Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/NewView.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 }