Mercurial > hg > blitz_stable

annotate src/org/prevayler/implementation/NumberFileCreator.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.text.*;
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41
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42 /** Creates .log and .snapshot files using a number sequence for the file name.
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43 */
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44 class NumberFileCreator {
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45
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46 public static final String SNAPSHOT_SUFFIX = "snapshot";
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47 public static final String LOGFILE_SUFFIX = "commandLog";
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48 public static final DecimalFormat SNAPSHOT_FORMAT = new DecimalFormat("000000000000000000000'.'" + SNAPSHOT_SUFFIX); //21 zeros (enough for a long number).
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49 public static final DecimalFormat LOG_FORMAT = new DecimalFormat("000000000000000000000'.'" + LOGFILE_SUFFIX); //21 zeros (enough for a long number).
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50
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51 private File directory;
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52 private long nextFileNumber;
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53
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54 public NumberFileCreator(File directory, long firstFileNumber) {
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55 this.directory = directory;
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56 this.nextFileNumber = firstFileNumber;
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57 }
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58
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59 File newLog() throws IOException {
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60 File log = new File(directory, LOG_FORMAT.format(nextFileNumber));
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61 if(!log.createNewFile()) throw new IOException("Attempt to create command log file that already existed: " + log);;
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62
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63 ++nextFileNumber;
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64 return log;
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65 }
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66
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67 File newSnapshot() throws IOException {
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68 File snapshot = new File(directory, SNAPSHOT_FORMAT.format(nextFileNumber - 1));
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69 snapshot.delete(); //If no commands are logged, the same snapshot file will be created over and over.
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70 return snapshot;
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71 }
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72
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73 File newTempSnapshot() throws IOException {
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74 return File.createTempFile("temp","generatingSnapshot",directory);
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75 }
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76
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77 NumberFileCleaner newCleaner() {
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78 return new NumberFileCleaner(directory);
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79 }
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80 }