| /** |
| * 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.hadoop.yarn.server.resourcemanager.scheduler.policy; |
| |
| import java.util.Comparator; |
| |
| import org.apache.hadoop.yarn.api.records.Priority; |
| |
| /** |
| * A Comparator which orders SchedulableEntities by priority. |
| */ |
| public class PriorityComparator implements Comparator<SchedulableEntity> { |
| |
| @Override |
| public int compare(SchedulableEntity se1, SchedulableEntity se2) { |
| Priority p1 = se1.getPriority(); |
| Priority p2 = se2.getPriority(); |
| if (p1 == null && p2 == null) { |
| return 0; |
| } else if (p1 == null) { |
| return -1; |
| } else if (p2 == null) { |
| return 1; |
| } |
| return p1.compareTo(p2); |
| } |
| } |