[ONOS-5501] Defining VirtualMeterProvider Interface

Changes
1. added virtual meter provider and supporting ineterfaces.

Change-Id: I9ce7e78fec61b32798303c54a09b680bbe528b70
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/provider/VirtualMeterProvider.java b/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/provider/VirtualMeterProvider.java
new file mode 100644
index 0000000..f1085c3
--- /dev/null
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/provider/VirtualMeterProvider.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2016-present 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.virtual.provider;
+
+import org.onosproject.incubator.net.virtual.NetworkId;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.meter.MeterOperation;
+import org.onosproject.net.meter.MeterOperations;
+
+/**
+ * Abstraction of a Meter provider for virtual network.
+ */
+public interface VirtualMeterProvider extends VirtualProvider {
+    /**
+     * Performs a batch of meter operation on the specified virtual device
+     * with the specified parameters.
+     *
+     * @param networkId the identity of the virtual network where this rule applies
+     * @param deviceId device identifier on which the batch of group
+     * operations to be executed
+     * @param meterOps immutable list of meter operation
+     */
+    void performMeterOperation(NetworkId networkId, DeviceId deviceId,
+                               MeterOperations meterOps);
+
+
+    /**
+     * Performs a meter operation on the specified vitual device with the
+     * specified parameters.
+     *
+     * @param networkId the identity of the virtual network where this rule applies
+     * @param deviceId device identifier on which the batch of group
+     * operations to be executed
+     * @param meterOp a meter operation
+     */
+    void performMeterOperation(NetworkId networkId, DeviceId deviceId,
+                               MeterOperation meterOp);
+}
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/provider/VirtualMeterProviderService.java b/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/provider/VirtualMeterProviderService.java
new file mode 100644
index 0000000..c49c598
--- /dev/null
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/provider/VirtualMeterProviderService.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2016-present 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.virtual.provider;
+
+import org.onosproject.incubator.net.virtual.NetworkId;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.meter.Meter;
+import org.onosproject.net.meter.MeterFailReason;
+import org.onosproject.net.meter.MeterOperation;
+
+import java.util.Collection;
+
+/**
+ * Service through which meter providers can inject information
+ * into the virtual network subsystem core.
+ */
+public interface VirtualMeterProviderService
+        extends VirtualProviderService<VirtualMeterProvider> {
+    /**
+     * Notifies the core that a meter operation failed for a
+     * specific reason.
+     *
+     * @param networkId the identity of the virtual network where this rule applies
+     * @param operation the failed operation
+     * @param reason the failure reason
+     */
+    void meterOperationFailed(NetworkId networkId, MeterOperation operation,
+                              MeterFailReason reason);
+
+    /**
+     * Pushes the collection of meters observed on the virtual data plane as
+     * well as their associated statistics.
+     *
+     * @param networkId the identity of the virtual network where this rule applies
+     * @param deviceId a device id
+     * @param meterEntries a collection of meter entries
+     */
+    void pushMeterMetrics(NetworkId networkId, DeviceId deviceId,
+                          Collection<Meter> meterEntries);
+}