/*
* 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.io.Serializable;
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 final 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 static class LatestEntryComparator implements Comparator<Pair<ActorRef, Long>>, Serializable {
private static final long serialVersionUID = 1L;
@Override
public int compare(Pair<ActorRef, Long> o1, Pair<ActorRef, Long> o2) {
if (o1 == null && o2 == null) {
return 0;
}
if (o1 != null && o2 != null && o1.second() == null && o2.second() == null) {
return 0;
}
if ((o1 == null || o1.second() == null) && o2 != null) {
return -1;
}
if (o2 == null || o2.second() == null) {
return 1;
}
return o1.second().compareTo(o2.second());
}
}
}