[Falcon] ONOS-3372 Link related Service on gRPC

Change-Id: Ib497d17cb3c0126086a1ce03a6f99ae344320448
diff --git a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/StubLinkProvider.java b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/StubLinkProvider.java
new file mode 100644
index 0000000..427dc4d
--- /dev/null
+++ b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/StubLinkProvider.java
@@ -0,0 +1,40 @@
+/*
+ * 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.rpc.grpc;
+
+import org.onosproject.net.link.LinkProvider;
+import org.onosproject.net.provider.AbstractProvider;
+import org.onosproject.net.provider.ProviderId;
+
+import com.google.api.client.repackaged.com.google.common.annotations.Beta;
+import com.google.common.base.MoreObjects;
+
+/**
+ * Stub LinkProvider to be registered on Server-side.
+ */
+@Beta
+final class StubLinkProvider extends AbstractProvider implements LinkProvider {
+    protected StubLinkProvider(String scheme) {
+        super(new ProviderId(scheme, GrpcRemoteServiceServer.RPC_PROVIDER_NAME));
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("id", id())
+                .toString();
+    }
+}