1 files changed, 149 insertions, 0 deletions
diff --git a/framework/src/onos/utils/stc/src/main/java/org/onlab/stc/MonitorWebSocket.java b/framework/src/onos/utils/stc/src/main/java/org/onlab/stc/MonitorWebSocket.java
new file mode 100644
index 00000000..cd146070
--- /dev/null
+++ b/framework/src/onos/utils/stc/src/main/java/org/onlab/stc/MonitorWebSocket.java
@@ -0,0 +1,149 @@
+/*
+ * 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.onlab.stc;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.eclipse.jetty.websocket.WebSocket;
+
+import java.io.IOException;
+
+import static org.onlab.stc.Coordinator.print;
+
+/**
+ * Web socket capable of interacting with the STC monitor GUI.
+ */
+public class MonitorWebSocket implements WebSocket.OnTextMessage, WebSocket.OnControl {
+
+    private static final long MAX_AGE_MS = 30_000;
+
+    private static final byte PING = 0x9;
+    private static final byte PONG = 0xA;
+    private static final byte[] PING_DATA = new byte[]{(byte) 0xde, (byte) 0xad};
+
+    private final Monitor monitor;
+
+    private Connection connection;
+    private FrameConnection control;
+
+    private final ObjectMapper mapper = new ObjectMapper();
+
+    private long lastActive = System.currentTimeMillis();
+
+    /**
+     * Creates a new monitor client GUI web-socket.
+     *
+     * @param monitor shared process flow monitor
+     */
+    MonitorWebSocket(Monitor monitor) {
+        this.monitor = monitor;
+    }
+
+    /**
+     * Issues a close on the connection.
+     */
+    synchronized void close() {
+        destroyHandlers();
+        if (connection.isOpen()) {
+            connection.close();
+        }
+    }
+
+    /**
+     * Indicates if this connection is idle.
+     *
+     * @return true if idle or closed
+     */
+    synchronized boolean isIdle() {
+        long quietFor = System.currentTimeMillis() - lastActive;
+        boolean idle = quietFor > MAX_AGE_MS;
+        if (idle || (connection != null && !connection.isOpen())) {
+            return true;
+        } else if (connection != null) {
+            try {
+                control.sendControl(PING, PING_DATA, 0, PING_DATA.length);
+            } catch (IOException e) {
+                print("Unable to send ping message due to: %s", e);
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public void onOpen(Connection connection) {
+        this.connection = connection;
+        this.control = (FrameConnection) connection;
+        try {
+            createHandlers();
+            sendMessage(message("flow", monitor.scenarioData()));
+
+        } catch (Exception e) {
+            print("Unable to open monitor connection: %s", e);
+            this.connection.close();
+            this.connection = null;
+            this.control = null;
+        }
+    }
+
+    @Override
+    public synchronized void onClose(int closeCode, String message) {
+        destroyHandlers();
+    }
+
+    @Override
+    public boolean onControl(byte controlCode, byte[] data, int offset, int length) {
+        lastActive = System.currentTimeMillis();
+        return true;
+    }
+
+    @Override
+    public void onMessage(String data) {
+        lastActive = System.currentTimeMillis();
+        try {
+            ObjectNode message = (ObjectNode) mapper.reader().readTree(data);
+            // TODO:
+            print("Got message: %s", message);
+        } catch (Exception e) {
+            print("Unable to parse GUI message %s due to %s", data, e);
+        }
+    }
+
+    public synchronized void sendMessage(ObjectNode message) {
+        try {
+            if (connection.isOpen()) {
+                connection.sendMessage(message.toString());
+            }
+        } catch (IOException e) {
+            print("Unable to send message %s to GUI due to %s", message, e);
+        }
+    }
+
+    public ObjectNode message(String type, ObjectNode payload) {
+        ObjectNode message = mapper.createObjectNode().put("event", type);
+        message.set("payload", payload);
+        return message;
+    }
+
+    // Creates new message handlers.
+    private synchronized void createHandlers() {
+    }
+
+    // Destroys message handlers.
+    private synchronized void destroyHandlers() {
+    }
+
+}
+