Follow ONOS naming convention in PIM application

Change-Id: Id553a89630b44eafc791e54e54b043fb4182e324
diff --git a/apps/pim/src/main/java/org/onosproject/pim/impl/PimInterfaceService.java b/apps/pim/src/main/java/org/onosproject/pim/impl/PimInterfaceService.java
new file mode 100644
index 0000000..16082df
--- /dev/null
+++ b/apps/pim/src/main/java/org/onosproject/pim/impl/PimInterfaceService.java
@@ -0,0 +1,45 @@
+/*
+ * 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.pim.impl;
+
+import org.onosproject.net.ConnectPoint;
+
+import java.util.Set;
+
+/**
+ * Define the PIMInterfaceService.  PIM will use ONOS Interfaces to
+ * define PIM Interfaces.  The PIM Application signed up as a Netconfig
+ * listener.
+ *
+ * TODO: Do we need a PIMInterfaceListenerService?  Who sould listen to Interfaces changes?
+ */
+public interface PimInterfaceService {
+
+    /**
+     * Returns the PIM interface associated with the given connect point.
+     *
+     * @param cp the connect point we want to get the PIM interface for
+     * @return the PIM interface if it exists, otherwise null
+     */
+    PimInterface getPimInterface(ConnectPoint cp);
+
+    /**
+     * Retrieves the set of all interfaces running PIM.
+     *
+     * @return set of PIM interfaces
+     */
+    Set<PimInterface> getPimInterfaces();
+}