Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/NewView.java @ 35:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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0
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1 package org.dancres.blitz; |
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2 |
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3 import java.io.IOException; |
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4 import java.util.logging.Level; |
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5 import java.util.logging.Logger; |
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6 |
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7 import net.jini.core.transaction.TransactionException; |
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8 import net.jini.space.JavaSpace; |
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9 |
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10 import org.dancres.blitz.disk.DiskTxn; |
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11 import org.dancres.blitz.entry.*; |
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12 import org.dancres.blitz.mangler.MangledEntry; |
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13 import org.dancres.blitz.oid.OID; |
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14 import org.dancres.blitz.notify.EventGenerator; |
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15 import org.dancres.blitz.notify.EventQueue; |
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16 import org.dancres.blitz.notify.QueueEvent; |
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17 import org.dancres.blitz.notify.EventGeneratorState; |
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18 import org.dancres.struct.LinkedInstance; |
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19 |
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20 /** |
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21 <p>Reponsible for dispatching the flow of new writes into the UIDSet.</p> |
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22 */ |
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23 class NewView { |
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24 private static final Logger theLogger = |
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25 Logging.newLogger("org.dancres.blitz.NewView"); |
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26 |
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27 private EventGeneratorImpl theEventGenerator; |
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28 |
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29 private MangledEntry[] theTemplates; |
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30 private UIDSet theUIDs; |
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31 |
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32 private EntryViewImpl theView; |
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33 |
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34 NewView(EntryViewImpl aView, MangledEntry[] aTemplates, UIDSet aSet) { |
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35 theTemplates = aTemplates; |
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36 theUIDs = aSet; |
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37 theEventGenerator = new EventGeneratorImpl(); |
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38 theView = aView; |
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39 } |
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40 |
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41 EventGenerator getSearchTask() { |
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42 return theEventGenerator; |
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43 } |
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44 |
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45 /** |
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46 @return <code>true</code> if this Visitor wishes to perform a take. |
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47 */ |
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48 public boolean isDeleter() { |
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49 return false; |
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50 } |
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51 |
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52 /************************************************************************ |
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53 * View stuff |
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54 ************************************************************************/ |
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55 |
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56 private boolean atCapacity() { |
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57 /* |
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58 If we're in merge mode, theMergeTuples will tell us how many |
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59 Entry's we currently have accrued. Otherwise everything is added |
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60 to theTuples. |
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61 */ |
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62 return (theUIDs.isFull()); |
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63 } |
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64 |
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65 private class EventGeneratorImpl implements EventGenerator { |
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66 private boolean isTainted = false; |
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67 private OID theOID; |
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68 |
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69 EventGeneratorImpl() { |
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70 } |
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71 |
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72 public void assign(OID anOID) { |
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73 theOID = anOID; |
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74 } |
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75 |
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76 public long getStartSeqNum() { |
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77 return 0; |
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78 } |
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79 |
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80 public OID getId() { |
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81 return theOID; |
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82 } |
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83 |
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84 public boolean isPersistent() { |
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85 return false; |
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86 } |
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87 |
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88 public long getSourceId() { |
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89 return 0; |
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90 } |
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91 |
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92 void taint(boolean signal) { |
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93 |
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94 /* |
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95 try { |
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96 Tasks.queue(new CleanTask(getId())); |
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97 } catch (InterruptedException anIE) { |
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98 theLogger.log(Level.WARNING, |
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99 "Failed to lodge cleanup for: " + getId(), anIE); |
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100 } |
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101 */ |
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102 } |
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103 |
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104 public void taint() { |
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105 synchronized (this) { |
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106 // Tainting can only be done once |
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107 // |
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108 if (isTainted) |
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109 return; |
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110 |
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111 isTainted = true; |
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112 } |
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113 |
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114 try { |
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115 EventQueue.get().kill(getId()); |
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116 } catch (IOException anIOE) { |
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117 theLogger.log(Level.SEVERE, |
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118 "Encountered IOException during kill", anIOE); |
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119 } |
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120 } |
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121 |
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122 public boolean canSee(QueueEvent anEvent, long aTime) { |
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123 synchronized (this) { |
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124 if (isTainted) { |
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125 return false; |
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126 } |
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127 } |
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128 |
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129 // Check if it's txn_ended and my txn and call resolved if it is |
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130 if ((anEvent.getType() == QueueEvent.TRANSACTION_ENDED) && |
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131 (theView.getTxn().getId().equals(anEvent.getTxn().getId()))) { |
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132 theView.resolved(); |
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133 return false; |
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134 } |
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135 |
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136 // We want to see new writes from a transaction |
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137 // |
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138 return (anEvent.getType() == QueueEvent.ENTRY_WRITE); |
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139 } |
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140 |
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141 public boolean matches(MangledEntry anEntry) { |
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142 synchronized (this) { |
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143 if (isTainted) { |
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144 return false; |
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145 } |
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146 } |
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147 |
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148 for (int i = 0; i < theTemplates.length; i++) { |
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149 MangledEntry myTemplate = theTemplates[i]; |
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150 |
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151 if (Types.isSubtype(myTemplate.getType(), anEntry.getType())) { |
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152 if (myTemplate.match(anEntry)) { |
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153 return true; |
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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 false; |
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159 } |
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160 |
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161 public boolean renew(long aTime) { |
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162 // Nothing to do as we expire by being tainted by the enclosing |
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163 // class only |
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164 // |
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165 return true; |
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166 } |
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167 |
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168 public void recover(long aSeqNum) { |
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169 // Nothing to do |
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170 } |
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171 |
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172 public long jumpSequenceNumber() { |
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173 return 0; |
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174 } |
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175 |
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176 public long jumpSequenceNumber(long aMin) { |
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177 return 0; |
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178 } |
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179 |
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180 public void ping(QueueEvent anEvent, JavaSpace aSource) { |
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181 synchronized (this) { |
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182 if (isTainted) { |
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183 return; |
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184 } |
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185 } |
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186 |
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187 if (atCapacity()) { |
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188 taint(); |
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189 return; |
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190 } |
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191 |
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192 QueueEvent.Context myContext = anEvent.getContext(); |
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193 |
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194 SpaceEntryUID myUID = |
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195 new SpaceEntryUID(myContext.getEntry().getType(), |
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196 myContext.getOID()); |
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197 |
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198 theUIDs.add(myUID); |
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199 } |
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200 |
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201 public EventGeneratorState getMemento() { |
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202 throw new RuntimeException( |
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203 "Shouldn't be happening - we're transient"); |
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204 } |
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205 } |
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206 } |