| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.slider.server.appmaster.state; |
| |
| import org.apache.slider.common.tools.Comparators; |
| |
| import java.io.Serializable; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| |
| /** |
| * Sort the candidate list by the most recent container first. |
| */ |
| public class MostRecentContainerReleaseSelector implements ContainerReleaseSelector { |
| |
| @Override |
| public List<RoleInstance> sortCandidates(int roleId, |
| List<RoleInstance> candidates, |
| int minimumToSelect) { |
| Collections.sort(candidates, new newerThan()); |
| return candidates; |
| } |
| |
| private static class newerThan implements Comparator<RoleInstance>, Serializable { |
| private final Comparator<Long> innerComparator = |
| new Comparators.ComparatorReverser<Long>(new Comparators.LongComparator()); |
| public int compare(RoleInstance o1, RoleInstance o2) { |
| return innerComparator.compare(o1.createTime, o2.createTime); |
| |
| } |
| |
| } |
| |
| |
| } |