Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/entry/ci/CacheIndexerImpl.java @ 29:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +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.Set; |
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4 |
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5 import java.util.logging.*; |
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6 |
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7 import org.dancres.blitz.entry.EntrySleeve; |
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8 import org.dancres.blitz.entry.TupleLocator; |
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9 |
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10 import org.dancres.blitz.mangler.MangledField; |
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11 import org.dancres.blitz.mangler.MangledEntry; |
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12 |
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13 import org.dancres.blitz.cache.Identifiable; |
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14 |
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15 import org.dancres.blitz.oid.OID; |
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16 |
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17 /** |
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18 * A skeleton implementation of a cache indexer. |
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19 * Requires that the underlying index mechanism can support the CacheLines interface. |
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20 * |
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21 * @see org.dancres.blitz.entry.ci.CacheLines |
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22 * |
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23 */ |
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24 public abstract class CacheIndexerImpl extends CacheIndexer { |
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25 |
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26 /** |
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27 Because fields are ordered and always present, even if they are null |
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28 we don't need to use a HashMap here. |
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29 */ |
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30 private CacheLines[] theCacheLines; |
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31 |
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32 /** |
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33 Contains all ids we know about which is required for a wildcard |
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34 search. A possibly better solution would iterate across all indexes but |
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35 then there's the need to do intersection to prevent repeated passes over |
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36 the same id which means much more complex code and might perform worse |
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37 than this simple solution. |
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38 */ |
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39 private Set theAllIds; |
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40 |
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41 private String theType; |
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42 |
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43 CacheIndexerImpl(String aType) { |
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44 theType = aType; |
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45 theAllIds = newIds(); |
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46 } |
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47 |
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48 abstract Set newIds(); |
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49 |
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50 public void loaded(Identifiable anIdentifiable) { |
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51 // System.err.println("CI:Loaded: " + anIdentifiable.getId() + "," + this); |
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52 |
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53 EntrySleeve mySleeve = (EntrySleeve) anIdentifiable; |
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54 |
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55 /* |
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56 No point indexing something that's already deleted - we only want |
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57 to generate load requests in response to explicit address'ing via |
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58 UID. |
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59 */ |
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60 if (mySleeve.isDeleted()) |
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61 return; |
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62 |
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63 initBarrier(mySleeve); |
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64 |
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65 insert(mySleeve); |
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66 } |
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67 |
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68 public void flushed(Identifiable anIdentifiable) { |
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69 // System.err.println("CI:Flushed: " + anIdentifiable.getId() + "," + this); |
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70 |
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71 EntrySleeve mySleeve = (EntrySleeve) anIdentifiable; |
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72 initBarrier(mySleeve); |
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73 |
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74 remove(mySleeve); |
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75 } |
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76 |
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77 public void dirtied(Identifiable anIdentifiable) { |
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78 // System.err.println("CI:Dirtied: " + anIdentifiable.getId() + "," + this); |
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79 |
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80 EntrySleeve mySleeve = (EntrySleeve) anIdentifiable; |
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81 initBarrier(mySleeve); |
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82 |
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83 if (mySleeve.isDeleted()) |
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84 remove(mySleeve); |
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85 } |
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86 |
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87 public TupleLocator find(MangledEntry anEntry) { |
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88 try { |
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89 return findImpl(anEntry); |
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90 } catch (ArrayIndexOutOfBoundsException anE) { |
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91 theLogger.log(Level.SEVERE, "Find broke - did you add/remove fields in your Entry?", anE); |
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92 theLogger.log(Level.SEVERE, "CacheIndexer for: " + |
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93 theType); |
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94 theLogger.log(Level.SEVERE, "Entry looks like"); |
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95 theLogger.log(Level.SEVERE, "Entry type: " + |
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96 anEntry.getType()); |
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97 for (int i = 0; i < anEntry.getFields().length; i++) { |
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98 MangledField myField = anEntry.getField(i); |
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99 |
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100 theLogger.log(Level.SEVERE, "Name: " + |
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101 myField.getName() + ", hashcode:" + |
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102 myField.hashCode() + ", offset:" + |
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103 i + ", isNull: " + |
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104 myField.isNull()); |
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105 } |
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106 theLogger.log(Level.SEVERE, "Cachelines looks like"); |
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107 theLogger.log(Level.SEVERE, "Cachelines size:" + |
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108 theCacheLines.length); |
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109 for (int i = 0; i < theCacheLines.length; i++) { |
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110 theLogger.log(Level.SEVERE, "Name: " + |
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111 theCacheLines[i].getName() + |
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112 " Offset: " + i + |
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113 " size: " + |
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114 theCacheLines[i].getSize()); |
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115 } |
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116 |
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117 throw anE; |
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118 } |
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119 } |
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120 |
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121 private TupleLocator findImpl(MangledEntry anEntry) { |
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122 /* |
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123 Unlike the cache listener methods which can only be called with |
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124 an entry of this indexers type, there's a possibility this method's |
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125 first entry will be a different type. If it is, it can't be used |
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126 to init the barrier - thus, if we fail to init the barrier we should |
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127 return an empty locator |
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128 */ |
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129 if (!initBarrier(anEntry)) |
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130 return ArrayLocatorImpl.EMPTY_LOCATOR; |
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131 |
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132 if ((anEntry == null) || (anEntry.isWildcard())) { |
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133 // Handle wildcard requests |
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134 // |
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135 if (theLogger.isLoggable(Level.FINE)) |
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136 theLogger.log(Level.FINE, "Wildcard match"); |
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137 |
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138 synchronized(theAllIds) { |
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139 if (theAllIds.size() == 0) |
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140 return ArrayLocatorImpl.EMPTY_LOCATOR; |
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141 else { |
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142 OID[] myUids = new OID[theAllIds.size()]; |
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143 myUids = (OID[]) theAllIds.toArray(myUids); |
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144 |
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145 return new ArrayLocatorImpl(myUids); |
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146 } |
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147 } |
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148 } else { |
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149 // Proper indexing effort |
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150 // |
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151 if (theLogger.isLoggable(Level.FINE)) |
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152 theLogger.log(Level.FINE, "Specific match"); |
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153 |
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154 MangledField myChoice = null; |
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155 int myChoicesSize = 0; |
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156 int myChoicesOffset = 0; |
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157 |
29
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158 if ((anEntry.getType().equals(theType)) && |
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159 (anEntry.getFields().length != theCacheLines.length)) |
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160 theLogger.log(Level.WARNING, "Possible schema change detected - matching may fail" + theType); |
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161 |
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162 // Find the smallest index available |
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163 for (int i = 0; i < anEntry.getFields().length; i++) { |
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164 MangledField myField = anEntry.getField(i); |
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165 int mySize; |
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166 |
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167 if (theLogger.isLoggable(Level.FINE)) |
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168 theLogger.log(Level.FINE, "Consider: " + myField.getName()); |
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169 |
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170 // If field is empty, we can't search on it |
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171 if (myField.isNull()) |
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172 continue; |
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173 |
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174 mySize = getSize(myField, i); |
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175 |
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176 /* |
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177 Field is searchable - but, if we get no hits from cache |
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178 indexes, that means we have no matches in memory. This |
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179 works because for a match to succeed it must match on |
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180 all fields in the template. Thus if the template has a |
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181 field with a hashcode that produces no hits then whilst |
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182 we may have Entry's that match other fields of the template |
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183 we know that none of these Entry's will match this field |
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184 of the template so we should stop now. |
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185 */ |
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186 if (mySize == 0) { |
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187 if (theLogger.isLoggable(Level.FINE)) |
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188 theLogger.log(Level.FINE, |
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189 "One key not indexed - abort"); |
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190 return ArrayLocatorImpl.EMPTY_LOCATOR; |
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191 } |
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192 |
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193 if (theLogger.isLoggable(Level.FINE)) |
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194 theLogger.log(Level.FINE, "Available size: " + mySize); |
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195 |
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196 if (myChoice == null) { |
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197 myChoice = myField; |
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198 myChoicesSize = mySize; |
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199 myChoicesOffset = i; |
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200 } else { |
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201 if (mySize < myChoicesSize) { |
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202 myChoice = myField; |
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203 myChoicesSize = mySize; |
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204 myChoicesOffset = i; |
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205 } |
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206 } |
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207 } |
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208 |
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209 if (myChoice == null) { |
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210 return ArrayLocatorImpl.EMPTY_LOCATOR; |
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211 } else { |
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212 if (theLogger.isLoggable(Level.FINE)) |
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213 theLogger.log(Level.FINE, "Chose: " + myChoicesSize + |
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214 myChoice.getName()); |
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215 return getIds(myChoice, myChoicesOffset); |
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216 } |
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217 } |
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218 } |
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219 |
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220 private TupleLocator getIds(MangledField aField, int anOffset) { |
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221 CacheLines myLine = getCacheLines(anOffset); |
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222 return myLine.getIds(aField.hashCode()); |
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223 } |
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224 |
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225 private int getSize(MangledField aField, int anOffset) { |
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226 CacheLines myLine = getCacheLines(anOffset); |
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227 return myLine.getSize(aField.hashCode()); |
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228 } |
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229 |
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230 private boolean initBarrier(EntrySleeve aSleeve) { |
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231 synchronized(this) { |
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232 if (theCacheLines == null) |
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233 return initBarrier(aSleeve.getEntry()); |
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234 else |
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235 return true; |
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236 } |
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237 } |
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238 |
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239 /** |
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240 @return true if the barrier is already inited or if |
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241 the barrier was successfully inited, false otherwise. |
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242 */ |
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243 private boolean initBarrier(MangledEntry anEntry) { |
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244 synchronized(this) { |
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245 if (theCacheLines == null) { |
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246 theLogger.log(Level.FINE, |
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247 "Initing cache indexer: " + theType); |
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248 |
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249 if (!anEntry.getType().equals(theType)) { |
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250 theLogger.log(Level.FINE, |
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251 "Can't init indexer with this: " + |
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252 anEntry.getType()); |
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253 return false; |
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254 } |
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255 |
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256 theLogger.log(Level.FINE, "Entry looks like"); |
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257 theLogger.log(Level.FINE, "Entry type: " + |
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258 anEntry.getType()); |
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259 for (int i = 0; i < anEntry.getFields().length; i++) { |
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260 MangledField myField = anEntry.getField(i); |
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261 |
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262 theLogger.log(Level.FINE, "Name: " + |
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263 myField.getName() + ", hashcode:" + |
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264 myField.hashCode() + ", offset:" + |
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265 i + ", isNull: " + |
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266 myField.isNull()); |
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267 } |
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268 |
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269 MangledField[] myFields = anEntry.getFields(); |
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270 theCacheLines = newLinesArray(myFields.length); |
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271 |
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272 for (int i = 0; i < myFields.length; i++) { |
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273 theCacheLines[i] = newLines(i, myFields[i].getName()); |
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274 } |
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275 } |
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276 |
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277 return true; |
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278 } |
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279 } |
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280 |
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281 abstract CacheLines[] newLinesArray(int aSize); |
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282 |
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283 abstract CacheLines newLines(int anIndex, String aFieldName); |
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284 |
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285 private CacheLines getCacheLines(int anOffset) { |
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286 return theCacheLines[anOffset]; |
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287 } |
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288 |
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289 /** |
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290 Add a sleeve to the indexer |
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291 */ |
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292 private void insert(EntrySleeve aSleeve) { |
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293 synchronized(theAllIds) { |
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294 |
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295 if (theAllIds.add(aSleeve.getOID())) { |
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296 for (int i = 0; i < theCacheLines.length; i++) { |
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297 theCacheLines[i].insert(aSleeve); |
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298 } |
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299 } else { |
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300 // System.err.println("Already added"); |
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301 } |
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302 } |
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303 } |
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304 |
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305 /** |
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306 Remove a sleeve from the indexer |
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307 */ |
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308 private void remove(EntrySleeve aSleeve) { |
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309 synchronized(theAllIds) { |
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310 |
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311 if (theAllIds.remove(aSleeve.getOID())) { |
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312 for (int i = 0; i < theCacheLines.length; i++) { |
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313 theCacheLines[i].remove(aSleeve); |
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314 } |
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315 /* |
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316 new RuntimeException( |
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317 "Removed: " + aSleeve.getOID()).printStackTrace( |
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318 System.err); |
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319 */ |
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320 } else { |
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321 // new RuntimeException("Already removed: " + aSleeve.getOID()).printStackTrace(System.err); |
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322 } |
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323 } |
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324 } |
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325 } |