Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/WriteBuffer.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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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.TreeMap; |
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6 import java.util.ArrayList; |
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7 import java.util.Map; |
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8 import java.util.HashMap; |
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9 |
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10 import java.util.logging.Level; |
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11 |
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12 import EDU.oswego.cs.dl.util.concurrent.Mutex; |
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13 |
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14 import org.dancres.blitz.oid.OID; |
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15 |
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16 import org.dancres.blitz.disk.WriteDaemon; |
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17 |
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18 import org.dancres.blitz.stats.StatsBoard; |
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19 import org.dancres.blitz.stats.StatGenerator; |
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20 import org.dancres.blitz.stats.Stat; |
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21 import org.dancres.blitz.stats.DirtyBufferStat; |
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22 import org.dancres.blitz.entry.ci.CacheIndexer; |
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23 |
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24 /** |
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25 <p> Writes to disk from Storage are done asynchronously. With this being |
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26 the case, it's possible for SleeveCache to flush an EntrySleeveImpl in |
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27 favour of another and then reload it later with a resultant loss of accurate |
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28 state due to the fact that the write has yet to be done. </p> |
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29 |
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30 <p> WriteBuffer tracks all pending writes and ensures that "dirty" state |
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31 that has yet to reach disk is always available to SleeveCache so that |
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32 on-disk state appears to be correct. This works because we also persistently |
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33 log such changes and ensure they've been applied at recovery or an |
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34 intermediate checkpoint. </p> |
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35 |
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36 <p> It's possible that several updates for one EntrySleeveImpl will |
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37 be submitted to WriteBuffer. Rather than handle each update separately, |
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38 WriteBuffer consolidates them all into a single disk op which improves |
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39 performance and reduces latency.</p> |
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40 */ |
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41 class WriteBuffer { |
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42 private Map theJobInfo = new HashMap(); |
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43 private EntryEditor theEditor; |
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44 |
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45 WriteBuffer(EntryEditor anEditor) { |
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46 theEditor = anEditor; |
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47 StatsBoard.get().add(new DirtyBufferGenerator(theEditor.getType(), theJobInfo)); |
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48 } |
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49 |
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50 void add(EntrySleeveImpl aSleeve) throws IOException { |
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51 try { |
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52 OID myUid = aSleeve.getOID(); |
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53 |
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54 if (aSleeve.getState().test(SleeveState.PINNED)) |
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55 throw new RuntimeException("Panic, shouldn't be seeing PINNED"); |
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56 |
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57 // We must duplicate to ensure that further changes by the |
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58 // upper layer, don't pollute us. |
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59 // |
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60 WriteRequest myRequest = new WriteRequest(aSleeve.getState().get(), |
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61 aSleeve.getPersistentRep().duplicate()); |
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62 |
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63 boolean schedule = false; |
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64 |
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65 synchronized(theJobInfo) { |
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66 ArrayList myUpdates = |
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67 (ArrayList) theJobInfo.get(myUid); |
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68 |
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69 // Queue exists? |
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70 if (myUpdates == null) { |
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71 |
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72 /* |
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73 MULTI-THREAD WRITING: |
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74 |
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75 At this point, go to WriteDaemon and ask for a queue |
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76 to dispatch to. Stamp this onto the myUpdates |
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77 (which can therefore no longer be a simple ArrayList) |
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78 */ |
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79 myUpdates = new ArrayList(); |
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80 theJobInfo.put(myUid, myUpdates); |
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81 } |
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82 |
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83 synchronized(myUpdates) { |
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84 // If nothing is pending, buffer it and indicate we need |
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85 // a job scheduled. |
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86 if (myUpdates.size() == 0) { |
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87 myUpdates.add(myRequest); |
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88 schedule = true; |
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89 } else { |
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90 // Recover last update (there should be only one?) |
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91 WriteRequest myLast = (WriteRequest) |
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92 myUpdates.get(myUpdates.size() - 1); |
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93 |
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94 try { |
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95 boolean wasActive; |
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96 |
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97 myLast.lock(); |
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98 |
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99 wasActive = myLast.isActive(); |
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100 |
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101 // If the last request is not active we can merge |
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102 // without queue'ing another job. |
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103 if (!wasActive) { |
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104 myLast.merge(myRequest); |
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105 } |
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106 |
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107 myLast.unlock(); |
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108 |
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109 // Last request was active, queue a new one and |
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110 // ask for a job to be scheduled. |
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111 if (wasActive) { |
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112 myUpdates.add(myRequest); |
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113 schedule = true; |
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114 } |
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115 |
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116 } catch (InterruptedException anIE) { |
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117 EntryStorage.theLogger.log(Level.SEVERE, |
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118 "Failed to lock previous request", anIE); |
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119 } |
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120 } |
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121 } |
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122 |
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123 /* |
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124 Make sure we flip NOT_ON_DISK because we're really |
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125 writing. This might seem odd - for example, what would |
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126 happen if we had a Sleeve with NOT_ON_DISK | DELETE? |
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127 Well, because the Sleeve is DELETE, no other thread |
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128 should dirty the cache entry again. Were it to do so |
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129 if will cause a write problem but it would also be a bug. |
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130 */ |
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131 aSleeve.getState().clear(SleeveState.NOT_ON_DISK); |
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132 |
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133 if (schedule) { |
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134 Job myJob = new Job(myUid, this); |
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135 |
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136 /* |
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137 MULTI-THREAD WRITING: |
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138 |
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139 Use the queue id gathered from the list of updates |
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140 above as an argument to this method. |
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141 |
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142 In this way, we can ensure all updates for one |
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143 UID are dispatched in the same queue which ensures |
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144 FIFO ordering. |
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145 */ |
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146 WriteDaemon.get().queue(myJob); |
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147 } |
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148 } |
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149 |
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150 } catch (Exception anE) { |
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151 EntryStorage.theLogger.log(Level.SEVERE, |
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152 "Failed to add write to cache: " + |
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153 theEditor, anE); |
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154 } |
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155 } |
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156 |
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157 /** |
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158 @return copy of the entry sleeve or <code>null</code> if |
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159 there is no entry in the cache. |
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160 */ |
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161 EntrySleeveImpl dirtyRead(OID aUID) { |
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162 EntrySleeveImpl myResult = null; |
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163 |
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164 synchronized(theJobInfo) { |
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165 ArrayList myStates = (ArrayList) theJobInfo.get(aUID); |
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166 |
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167 if (myStates != null) { |
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168 synchronized(myStates) { |
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169 WriteRequest myRequest = (WriteRequest) |
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170 myStates.get(myStates.size() - 1); |
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171 |
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172 try { |
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173 myRequest.lock(); |
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174 |
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175 myResult = myRequest.newSleeve(); |
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176 |
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177 myRequest.unlock(); |
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178 } catch (InterruptedException anIE) { |
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179 EntryStorage.theLogger.log(Level.SEVERE, |
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180 "Failed to copy sleeve", |
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181 anIE); |
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182 } |
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183 } |
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184 } |
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185 } |
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186 |
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187 return myResult; |
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188 } |
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189 |
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190 /** |
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191 Callback for the Job when it is executed by the WriteDaemon |
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192 */ |
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193 void update(OID aUID) { |
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194 try { |
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195 ArrayList myQueue; |
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196 |
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197 synchronized(theJobInfo) { |
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198 myQueue = (ArrayList) theJobInfo.get(aUID); |
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199 } |
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200 |
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201 WriteRequest myRequest; |
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202 |
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203 synchronized(myQueue) { |
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204 myRequest = (WriteRequest) myQueue.get(0); |
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205 |
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206 try { |
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207 myRequest.lock(); |
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208 |
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209 myRequest.markActive(); |
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210 |
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211 myRequest.unlock(); |
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212 } catch (InterruptedException anIE) { |
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213 EntryStorage.theLogger.log(Level.SEVERE, |
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214 "Failed to lock request for processing", anIE); |
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215 } |
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216 } |
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217 |
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218 myRequest.flush(theEditor); |
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219 |
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220 /* |
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221 Regardless of which write this is, once we've done one, the |
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222 indexes on disk contain any search material we require and |
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223 thus we can clear the CacheIndexer. |
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224 */ |
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225 if ((myRequest.getStateFlags() & SleeveState.NOT_ON_DISK) != 0) { |
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226 /* |
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227 If it's not also marked as deleted (in which case the |
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228 indexer will already be updated) |
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229 */ |
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230 if ((myRequest.getStateFlags() & SleeveState.DELETED) == 0) { |
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231 CacheIndexer.getIndexer( |
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232 theEditor.getType()).flushed(myRequest.getSleeve()); |
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233 } |
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234 } |
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235 |
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236 synchronized(theJobInfo) { |
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237 synchronized(myQueue) { |
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238 |
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239 // Remove the consolidated image stored previously |
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240 myQueue.remove(0); |
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241 |
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242 if (myQueue.size() == 0) { |
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243 theJobInfo.remove(aUID); |
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244 } |
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245 } |
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246 } |
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247 |
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248 } catch (Exception anE) { |
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249 EntryStorage.theLogger.log(Level.SEVERE, |
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250 "Failed to sync cache: " + theEditor, |
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251 anE); |
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252 } |
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253 } |
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254 |
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255 private static final class Job implements Runnable { |
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256 private OID theUID; |
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257 private WriteBuffer theBuffer; |
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258 |
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259 Job(OID aUID, WriteBuffer aBuffer) { |
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260 theUID = aUID; |
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261 theBuffer = aBuffer; |
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262 } |
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263 |
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264 public void run() { |
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265 theBuffer.update(theUID); |
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266 } |
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267 } |
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268 |
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269 private static final class WriteRequest { |
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270 /* |
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271 For performance measurement only |
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272 */ |
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273 private static final Object theLockObject = new Object(); |
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274 private static int numMerges; |
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275 |
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276 private int theStateFlags; |
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277 |
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278 private boolean isActive; |
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279 |
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280 private PersistentEntry theEntry; |
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281 |
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282 private Mutex theLock = new Mutex(); |
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283 |
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284 WriteRequest(int aState, PersistentEntry anEntry) { |
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285 theEntry = anEntry; |
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286 theStateFlags = aState; |
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287 } |
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288 |
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289 void markActive() { |
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290 isActive = true; |
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291 } |
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292 |
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293 boolean isActive() { |
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294 return isActive; |
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295 } |
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296 |
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297 void lock() throws InterruptedException { |
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298 theLock.acquire(); |
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299 } |
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300 |
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301 void unlock() { |
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302 theLock.release(); |
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303 } |
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304 |
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305 int getStateFlags() { |
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306 return theStateFlags; |
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307 } |
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308 |
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309 EntrySleeveImpl getSleeve() { |
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310 EntrySleeveImpl mySleeve = new EntrySleeveImpl(theEntry); |
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311 |
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312 mySleeve.getState().setExplicit(theStateFlags); |
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313 mySleeve.getState().clear(SleeveState.NOT_ON_DISK); |
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314 |
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315 return mySleeve; |
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316 } |
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317 |
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318 void merge(WriteRequest anOther) { |
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319 /* |
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320 synchronized(theLockObject) { |
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321 ++numMerges; |
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322 System.err.println("Coalesce: " + numMerges); |
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323 } |
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324 */ |
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325 |
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326 theStateFlags |= anOther.theStateFlags; |
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327 |
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328 theEntry = anOther.getSleeve().getPersistentRep(); |
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329 } |
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330 |
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331 EntrySleeveImpl newSleeve() { |
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332 EntrySleeveImpl mySleeve = |
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333 new EntrySleeveImpl(theEntry.duplicate()); |
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334 |
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335 mySleeve.getState().setExplicit(theStateFlags); |
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336 mySleeve.getState().clear(SleeveState.NOT_ON_DISK); |
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337 |
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338 return mySleeve; |
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339 } |
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340 |
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341 void flush(EntryEditor anEditor) throws IOException { |
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342 if ((theStateFlags & SleeveState.DELETED) != 0) { |
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343 if ((theStateFlags & SleeveState.NOT_ON_DISK) == 0) { |
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344 anEditor.delete(theEntry); |
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345 } |
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346 } else if ((theStateFlags & SleeveState.NOT_ON_DISK) != 0){ |
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347 anEditor.write(theEntry); |
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348 } else { |
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349 anEditor.update(theEntry); |
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350 } |
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351 } |
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352 } |
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353 |
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354 public class DirtyBufferGenerator implements StatGenerator { |
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355 private long _id = StatGenerator.UNSET_ID; |
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356 |
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357 private Map _jobInfo; |
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358 private String _type; |
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359 |
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360 public DirtyBufferGenerator(String aType, Map aJobInfo) { |
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361 _type = aType; |
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362 _jobInfo = aJobInfo; |
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363 } |
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364 |
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365 public long getId() { |
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366 return _id; |
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367 } |
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368 |
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369 public void setId(long anId) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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370 _id = anId; |
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371 } |
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372 |
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373 public Stat generate() { |
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374 int myBufferSize; |
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375 |
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376 synchronized(_jobInfo) { |
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377 myBufferSize = _jobInfo.size(); |
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378 } |
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379 |
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380 return new DirtyBufferStat(_id, _type, myBufferSize); |
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381 } |
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382 } |
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383 } |