Refactor protocol buffer to split models into different packages

Change-Id: I26152ba227ebe9afd871c6e501ccca17c49e1e4e
diff --git a/incubator/protobuf/models/src/main/proto/net/link/LinkDescriptionProto.proto b/incubator/protobuf/models/src/main/proto/net/link/LinkDescriptionProto.proto
new file mode 100644
index 0000000..d24545d
--- /dev/null
+++ b/incubator/protobuf/models/src/main/proto/net/link/LinkDescriptionProto.proto
@@ -0,0 +1,14 @@
+syntax = "proto3";
+option java_package = "org.onosproject.grpc.net.link.models";
+
+package net.link;
+
+import "net/ConnectPointProto.proto";
+import "net/link/LinkEnumsProto.proto";
+
+message LinkDescriptionProto {
+    net.ConnectPointProto src = 1;
+    net.ConnectPointProto dst = 2;
+    net.link.LinkTypeProto type = 3;
+    map<string, string> annotations = 4;
+}
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diff --git a/incubator/protobuf/models/src/main/proto/net/link/LinkEnumsProto.proto b/incubator/protobuf/models/src/main/proto/net/link/LinkEnumsProto.proto
new file mode 100644
index 0000000..0f06aa0
--- /dev/null
+++ b/incubator/protobuf/models/src/main/proto/net/link/LinkEnumsProto.proto
@@ -0,0 +1,40 @@
+syntax = "proto3";
+option java_package = "org.onosproject.grpc.net.link.models";
+
+package net.link;
+
+enum LinkTypeProto {
+    // Signifies that this is a direct single-segment link.
+    DIRECT = 0;
+
+    // Signifies that this link is potentially comprised from multiple
+    // underlying segments or hops, and as such should be used to tag
+    // links traversing optical paths, tunnels or intervening 'dark'
+    // switches.
+    INDIRECT = 1;
+
+    // Signifies that this link is an edge, i.e. host link.
+    EDGE = 2;
+
+    // Signifies that this link represents a logical link backed by
+    // some form of a tunnel, e.g., GRE, MPLS, ODUk, OCH.
+    TUNNEL = 3;
+
+    // Signifies that this link is realized by fiber (either single channel or WDM).
+    OPTICAL = 4;
+
+    // Signifies that this link is a virtual link or a pseudo-wire.
+    VIRTUAL = 5;
+}
+
+enum LinkStateProto {
+    ACTIVE = 0;
+    INACTIVE = 1;
+}
+
+// Link Event Types
+enum LinkEventTypeProto {
+    LINK_ADDED = 0;
+    LINK_UPDATED = 1;
+    LINK_REMOVED = 2;
+}
diff --git a/incubator/protobuf/models/src/main/proto/net/link/LinkEventProto.proto b/incubator/protobuf/models/src/main/proto/net/link/LinkEventProto.proto
new file mode 100644
index 0000000..1ad93b7
--- /dev/null
+++ b/incubator/protobuf/models/src/main/proto/net/link/LinkEventProto.proto
@@ -0,0 +1,13 @@
+syntax = "proto3";
+option java_package = "org.onosproject.grpc.net.link.models";
+
+package net.link;
+
+import "net/LinkProto.proto";
+import "net/link/LinkEnumsProto.proto";
+
+// Corresponds to org.onosproject.net.link.LinkEvent.
+message LinkNotificationProto {
+    net.link.LinkEventTypeProto link_event_type = 1;
+    net.LinkProto link = 2;
+}
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