Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/ci/BitmapIndexer.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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0
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1 package org.dancres.blitz.entry.ci; |
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2 |
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3 import java.util.ArrayList; |
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4 import java.util.Iterator; |
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5 import java.util.Collection; |
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6 import java.util.HashMap; |
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7 |
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8 import java.util.logging.*; |
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9 |
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10 import org.dancres.blitz.entry.EntrySleeve; |
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11 import org.dancres.blitz.entry.TupleLocator; |
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12 |
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13 import org.dancres.blitz.mangler.MangledField; |
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14 import org.dancres.blitz.mangler.MangledEntry; |
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15 |
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16 import org.dancres.blitz.cache.Cache; |
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17 import org.dancres.blitz.cache.CacheListener; |
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18 import org.dancres.blitz.cache.Identifiable; |
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19 |
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20 import org.dancres.blitz.oid.OID; |
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21 |
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22 import org.dancres.blitz.Logging; |
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23 |
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24 import org.dancres.struct.BitIndex; |
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25 import org.dancres.struct.BitListener; |
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26 |
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27 /** |
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28 CacheIndexer is responsible for indexing EntrySleeves held in any |
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29 cache capable of support CacheListener instances. It supports searching |
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30 as per other forms of storage via a TupleLocator::find mechanism. |
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31 |
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32 @todo Maybe use some other kind of list rather than ArrayList which, for |
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33 large sizes, may not be so good. |
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34 */ |
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35 public class BitmapIndexer extends CacheIndexer implements CacheListener { |
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36 |
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37 private BitIndex theFreeSlots; |
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38 |
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39 /** |
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40 Because fields are ordered and always present, even if they are null |
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41 we don't need to use a HashMap here. |
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42 */ |
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43 private BitCacheLines[] theCacheLines; |
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44 |
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45 /** |
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46 Contains all ids we know about which is required for a wildcard |
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47 search. A possibly better solution would iterate across all indexes but |
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48 then there's the need to do intersection to prevent repeated passes over |
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49 the same id which means much more complex code and might perform worse |
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50 than this simple solution. |
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51 */ |
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52 private OID[] theAllIDs; |
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53 |
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54 /** |
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55 Given an ID, will tell you where the ID is indexed to if present |
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56 */ |
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57 private HashMap theOffsets = new HashMap(); |
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58 |
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59 private String theType; |
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60 |
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61 BitmapIndexer(Cache aCache, String aType) { |
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62 aCache.add(this); |
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63 theType = aType; |
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64 theFreeSlots = new BitIndex(aCache.getSize()); |
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65 /* |
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66 for (int i = 0; i < aCache.getSize(); i++) { |
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67 theFreeSlots.set(i); |
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68 } |
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69 */ |
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70 |
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71 theAllIDs = new OID[aCache.getSize()]; |
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72 } |
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73 |
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74 public void loaded(Identifiable anIdentifiable) { |
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75 // System.err.println("CI:Loaded: " + anIdentifiable.getId() + "," + this); |
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76 |
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77 EntrySleeve mySleeve = (EntrySleeve) anIdentifiable; |
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78 |
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79 /* |
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80 No point indexing something that's already deleted - we only want |
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81 to generate load requests in response to explicit address'ing via |
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82 UID. |
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83 */ |
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84 if (mySleeve.isDeleted()) |
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85 return; |
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86 |
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87 initBarrier(mySleeve); |
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88 |
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89 insert(mySleeve); |
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90 } |
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91 |
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92 public void flushed(Identifiable anIdentifiable) { |
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93 // System.err.println("CI:Flushed: " + anIdentifiable.getId() + "," + this); |
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94 |
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95 EntrySleeve mySleeve = (EntrySleeve) anIdentifiable; |
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96 initBarrier(mySleeve); |
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97 |
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98 remove(mySleeve); |
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99 } |
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100 |
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101 public void dirtied(Identifiable anIdentifiable) { |
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102 // System.err.println("CI:Dirtied: " + anIdentifiable.getId() + "," + this); |
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103 |
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104 EntrySleeve mySleeve = (EntrySleeve) anIdentifiable; |
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105 initBarrier(mySleeve); |
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106 |
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107 if (mySleeve.isDeleted()) { |
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108 // System.err.println("CI:Removed: " + anIdentifiable.getId() + ", " + this); |
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109 remove(mySleeve); |
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110 } |
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111 } |
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112 |
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113 public TupleLocator find(MangledEntry anEntry) { |
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114 try { |
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115 return findImpl(anEntry); |
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116 } catch (ArrayIndexOutOfBoundsException anE) { |
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117 theLogger.log(Level.SEVERE, "Find broke - did you add/remove fields in your Entry?", anE); |
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118 theLogger.log(Level.SEVERE, "CacheIndexer for: " + |
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119 theType); |
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120 theLogger.log(Level.SEVERE, "Entry looks like"); |
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121 theLogger.log(Level.SEVERE, "Entry type: " + |
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122 anEntry.getType()); |
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123 for (int i = 0; i < anEntry.getFields().length; i++) { |
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124 MangledField myField = anEntry.getField(i); |
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125 |
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126 theLogger.log(Level.SEVERE, "Name: " + |
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127 myField.getName() + ", hashcode:" + |
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128 myField.hashCode() + ", offset:" + |
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129 i + ", isNull: " + |
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130 myField.isNull()); |
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131 } |
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132 theLogger.log(Level.SEVERE, "Cachelines looks like"); |
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133 theLogger.log(Level.SEVERE, "Cachelines size:" + |
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134 theCacheLines.length); |
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135 for (int i = 0; i < theCacheLines.length; i++) { |
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136 theLogger.log(Level.SEVERE, "Name: " + |
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137 theCacheLines[i].getName() + |
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138 " Offset: " + i + |
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139 " size: " + |
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140 theCacheLines[i].getSize()); |
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141 } |
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142 |
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143 throw anE; |
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144 } |
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145 } |
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146 |
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147 private TupleLocator findImpl(MangledEntry anEntry) { |
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148 /* |
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149 Unlike the cache listener methods which can only be called with |
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150 an entry of this indexers type, there's a possibility this method's |
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151 first entry will be a different type. If it is, it can't be used |
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152 to init the barrier - thus, if we fail to init the barrier we should |
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153 return an empty locator |
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154 */ |
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155 if (!initBarrier(anEntry)) |
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156 return ArrayLocatorImpl.EMPTY_LOCATOR; |
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157 |
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158 if ((anEntry == null) || (anEntry.isWildcard())) { |
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159 // Handle wildcard requests |
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160 // |
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161 if (theLogger.isLoggable(Level.FINE)) |
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162 theLogger.log(Level.FINE, "Wildcard match"); |
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163 |
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164 synchronized(theAllIDs) { |
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165 if (theOffsets.size() == 0) { |
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166 // System.err.println("No matches"); |
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167 return ArrayLocatorImpl.EMPTY_LOCATOR; |
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168 } else { |
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169 // System.err.println("Sparse"); |
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170 /* |
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171 OID[] myUids = new OID[theAllIDs.length]; |
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172 System.arraycopy(theAllIDs, 0, myUids, 0, |
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173 theAllIDs.length); |
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174 */ |
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175 return new BitLocatorImpl(theFreeSlots, theAllIDs, |
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176 false); |
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177 } |
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178 } |
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179 } else { |
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180 // Proper indexing effort |
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181 // |
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182 if (theLogger.isLoggable(Level.FINE)) |
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183 theLogger.log(Level.FINE, "Specific match"); |
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184 |
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185 MangledField myChoice = null; |
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186 int myChoicesSize = 0; |
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187 int myChoicesOffset = 0; |
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188 |
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189 // Find the smallest index available |
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190 for (int i = 0; i < anEntry.getFields().length; i++) { |
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191 MangledField myField = anEntry.getField(i); |
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192 int mySize; |
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193 |
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194 if (theLogger.isLoggable(Level.FINE)) |
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195 theLogger.log(Level.FINE, "Consider: " + myField.getName()); |
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196 |
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197 // If field is empty, we can't search on it |
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198 if (myField.isNull()) |
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199 continue; |
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200 |
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201 mySize = getSize(myField, i); |
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202 |
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203 /* |
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204 Field is searchable - but, if we get no hits from cache |
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205 indexes, that means we have no matches in memory. This |
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206 works because for a match to succeed it must match on |
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207 all fields in the template. Thus if the template has a |
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208 field with a hashcode that produces no hits then whilst |
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209 we may have Entry's that match other fields of the template |
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210 we know that none of these Entry's will match this field |
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211 of the template so we should stop now. |
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212 */ |
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213 if (mySize == 0) { |
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214 if (theLogger.isLoggable(Level.FINE)) |
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215 theLogger.log(Level.FINE, |
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216 "One key not indexed - abort"); |
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217 return ArrayLocatorImpl.EMPTY_LOCATOR; |
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218 } |
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219 |
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220 if (theLogger.isLoggable(Level.FINE)) |
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221 theLogger.log(Level.FINE, "Available size: " + mySize); |
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222 |
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223 if (myChoice == null) { |
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224 myChoice = myField; |
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225 myChoicesSize = mySize; |
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226 myChoicesOffset = i; |
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227 } else { |
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228 if (mySize < myChoicesSize) { |
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229 myChoice = myField; |
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230 myChoicesSize = mySize; |
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231 myChoicesOffset = i; |
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232 } |
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233 } |
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234 } |
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235 |
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236 if (myChoice == null) { |
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237 return ArrayLocatorImpl.EMPTY_LOCATOR; |
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238 } else { |
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239 if (theLogger.isLoggable(Level.FINE)) |
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240 theLogger.log(Level.FINE, "Chose: " + myChoicesSize + |
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241 myChoice.getName()); |
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242 return getIds(myChoice, myChoicesOffset); |
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243 } |
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244 } |
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245 } |
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246 |
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247 private TupleLocator getIds(MangledField aField, int anOffset) { |
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248 BitCacheLines myLine = getCacheLines(anOffset); |
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249 BitIndex myIndex = myLine.getHits(aField.hashCode()); |
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250 |
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251 if (myIndex == null) |
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252 return ArrayLocatorImpl.EMPTY_LOCATOR; |
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253 else { |
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254 /* |
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255 synchronized(theAllIDs) { |
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256 OID[] myUids = new OID[theAllIDs.length]; |
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257 System.arraycopy(theAllIDs, 0, myUids, 0, theAllIDs.length); |
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258 } |
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259 */ |
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260 return new BitLocatorImpl(myIndex, theAllIDs, false); |
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261 } |
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262 } |
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263 |
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264 private int getSize(MangledField aField, int anOffset) { |
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265 BitCacheLines myLine = getCacheLines(anOffset); |
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266 return myLine.getSize(aField.hashCode()); |
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267 } |
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268 |
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269 private boolean initBarrier(EntrySleeve aSleeve) { |
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270 synchronized(this) { |
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271 if (theCacheLines == null) |
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272 return initBarrier(aSleeve.getEntry()); |
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273 else |
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274 return true; |
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275 } |
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276 } |
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277 |
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278 /** |
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279 @return true if the barrier is already inited or if |
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280 the barrier was successfully inited, false otherwise. |
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281 */ |
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282 private boolean initBarrier(MangledEntry anEntry) { |
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283 synchronized(this) { |
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284 if (theCacheLines == null) { |
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285 theLogger.log(Level.FINE, |
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286 "Initing cache indexer: " + theType); |
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287 |
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288 if (!anEntry.getType().equals(theType)) { |
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289 theLogger.log(Level.FINE, |
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290 "Can't init indexer with this: " + |
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291 anEntry.getType()); |
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292 return false; |
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293 } |
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294 |
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295 theLogger.log(Level.FINE, "Entry looks like"); |
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296 theLogger.log(Level.FINE, "Entry type: " + |
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297 anEntry.getType()); |
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298 for (int i = 0; i < anEntry.getFields().length; i++) { |
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299 MangledField myField = anEntry.getField(i); |
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300 |
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301 theLogger.log(Level.FINE, "Name: " + |
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302 myField.getName() + ", hashcode:" + |
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303 myField.hashCode() + ", offset:" + |
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304 i + ", isNull: " + |
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305 myField.isNull()); |
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306 } |
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307 |
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308 MangledField[] myFields = anEntry.getFields(); |
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309 theCacheLines = new BitCacheLines[myFields.length]; |
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310 |
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311 for (int i = 0; i < myFields.length; i++) { |
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312 theCacheLines[i] = new BitCacheLines(i, |
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313 myFields[i].getName(), |
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314 theAllIDs.length); |
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315 } |
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316 } |
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317 |
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318 return true; |
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319 } |
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320 } |
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321 |
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322 private BitCacheLines getCacheLines(int anOffset) { |
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323 return theCacheLines[anOffset]; |
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324 } |
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325 |
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326 private static final class FreeSlotReceiver implements BitListener { |
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327 private int theFree; |
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328 |
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329 public boolean active(int aPos) { |
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330 throw new RuntimeException("Shouldn't have been called"); |
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331 } |
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332 |
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333 public boolean inactive(int aPos) { |
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334 theFree = aPos; |
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335 return true; |
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336 } |
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337 |
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338 int getIndex() { |
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339 return theFree; |
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340 } |
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341 } |
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342 |
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343 /** |
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344 Store the id of the passed sleeve into a free slot and return the slot |
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345 assigned. |
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346 */ |
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347 private int assignSlot(EntrySleeve aSleeve) { |
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348 // Find slot |
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349 FreeSlotReceiver myFreeSlot = new FreeSlotReceiver(); |
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350 theFreeSlots.iterateZero(myFreeSlot); |
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351 |
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352 // Populate |
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353 theFreeSlots.set(myFreeSlot.getIndex()); |
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354 theAllIDs[myFreeSlot.getIndex()] = aSleeve.getOID(); |
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355 theOffsets.put(aSleeve.getOID(), new Integer(myFreeSlot.getIndex())); |
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356 |
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357 /* |
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358 System.out.println("Inserting: " + aSleeve.getOID() + " at " + |
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359 myFreeSlot.getIndex()); |
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360 */ |
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361 return myFreeSlot.getIndex(); |
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362 } |
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363 |
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364 /** |
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365 Locate the id of the passed sleeve and remove it from it's slot |
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366 return the index of the slot it was in |
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367 |
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368 @return -1 if the id was not present |
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369 */ |
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370 private int freeSlot(EntrySleeve aSleeve) { |
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371 Integer myKey = (Integer) theOffsets.remove(aSleeve.getOID()); |
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372 |
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373 if (myKey == null) |
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374 return -1; |
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375 else { |
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376 /* |
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377 System.out.println("Removing: " + aSleeve.getOID() + " at " + |
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378 myKey); |
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379 */ |
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380 } |
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381 |
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382 int mySlot = myKey.intValue(); |
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383 theFreeSlots.clear(mySlot); |
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384 theAllIDs[mySlot] = null; |
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385 |
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386 return mySlot; |
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387 } |
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388 |
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389 /** |
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390 Add a sleeve to the indexer |
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391 */ |
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392 private void insert(EntrySleeve aSleeve) { |
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393 int mySlot; |
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394 |
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395 synchronized(theAllIDs) { |
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396 mySlot = assignSlot(aSleeve); |
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397 |
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398 for (int i = 0; i < theCacheLines.length; i++) { |
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399 theCacheLines[i].insert(aSleeve, mySlot); |
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400 } |
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401 } |
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402 } |
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403 |
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404 /** |
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405 Remove a sleeve from the indexer |
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406 */ |
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407 private void remove(EntrySleeve aSleeve) { |
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408 int mySlot; |
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409 |
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410 synchronized(theAllIDs) { |
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411 mySlot = freeSlot(aSleeve); |
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412 |
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413 if (mySlot != -1) { |
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414 // System.out.println("CI:Did remove: " + aSleeve.getOID()); |
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415 for (int i = 0; i < theCacheLines.length; i++) { |
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416 theCacheLines[i].remove(aSleeve, mySlot); |
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417 } |
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418 } else { |
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419 // System.out.println("CI:Not removed: " + aSleeve.getOID()); |
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420 } |
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421 } |
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422 } |
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423 } |