com.liferay.registry.ServiceRankingUtil Maven / Gradle / Ivy
/**
* Copyright (c) 2000-present Liferay, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
package com.liferay.registry;
import java.util.Comparator;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Stream;
/**
* @author Shuyang Zhou
*/
public class ServiceRankingUtil {
public static int compare(
ServiceReference serviceReference1,
ServiceReference serviceReference2) {
int value = Integer.compare(
_getServiceRanking(serviceReference1),
_getServiceRanking(serviceReference2));
if (value != 0) {
return value;
}
return -Long.compare(
(Long)serviceReference1.getProperty("service.id"),
(Long)serviceReference2.getProperty("service.id"));
}
public static Optional, T>>
getHighestRankingEntry(Map, T> services) {
Set, T>> entrySet = services.entrySet();
Stream, T>> stream = entrySet.stream();
return stream.max(
Comparator.comparing(
Map.Entry::getKey, ServiceRankingUtil::compare));
}
private static int _getServiceRanking(
ServiceReference serviceReference) {
Object serviceRanking = serviceReference.getProperty("service.ranking");
if (serviceRanking instanceof Integer) {
return (Integer)serviceRanking;
}
if (serviceRanking instanceof String) {
try {
return Integer.parseInt((String)serviceRanking);
}
catch (NumberFormatException nfe) {
}
}
return 0;
}
}