Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/notify/VisibilityImpl.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.io.Serializable; |
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5 |
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6 import java.rmi.MarshalledObject; |
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7 import java.rmi.RemoteException; |
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8 import java.rmi.NoSuchObjectException; |
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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 import net.jini.core.event.RemoteEvent; |
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14 import net.jini.core.event.UnknownEventException; |
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15 |
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16 import net.jini.core.transaction.TransactionException; |
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17 |
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18 import net.jini.space.AvailabilityEvent; |
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19 import net.jini.space.JavaSpace; |
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20 |
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21 import org.dancres.blitz.txn.TxnId; |
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22 import org.dancres.blitz.txn.TxnManager; |
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23 |
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24 import org.dancres.blitz.mangler.MangledEntry; |
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25 |
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26 import org.dancres.blitz.entry.Types; |
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27 |
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28 import org.dancres.blitz.oid.OID; |
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29 |
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30 import org.dancres.blitz.task.Tasks; |
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31 |
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32 /** |
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33 <p> Represents a single registration via registerForVisbility. If it's |
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34 transactional, it will never be saved as it's considered temporary. If |
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35 it's transactional it will be saved to disk. In addition, it's state will |
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36 be saved to the log periodically (on a number of allocations basis) to |
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37 preserve data in case of a crash. <p> |
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38 |
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39 <p> This class uses notifyPreparer to do initial preparation of the |
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40 passed RemoteEventListener when constructed from scratch (i.e. it's a new |
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41 registration). It uses recoveredNotifyPreparer in those cases where it |
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42 has been de-serialized from storage and is about to be used for the first |
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43 time post a restart </p> |
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44 |
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45 <p> Instances of this object can be "tainted" for various reasons including |
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46 certain kinds of exception from the remote notify implementation, lease |
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47 expiry or transaction commit. Tainting prevents any further operations |
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48 against this instance such as event dispatch, logging changes to disk and |
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49 lease renewal. Tainting also results in cleanup for the registration being |
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50 scheduled.</p> |
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51 |
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52 @todo Refactor the commonet stuff out of here and EventGeneratorImpl |
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53 */ |
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54 public class VisibilityImpl implements EventGenerator { |
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55 private OID theOID; |
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56 private MangledEntry[] theTemplates; |
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57 private MarshalledObject theHandback; |
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58 private MarshalledObject theMarshalledListener; |
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59 private long theSourceId; |
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60 private long theSeqNum; |
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61 private long theLeaseTime; |
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62 private long theStartSeqNum; |
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63 private boolean doVisible; |
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64 |
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65 private int thePingCount; |
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66 |
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67 /** |
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68 Indicates if we've done proxy preparation on the RemoteEventListener |
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69 */ |
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70 private boolean isPrepared; |
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71 |
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72 /** |
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73 Indicates when we're no longer generating events either because we |
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74 couldn't get an appropriate response from the client or because |
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75 we're being deleted. |
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76 */ |
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77 private boolean isTainted; |
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78 |
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79 private RemoteEventListener theListener; |
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80 |
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81 /* |
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82 VisibilityImpls against a specific transaction are never saved so |
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83 we make this transient to help in picking up code which hasn't |
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84 taken account of this fact..... |
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85 */ |
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86 private TxnId theTxnId; |
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87 |
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88 static VisibilityImpl restoreGenerator(VisibilityImplState aState) { |
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89 return new VisibilityImpl(aState); |
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90 } |
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91 |
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92 private VisibilityImpl(VisibilityImplState aState) { |
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93 theOID = aState.getOID(); |
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94 theTemplates = aState.getTemplates(); |
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95 theHandback = aState.getHandback(); |
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96 theMarshalledListener = aState.getListener(); |
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97 theSourceId = aState.getSourceId(); |
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98 theSeqNum = aState.getSeqNum(); |
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99 theLeaseTime = aState.getLeaseTime(); |
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100 doVisible = aState.getJustVisible(); |
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101 } |
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102 |
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103 VisibilityImpl(MangledEntry[] aTemplates, |
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104 MarshalledObject anObject, |
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105 RemoteEventListener aDest, long aSeqNum, |
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106 long aLeaseTime, boolean justVisible) |
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107 throws RemoteException { |
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108 this(aTemplates, anObject, aDest, aSeqNum, |
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109 aLeaseTime, null, justVisible); |
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110 } |
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111 |
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112 VisibilityImpl(MangledEntry[] aTemplates, |
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113 MarshalledObject anObject, |
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114 RemoteEventListener aDest, long aSeqNum, |
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115 long aLeaseTime, TxnId aTxnId, boolean justVisible) |
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116 throws RemoteException { |
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117 |
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118 theTemplates = aTemplates; |
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119 theHandback = anObject; |
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120 theSeqNum = aSeqNum; |
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121 theStartSeqNum = aSeqNum; |
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122 theTxnId = aTxnId; |
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123 theLeaseTime = aLeaseTime; |
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124 theListener = (RemoteEventListener) |
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125 GeneratorConfig.getPreparer().prepareProxy(aDest); |
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126 doVisible = justVisible; |
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127 |
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128 try { |
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129 theMarshalledListener = new MarshalledObject(aDest); |
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130 } catch (IOException anIOE) { |
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131 throw new RemoteException("Failed to marshall listener", anIOE); |
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132 } |
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133 |
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134 isPrepared = true; |
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135 } |
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136 |
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137 public void assign(OID anOID) { |
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138 theOID = anOID; |
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139 |
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140 if (theTxnId == null) |
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141 theSourceId = theOID.getId(); |
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142 else |
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143 theSourceId = theTxnId.getId(); |
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144 } |
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145 |
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146 /** |
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147 Return the first sequence number that this event generator ever |
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148 produced. |
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149 */ |
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150 public long getStartSeqNum() { |
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151 return theStartSeqNum; |
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152 } |
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153 |
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154 public OID getId() { |
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155 return theOID; |
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156 } |
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157 |
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158 public boolean isPersistent() { |
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159 return (theTxnId == null); |
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160 } |
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161 |
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162 public long getSourceId() { |
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163 return theSourceId; |
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164 } |
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165 |
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166 /** |
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167 Once an Visibility becomes tainted it will generate no more events |
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168 and schedule cleanup. |
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169 */ |
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170 public void taint() { |
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171 synchronized(this) { |
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172 // Tainting can only be done once |
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173 // |
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174 if (isTainted) |
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175 return; |
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176 |
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177 isTainted = true; |
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178 } |
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179 |
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180 try { |
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181 Tasks.queue(new CleanTask(getId())); |
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182 } catch (InterruptedException anIE) { |
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183 EventQueue.theLogger.log(Level.SEVERE, |
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184 "Failed to lodge cleanup for: " + getId(), anIE); |
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185 } |
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186 } |
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187 |
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188 /* ******************************************************************** |
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189 Event filtering starts here |
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190 **********************************************************************/ |
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191 |
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192 /** |
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193 Determines whether the passed QueueEvent is "visible" to this |
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194 Visibility. This is determind by checking transaction id's, expiry |
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195 and that the generator isn't "tainted" |
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196 */ |
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197 public boolean canSee(QueueEvent anEvent, long aTime) { |
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198 synchronized(this) { |
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199 if (isTainted) |
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200 return false; |
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201 |
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202 if (aTime > theLeaseTime) { |
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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 // If it's a visibility event, it's the result of something |
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208 // that was previously written and committed (and generated events |
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209 // previously) which has now been marked taken and now is not |
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210 // taken |
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211 if ((anEvent.getType() == QueueEvent.ENTRY_VISIBLE) || |
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212 // Only post this one if user has said they're interested |
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213 // in visible operations |
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214 ((anEvent.getType() == QueueEvent.ENTRY_NOT_CONFLICTED) && |
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215 (!doVisible))) |
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216 return true; |
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217 |
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218 // If we're associated with a transaction..... |
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219 if (theTxnId != null) { |
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220 |
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221 if ((anEvent.getType() == QueueEvent.TRANSACTION_ENDED) && |
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222 (theTxnId.equals(anEvent.getTxn().getId()))) { |
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223 taint(); |
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224 return false; |
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225 } |
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226 |
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227 // We see all Written's including those generated by us |
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228 if (anEvent.getType() == QueueEvent.ENTRY_WRITTEN) |
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229 return true; |
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230 |
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231 // If it's not a written we can only see it if we originated it |
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232 return (anEvent.getTxn().getId().equals(theTxnId)); |
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233 } else { |
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234 // Only see ENTRY_WRITTENS |
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235 return (anEvent.getType() == QueueEvent.ENTRY_WRITTEN); |
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236 } |
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237 } |
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238 } |
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239 |
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240 public boolean matches(MangledEntry anEntry) { |
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241 for (int i = 0; i < theTemplates.length; i++) { |
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242 MangledEntry myTemplate = theTemplates[i]; |
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243 |
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244 if (Types.isSubtype(myTemplate.getType(), anEntry.getType())) { |
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245 if (myTemplate.match(anEntry)) |
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246 return true; |
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247 } |
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248 } |
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249 |
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250 return false; |
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251 } |
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252 |
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253 /* ******************************************************************** |
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254 Lease management starts here |
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255 **********************************************************************/ |
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256 |
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257 public boolean renew(long aTime) { |
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258 synchronized(this) { |
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259 if (isTainted) |
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260 return false; |
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261 |
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262 if (System.currentTimeMillis() > theLeaseTime) |
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263 return false; |
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264 |
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265 theLeaseTime = aTime; |
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266 return true; |
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267 } |
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268 } |
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269 |
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270 /* ******************************************************************** |
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271 Recovery starts here |
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272 **********************************************************************/ |
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273 |
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274 public void recover(long aSeqNum) { |
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275 synchronized(this) { |
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276 if (aSeqNum > theSeqNum) { |
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277 theSeqNum = aSeqNum; |
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278 } |
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279 } |
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280 } |
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281 |
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282 /** |
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283 Jumps the sequence number by the RESTART_JUMP |
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284 */ |
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285 public long jumpSequenceNumber() { |
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286 synchronized(this) { |
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287 theSeqNum += (GeneratorConfig.getRestartJump() + |
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288 GeneratorConfig.getSaveInterval()); |
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289 |
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290 return theSeqNum; |
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291 } |
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292 } |
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293 |
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294 /** |
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295 Jumps the sequence number if it's not already at this minimum. |
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296 */ |
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297 public long jumpSequenceNumber(long aMin) { |
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298 synchronized(this) { |
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299 if (theSeqNum < aMin) { |
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300 theSeqNum = aMin + GeneratorConfig.getSaveInterval(); |
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301 } |
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302 |
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303 return theSeqNum; |
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304 } |
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305 } |
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306 |
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307 /* ******************************************************************** |
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308 Event Generation starts here |
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309 **********************************************************************/ |
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310 |
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311 /** |
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312 Dispatches a remote event to a client. |
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313 */ |
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314 public void ping(QueueEvent anEvent, JavaSpace aSource) { |
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315 SeqNumInterval mySnapshot = null; |
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316 |
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317 synchronized(this) { |
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318 if (isTainted) |
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319 return; |
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320 |
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321 RemoteEventListener myTarget = null; |
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322 |
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323 try { |
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324 RemoteEvent myEvent = |
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325 newEvent(aSource, anEvent.getContext().getEntry(), |
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326 (anEvent.getType() != QueueEvent.ENTRY_NOT_CONFLICTED)); |
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327 |
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328 myTarget = getDest(); |
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329 |
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330 myTarget.notify(myEvent); |
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331 |
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332 mySnapshot = shouldLog(); |
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333 |
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334 } catch (UnknownEventException aUEE) { |
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335 RemoteEventDispatcher.theLogger.log(Level.SEVERE, |
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336 "Couldn't send event [Trash]" + |
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337 myTarget, aUEE); |
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338 taint(); |
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339 } catch (NoSuchObjectException anNSOE) { |
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340 RemoteEventDispatcher.theLogger.log(Level.SEVERE, |
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341 "Couldn't send event [Trash]" + |
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342 myTarget, anNSOE); |
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343 taint(); |
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344 } catch (RemoteException anRE) { |
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345 RemoteEventDispatcher.theLogger.log(Level.SEVERE, |
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346 "Couldn't send event " + |
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347 myTarget, anRE); |
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348 } |
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349 } |
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350 |
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351 try { |
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352 /* |
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353 See recover() for details on why we can log this outside of the |
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354 lock |
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355 */ |
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356 if (mySnapshot != null) |
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357 TxnManager.get().log(mySnapshot); |
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358 } catch (TransactionException aTE) { |
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359 RemoteEventDispatcher.theLogger.log(Level.SEVERE, |
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360 "Couldn't update EventGenerator", aTE); |
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361 } |
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362 } |
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363 |
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364 private RemoteEvent newEvent(JavaSpace aSource, MangledEntry anEntry, |
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365 boolean isVisible) { |
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366 ++thePingCount; |
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367 |
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368 return new AvailabilityEventImpl(aSource, theSourceId, theSeqNum++, |
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369 theHandback, anEntry, isVisible); |
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370 } |
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371 |
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372 private RemoteEventListener getDest() |
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373 throws RemoteException { |
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374 |
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375 // This flag is only set in the constructor or by us. |
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376 if (!isPrepared) { |
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377 try { |
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378 Object myListener = theMarshalledListener.get(); |
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379 |
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380 theListener = (RemoteEventListener) |
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381 GeneratorConfig.getRecoveryPreparer().prepareProxy(myListener); |
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382 isPrepared = true; |
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383 } catch (IOException anIOE) { |
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384 throw new RemoteException("Failed to unmarshall listener", |
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385 anIOE); |
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386 } catch (ClassNotFoundException aCNFE) { |
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387 throw new RemoteException("Failed to load class for listener", |
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388 aCNFE); |
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389 } |
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390 } |
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391 |
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392 return theListener; |
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393 } |
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394 |
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395 /* ******************************************************************** |
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396 State save/recovery starts here |
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397 **********************************************************************/ |
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398 |
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399 public EventGeneratorState getMemento() { |
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400 synchronized(this) { |
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401 return new VisibilityImplState(theOID, theTemplates, |
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402 theHandback, |
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403 theMarshalledListener, |
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404 theSourceId, |
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405 theSeqNum, theLeaseTime, |
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406 theTxnId, doVisible); |
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407 } |
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408 } |
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409 |
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410 /** |
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411 * Call this with synchronized asserted on the Generator |
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412 */ |
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413 private SeqNumInterval shouldLog() { |
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414 // Never log transactional notify registrations |
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415 // |
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416 if (theTxnId != null) { |
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417 thePingCount = 0; |
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418 return null; |
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419 } |
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420 |
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421 if (thePingCount == GeneratorConfig.getSaveInterval()) { |
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422 thePingCount = 0; |
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423 return new SeqNumInterval(theOID, theSeqNum); |
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424 } else |
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425 return null; |
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426 } |
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427 } |