Mercurial > hg > blitz_stable
annotate src/org/prevayler/implementation/NumberFileCleaner.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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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 } |