ONOS- 2946 Adding ability to view packet processor statistics.

Change-Id: Ic55ec670b197b1ee08f2d11f97658fd614da1614
diff --git a/core/api/src/main/java/org/onosproject/net/packet/PacketProcessorEntry.java b/core/api/src/main/java/org/onosproject/net/packet/PacketProcessorEntry.java
new file mode 100644
index 0000000..40386fb
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/packet/PacketProcessorEntry.java
@@ -0,0 +1,58 @@
+/*
+ * 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.net.packet;
+
+/**
+ * Packet processor entry tracking the processor, its priority and
+ * time consumption.
+ */
+public interface PacketProcessorEntry {
+
+    /**
+     * Returns the packet processor.
+     *
+     * @return packet processor
+     */
+    PacketProcessor processor();
+
+    /**
+     * Returns the packet processor priority.
+     *
+     * @return processor priority
+     */
+    int priority();
+
+    /**
+     * Returns the number of invocations.
+     *
+     * @return number of invocations
+     */
+    long invocations();
+
+    /**
+     * Returns the total time, in nanoseconds, spent processing packets.
+     *
+     * @return total time in nanos
+     */
+    long totalNanos();
+
+    /**
+     * Returns the average time, in nanoseconds, spent processing packets.
+     *
+     * @return average time in nanos
+     */
+    long averageNanos();
+}