[ONOS-3851] Add skeletal code of Web GUI for Control Plane Manager

Change-Id: I0df9c55daec0b6d9a630aa954808e6c310ba861c
diff --git a/apps/cpman/app/src/main/java/org/onosproject/cpman/gui/CpmanViewMessageHandler.java b/apps/cpman/app/src/main/java/org/onosproject/cpman/gui/CpmanViewMessageHandler.java
new file mode 100644
index 0000000..7b7e4d9
--- /dev/null
+++ b/apps/cpman/app/src/main/java/org/onosproject/cpman/gui/CpmanViewMessageHandler.java
@@ -0,0 +1,59 @@
+/*
+ * 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.cpman.gui;
+
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.ImmutableSet;
+import org.onosproject.ui.RequestHandler;
+import org.onosproject.ui.UiMessageHandler;
+
+import java.util.Collection;
+import java.util.Random;
+
+/**
+ * CpmanViewMessageHandler class implementation.
+ */
+public class CpmanViewMessageHandler extends UiMessageHandler {
+
+    private static final String CPMAN_DATA_REQ = "cpmanDataRequest";
+    private static final String CPMAN_DATA_RESP = "cpmanDataResponse";
+
+    private static final String RANDOM = "random";
+
+    @Override
+    protected Collection<RequestHandler> createRequestHandlers() {
+        return ImmutableSet.of(
+                new CpmanDataRequestHandler()
+        );
+    }
+
+    // handler for sample data requests
+    private final class CpmanDataRequestHandler extends RequestHandler {
+
+        private CpmanDataRequestHandler() {
+            super(CPMAN_DATA_REQ);
+        }
+
+        @Override
+        public void process(long sid, ObjectNode payload) {
+            ObjectNode result = objectNode();
+            Random random = new Random();
+            result.put(RANDOM, random.nextInt(50) + 1);
+
+            sendMessage(CPMAN_DATA_RESP, 0, result);
+        }
+    }
+}