Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/notify/EventGeneratorImpl.java @ 34:6f68e94c1fb8 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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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 |
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5 import java.rmi.MarshalledObject; |
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6 import java.rmi.RemoteException; |
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7 import java.rmi.NoSuchObjectException; |
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8 |
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9 import java.util.logging.Level; |
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10 |
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11 import net.jini.core.event.RemoteEventListener; |
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12 import net.jini.core.event.RemoteEvent; |
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13 import net.jini.core.event.UnknownEventException; |
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14 |
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15 import net.jini.core.transaction.TransactionException; |
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16 |
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17 import net.jini.space.JavaSpace; |
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18 |
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19 import org.dancres.blitz.txn.TxnId; |
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20 import org.dancres.blitz.txn.TxnManager; |
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21 |
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22 import org.dancres.blitz.mangler.MangledEntry; |
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23 |
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24 import org.dancres.blitz.entry.Types; |
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25 |
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26 import org.dancres.blitz.oid.OID; |
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27 |
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28 import org.dancres.blitz.task.Tasks; |
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29 |
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30 /** |
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31 <p> Represents a single registration via notify. If it's transactional, |
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32 it will never be saved as it's considered temporary. If it's transactional |
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33 it will be saved to disk. In addition, it's state will be saved to the |
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34 log periodically (on a number of allocations basis) to preserve data |
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35 in case of a crash. <p> |
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36 |
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37 <p> This class uses notifyPreparer to do initial preparation of the |
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38 passed RemoteEventListener when constructed from scratch (i.e. it's a new |
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39 registration). It uses recoveredNotifyPreparer in those cases where it |
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40 has been de-serialized from storage and is about to be used for the first |
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41 time post a restart </p> |
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42 |
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43 <p> Instances of this object can be "tainted" for various reasons including |
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44 certain kinds of exception from the remote notify implementation, lease |
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45 expiry or transaction commit. Tainting prevents any further operations |
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46 against this instance such as event dispatch, logging changes to disk and |
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47 lease renewal. Tainting also results in cleanup for the registration being |
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48 scheduled.</p> |
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49 */ |
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50 public class EventGeneratorImpl implements EventGenerator { |
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51 private OID theOID; |
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52 private MangledEntry theTemplate; |
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53 private MarshalledObject theHandback; |
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54 private MarshalledObject theMarshalledListener; |
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55 private long theSourceId; |
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56 private long theSeqNum; |
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57 private long theLeaseTime; |
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58 private long theStartSeqNum; |
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59 |
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60 private int thePingCount; |
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61 |
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62 /** |
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63 Indicates if we've done proxy preparation on the RemoteEventListener |
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64 */ |
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65 private boolean isPrepared; |
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66 |
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67 /** |
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68 Indicates when we're no longer generating events either because we |
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69 couldn't get an appropriate response from the client or because |
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70 we're being deleted. |
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71 */ |
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72 private boolean isTainted; |
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73 |
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74 private RemoteEventListener theListener; |
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75 |
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76 private TxnId theTxnId; |
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77 |
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78 static EventGeneratorImpl restoreGenerator(EventGeneratorImplState aState) { |
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79 return new EventGeneratorImpl(aState); |
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80 } |
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81 |
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82 private EventGeneratorImpl(EventGeneratorImplState aState) { |
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83 theOID = aState.getOID(); |
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84 theTemplate = aState.getTemplate(); |
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85 theHandback = aState.getHandback(); |
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86 theMarshalledListener = aState.getListener(); |
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87 theSourceId = aState.getSourceId(); |
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88 theSeqNum = aState.getSeqNum(); |
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89 theLeaseTime = aState.getLeaseTime(); |
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90 } |
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91 |
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92 EventGeneratorImpl(MangledEntry aTemplate, |
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93 MarshalledObject anObject, |
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94 RemoteEventListener aDest, long aSeqNum, |
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95 long aLeaseTime) throws RemoteException { |
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96 this(aTemplate, anObject, aDest, aSeqNum, aLeaseTime, null); |
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97 } |
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98 |
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99 EventGeneratorImpl(MangledEntry aTemplate, |
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100 MarshalledObject anObject, |
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101 RemoteEventListener aDest, long aSeqNum, |
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102 long aLeaseTime, TxnId aTxnId) throws RemoteException { |
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103 theTemplate = aTemplate; |
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104 theHandback = anObject; |
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105 theSeqNum = aSeqNum; |
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106 theStartSeqNum = aSeqNum; |
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107 theTxnId = aTxnId; |
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108 theLeaseTime = aLeaseTime; |
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109 theListener = (RemoteEventListener) |
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110 GeneratorConfig.getPreparer().prepareProxy(aDest); |
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111 |
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112 try { |
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113 theMarshalledListener = new MarshalledObject(aDest); |
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114 } catch (IOException anIOE) { |
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115 throw new RemoteException("Failed to marshall listener", anIOE); |
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116 } |
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117 |
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118 isPrepared = true; |
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119 } |
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120 |
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121 public void assign(OID anOID) { |
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122 theOID = anOID; |
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123 |
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124 if (theTxnId == null) |
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125 theSourceId = theOID.getId(); |
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126 else |
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127 theSourceId = theTxnId.getId(); |
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128 } |
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129 |
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130 /** |
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131 Return the first sequence number that this event generator ever |
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132 produced. |
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133 */ |
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134 public long getStartSeqNum() { |
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135 return theStartSeqNum; |
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136 } |
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137 |
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138 public OID getId() { |
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139 return theOID; |
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140 } |
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141 |
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142 public boolean isPersistent() { |
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143 return (theTxnId == null); |
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144 } |
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145 |
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146 public long getSourceId() { |
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147 return theSourceId; |
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148 } |
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149 |
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150 /** |
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151 Once an EventGenerator becomes tainted it will generate no more events |
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152 and schedule cleanup. |
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153 |
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154 @todo This should maybe straight call |
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155 EventGeneratorFactory.get().killTemplate(theId); outside the sync |
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156 block - no need to use another thread |
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157 */ |
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158 public void taint() { |
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159 synchronized(this) { |
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160 // Tainting can only be done once |
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161 // |
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162 if (isTainted) |
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163 return; |
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164 |
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165 isTainted = true; |
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166 } |
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167 |
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168 try { |
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169 Tasks.queue(new CleanTask(getId())); |
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170 } catch (InterruptedException anIE) { |
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171 EventQueue.theLogger.log(Level.WARNING, |
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172 "Failed to lodge cleanup for: " + getId(), anIE); |
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173 } |
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174 } |
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175 |
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176 /* ******************************************************************** |
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177 Event filtering starts here |
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178 **********************************************************************/ |
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179 |
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180 /** |
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181 Determines whether the passed QueueEvent is "visible" to this |
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182 EventGenerator. This is determind by checking transaction id's, expiry |
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183 and that the generator isn't "tainted" |
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184 */ |
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185 public boolean canSee(QueueEvent anEvent, long aTime) { |
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186 if (anEvent.getType() == QueueEvent.ENTRY_VISIBLE) |
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187 return false; |
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188 |
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189 synchronized(this) { |
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190 if (isTainted) |
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191 return false; |
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192 |
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193 if (aTime > theLeaseTime) { |
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194 taint(); |
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195 return false; |
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196 } |
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197 |
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198 // If we're associated with a transaction..... |
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199 if (theTxnId != null) { |
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200 |
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201 if ((anEvent.getType() == QueueEvent.TRANSACTION_ENDED) && |
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202 (theTxnId.equals(anEvent.getTxn().getId()))) { |
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203 taint(); |
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204 return false; |
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205 } |
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206 |
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207 // We see all Written's including those generated by us |
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208 if (anEvent.getType() == QueueEvent.ENTRY_WRITTEN) |
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209 return true; |
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210 |
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211 // If it's not a written we can only see it if we originated it |
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212 return (anEvent.getTxn().getId().equals(theTxnId)); |
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213 } else { |
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214 // Only see ENTRY_WRITTENS |
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215 return (anEvent.getType() == QueueEvent.ENTRY_WRITTEN); |
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216 } |
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217 } |
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218 } |
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219 |
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220 public boolean matches(MangledEntry anEntry) { |
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221 return Types.isSubtype(theTemplate.getType(), anEntry.getType()) && |
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222 theTemplate.match(anEntry); |
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223 } |
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224 |
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225 /* ******************************************************************** |
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226 Lease management starts here |
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227 **********************************************************************/ |
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228 |
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229 public boolean renew(long aTime) { |
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230 synchronized(this) { |
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231 if (isTainted) |
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232 return false; |
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233 |
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234 if (System.currentTimeMillis() > theLeaseTime) |
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235 return false; |
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236 |
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237 theLeaseTime = aTime; |
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238 return true; |
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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 Recovery starts here |
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244 **********************************************************************/ |
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245 |
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246 /** |
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247 * Sequence number intervals can come out of order such that a greater |
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248 * interval may be applied before a lesser one. With that being the case |
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249 * we test the size of the sequence number and assign if it's greater |
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250 * rather than just a straight assignment |
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251 */ |
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252 public void recover(long aSeqNum) { |
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253 synchronized(this) { |
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254 if (aSeqNum > theSeqNum) { |
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255 theSeqNum = aSeqNum; |
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256 } |
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257 } |
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258 } |
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259 |
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260 /** |
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261 Jumps the sequence number by the RESTART_JUMP |
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262 */ |
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263 public long jumpSequenceNumber() { |
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264 synchronized(this) { |
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265 theSeqNum += (GeneratorConfig.getRestartJump() + |
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266 GeneratorConfig.getSaveInterval()); |
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267 |
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268 return theSeqNum; |
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269 } |
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270 } |
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271 |
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272 /** |
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273 Jumps the sequence number if it's not already at this minimum. |
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274 */ |
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275 public long jumpSequenceNumber(long aMin) { |
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276 synchronized(this) { |
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277 if (theSeqNum < aMin) { |
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278 theSeqNum = aMin + GeneratorConfig.getSaveInterval(); |
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279 } |
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280 |
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281 return theSeqNum; |
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282 } |
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283 } |
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284 |
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285 /* ******************************************************************** |
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286 Event Generation starts here |
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287 **********************************************************************/ |
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288 |
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289 /** |
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290 Dispatches a remote event to a client. |
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291 */ |
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292 public void ping(QueueEvent anEvent, JavaSpace aSource) { |
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293 SeqNumInterval mySnapshot = null; |
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294 |
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295 synchronized(this) { |
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296 if (isTainted) |
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297 return; |
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298 |
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299 RemoteEventListener myTarget = null; |
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300 |
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301 try { |
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302 |
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303 RemoteEvent myEvent = newEvent(aSource); |
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304 myTarget = getDest(); |
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305 |
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306 myTarget.notify(myEvent); |
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307 |
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308 mySnapshot = shouldLog(); |
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309 |
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310 } catch (UnknownEventException aUEE) { |
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311 RemoteEventDispatcher.theLogger.log(Level.SEVERE, |
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312 "Couldn't send event [Trash]" + |
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313 myTarget, aUEE); |
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314 taint(); |
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315 } catch (NoSuchObjectException anNSOE) { |
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316 RemoteEventDispatcher.theLogger.log(Level.SEVERE, |
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317 "Couldn't send event [Trash]" + |
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318 myTarget, anNSOE); |
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319 taint(); |
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320 } catch (RemoteException anRE) { |
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321 RemoteEventDispatcher.theLogger.log(Level.SEVERE, |
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322 "Couldn't send event " + |
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323 myTarget, anRE); |
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324 } |
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325 } |
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326 |
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327 try { |
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328 /* |
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329 See recover() for details on why we can log this outside of the |
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330 lock |
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331 */ |
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332 if (mySnapshot != null) |
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333 TxnManager.get().log(mySnapshot); |
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334 } catch (TransactionException aTE) { |
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335 RemoteEventDispatcher.theLogger.log(Level.SEVERE, |
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336 "Couldn't update EventGenerator", aTE); |
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337 } |
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338 } |
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339 |
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340 private RemoteEvent newEvent(Object aSource) { |
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341 ++thePingCount; |
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342 |
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343 return new RemoteEvent(aSource, theSourceId, theSeqNum++, |
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344 theHandback); |
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345 } |
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346 |
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347 private RemoteEventListener getDest() |
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348 throws RemoteException { |
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349 |
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350 // This flag is only set in the constructor or by us. |
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351 if (!isPrepared) { |
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352 try { |
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353 Object myListener = theMarshalledListener.get(); |
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354 |
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355 theListener = (RemoteEventListener) |
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356 GeneratorConfig.getRecoveryPreparer().prepareProxy(myListener); |
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357 isPrepared = true; |
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358 } catch (IOException anIOE) { |
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359 throw new RemoteException("Failed to unmarshall listener", |
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360 anIOE); |
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361 } catch (ClassNotFoundException aCNFE) { |
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362 throw new RemoteException("Failed to load class for listener", |
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363 aCNFE); |
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364 } |
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365 } |
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366 |
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367 return theListener; |
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368 } |
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369 |
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370 /* ******************************************************************** |
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371 State save/recovery starts here |
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372 **********************************************************************/ |
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373 |
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374 public EventGeneratorState getMemento() { |
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375 synchronized(this) { |
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376 return new EventGeneratorImplState(theOID, theTemplate, |
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377 theHandback, |
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378 theMarshalledListener, |
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379 theSourceId, |
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380 theSeqNum, theLeaseTime, |
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381 theTxnId); |
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382 } |
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383 } |
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384 |
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385 /** |
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386 Call this with synchronized asserted on the Generator |
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387 */ |
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388 private SeqNumInterval shouldLog() { |
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389 // Never log transactional notify registrations |
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390 // |
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391 if (theTxnId != null) { |
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392 thePingCount = 0; |
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393 return null; |
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394 } |
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395 |
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396 if (thePingCount == GeneratorConfig.getSaveInterval()) { |
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397 thePingCount = 0; |
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398 return new SeqNumInterval(theOID, theSeqNum); |
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399 } else |
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400 return null; |
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401 } |
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402 } |