Mercurial > hg > blitz_stable
annotate src/org/prevayler/implementation/CommandInputStream.java @ 35:6f68e94c1fb8 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 org.prevayler.*; |
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41 |
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42 /** Provides an easy API for reading commands and snapshots. |
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43 */ |
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44 class CommandInputStream { |
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45 |
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46 public CommandInputStream(String directory) throws IOException { |
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47 fileFinder = new NumberFileFinder(directory); |
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48 } |
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49 |
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50 public PrevalentSystem readLastSnapshot() throws IOException, ClassNotFoundException { |
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51 File snapshotFile = fileFinder.lastSnapshot(); |
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52 if (snapshotFile == null) return null; |
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53 out(snapshotFile); |
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54 |
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55 ObjectInputStream ois = new ObjectInputStream(new FileInputStream(snapshotFile)); |
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56 try { |
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57 return (PrevalentSystem)ois.readObject(); |
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58 } finally { |
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59 ois.close(); |
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60 } |
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61 } |
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62 |
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63 public Command readCommand() throws IOException, ClassNotFoundException { |
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64 if (currentLogStream == null) currentLogStream = newLogStream(); //Throws EOFException if there are no more log streams. |
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65 |
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66 try { |
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67 return (Command)currentLogStream.readObject(); |
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68 } catch (EOFException eof) { |
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69 //No more commands in this file. |
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70 } catch (ObjectStreamException osx) { |
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71 logStreamExceptionMessage(osx); |
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72 } catch (RuntimeException rx) { |
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73 logStreamExceptionMessage(rx); //Some stream corruptions cause runtime exceptions! |
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74 } |
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75 |
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76 currentLogStream.close(); |
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77 currentLogStream = null; |
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78 return readCommand(); |
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79 } |
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80 |
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81 public CommandOutputStream commandOutputStream(boolean shouldReset, |
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82 boolean shouldClean, |
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83 int aBufferSize) { |
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84 return new CommandOutputStream(fileFinder.fileCreator(), shouldReset, |
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85 shouldClean, aBufferSize); |
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86 } |
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87 |
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88 private ObjectInputStream newLogStream() throws IOException { |
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89 File logFile = fileFinder.nextPendingLog(); //Throws EOFException if there are no more pending log files. |
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90 out(logFile); |
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91 return new ObjectInputStream(new BufferedInputStream(new FileInputStream(logFile))); |
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92 } |
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93 |
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94 private void logStreamExceptionMessage(Exception exception) { |
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95 out(" " + exception); |
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96 out(" Some commands might have been lost. Looking for the next file..." ); |
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97 } |
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98 |
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99 private static void out(File file) { |
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100 out("Reading: " + file + "..."); |
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101 } |
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102 |
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103 private static void out(Object obj) { |
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104 System.out.println(obj); |
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105 } |
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106 |
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107 private NumberFileFinder fileFinder; |
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108 private ObjectInputStream currentLogStream; |
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109 } |