| /** |
| * 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.resource; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.classification.InterfaceStability.Evolving; |
| import org.apache.hadoop.yarn.api.records.Resource; |
| import org.apache.hadoop.yarn.util.Records; |
| |
| @Private |
| @Evolving |
| public class Resources { |
| // Java doesn't have const :( |
| private static final Resource NONE = createResource(0); |
| |
| public static Resource createResource(int memory) { |
| Resource resource = Records.newRecord(Resource.class); |
| resource.setMemory(memory); |
| return resource; |
| } |
| |
| public static Resource none() { |
| assert NONE.getMemory() == 0 : "NONE should be empty"; |
| return NONE; |
| } |
| |
| public static Resource clone(Resource res) { |
| return createResource(res.getMemory()); |
| } |
| |
| public static Resource addTo(Resource lhs, Resource rhs) { |
| lhs.setMemory(lhs.getMemory() + rhs.getMemory()); |
| return lhs; |
| } |
| |
| public static Resource add(Resource lhs, Resource rhs) { |
| return addTo(clone(lhs), rhs); |
| } |
| |
| public static Resource subtractFrom(Resource lhs, Resource rhs) { |
| lhs.setMemory(lhs.getMemory() - rhs.getMemory()); |
| return lhs; |
| } |
| |
| public static Resource subtract(Resource lhs, Resource rhs) { |
| return subtractFrom(clone(lhs), rhs); |
| } |
| |
| public static Resource negate(Resource resource) { |
| return subtract(NONE, resource); |
| } |
| |
| public static Resource multiplyTo(Resource lhs, int by) { |
| lhs.setMemory(lhs.getMemory() * by); |
| return lhs; |
| } |
| |
| public static Resource multiply(Resource lhs, int by) { |
| return multiplyTo(clone(lhs), by); |
| } |
| |
| public static boolean equals(Resource lhs, Resource rhs) { |
| return lhs.getMemory() == rhs.getMemory(); |
| } |
| |
| public static boolean lessThan(Resource lhs, Resource rhs) { |
| return lhs.getMemory() < rhs.getMemory(); |
| } |
| |
| public static boolean lessThanOrEqual(Resource lhs, Resource rhs) { |
| return lhs.getMemory() <= rhs.getMemory(); |
| } |
| |
| public static boolean greaterThan(Resource lhs, Resource rhs) { |
| return lhs.getMemory() > rhs.getMemory(); |
| } |
| |
| public static boolean greaterThanOrEqual(Resource lhs, Resource rhs) { |
| return lhs.getMemory() >= rhs.getMemory(); |
| } |
| } |