Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/notify/EventGeneratorFactory.java @ 22:b7e52953b7a6
Add some cache/memory statistics to help spot potential exhaustion and other tuning issues.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Fri, 28 Aug 2009 17:23:33 +0100 |
parents | e92d83b192bb |
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rev | line source |
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0
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1 package org.dancres.blitz.notify; |
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2 |
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3 import java.rmi.MarshalledObject; |
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4 |
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5 import java.io.IOException; |
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6 |
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7 import java.util.ArrayList; |
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8 import java.util.Iterator; |
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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 net.jini.core.event.RemoteEventListener; |
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13 |
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14 import net.jini.core.transaction.TransactionException; |
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15 |
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16 import org.dancres.blitz.disk.DiskTxn; |
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17 import org.dancres.blitz.disk.Disk; |
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18 import org.dancres.blitz.disk.Syncable; |
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19 |
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20 import org.dancres.blitz.meta.Registry; |
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21 import org.dancres.blitz.meta.RegistryAccessor; |
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22 import org.dancres.blitz.meta.RegistryFactory; |
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23 import org.dancres.blitz.meta.MetaIterator; |
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24 import org.dancres.blitz.meta.MetaEntry; |
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25 |
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26 import org.dancres.blitz.oid.AllocatorFactory; |
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27 import org.dancres.blitz.oid.Allocator; |
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28 import org.dancres.blitz.oid.OID; |
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29 import org.dancres.blitz.oid.OIDFactory; |
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30 |
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31 import org.dancres.blitz.txn.TxnState; |
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32 import org.dancres.blitz.txn.TxnManager; |
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33 import org.dancres.blitz.txn.TxnOp; |
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34 |
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35 import org.dancres.blitz.mangler.MangledEntry; |
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36 import org.dancres.blitz.stats.StatGenerator; |
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37 import org.dancres.blitz.stats.StatsBoard; |
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38 import org.dancres.blitz.stats.Stat; |
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39 import org.dancres.blitz.stats.EventQueueStat; |
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40 import edu.emory.mathcs.backport.java.util.concurrent.ConcurrentHashMap; |
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41 |
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42 /** |
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43 Handles all the storage aspects associated with EventGenerators including |
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44 allocation, deletion and sync'ing to disk. It maintains an up-to-date |
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45 list of active EventGenerators and allows them to be transient (never |
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46 saved) or persistent as required by the caller. Transient EventGenerators |
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47 are used for transaction related notify requests whilst persistent |
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48 EventGenerators have no associated transaction. |
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49 */ |
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50 class EventGeneratorFactory implements Syncable { |
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51 static final String STORE_NAME = "BlitzEventGens"; |
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52 |
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53 private static EventGeneratorFactory theFactory |
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54 = new EventGeneratorFactory(); |
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55 |
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56 /** |
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57 Store for persistent EventGenerators |
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58 */ |
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59 private Registry theStore; |
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60 |
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61 /** |
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62 OID Allocator for EventGenerator instances |
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63 */ |
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64 private Allocator theAllocator; |
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65 |
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66 private ConcurrentHashMap theIDMap = new ConcurrentHashMap(); |
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67 |
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68 static EventGeneratorFactory get() { |
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69 return theFactory; |
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70 } |
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71 |
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72 private EventGeneratorFactory() { |
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73 StatsBoard.get().add(new GeneratorImpl()); |
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74 } |
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75 |
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76 private class GeneratorImpl implements StatGenerator { |
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77 private long _id; |
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78 |
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79 |
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80 public long getId() { |
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81 return _id; |
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82 } |
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83 |
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84 public void setId(long anId) { |
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85 _id = anId; |
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86 } |
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87 |
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88 public Stat generate() { |
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89 try { |
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90 Iterator myGens = getGenerators(); |
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91 |
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92 int myTransient = 0, myPersistent = 0; |
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93 |
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94 while (myGens.hasNext()) { |
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95 EventGenerator myGen = (EventGenerator) myGens.next(); |
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96 if (myGen.isPersistent()) |
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97 ++myPersistent; |
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98 else |
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99 ++myTransient; |
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100 } |
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101 |
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102 return new EventQueueStat(_id, myPersistent, myTransient); |
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103 } catch (Exception anE) { |
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104 return new EventQueueStat(_id, -1, -1); |
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105 } |
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106 } |
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107 } |
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108 |
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109 Iterator getGenerators() throws IOException { |
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110 loadBarrier(); |
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111 |
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112 return theIDMap.values().iterator(); |
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113 } |
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114 |
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115 int getCount() { |
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116 return theIDMap.size(); |
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117 } |
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118 |
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119 private void loadAllocator() throws IOException { |
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120 theAllocator = AllocatorFactory.get(STORE_NAME, 64, false); |
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121 } |
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122 |
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123 private synchronized void loadBarrier() throws IOException { |
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124 if (theStore == null) { |
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125 theStore = RegistryFactory.get(STORE_NAME, null); |
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126 |
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127 DiskTxn myTxn = DiskTxn.newTxn(); |
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128 |
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129 MetaIterator myState = theStore.getAccessor().readAll(); |
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130 |
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131 MetaEntry myEntry; |
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132 |
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133 while ((myEntry = myState.fetch()) != null) { |
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134 EventGeneratorState myGenState = |
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135 (EventGeneratorState) myEntry.getData(); |
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136 EventGenerator myGenerator = myGenState.getGenerator(); |
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137 |
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138 theIDMap.put(myGenerator.getId(), myGenerator); |
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139 } |
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140 |
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141 myState.release(); |
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142 |
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143 myTxn.commit(); |
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144 |
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145 loadAllocator(); |
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146 |
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147 Disk.add(this); |
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148 } |
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149 } |
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150 |
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151 EventGenerator newPersistentGenerator(MangledEntry aTemplate, |
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152 RemoteEventListener aListner, |
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153 long aLeaseTime, |
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154 MarshalledObject aHandback) |
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155 throws IOException { |
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156 |
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157 EventGenerator myGenerator = |
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158 new EventGeneratorImpl(aTemplate, aHandback, |
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159 aListner, 0, aLeaseTime); |
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160 |
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161 addReg(myGenerator); |
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162 |
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163 return myGenerator; |
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164 } |
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165 |
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166 EventGenerator newPersistentVisibility(MangledEntry[] aTemplates, |
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167 RemoteEventListener aListner, |
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168 long aLeaseTime, |
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169 MarshalledObject aHandback, |
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170 boolean visibleOnly) |
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171 throws IOException { |
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172 |
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173 EventGenerator myGenerator = |
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174 new VisibilityImpl(aTemplates, aHandback, |
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175 aListner, 0, aLeaseTime, |
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176 visibleOnly); |
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177 |
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178 addReg(myGenerator); |
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179 |
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180 return myGenerator; |
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181 } |
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182 |
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183 /** |
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184 @todo Do we need to worry about logging these in light of the |
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185 changeover to SyncBarrier based recovery? |
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186 */ |
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187 EventGenerator newTransientGenerator(MangledEntry aTemplate, |
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188 RemoteEventListener aListner, |
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189 long aLeaseTime, |
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190 MarshalledObject aHandback, |
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191 TxnState aTxn) |
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192 throws IOException { |
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193 |
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194 EventGenerator myGenerator = |
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195 new EventGeneratorImpl(aTemplate, aHandback, aListner, |
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196 0, aLeaseTime, |
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197 aTxn.getId()); |
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198 |
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199 addReg(myGenerator); |
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200 |
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201 return myGenerator; |
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202 } |
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203 |
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204 /** |
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205 @todo Do we need to worry about logging these in light of the |
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206 changeover to SyncBarrier based recovery? |
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207 */ |
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208 EventGenerator newTransientVisibility(MangledEntry[] aTemplates, |
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209 RemoteEventListener aListner, |
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210 long aLeaseTime, |
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211 MarshalledObject aHandback, |
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212 TxnState aTxn, boolean visibleOnly) |
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213 throws IOException { |
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214 |
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215 EventGenerator myGenerator = |
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216 new VisibilityImpl(aTemplates, aHandback, aListner, |
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217 0, aLeaseTime, |
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218 aTxn.getId(), visibleOnly); |
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219 |
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220 addReg(myGenerator); |
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221 |
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222 return myGenerator; |
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223 } |
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224 |
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225 public void addTemporary(EventGenerator anEventGenerator) |
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226 throws IOException { |
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227 |
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228 if (anEventGenerator.isPersistent()) |
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229 throw new IOException("Generator should be reporting transient!"); |
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230 |
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231 anEventGenerator.assign(newOID()); |
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232 insert(anEventGenerator); |
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233 } |
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234 |
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235 private OID newOID() throws IOException { |
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236 OID myOID = theAllocator.getNextId(); |
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237 |
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238 return myOID; |
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239 } |
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240 |
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241 private void addReg(EventGenerator aGen) throws IOException { |
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242 loadBarrier(); |
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243 |
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244 aGen.assign(newOID()); |
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245 |
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246 /* |
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247 If this generator is transient we log purely so that we can reset |
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248 the Allocator during recovery - we don't actually restore the |
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249 registration |
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250 */ |
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251 try { |
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252 TxnManager.get().log(new RegistrationOp(aGen.getMemento())); |
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253 } catch (TransactionException anE) { |
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254 IOException myException = |
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255 new IOException("Failed to log registration"); |
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256 myException.initCause(anE); |
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257 throw myException; |
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258 } |
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259 |
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260 insert(aGen); |
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261 } |
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262 |
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263 private void insert(EventGenerator aGen) { |
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264 // synchronized (this) { |
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265 theIDMap.put(aGen.getId(), aGen); |
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266 // } |
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267 } |
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268 |
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269 boolean renew(OID aOID, long anExpiry) |
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270 throws IOException { |
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271 |
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272 loadBarrier(); |
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273 |
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274 // synchronized(this) { |
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275 EventGenerator myGen = (EventGenerator) theIDMap.get(aOID); |
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276 |
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277 if (myGen == null) |
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278 return false; |
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279 else |
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280 return myGen.renew(anExpiry); |
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281 // } |
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282 } |
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283 |
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284 boolean cancel(OID aOID) |
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285 throws IOException { |
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286 |
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287 loadBarrier(); |
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288 |
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289 // synchronized(this) { |
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290 EventGenerator myGen = (EventGenerator) theIDMap.get(aOID); |
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291 |
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292 if (myGen == null) |
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293 return false; |
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294 else { |
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295 // Prevent further event processing |
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296 // |
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297 myGen.taint(); |
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298 killTemplate(aOID); |
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299 return true; |
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300 } |
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301 // } |
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302 } |
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303 |
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304 /** |
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305 Invoked to restore a registration. Re-insert EventGenerator if it's |
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306 not present. |
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307 */ |
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308 void recover(EventGeneratorState aState) throws IOException { |
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309 loadBarrier(); |
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310 |
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311 // synchronized(this) { |
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312 /* |
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313 We record all registrations but only fully restore the |
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314 non-transactional ones. |
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315 */ |
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316 if (aState.isPersistent()) { |
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317 if (theIDMap.get(aState.getOID()) == null) { |
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318 EventGenerator myGenerator = aState.getGenerator(); |
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319 insert(myGenerator); |
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320 } |
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321 } |
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322 // } |
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323 } |
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324 |
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325 /** |
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326 Invoked to restore a sequence number increment. Only applied if |
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327 the generator already exists from a previous checkpoint or registration |
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328 restore. |
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329 */ |
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330 void recover(OID aOID, long aSeqNum) throws IOException { |
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331 loadBarrier(); |
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332 |
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333 // synchronized(this) { |
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334 EventGenerator myGen = (EventGenerator) theIDMap.get(aOID); |
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335 |
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336 if (myGen != null) |
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337 myGen.recover(aSeqNum); |
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338 // } |
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339 } |
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340 |
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341 /** |
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342 Moved all available EventGenerator sequence numbers forward by |
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343 RESTART_JUMP |
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344 */ |
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345 void jumpSequenceNumbers() throws IOException { |
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346 loadBarrier(); |
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347 |
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348 ArrayList myJumps = new ArrayList(); |
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349 |
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350 // synchronized(this) { |
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351 Iterator myGenerators = theIDMap.values().iterator(); |
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352 |
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353 while (myGenerators.hasNext()) { |
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354 EventGenerator myGenerator = |
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355 (EventGenerator) myGenerators.next(); |
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356 |
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357 long mySeqNum = myGenerator.jumpSequenceNumber(); |
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358 |
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359 myJumps.add(new SequenceJumpRecord(myGenerator.getId(), |
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360 mySeqNum)); |
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361 } |
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362 // } |
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363 |
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364 for (int i = 0; i < myJumps.size(); i++) { |
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365 TxnOp myAction = (TxnOp) myJumps.get(i); |
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366 |
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367 try { |
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368 TxnManager.get().log(myAction); |
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369 } catch (TransactionException aTE) { |
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370 EventQueue.theLogger.log(Level.SEVERE, |
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371 "Failed to log restart jump", aTE); |
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372 } |
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373 } |
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374 } |
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375 |
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376 void jumpSequenceNumber(OID aOID, long aJump) throws IOException { |
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377 loadBarrier(); |
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378 |
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379 // synchronized(this) { |
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380 EventGenerator myGen = (EventGenerator) theIDMap.get(aOID); |
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381 |
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382 if (myGen != null) |
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383 myGen.jumpSequenceNumber(aJump); |
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384 // } |
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385 } |
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386 |
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387 void killTemplate(OID aOID) throws IOException { |
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388 EventGenerator myGen = null; |
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389 |
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390 // synchronized(this) { |
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391 myGen = (EventGenerator) theIDMap.remove(aOID); |
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392 // } |
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393 |
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394 if ((myGen != null) && (myGen.isPersistent())) { |
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395 |
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396 DiskTxn myTxn = DiskTxn.newStandalone(); |
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397 |
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398 OID myOID = myGen.getId(); |
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399 theStore.getAccessor(myTxn).delete(OIDFactory.getKey(myOID)); |
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400 myTxn.commit(true); |
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401 } |
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402 } |
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403 |
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404 public void sync() throws Exception { |
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405 if (theStore == null) |
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406 return; |
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407 |
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408 DiskTxn myTxn = DiskTxn.newStandalone(); |
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409 |
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410 RegistryAccessor myAccessor = theStore.getAccessor(myTxn); |
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411 |
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412 Iterator myGenerators = theIDMap.values().iterator(); |
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413 |
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414 while (myGenerators.hasNext()) { |
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415 EventGenerator myGenerator = |
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416 (EventGenerator) myGenerators.next(); |
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417 |
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418 if (myGenerator.isPersistent()) { |
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419 synchronized(myGenerator) { |
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420 myAccessor.save(OIDFactory.getKey(myGenerator.getId()), |
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421 myGenerator.getMemento()); |
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422 } |
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423 } |
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424 } |
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425 |
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426 myTxn.commit(true); |
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427 } |
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428 |
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429 public synchronized void close() throws Exception { |
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430 if (theStore == null) |
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431 return; |
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432 |
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433 theStore.close(); |
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434 } |
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435 } |