+/*
+ * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+
+package org.opendaylight.controller.remote.rpc.utils;
+
+import akka.actor.ActorRef;
+import akka.japi.Pair;
+import com.google.common.base.Preconditions;
+
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.SortedSet;
+import java.util.TreeSet;
+
+/**
+ * This class will return First Entry
+ */
+public class LatestEntryRoutingLogic implements RoutingLogic{
+
+ private SortedSet<Pair<ActorRef, Long>> actorRefSet;
+
+ public LatestEntryRoutingLogic(Collection<Pair<ActorRef, Long>> entries) {
+ Preconditions.checkNotNull(entries, "Entries should not be null");
+ Preconditions.checkArgument(!entries.isEmpty(), "Entries collection should not be empty");
+
+ actorRefSet = new TreeSet<>(new LatestEntryComparator());
+ actorRefSet.addAll(entries);
+ }
+
+ @Override
+ public ActorRef select() {
+ return actorRefSet.last().first();
+ }
+
+
+ private class LatestEntryComparator implements Comparator<Pair<ActorRef, Long>> {
+
+ @Override
+ public int compare(Pair<ActorRef, Long> o1, Pair<ActorRef, Long> o2) {
+ if(o1 == null && o2 == null) {
+ return 0;
+ }
+ if(o1 == null && o2 != null) {
+ return -1;
+ }
+ if(o1 != null && o2 == null) {
+ return 1;
+ }
+
+ return o1.second().compareTo(o2.second());
+
+ }
+
+ }
+}
+
+