Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/RootStorage.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 java.io.IOException; |
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4 import java.io.FileNotFoundException; |
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5 |
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6 import java.util.logging.*; |
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7 |
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8 import java.util.ArrayList; |
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9 import org.dancres.blitz.entry.ci.CacheIndexer; |
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10 |
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11 import org.dancres.blitz.mangler.MangledField; |
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12 import org.dancres.blitz.mangler.MangledEntry; |
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13 |
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14 import org.dancres.util.BytePacker; |
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15 |
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16 import org.dancres.blitz.Logging; |
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17 import org.dancres.blitz.config.EntryConstraints; |
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18 |
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19 import org.dancres.util.ObjectTransformer; |
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20 |
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21 import org.dancres.blitz.meta.RegistryFactory; |
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22 import org.dancres.blitz.meta.Registry; |
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23 |
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24 import org.dancres.blitz.disk.DiskTxn; |
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25 import org.dancres.blitz.disk.Disk; |
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26 |
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27 import org.dancres.blitz.oid.Allocator; |
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28 import org.dancres.blitz.oid.AllocatorFactory; |
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29 import org.dancres.blitz.oid.OID; |
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30 |
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31 import org.dancres.blitz.arc.BackingStore; |
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32 |
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33 import org.dancres.blitz.cache.Identifiable; |
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34 import org.dancres.blitz.cache.Identifier; |
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35 import org.dancres.blitz.cache.CacheListener; |
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36 |
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37 import org.dancres.blitz.lease.ReapFilter; |
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38 |
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39 import org.dancres.blitz.stats.TypesStat; |
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40 import org.dancres.blitz.stats.StatsBoard; |
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41 |
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42 /** |
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43 <p>Handles all responsibilities associated with the root Entry type |
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44 "java.lang.Object". This is an internal implementation detail. We |
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45 maintain a repository of java.lang.Object for the purposes of tracking |
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46 subtype information which is used when the JavaSpaces programmer invokes a |
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47 <code>take</code> or <code>read</code> on the proxy with a |
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48 <code>null</code> template. The <code>null</argument>, of course, means |
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49 find an entry of any type.</p> |
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50 |
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51 Storage of concrete instances of Entry are handled by EntryStorage. |
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52 |
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53 @see org.dancres.blitz.entry.EntryStorage |
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54 */ |
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55 class RootStorage implements Storage { |
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56 private String theType; |
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57 |
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58 /** |
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59 Required because we still store type information |
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60 */ |
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61 private Registry theMetaData; |
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62 |
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63 private ArrayList theSubtypes = new ArrayList(); |
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64 private String[] theCurrentSubtypes = new String[0]; |
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65 |
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66 private boolean noSchemaDefined = false; |
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67 |
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68 private TypesStat theTypesStat; |
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69 |
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70 private EntryConstraints theConstraints = EntryConstraints.MINIMUM; |
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71 |
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72 RootStorage() { |
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73 theType = EntryRepository.ROOT_TYPE; |
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74 CacheIndexer.newIndexer(theType, theConstraints); |
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75 } |
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76 |
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77 public int getNumEntries() throws IOException { |
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78 return 0; |
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79 } |
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80 |
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81 public EntryConstraints getConstraints() { |
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82 return theConstraints; |
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83 } |
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84 |
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85 void add(CacheListener aListener) { |
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86 } |
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87 |
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88 public String getType() { |
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89 return theType; |
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90 } |
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91 |
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92 public String getName() { |
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93 return theType; |
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94 } |
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95 |
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96 public TupleLocator findCached(MangledEntry anEntry) { |
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97 return null; |
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98 } |
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99 |
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100 /** |
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101 @return <code>true</code> if initialization succeeded in accordance |
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102 with the mustExist flag. i.e. If mustExist is true and the databases |
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103 couldn't be opened one will receive <code>false</code> NOT an |
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104 exception. |
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105 */ |
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106 public boolean init(boolean mustExist) throws IOException { |
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107 if (mustExist) { |
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108 if (! RegistryFactory.exists(theType)) |
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109 return false; |
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110 } |
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111 |
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112 try { |
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113 theMetaData = RegistryFactory.get(theType, null); |
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114 |
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115 DiskTxn myTxn = DiskTxn.newStandalone(); |
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116 |
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117 try { |
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118 byte[] mySubtypeInfo = |
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119 theMetaData.getAccessor(myTxn).loadRaw(FixedOIDs.SUBTYPES_KEY); |
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120 |
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121 if (mySubtypeInfo != null) { |
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122 theSubtypes =(ArrayList) |
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123 ObjectTransformer.toObject(mySubtypeInfo); |
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124 updateCurrentTypes(); |
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125 } |
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126 } finally { |
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127 myTxn.commit(); |
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128 } |
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129 |
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130 } catch (FileNotFoundException aFNFE) { |
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131 EntryStorage.theLogger.log(Level.SEVERE, |
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132 "Couldn't open type db", aFNFE); |
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133 throw new IOException("Couldn't open type db"); |
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134 } |
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135 |
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136 return true; |
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137 } |
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138 |
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139 /** |
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140 Tells this Repository about a subtype which has just been created |
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141 and would need to be search if this type were the specified template. |
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142 */ |
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143 public synchronized void addSubtype(String aType) throws IOException { |
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144 if (! theSubtypes.contains(aType)) { |
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145 theSubtypes.add(aType); |
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146 updateCurrentTypes(); |
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147 theMetaData.getAccessor().save(FixedOIDs.SUBTYPES_KEY, |
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148 theSubtypes); |
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149 } |
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150 } |
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151 |
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152 public synchronized String[] getSubtypes() { |
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153 return theCurrentSubtypes; |
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154 } |
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155 |
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156 /** |
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157 Called to setup schema information, create indexes etc - should only |
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158 be called once in response to <code>true</code> being returned from |
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159 <code>didntExist()</code> |
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160 */ |
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161 public synchronized void setFields(MangledField[] aSetOfFields) |
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162 throws IOException { |
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163 throw new RuntimeException("Shouldn't ever be called - noSchemaDefined is always false!"); |
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164 } |
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165 |
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166 /** |
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167 Indicates if we were created for the first time as the result of |
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168 a call to <code>EntryRepositoryFactory.get()</code>. Note that this |
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169 flag is reset after <code>setFields()</code> is called. Thus, even |
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170 if an EntryRepository has been informed of children, it will still |
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171 return <code>true</code> until <code>setFields</code> is called. |
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172 */ |
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173 public boolean noSchemaDefined() { |
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174 return noSchemaDefined; |
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175 } |
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176 |
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177 public void close() throws IOException { |
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178 theMetaData.close(); |
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179 } |
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180 |
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181 public OID getNextId() throws IOException { |
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182 throw new IOException("Shouldn't be called"); |
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183 } |
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184 |
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185 public void delete() throws IOException { |
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186 RegistryFactory.delete(theType); |
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187 } |
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188 |
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189 public void bringOutTheDead(EntryReaper aReaper) throws IOException { |
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190 return; |
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191 } |
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192 |
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193 private synchronized void updateCurrentTypes() { |
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194 if (theTypesStat == null) { |
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195 theTypesStat = new TypesStat(); |
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196 StatsBoard.get().add(theTypesStat); |
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197 } |
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198 |
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199 String[] myTypes = new String[theSubtypes.size()]; |
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200 theCurrentSubtypes = (String[]) theSubtypes.toArray(myTypes); |
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201 |
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202 theTypesStat.setTypes(theCurrentSubtypes); |
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203 } |
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204 |
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205 private KeyIndex newIndex(String aName, int anOffset) throws IOException { |
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206 throw new IOException("Shouldn't be called"); |
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207 } |
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208 |
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209 private void loadIndexes(byte[] aSetOfIndexes) |
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210 throws IOException { |
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211 } |
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212 |
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213 /* ******************************************************************* |
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214 * BackingStore impl |
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215 * *******************************************************************/ |
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216 |
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217 public void save(Identifiable anIdentifiable) throws IOException { |
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218 throw new IOException("Shouldn't be called"); |
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219 } |
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220 |
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221 public Identifiable load(Identifier anId) throws IOException { |
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222 throw new IOException("Shouldn't be called"); |
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223 } |
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224 |
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225 /* ********************************************************************* |
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226 Search code starts here |
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227 *********************************************************************/ |
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228 |
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229 /** |
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230 Return a set of potential matches based on the passed template. Note |
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231 one must test each returned tuple for an exact match across ALL keys |
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232 because this method is "speculative". It will return likely matches |
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233 it does not guarentee to have located an exact subset based on the |
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234 passed template. As a full match is necessary to avoid hash-collisions |
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235 this shouldn't be a problem. |
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236 |
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237 @param anEntry a template to use to locate matches. |
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238 |
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239 @return TupleLocator instance of <code>null</code> if there are no |
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240 possible matches. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
241 */ |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
242 public TupleLocator find(MangledEntry anEntry) throws IOException { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
243 return null; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
244 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
245 } |