Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/Readahead.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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0
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1 package org.dancres.blitz.entry; |
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2 |
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3 import org.dancres.blitz.ActiveObject; |
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4 import org.dancres.blitz.ActiveObjectRegistry; |
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5 import org.dancres.blitz.Logging; |
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6 import org.dancres.blitz.mangler.MangledEntry; |
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7 |
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8 import java.util.HashSet; |
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9 import java.util.Set; |
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10 import java.util.logging.Level; |
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11 import java.util.logging.Logger; |
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12 import java.io.IOException; |
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13 |
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14 import EDU.oswego.cs.dl.util.concurrent.QueuedExecutor; |
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15 |
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16 /** |
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17 */ |
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18 public class Readahead implements ActiveObject { |
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19 private static Logger theLogger = |
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20 Logging.newLogger("org.dancres.blitz.entry.Readahead"); |
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21 |
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22 private static Readahead theReadahead = new Readahead(); |
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23 |
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24 private QueuedExecutor theExecutor; |
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25 |
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26 private Set theActiveTemplates = new HashSet(); |
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27 |
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28 static Readahead get() { |
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29 return theReadahead; |
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30 } |
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31 |
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32 private Readahead() { |
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33 ActiveObjectRegistry.add(this); |
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34 } |
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35 |
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36 /** |
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37 * @return <code>true</code> if the readahead will go active |
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38 */ |
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39 boolean add(MangledEntry aTemplate, int aReadahead) { |
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40 if ((! aTemplate.isSnapshot()) && |
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41 (! aTemplate.isWildcard())) { |
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42 if (theLogger.isLoggable(Level.FINEST)) |
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43 theLogger.log(Level.FINEST, |
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44 "Readahead not snapshot/wildcard: " + aTemplate.getType()); |
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45 return false; |
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46 } |
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47 |
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48 if (aReadahead == 0) { |
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49 if (theLogger.isLoggable(Level.FINEST)) |
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50 theLogger.log(Level.FINEST, |
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51 "Readahead not set: " + aTemplate.getType()); |
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52 return false; |
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53 } |
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54 |
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55 synchronized(theActiveTemplates) { |
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56 if (! theActiveTemplates.contains(aTemplate)) { |
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57 if (theLogger.isLoggable(Level.FINEST)) |
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58 theLogger.log(Level.FINEST, |
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59 "Readahead going active: " + aReadahead); |
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60 theActiveTemplates.add(aTemplate); |
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61 |
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62 try { |
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63 theExecutor.execute(new ReadTask(aTemplate, aReadahead)); |
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64 } catch (InterruptedException anIE) { |
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65 // Doesn't matter it's just a readahead |
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66 } |
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67 |
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68 return true; |
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69 } else |
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70 return false; |
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71 } |
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72 } |
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73 |
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74 void remove(MangledEntry aTemplate) { |
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75 synchronized(theActiveTemplates) { |
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76 theActiveTemplates.remove(aTemplate); |
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77 } |
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78 } |
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79 |
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80 public void begin() { |
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81 theExecutor = new QueuedExecutor(); |
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82 } |
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83 |
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84 public void halt() { |
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85 theExecutor.shutdownNow(); |
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86 } |
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87 |
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88 static class ReadTask implements Runnable { |
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89 private MangledEntry theTemplate; |
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90 private int theReadahead; |
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91 |
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92 ReadTask(MangledEntry aTemplate, int aReadahead) { |
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93 theTemplate = aTemplate; |
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94 theReadahead = aReadahead; |
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95 } |
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96 |
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97 public void run() { |
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98 try { |
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99 String myType = theTemplate.getType(); |
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100 |
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101 EntryReposRecovery myRepos = |
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102 EntryRepositoryFactory.get().getAdmin(myType); |
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103 |
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104 // System.err.println("Attempting readahead of 10"); |
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105 |
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106 myRepos.find(theTemplate, new CountingVisitor(theReadahead)); |
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107 } catch (IOException anIOE) { |
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108 theLogger.log(Level.SEVERE, |
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109 "Readahead failed with", anIOE); |
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110 } finally { |
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111 Readahead.get().remove(theTemplate); |
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112 } |
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113 } |
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114 } |
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115 |
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116 static class CountingVisitor implements SearchVisitor { |
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117 private int theRequiredOffers; |
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118 private int theTotalOffers; |
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119 |
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120 CountingVisitor(int aRequired) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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121 theRequiredOffers = aRequired; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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122 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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123 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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124 public boolean isDeleter() { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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125 return false; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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126 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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127 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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128 public int offer(SearchOffer anOffer) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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129 ++theTotalOffers; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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130 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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131 if (theTotalOffers == theRequiredOffers) |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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132 return STOP; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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133 else |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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134 return TRY_AGAIN; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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135 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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136 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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137 } |