Mercurial > hg > blitz_condensed
annotate src/org/prevayler/implementation/NumberFileCreator.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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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 } |