001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.reef.runtime.common.utils; 020 021/** 022 * Constants used by different REEF modules. 023 */ 024public final class Constants { 025 026 /** 027 * Any modifier. Used as a wildcard to specify that evaluators can be 028 * allocated in any rack. 029 */ 030 public static final String ANY_RACK = "*"; 031 032 /** 033 * Rack path separator. Used to separate the fully qualified rack name of an 034 * evaluator, e.g. /dc1/room1/rack1 035 */ 036 public static final String RACK_PATH_SEPARATOR = "/"; 037 038 /** 039 * Empty private constructor to prohibit instantiation of utility class. 040 */ 041 private Constants() { 042 } 043}