Enable operation in a multi-instance cluster

Change-Id: Ia384fbd972d8866f5dd893c523b5d43ef17e6458
diff --git a/api/src/main/java/org/opencord/dhcpl2relay/DhcpL2RelayService.java b/api/src/main/java/org/opencord/dhcpl2relay/DhcpL2RelayService.java
index 76957ab..6d3d16a 100644
--- a/api/src/main/java/org/opencord/dhcpl2relay/DhcpL2RelayService.java
+++ b/api/src/main/java/org/opencord/dhcpl2relay/DhcpL2RelayService.java
@@ -18,9 +18,18 @@
 
 import org.onosproject.event.ListenerService;
 
+import java.util.Map;
+
 /**
  * DHCP L2 relay service.
  */
 public interface DhcpL2RelayService extends
         ListenerService<DhcpL2RelayEvent, DhcpL2RelayListener> {
+
+    /**
+     * Returns information about DHCP leases that have been allocated.
+     *
+     * @return map of subscriber ID to DHCP allocation information
+     */
+    Map<String, DhcpAllocationInfo> getAllocationInfo();
 }