Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/EntryReposImpl.java @ 33:0b9265358617
Added tag 2.1.1 for changeset a77f0a9ed93c
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:52:10 +0100 |
parents | 3dc0c5604566 |
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rev | line source |
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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 |
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5 import java.util.logging.*; |
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6 |
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7 import net.jini.config.ConfigurationException; |
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8 |
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9 import org.dancres.blitz.mangler.MangledField; |
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10 import org.dancres.blitz.mangler.MangledEntry; |
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11 |
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12 import org.dancres.blitz.Logging; |
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13 import org.dancres.blitz.config.EntryConstraints; |
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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 import org.dancres.blitz.arc.CacheBlockDescriptor; |
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18 import org.dancres.blitz.arc.RecoverySummary; |
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19 |
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20 import org.dancres.blitz.lease.Reapable; |
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21 import org.dancres.blitz.lease.ReapFilter; |
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22 |
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23 import org.dancres.blitz.txn.TxnManager; |
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24 |
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25 class EntryReposImpl implements EntryReposRecovery, Reapable { |
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26 private static Logger theLogger = |
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27 Logging.newLogger("org.dancres.disk.EntryRepository"); |
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28 |
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29 private Storage theStore; |
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30 private SleeveCache theSleeveCache; |
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31 |
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32 private boolean haveLoggedCount = false; |
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33 |
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34 private EntryConstraints theConstraints; |
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35 |
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36 EntryReposImpl(Storage aStore) throws IOException { |
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37 try { |
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38 theConstraints = EntryConstraints.getConstraints(aStore.getType()); |
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39 } catch (ConfigurationException aCE) { |
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40 IOException myIOE = new IOException("Couldn't load constraints"); |
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41 myIOE.initCause(aCE); |
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42 throw myIOE; |
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43 } |
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44 |
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45 theStore = aStore; |
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46 theSleeveCache = new SleeveCache(theStore); |
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47 |
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48 // Don't configure for reaping if it's configured off |
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49 if (EntryRepositoryFactory.getReaper().isActive()) |
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50 EntryRepositoryFactory.getReaper().add(this); |
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51 } |
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52 |
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53 /** |
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54 This method is designed to log a record of the number of instances of |
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55 this repository's type the first time the repository is updated. |
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56 |
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57 It's expected that checkpoints will store instance counts for all |
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58 repositories loaded at that time. This code ensures that any |
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59 repositories that come into being between checkpoints also have an |
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60 appropriate record to which following logged actions can be applied. |
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61 |
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62 We only need to log the record once because at the next checkpoint |
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63 it's counts will be in the checkpoint record. This step is the |
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64 responsibility of <code>EntryRepositoryFactory</code> |
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65 */ |
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66 private void logInstanceBarrier() { |
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67 if (TxnManager.get().isRecovery()) { |
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68 return; |
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69 } |
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70 |
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71 if (EntryRepositoryFactory.get().isDebugLogging()) { |
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72 synchronized(this) { |
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73 if (haveLoggedCount) |
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74 return; |
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75 |
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76 try { |
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77 /* |
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78 We must use the live stats for this count as the |
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79 storage's count may not be up-to-date due to actions |
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80 performed during recovery still sitting in cache. |
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81 I _think_ the fact that we checkpoint should prevent |
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82 this from actually happening but better safe than sorry. |
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83 |
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84 We only attempt to log this - we can fail due to being |
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85 blocked on the transaction log lock for too long. |
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86 If that has happened, chances are we've done a checkpoint |
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87 and a record will have been emitted anyways. |
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88 */ |
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89 TxnManager.get().tryLog(new CountAction(theStore.getType(), |
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90 theSleeveCache.getCounters().getInstanceCount()), 100); |
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91 } catch (Exception anE) { |
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92 theLogger.log(Level.SEVERE, "Failed to log instance count", |
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93 anE); |
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94 } |
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95 |
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96 haveLoggedCount = true; |
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97 } |
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98 } |
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99 } |
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100 |
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101 public String getType() { |
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102 return theStore.getName(); |
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103 } |
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104 |
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105 public int getTotalStoredEntries() throws IOException { |
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106 return theStore.getNumEntries(); |
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107 } |
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108 |
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109 public int getTotalLiveEntries() { |
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110 return theSleeveCache.getCounters().getInstanceCount(); |
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111 } |
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112 |
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113 public void reap(ReapFilter aFilter) { |
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114 logInstanceBarrier(); |
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115 |
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116 try { |
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117 theStore.bringOutTheDead(new CleanerImpl(theSleeveCache, aFilter)); |
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118 } catch (IOException anIOE) { |
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119 theLogger.log(Level.SEVERE, "Couldn't bring out the dead", |
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120 anIOE); |
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121 } |
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122 } |
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123 |
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124 public boolean renew(OID aOID, long anExpiry) throws IOException { |
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125 logInstanceBarrier(); |
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126 |
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127 return theSleeveCache.renew(aOID, anExpiry); |
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128 } |
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129 |
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130 public boolean cancel(OID aOID) throws IOException { |
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131 logInstanceBarrier(); |
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132 |
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133 return theSleeveCache.cancel(aOID); |
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134 } |
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135 |
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136 /* |
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137 These methods are only used during commit/abort and thus there will |
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138 have been activity previously generating a log entry for instance counts. |
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139 |
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140 If there hasn't been activity, this operation is coming from the log |
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141 file which means there's been activity in the previous run and so |
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142 either we have an instance count in the checkpoint record or we'll have |
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143 logged one ourselves as part of activity prior to logging the transaction |
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144 which has generated these operations. |
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145 */ |
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146 public CacheBlockDescriptor load(OID aOID) throws IOException { |
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147 return theSleeveCache.load(aOID); |
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148 } |
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149 |
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150 public void flush(CacheBlockDescriptor aCBD) throws IOException { |
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151 theSleeveCache.forceSync(aCBD); |
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152 } |
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153 |
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154 CacheBlockDescriptor add(EntrySleeveImpl aSleeve) throws IOException { |
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155 return theSleeveCache.add(aSleeve); |
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156 } |
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157 |
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158 public RecoverySummary recover(EntrySleeveImpl aSleeve) |
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159 throws IOException { |
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160 return theSleeveCache.recover(aSleeve); |
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161 } |
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162 |
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163 public Counters getCounters() { |
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164 return theSleeveCache.getCounters(); |
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165 } |
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166 |
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167 /* |
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168 These methods indicate new activity and we want to make sure we have |
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169 an up-to-date instance count |
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170 */ |
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171 public void write(MangledEntry anEntry, long anExpiry, |
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172 WriteEscort anEscort) |
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173 throws IOException { |
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174 logInstanceBarrier(); |
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175 theSleeveCache.write(anEntry, anExpiry, anEscort); |
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176 } |
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177 |
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178 public void find(MangledEntry aTemplate, SearchVisitor aVisitor) |
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179 throws IOException { |
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180 logInstanceBarrier(); |
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181 theSleeveCache.find(aTemplate, aVisitor); |
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182 } |
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183 |
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184 public boolean find(SearchVisitor aVisitor, OID aOID, MangledEntry aPreload) |
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185 throws IOException { |
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186 logInstanceBarrier(); |
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187 return theSleeveCache.find(aVisitor, aOID, aPreload); |
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188 } |
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189 |
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190 public LongtermOffer getOffer(OID anOID) throws IOException { |
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191 logInstanceBarrier(); |
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192 return theSleeveCache.getOffer(anOID); |
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193 } |
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194 |
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195 public EntryConstraints getConstraints() { |
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196 return theConstraints; |
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197 } |
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198 |
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199 public void setFields(MangledField[] aListOfFields) |
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200 throws IOException { |
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201 theStore.setFields(aListOfFields); |
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202 } |
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203 |
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204 public boolean noSchemaDefined() { |
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205 return theStore.noSchemaDefined(); |
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206 } |
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207 |
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208 public void addSubtype(String aType) throws IOException { |
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209 theStore.addSubtype(aType); |
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210 } |
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211 |
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212 public String[] getSubtypes() { |
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213 return theStore.getSubtypes(); |
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214 } |
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215 |
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216 void deleteAllEntrys() throws IOException { |
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217 theSleeveCache.deleteAll(); |
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218 } |
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219 |
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220 void delete() throws IOException { |
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221 theStore.delete(); |
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222 } |
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223 |
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224 void sync() throws IOException { |
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225 theLogger.log(Level.FINE, "Syncing to disk: " + theStore.getType()); |
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226 // System.err.println("Syncing to disk: " + theStore.getType()); |
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227 theSleeveCache.sync(); |
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228 } |
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229 |
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230 void close() throws IOException { |
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231 theLogger.log(Level.FINE, "Closing: " + theStore.getType()); |
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232 // System.err.println("Closing: " + theStore.getType()); |
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233 theSleeveCache.close(); |
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234 theStore.close(); |
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235 } |
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236 |
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237 public String toString() { |
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238 return "EntryReposImpl: " + theStore.getType() + ", " |
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239 + theStore.getClass(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
240 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
241 } |