Initial implementation of Meter Service (needs testing)

Change-Id: Ie07bd3e2bd7c67a6499c965d8926eb361ad16462

store impl started

Change-Id: Ib8b474f40dcecff335a421c12ad149fe9830c427

full implementation

Change-Id: Ie59fd61d02972bd04d887bdcca9745793b880681
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/meter/MeterState.java b/incubator/api/src/main/java/org/onosproject/incubator/net/meter/MeterState.java
new file mode 100644
index 0000000..a910d6d
--- /dev/null
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/meter/MeterState.java
@@ -0,0 +1,43 @@
+/*
+ * 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;
+
+/**
+ * Represents the state of the meter as seen by the store.
+ */
+public enum MeterState {
+
+    /**
+     * The meter is in the process of being added.
+     */
+    PENDING_ADD,
+
+    /**
+     * THe meter has been added.
+     */
+    ADDED,
+
+    /**
+     * The meter is in the process of being removed.
+     */
+    PENDING_REMOVE,
+
+    /**
+     * The meter has been removed.
+     */
+    REMOVED,
+
+}