moving meter service to incubator and initial implementation of
meter manager.

Change-Id: I6ef0d9476b58d00b37f7ef156ac7bdacca20185b
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/meter/MeterEvent.java b/incubator/api/src/main/java/org/onosproject/incubator/net/meter/MeterEvent.java
new file mode 100644
index 0000000..a952a14
--- /dev/null
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/meter/MeterEvent.java
@@ -0,0 +1,82 @@
+/*
+ * 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.onosproject.incubator.net.meter;
+
+import org.onosproject.event.AbstractEvent;
+
+/**
+ * Entity that represents Meter events.
+ */
+public class MeterEvent extends AbstractEvent<MeterEvent.Type, Meter> {
+
+
+    enum Type {
+
+        /**
+         * Signals that a new meter has been added.
+         */
+        METER_ADDED,
+
+        /**
+         * Signals that a meter has been removed.
+         */
+        METER_REMOVED,
+
+        /**
+         * Signals that a meter has been added.
+         */
+        METER_UPDATED,
+
+        /**
+         * Signals that a meter addition failed.
+         */
+        METER_ADD_FAILED,
+
+        /**
+         * Signals that a meter removal failed.
+         */
+        METER_REMOVE_FAILED,
+
+        /**
+         * Signals that a meter update failed.
+         */
+        METER_UPDATE_FAILED
+    }
+
+
+    /**
+     * Creates an event of a given type and for the specified meter and the
+     * current time.
+     *
+     * @param type  meter event type
+     * @param meter event subject
+     */
+    public MeterEvent(Type type, Meter meter) {
+        super(type, meter);
+    }
+
+    /**
+     * Creates an event of a given type and for the specified meter and time.
+     *
+     * @param type  meter event type
+     * @param meter event subject
+     * @param time  occurrence time
+     */
+    public MeterEvent(Type type, Meter meter, long time) {
+        super(type, meter, time);
+    }
+
+}