+ private static final long PING_DELAY_MS = 5000;
+
+ private ServiceDirectory directory = new DefaultServiceDirectory();
+
+ private final Set<TopologyViewWebSocket> sockets = new HashSet<>();
+ private final Timer timer = new Timer();
+ private final TimerTask pruner = new Pruner();
+
+ @Override
+ public void init() throws ServletException {
+ super.init();
+ timer.schedule(pruner, PING_DELAY_MS, PING_DELAY_MS);
+ }
+
+ @Override
+ public WebSocket doWebSocketConnect(HttpServletRequest request, String protocol) {
+ TopologyViewWebSocket socket = new TopologyViewWebSocket(directory);
+ synchronized (sockets) {
+ sockets.add(socket);
+ }
+ return socket;
+ }
+
+ // Task for pruning web-sockets that are idle.
+ private class Pruner extends TimerTask {
+ @Override
+ public void run() {
+ synchronized (sockets) {
+ Iterator<TopologyViewWebSocket> it = sockets.iterator();
+ while (it.hasNext()) {
+ TopologyViewWebSocket socket = it.next();
+ if (socket.isIdle()) {
+ it.remove();
+ socket.close();
+ }
+ }
+ }
+ }
+ }
+}