1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | |
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19 | package org.apache.hadoop.fs.s3; |
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20 | |
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21 | import java.io.BufferedInputStream; |
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22 | import java.io.BufferedOutputStream; |
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23 | import java.io.ByteArrayOutputStream; |
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24 | import java.io.File; |
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25 | import java.io.FileInputStream; |
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26 | import java.io.FileOutputStream; |
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27 | import java.io.IOException; |
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28 | import java.net.URI; |
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29 | import java.util.HashMap; |
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30 | import java.util.LinkedHashSet; |
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31 | import java.util.Map; |
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32 | import java.util.Set; |
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33 | import java.util.SortedMap; |
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34 | import java.util.TreeMap; |
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35 | |
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36 | import org.apache.hadoop.conf.Configuration; |
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37 | import org.apache.hadoop.fs.Path; |
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38 | import org.apache.hadoop.fs.s3.INode.FileType; |
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39 | |
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40 | /** |
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41 | * A stub implementation of {@link FileSystemStore} for testing |
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42 | * {@link S3FileSystem} without actually connecting to S3. |
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43 | */ |
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44 | class InMemoryFileSystemStore implements FileSystemStore { |
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45 | |
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46 | private Configuration conf; |
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47 | private SortedMap<Path, INode> inodes = new TreeMap<Path, INode>(); |
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48 | private Map<Long, byte[]> blocks = new HashMap<Long, byte[]>(); |
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49 | |
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50 | public void initialize(URI uri, Configuration conf) { |
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51 | this.conf = conf; |
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52 | } |
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53 | |
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54 | public String getVersion() throws IOException { |
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55 | return "0"; |
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56 | } |
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57 | |
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58 | public void deleteINode(Path path) throws IOException { |
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59 | inodes.remove(normalize(path)); |
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60 | } |
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61 | |
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62 | public void deleteBlock(Block block) throws IOException { |
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63 | blocks.remove(block.getId()); |
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64 | } |
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65 | |
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66 | public boolean inodeExists(Path path) throws IOException { |
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67 | return inodes.containsKey(normalize(path)); |
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68 | } |
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69 | |
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70 | public boolean blockExists(long blockId) throws IOException { |
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71 | return blocks.containsKey(blockId); |
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72 | } |
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73 | |
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74 | public INode retrieveINode(Path path) throws IOException { |
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75 | return inodes.get(normalize(path)); |
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76 | } |
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77 | |
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78 | public File retrieveBlock(Block block, long byteRangeStart) throws IOException { |
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79 | byte[] data = blocks.get(block.getId()); |
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80 | File file = createTempFile(); |
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81 | BufferedOutputStream out = null; |
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82 | try { |
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83 | out = new BufferedOutputStream(new FileOutputStream(file)); |
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84 | out.write(data, (int) byteRangeStart, data.length - (int) byteRangeStart); |
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85 | } finally { |
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86 | if (out != null) { |
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87 | out.close(); |
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88 | } |
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89 | } |
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90 | return file; |
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91 | } |
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92 | |
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93 | private File createTempFile() throws IOException { |
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94 | File dir = new File(conf.get("fs.s3.buffer.dir")); |
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95 | if (!dir.exists() && !dir.mkdirs()) { |
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96 | throw new IOException("Cannot create S3 buffer directory: " + dir); |
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97 | } |
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98 | File result = File.createTempFile("test-", ".tmp", dir); |
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99 | result.deleteOnExit(); |
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100 | return result; |
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101 | } |
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102 | |
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103 | public Set<Path> listSubPaths(Path path) throws IOException { |
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104 | Path normalizedPath = normalize(path); |
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105 | // This is inefficient but more than adequate for testing purposes. |
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106 | Set<Path> subPaths = new LinkedHashSet<Path>(); |
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107 | for (Path p : inodes.tailMap(normalizedPath).keySet()) { |
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108 | if (normalizedPath.equals(p.getParent())) { |
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109 | subPaths.add(p); |
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110 | } |
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111 | } |
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112 | return subPaths; |
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113 | } |
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114 | |
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115 | public Set<Path> listDeepSubPaths(Path path) throws IOException { |
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116 | Path normalizedPath = normalize(path); |
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117 | String pathString = normalizedPath.toUri().getPath(); |
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118 | if (!pathString.endsWith("/")) { |
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119 | pathString += "/"; |
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120 | } |
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121 | // This is inefficient but more than adequate for testing purposes. |
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122 | Set<Path> subPaths = new LinkedHashSet<Path>(); |
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123 | for (Path p : inodes.tailMap(normalizedPath).keySet()) { |
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124 | if (p.toUri().getPath().startsWith(pathString)) { |
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125 | subPaths.add(p); |
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126 | } |
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127 | } |
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128 | return subPaths; |
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129 | } |
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130 | |
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131 | public void storeINode(Path path, INode inode) throws IOException { |
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132 | inodes.put(normalize(path), inode); |
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133 | } |
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134 | |
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135 | public void storeBlock(Block block, File file) throws IOException { |
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136 | ByteArrayOutputStream out = new ByteArrayOutputStream(); |
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137 | byte[] buf = new byte[8192]; |
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138 | int numRead; |
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139 | BufferedInputStream in = null; |
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140 | try { |
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141 | in = new BufferedInputStream(new FileInputStream(file)); |
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142 | while ((numRead = in.read(buf)) >= 0) { |
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143 | out.write(buf, 0, numRead); |
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144 | } |
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145 | } finally { |
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146 | if (in != null) { |
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147 | in.close(); |
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148 | } |
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149 | } |
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150 | blocks.put(block.getId(), out.toByteArray()); |
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151 | } |
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152 | |
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153 | private Path normalize(Path path) { |
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154 | if (!path.isAbsolute()) { |
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155 | throw new IllegalArgumentException("Path must be absolute: " + path); |
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156 | } |
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157 | return new Path(path.toUri().getPath()); |
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158 | } |
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159 | |
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160 | public void purge() throws IOException { |
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161 | inodes.clear(); |
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162 | blocks.clear(); |
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163 | } |
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164 | |
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165 | public void dump() throws IOException { |
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166 | StringBuilder sb = new StringBuilder(getClass().getSimpleName()); |
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167 | sb.append(", \n"); |
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168 | for (Map.Entry<Path, INode> entry : inodes.entrySet()) { |
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169 | sb.append(entry.getKey()).append("\n"); |
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170 | INode inode = entry.getValue(); |
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171 | sb.append("\t").append(inode.getFileType()).append("\n"); |
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172 | if (inode.getFileType() == FileType.DIRECTORY) { |
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173 | continue; |
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174 | } |
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175 | for (int j = 0; j < inode.getBlocks().length; j++) { |
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176 | sb.append("\t").append(inode.getBlocks()[j]).append("\n"); |
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177 | } |
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178 | } |
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179 | System.out.println(sb); |
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180 | |
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181 | System.out.println(inodes.keySet()); |
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182 | System.out.println(blocks.keySet()); |
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183 | } |
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184 | |
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185 | } |
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