Gather I*Storage and it's impl to core
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/ILinkStorage.java b/src/main/java/net/onrc/onos/ofcontroller/core/ILinkStorage.java
new file mode 100644
index 0000000..dfdabd4
--- /dev/null
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/ILinkStorage.java
@@ -0,0 +1,53 @@
+package net.onrc.onos.ofcontroller.core;
+
+import java.util.List;
+
+import net.floodlightcontroller.linkdiscovery.LinkInfo;
+import net.floodlightcontroller.routing.Link;
+
+public interface ILinkStorage extends INetMapStorage {
+
+ /*
+ * Link creation
+ */
+ public void update(Link link, DM_OPERATION op);
+ public void update(Link link, LinkInfo linkinfo, DM_OPERATION op);
+ public void update(List<Link> List, DM_OPERATION op);
+
+ /*
+ * Add Linkinfo
+ */
+ public void updateLink (Link link, LinkInfo linkinfo, DM_OPERATION op);
+
+ /*
+ * Delete a single link
+ */
+ public void deleteLink(Link link);
+
+ /*
+ * Delete links associated with dpid and port
+ * If only dpid is used, All links associated for switch are removed
+ * Useful for port up/down and also switch join/remove events
+ */
+ public void deleteLinksOnPort(Long dpid, short port);
+
+ /*
+ * Delete a list of links
+ */
+ public void deleteLinks(List<Link> links);
+
+ /*
+ * Get Links from Storage
+ * If dpid and port both are specified specific link is retrieved
+ * If only dpid is set all links associated with Switch are retrieved
+ */
+ public List<Link> getLinks(Long dpid, short port);
+ public List<Link> getLinks(String dpid);
+ public List<Link> getActiveLinks();
+
+ /*
+ * Init with Storage conf
+ */
+ public void init(String conf);
+
+}