Mercurial > hg > blitz_stable

annotate src/org/prevayler/implementation/NumberFileCleaner.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 package org.prevayler.implementation;
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2
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3 import org.dancres.blitz.txn.TxnManager;
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4
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5 import java.io.File;
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6 import java.io.FileFilter;
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7
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8 import java.util.Arrays;
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9 import java.util.logging.Level;
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10
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11 /**
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12 <p>Cleans up old log files and snapshots. Helper class produced from a
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13 NumberFileCreator which can be used by a programmer to clean up no longer
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14 required log files and snapshots. Not all deployments will want to use this
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15 as some will wish to archive all such logs and snapshots for recovery
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16 purposes or to satisfy certain legal requirements.</p>
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17 */
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18 class NumberFileCleaner {
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19 File theDirectory;
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20
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21 NumberFileCleaner(File aDirectory) {
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22 theDirectory = aDirectory;
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23 }
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24
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25 void clean() {
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26 File[] myFiles = theDirectory.listFiles(new SnapshotFilter());
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27
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28 Arrays.sort(myFiles);
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29
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30 /*
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31 for (int i = (myFiles.length -1); i >-1; i--) {
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32 TxnManager.theLogger.log(Level.SEVERE, "Ordered: " + myFiles[i]);
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33 }
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34 */
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35
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36 int myLastSnapshot = findLastSnapshot(myFiles);
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37
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38 if (myLastSnapshot != -1) {
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39 for (int i = (myLastSnapshot - 1); i > -1; i--) {
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40 // TxnManager.theLogger.log(Level.SEVERE, "Delete: " + myFiles[i]);
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41 myFiles[i].delete();
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42 }
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43 }
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44 }
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45
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46 private int findLastSnapshot(File[] aFiles) {
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47 for (int i = (aFiles.length - 1); i > -1; i--) {
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48 File myFile = aFiles[i];
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49 if (myFile.getName().endsWith("." +
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50 NumberFileCreator.SNAPSHOT_SUFFIX)) {
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51 return i;
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52 }
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53 }
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54
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55 return -1;
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56 }
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57
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58 private static class SnapshotFilter implements FileFilter {
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59 public boolean accept(File aFile) {
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60 String myName = aFile.getName();
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61
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62 if ((aFile.isDirectory()) ||
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63 ((!myName.endsWith("." +
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64 NumberFileCreator.SNAPSHOT_SUFFIX)) &&
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65 (!myName.endsWith("." +
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66 NumberFileCreator.LOGFILE_SUFFIX))))
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67 return false;
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68
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69 try {
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70 Long.parseLong(myName.substring(0,myName.indexOf('.')));
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71
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72 return true;
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73 } catch (NumberFormatException nfx) {
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74 return false;
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75 }
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76 }
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77 }
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78
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79
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80 }