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 DISK(false), 037 SSD(false), 038 ARCHIVE(false), 039 RAM_DISK(true); 040 041 private final boolean isTransient; 042 043 public static final StorageType DEFAULT = DISK; 044 045 public static final StorageType[] EMPTY_ARRAY = {}; 046 047 private static final StorageType[] VALUES = values(); 048 049 StorageType(boolean isTransient) { 050 this.isTransient = isTransient; 051 } 052 053 public boolean isTransient() { 054 return isTransient; 055 } 056 057 public boolean supportTypeQuota() { 058 return !isTransient; 059 } 060 061 public boolean isMovable() { 062 return !isTransient; 063 } 064 065 public static List<StorageType> asList() { 066 return Arrays.asList(VALUES); 067 } 068 069 public static List<StorageType> getMovableTypes() { 070 return getNonTransientTypes(); 071 } 072 073 public static List<StorageType> getTypesSupportingQuota() { 074 return getNonTransientTypes(); 075 } 076 077 public static StorageType parseStorageType(int i) { 078 return VALUES[i]; 079 } 080 081 public static StorageType parseStorageType(String s) { 082 return StorageType.valueOf(StringUtils.toUpperCase(s)); 083 } 084 085 private static List<StorageType> getNonTransientTypes() { 086 List<StorageType> nonTransientTypes = new ArrayList<>(); 087 for (StorageType t : VALUES) { 088 if ( t.isTransient == false ) { 089 nonTransientTypes.add(t); 090 } 091 } 092 return nonTransientTypes; 093 } 094}