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, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 019package org.apache.hadoop.fs; 020 021import java.util.Arrays; 022import java.util.ArrayList; 023import java.util.List; 024 025import org.apache.hadoop.classification.InterfaceAudience; 026import org.apache.hadoop.classification.InterfaceStability; 027import org.apache.hadoop.util.StringUtils; 028 029/** 030 * Defines the types of supported storage media. The default storage 031 * medium is assumed to be DISK. 032 */ 033@InterfaceAudience.Public 034@InterfaceStability.Unstable 035public enum StorageType { 036 // sorted by the speed of the storage types, from fast to slow 037 RAM_DISK(true), 038 SSD(false), 039 DISK(false), 040 ARCHIVE(false); 041 042 private final boolean isTransient; 043 044 public static final StorageType DEFAULT = DISK; 045 046 public static final StorageType[] EMPTY_ARRAY = {}; 047 048 private static final StorageType[] VALUES = values(); 049 050 StorageType(boolean isTransient) { 051 this.isTransient = isTransient; 052 } 053 054 public boolean isTransient() { 055 return isTransient; 056 } 057 058 public boolean supportTypeQuota() { 059 return !isTransient; 060 } 061 062 public boolean isMovable() { 063 return !isTransient; 064 } 065 066 public static List<StorageType> asList() { 067 return Arrays.asList(VALUES); 068 } 069 070 public static List<StorageType> getMovableTypes() { 071 return getNonTransientTypes(); 072 } 073 074 public static List<StorageType> getTypesSupportingQuota() { 075 return getNonTransientTypes(); 076 } 077 078 public static StorageType parseStorageType(int i) { 079 return VALUES[i]; 080 } 081 082 public static StorageType parseStorageType(String s) { 083 return StorageType.valueOf(StringUtils.toUpperCase(s)); 084 } 085 086 private static List<StorageType> getNonTransientTypes() { 087 List<StorageType> nonTransientTypes = new ArrayList<>(); 088 for (StorageType t : VALUES) { 089 if ( t.isTransient == false ) { 090 nonTransientTypes.add(t); 091 } 092 } 093 return nonTransientTypes; 094 } 095}