[ONOS-3537] Initial implementation of ControlMessageManager

- Add skeletal code of ControlMessageStore
- Add initial implementation of ControlMessageManager

Change-Id: I17161ce18b67e8f35ea9b80832f3732a55de323b
diff --git a/apps/cpman/app/src/main/java/org/onosproject/cpman/impl/message/DefaultControlMessageStore.java b/apps/cpman/app/src/main/java/org/onosproject/cpman/impl/message/DefaultControlMessageStore.java
new file mode 100644
index 0000000..d4ffc9c
--- /dev/null
+++ b/apps/cpman/app/src/main/java/org/onosproject/cpman/impl/message/DefaultControlMessageStore.java
@@ -0,0 +1,63 @@
+/*
+ * 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.impl.message;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Service;
+import org.onosproject.cpman.ControlMessage;
+import org.onosproject.cpman.message.ControlMessageEvent;
+import org.onosproject.cpman.message.ControlMessageStore;
+import org.onosproject.cpman.message.ControlMessageStoreDelegate;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.provider.ProviderId;
+import org.onosproject.store.AbstractStore;
+import org.slf4j.Logger;
+
+import java.util.Collection;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Manages inventory of control message using trivial in-memory structures
+ * implementation.
+ */
+@Component(immediate = true)
+@Service
+public class DefaultControlMessageStore
+        extends AbstractStore<ControlMessageEvent, ControlMessageStoreDelegate>
+        implements ControlMessageStore {
+
+    private final Logger log = getLogger(getClass());
+
+    @Override
+    public ControlMessageEvent updateStatsInfo(ProviderId providerId, DeviceId deviceId,
+                                                     Collection<ControlMessage> controlMessages) {
+
+        return new ControlMessageEvent(ControlMessageEvent.Type.STATS_UPDATE, controlMessages);
+    }
+
+    @Activate
+    public void activate() {
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        log.info("Stopped");
+    }
+}