Mercurial > hg > blitz_stable

annotate src/org/prevayler/implementation/NumberFileFinder.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /*
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2 The copyright of all source code included in this Prevayler distribution is
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3 held by Klaus Wuestefeld, except the files that specifically state otherwise.
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4 All rights are reserved. "PREVAYLER" is a trademark of Klaus Wuestefeld.
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5
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6
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7 BSD License:
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8
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9 Redistribution and use in source and binary forms, with or without
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10 modification, are permitted provided that the following conditions are met:
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11
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12 - Redistributions of source code must retain the above copyright notice, this
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13 list of conditions and the following disclaimer.
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14
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15 - Redistributions in binary form must reproduce the above copyright notice,
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16 this list of conditions and the following disclaimer in the documentation
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17 and/or other materials provided with the distribution.
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18
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19 - Neither the name of Prevayler nor the names of its contributors may be used
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20 to endorse or promote products derived from this software without specific
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21 prior written permission.
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22
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23
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24 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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25 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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26 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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27 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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28 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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29 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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30 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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31 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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32 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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33 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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34 POSSIBILITY OF SUCH DAMAGE.
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35 */
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36
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37 package org.prevayler.implementation;
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38
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39 import java.io.*;
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40 import java.util.Arrays;
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41 import java.text.*;
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42
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43 /** Finds the last .snapshot file by number and finds all the subsequent pending .log files.
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44 */
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45 class NumberFileFinder {
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46
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47 private File directory;
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48 private File lastSnapshot;
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49 private long fileNumber;
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50 private NumberFileCreator fileCreator;
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51
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52 /** @throws IOException if location does not exist and cannot be created as a directory.
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53 * @throws IllegalArgumentException If location exists and is not a directory.
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54 */
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55 public NumberFileFinder(String directoryName) throws IOException {
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56 this.directory = new File(directoryName);
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57 if (!directory.exists() && !directory.mkdirs()) throw new IOException("Directory doesn't exist and could not be created: " + directoryName);
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58 if (!directory.isDirectory()) throw new IllegalArgumentException("Path exists but is not a directory: " + directoryName);
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59
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60 init();
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61 }
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62
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63 /** Returns the last snapshot file. Returns null if there are no snapshots.
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64 */
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65 public File lastSnapshot() {
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66 return lastSnapshot;
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67 }
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68
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69 /** @throws EOFException if there are no more pending .log files.
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70 */
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71 public File nextPendingLog() throws EOFException {
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72 File log = new File(directory, NumberFileCreator.LOG_FORMAT.format(fileNumber + 1));
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73 if (!log.exists()) {
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74 fileCreator = new NumberFileCreator(directory, fileNumber + 1);
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75 throw new EOFException();
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76 }
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77 ++fileNumber;
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78 return log;
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79 }
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80
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81 /** Returns a NumberFileCreator that will start off with the first number after the last .log file number.
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82 * @return null if there are still .log files pending.
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83 */
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84 public NumberFileCreator fileCreator() {
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85 return fileCreator;
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86 }
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87
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88 private void init() throws IOException {
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89 findLastSnapshot();
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90 fileNumber = lastSnapshot == null
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91 ? 0
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92 : number(lastSnapshot);
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93 }
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94
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95 private long number(File snapshot) throws NumberFormatException { //NumberFomatException is a RuntimeException.
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96 String name = snapshot.getName();
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97 if (!name.endsWith("." + NumberFileCreator.SNAPSHOT_SUFFIX)) throw new NumberFormatException();
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98 return Long.parseLong(name.substring(0,name.indexOf('.'))); // "00000.snapshot" becomes "00000".
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99 //The following doesn't work! It throws ParseException (UnparseableNumber): return (NumberFileCreator.SNAPSHOT_FORMAT.parse(snapshot.getName())).longValue();
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100 }
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101
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102 private void findLastSnapshot() throws IOException {
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103 File[] snapshots = directory.listFiles(new SnapshotFilter());
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104 if (snapshots == null) throw new IOException("Error reading file list from directory " + directory);
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105
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106 Arrays.sort(snapshots);
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107
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108 lastSnapshot = snapshots.length > 0
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109 ? snapshots[snapshots.length - 1]
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110 : null;
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111 }
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112
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113
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114 private class SnapshotFilter implements FileFilter {
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115
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116 public boolean accept(File file) {
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117 try {
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118 number(file);
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119 } catch (NumberFormatException nfx) {
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120 return false;
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121 }
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122 return true;
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123 }
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124 }
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125
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126 }