Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/notify/EventQueue.java @ 33:0b9265358617
Added tag 2.1.1 for changeset a77f0a9ed93c
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:52:10 +0100 |
parents | 3dc0c5604566 |
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rev | line source |
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0
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1 package org.dancres.blitz.notify; |
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2 |
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3 import java.io.IOException; |
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4 import java.rmi.MarshalledObject; |
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5 import java.rmi.RemoteException; |
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6 import java.util.logging.Level; |
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7 import java.util.logging.Logger; |
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8 import java.util.Iterator; |
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9 |
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10 import net.jini.config.ConfigurationException; |
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11 import net.jini.core.event.RemoteEventListener; |
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12 |
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13 import org.dancres.blitz.ActiveObject; |
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14 import org.dancres.blitz.ActiveObjectRegistry; |
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15 import org.dancres.blitz.Logging; |
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16 import org.dancres.blitz.config.ConfigurationFactory; |
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17 import org.dancres.blitz.mangler.MangledEntry; |
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18 import org.dancres.blitz.oid.OID; |
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19 import org.dancres.blitz.stats.StatsBoard; |
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20 import org.dancres.blitz.txn.TxnState; |
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21 import org.dancres.blitz.txn.TxnManager; |
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22 import EDU.oswego.cs.dl.util.concurrent.BoundedLinkedQueue; |
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23 import EDU.oswego.cs.dl.util.concurrent.PooledExecutor; |
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24 import org.dancres.blitz.util.QueueStatGenerator; |
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25 |
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26 /** |
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27 The heart of the notify implementation. Events are passed to here and |
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28 processed against templates. Resulting events are then passed into the |
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29 notification pool for dispatch. <P> |
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30 |
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31 <p>For a transaction end event, we remove any associated registrations held |
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32 in EventGeneratorFactory.</p> |
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33 */ |
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34 public class EventQueue implements ActiveObject { |
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35 static Logger theLogger = |
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36 Logging.newLogger("org.dancres.blitz.notify.EventQueue"); |
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37 |
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38 private static final EventQueue theEventQueue = new EventQueue(); |
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39 |
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40 public static EventQueue get() { |
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41 return theEventQueue; |
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42 } |
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43 |
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44 private PooledExecutor theProcessors; |
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45 |
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46 private long theEventCount = 0; |
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47 |
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48 private RemoteEventDispatcher theDispatcher = new RemoteEventDispatcher(); |
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49 |
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50 private int NUM_PROCESSORS = 10; |
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51 |
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52 private int QUEUE_BOUND = 100; |
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53 |
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54 private EventQueue() { |
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55 ActiveObjectRegistry.add(this); |
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56 |
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57 try { |
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58 NUM_PROCESSORS = ((Integer) |
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59 ConfigurationFactory.getEntry("maxEventProcessors", |
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60 int.class, |
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61 new Integer(1))).intValue(); |
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62 QUEUE_BOUND = ((Integer) |
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63 ConfigurationFactory.getEntry("eventQueueBound", |
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64 int.class, |
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65 new Integer(0))).intValue(); |
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66 |
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67 theLogger.log(Level.INFO, "Max Event Processors: " + |
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68 NUM_PROCESSORS); |
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69 theLogger.log(Level.INFO, "Event Queue Bound: " + QUEUE_BOUND); |
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70 |
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71 } catch (ConfigurationException aCE) { |
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72 theLogger.log(Level.SEVERE, "Failed to load config", aCE); |
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73 } |
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74 } |
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75 |
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76 public void add(QueueEvent anEvent) { |
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77 add(anEvent, false); |
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78 } |
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79 |
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80 public void add(QueueEvent anEvent, boolean aWaitIndicator) { |
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81 if (TxnManager.get().isRecovery()) |
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82 return; |
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83 |
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84 // No-one listening, no point in doing work |
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85 // |
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86 if (EventGeneratorFactory.get().getCount() == 0) |
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87 return; |
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88 |
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89 if (theLogger.isLoggable(Level.FINEST)) |
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90 theLogger.log(Level.FINEST, "Event: " + anEvent.getType() + ", " + |
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91 anEvent.getTxn() + ", " + anEvent.getContext()); |
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92 try { |
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93 /* |
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94 * WTF? For some reason, javac can't resolve the two types below to |
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95 * DispatchTask without explicit casting - suspecting cursed generics |
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96 * and type reasoning grrrrr |
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97 */ |
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98 DispatchTask aTask = (aWaitIndicator == true) ? |
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99 (DispatchTask) new BlockingDispatchImpl(this, anEvent) : |
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100 (DispatchTask) new NonblockingDispatchImpl(this, anEvent); |
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101 |
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102 theProcessors.execute(aTask); |
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103 |
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104 aTask.block(); |
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105 } catch (InterruptedException anIE) { |
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106 theLogger.log(Level.FINEST, "Failed to queue event"); |
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107 } |
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108 } |
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109 |
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110 public void insert(EventGenerator anEventGenerator) throws IOException { |
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111 EventGeneratorFactory.get().addTemporary(anEventGenerator); |
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112 } |
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113 |
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114 /** |
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115 @todo Lock txn during adding of reg for non-null txns. |
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116 */ |
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117 public void register(MangledEntry aTemplate, TxnState aTxn, |
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118 RemoteEventListener aListener, long aLeaseTime, |
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119 MarshalledObject aHandback, |
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120 Registrar aRegistrar) |
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121 throws IOException, RemoteException { |
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122 |
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123 |
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124 if (aTxn == null) { |
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125 EventGenerator myGenerator = |
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126 EventGeneratorFactory.get().newPersistentGenerator(aTemplate, |
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127 aListener, |
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128 aLeaseTime, |
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129 aHandback); |
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130 |
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131 long myFirstSeqNum = myGenerator.getStartSeqNum(); |
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132 |
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133 aRegistrar.newRegistration(myGenerator.getSourceId(), |
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134 myFirstSeqNum, |
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135 new SpaceNotifyUID(myGenerator.getId())); |
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136 } else { |
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137 EventGenerator myGenerator = |
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138 EventGeneratorFactory.get().newTransientGenerator(aTemplate, |
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139 aListener, |
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140 aLeaseTime, |
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141 aHandback, |
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142 aTxn); |
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143 |
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144 long myFirstSeqNum = myGenerator.getStartSeqNum(); |
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145 |
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146 aRegistrar.newRegistration(myGenerator.getSourceId(), |
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147 myFirstSeqNum, |
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148 new SpaceNotifyUID(myGenerator.getId())); |
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149 } |
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150 } |
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151 |
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152 public void registerVisibility(MangledEntry[] aTemplates, TxnState aTxn, |
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153 RemoteEventListener aListener, |
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154 long aLeaseTime, |
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155 MarshalledObject aHandback, |
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156 Registrar aRegistrar, boolean visibleOnly) |
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157 throws IOException, RemoteException { |
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158 long myFirstSeqNum; |
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159 EventGenerator myGenerator; |
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160 |
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161 if (aTxn == null) { |
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162 myGenerator = |
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163 EventGeneratorFactory.get().newPersistentVisibility(aTemplates, |
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164 aListener, |
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165 aLeaseTime, |
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166 aHandback, |
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167 visibleOnly); |
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168 } else { |
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169 myGenerator = |
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170 EventGeneratorFactory.get().newTransientVisibility(aTemplates, |
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171 aListener, |
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172 aLeaseTime, |
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173 aHandback, |
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174 aTxn, |
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175 visibleOnly); |
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176 |
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177 } |
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178 |
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179 myFirstSeqNum = myGenerator.getStartSeqNum(); |
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180 aRegistrar.newRegistration(myGenerator.getSourceId(), |
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181 myFirstSeqNum, |
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182 new SpaceNotifyUID(myGenerator.getId())); |
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183 } |
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184 |
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185 public void begin() { |
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186 try { |
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187 /* |
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188 * Apply the jump before processing any events. This will be |
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189 * performed on the in-memory copy and placed on disk at the |
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190 * next checkpoint. In the meantime, we make sure correct state |
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191 * is preserved using log records |
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192 */ |
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193 EventGeneratorFactory.get().jumpSequenceNumbers(); |
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194 } catch (IOException anIOE) { |
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195 theLogger.log(Level.SEVERE, "Failed to apply restart jump", anIOE); |
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196 } |
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197 |
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198 BoundedLinkedQueue myQueue; |
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199 |
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200 if (QUEUE_BOUND == 0) { |
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201 theLogger.log(Level.INFO, "Event queue bounding disabled"); |
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202 myQueue = new BoundedLinkedQueue(Integer.MAX_VALUE); |
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203 theProcessors = |
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204 new PooledExecutor(myQueue, NUM_PROCESSORS); |
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205 } else { |
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206 theLogger.log(Level.INFO, "Event queue bounding enabled"); |
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207 myQueue = new BoundedLinkedQueue(QUEUE_BOUND); |
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208 theProcessors = |
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209 new PooledExecutor(myQueue, NUM_PROCESSORS); |
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210 } |
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211 |
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212 theProcessors.setMinimumPoolSize(NUM_PROCESSORS); |
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213 // theProcessors.waitWhenBlocked(); |
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214 |
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215 StatsBoard.get().add(new QueueStatGenerator("Events", myQueue)); |
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216 } |
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217 |
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218 public void halt() { |
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219 theProcessors.shutdownNow(); |
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220 |
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221 synchronized(this) { |
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222 theLogger.log(Level.INFO, "Processed: " + theEventCount); |
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223 } |
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224 } |
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225 |
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226 void dispatchImpl(DispatchTask aTask) { |
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227 synchronized(this) { |
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228 ++theEventCount; |
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229 } |
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230 |
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231 switch (aTask.getEvent().getType()) { |
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232 case QueueEvent.TRANSACTION_ENDED : |
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233 case QueueEvent.ENTRY_WRITE : |
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234 case QueueEvent.ENTRY_WRITTEN : |
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235 case QueueEvent.ENTRY_VISIBLE : |
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236 case QueueEvent.ENTRY_NOT_CONFLICTED : { |
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237 iterateMatches(aTask); |
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238 break; |
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239 } |
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240 } |
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241 } |
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242 |
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243 private void iterateMatches(DispatchTask aTask) { |
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244 QueueEvent myEvent = aTask.getEvent(); |
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245 long myCurrentTime = System.currentTimeMillis(); |
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246 QueueEvent.Context myContext = myEvent.getContext(); |
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247 MangledEntry myEntry = null; |
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248 |
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249 if (myContext != null) |
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250 myEntry = myEvent.getContext().getEntry(); |
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251 |
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252 try { |
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253 Iterator myGenerators = |
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254 EventGeneratorFactory.get().getGenerators(); |
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255 |
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256 while (myGenerators.hasNext()) { |
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257 EventGenerator myGenerator = (EventGenerator) myGenerators.next(); |
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258 |
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259 if ((myGenerator.canSee(myEvent, myCurrentTime)) && |
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260 (myGenerator.matches(myEntry))) { |
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261 theDispatcher.sendEvent(aTask, myGenerator); |
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262 } |
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263 } |
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264 } catch (IOException anIOE) { |
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265 theLogger.log(Level.SEVERE, "Couldn't recover generators from factory"); |
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266 } finally { |
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267 aTask.enableResolve(); |
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268 } |
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269 } |
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270 |
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271 |
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272 public boolean renew(OID aOID, long anExpiry) |
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273 throws IOException { |
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274 |
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275 return EventGeneratorFactory.get().renew(aOID, anExpiry); |
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276 } |
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277 |
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278 public boolean cancel(OID aOID) |
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279 throws IOException { |
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280 |
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281 return EventGeneratorFactory.get().cancel(aOID); |
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282 } |
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283 |
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284 public void kill(OID anOID) throws IOException { |
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285 EventGeneratorFactory.get().killTemplate(anOID); |
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286 } |
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287 } |