Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/FifoSearchVisitorImpl.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; |
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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.util.LinkedList; |
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6 |
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7 import java.util.logging.*; |
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8 |
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9 import net.jini.core.transaction.TransactionException; |
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10 import net.jini.space.JavaSpace; |
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11 |
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12 import org.dancres.blitz.mangler.MangledEntry; |
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13 |
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14 import org.dancres.blitz.entry.*; |
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15 |
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16 import org.dancres.blitz.txn.TxnState; |
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17 |
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18 import org.dancres.blitz.txnlock.*; |
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19 |
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20 import org.dancres.blitz.oid.OID; |
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21 import org.dancres.blitz.notify.*; |
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22 |
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23 |
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24 /** |
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25 <p>All search results obtained by the lower layers are offered to a |
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26 SearchVisitor instance which can then determine whether the offered Entry |
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27 is suitable. This includes "deep matching" which requires that we fully |
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28 compare the fields of template to entry. The lower-layers do not perform |
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29 this task - they return the entry's that are a probable match. In |
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30 addition, instances of search visitor check transaction locks etc. which |
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31 the lower layers know nothing about.</p> |
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32 |
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33 <p>FifoSearchVisitorImpl enforces some ordering requirements that aren't |
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34 present in SearchVisitorImpl relating to fairness which is sometimes more |
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35 important than speed.</p> |
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36 */ |
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37 class FifoSearchVisitorImpl implements SingleMatchTask, |
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38 SearchVisitor { |
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39 |
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40 private static final Logger theLogger = |
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41 Logging.newLogger("org.dancres.blitz.entry.FifoSearchVisitorImpl"); |
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42 |
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43 private MangledEntry theTemplate; |
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44 private TxnState theTxnState; |
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45 private boolean isTaking; |
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46 |
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47 private EventGeneratorImpl theSearchTask; |
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48 private SearchVisitor theAdapter = new SearchVisitorAdapter(); |
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49 private BaulkedParty theParty; |
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50 |
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51 private int theLockOp; |
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52 |
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53 private boolean needsWakeup = false; |
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54 |
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55 private CompletionEvent theCompletion; |
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56 |
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57 private long theStartTime = System.currentTimeMillis(); |
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58 |
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59 private LinkedList theNewWrites = new LinkedList(); |
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60 |
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61 /** |
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62 @param isTake indicates the kind of txn lock we would need to assert |
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63 */ |
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64 FifoSearchVisitorImpl(MangledEntry aTemplate, boolean isTake, |
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65 TxnState aState, VisitorBaulkedPartyFactory aFactory) |
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66 throws IOException { |
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67 |
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68 theTemplate = aTemplate; |
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69 isTaking = isTake; |
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70 theTxnState = aState; |
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71 theLockOp = (isTaking == true) ? TxnLock.DELETE : TxnLock.READ; |
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72 theSearchTask = new EventGeneratorImpl(aTemplate); |
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73 theParty = aFactory.newParty(this); |
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74 SearchTasks.get().add(this); |
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75 EventQueue.get().insert(theSearchTask); |
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76 } |
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77 |
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78 public EventGenerator getSearchTask() { |
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79 return theSearchTask; |
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80 } |
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81 |
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82 public SearchVisitor getVisitor() { |
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83 return theAdapter; |
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84 } |
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85 |
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86 /*********************************************************************** |
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87 * SearchVisitor |
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88 ***********************************************************************/ |
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89 |
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90 public int offer(SearchOffer anOffer) { |
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91 OpInfo myInfo = anOffer.getInfo(); |
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92 |
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93 MangledEntry myEntry = anOffer.getEntry(); |
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94 |
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95 LockMgr myMgr = TxnLocks.getLockMgr(myInfo.getType()); |
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96 TxnLock myLock = myMgr.getLock(myInfo.getOID()); |
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97 |
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98 synchronized (this) { |
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99 |
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100 int myResult; |
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101 |
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102 // Do we need to try and secure this? |
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103 if (haveCompleted()) |
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104 return STOP; |
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105 |
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106 VisitorBaulkedPartyFactory.Handback myHandback = |
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107 new VisitorBaulkedPartyFactory.Handback(myInfo.getType(), |
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108 myInfo.getOID(), myEntry); |
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109 |
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110 synchronized (myLock) { |
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111 myResult = myLock.acquire(theTxnState, theLockOp, |
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112 theParty, myHandback, false); |
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113 } |
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114 |
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115 if (myResult == TxnLock.SUCCESS) { |
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116 |
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117 try { |
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118 theTxnState.add(new EntryTxnOp(theLockOp, myInfo, |
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119 myLock)); |
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120 } catch (TransactionException aTE) { |
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121 myLock.release(theTxnState, theLockOp); |
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122 return sendEvent(new CompletionEvent(aTE)); |
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123 } |
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124 |
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125 if (theLogger.isLoggable(Level.FINE)) |
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126 theLogger.log(Level.FINE, "Succeeded"); |
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127 |
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128 return sendEvent(new CompletionEvent(myEntry)); |
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129 } |
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130 } |
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131 |
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132 return TRY_AGAIN; |
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133 } |
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134 |
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135 public int sendEvent(CompletionEvent anEvent) { |
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136 synchronized(this) { |
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137 if (haveCompleted()) |
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138 return STOP; |
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139 |
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140 theCompletion = anEvent; |
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141 |
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142 theSearchTask.taint(); |
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143 SearchTasks.get().remove(this, wasNotSatisfied()); |
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144 |
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145 if (needsWakeup) |
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146 notify(); |
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147 |
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148 return STOP; |
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149 } |
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150 } |
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151 |
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152 public MangledEntry getEntry(long aTimeout) |
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153 throws TransactionException, |
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154 InterruptedException { |
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155 |
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156 synchronized(this) { |
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157 needsWakeup = true; |
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158 } |
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159 |
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160 while (true) { |
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161 synchronized(this) { |
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162 /* |
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163 If we've completed, throw exception or return Entry |
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164 accordingly, cleaning up state appropriately |
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165 */ |
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166 if (haveCompleted()) { |
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167 |
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168 // We're returning - ensure we don't allow any more |
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169 // operations to avoid doing a take we'll never return. |
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170 // |
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171 needsWakeup = false; |
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172 |
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173 if (theCompletion.getException() != null) |
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174 throw theCompletion.getException(); |
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175 |
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176 return theCompletion.getEntry(); |
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177 } |
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178 |
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179 // We haven't completed, yet, can we process queue elements? |
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180 if (theNewWrites.size() == 0) { |
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181 |
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182 long myRemaining = aTimeout - (System.currentTimeMillis() - |
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183 theStartTime); |
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184 |
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185 // Is there more time to wait? |
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186 if (myRemaining > 0) |
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187 wait(myRemaining); |
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188 else { |
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189 // No, force exit |
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190 needsWakeup = false; |
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191 sendEvent(CompletionEvent.COMPLETED); |
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192 } |
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193 } |
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194 } |
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195 |
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196 // We must flush the queue outside of lock |
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197 try { |
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198 flushQueue(); |
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199 } catch (IOException anIOE) { |
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200 TransactionException myTE = |
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201 new TransactionException("I/O Error whilst processing queue"); |
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202 myTE.initCause(anIOE); |
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203 sendEvent(new CompletionEvent(myTE)); |
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204 } |
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205 } |
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206 } |
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207 |
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208 private void flushQueue() throws IOException { |
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209 while (true) { |
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210 // Something has caused us to stop, give up now |
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211 // |
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212 if (haveCompleted()) |
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213 break; |
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214 |
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215 SpaceEntryUID myUID = null; |
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216 |
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217 synchronized(this) { |
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218 if (theNewWrites.size() != 0) { |
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219 myUID = (SpaceEntryUID) theNewWrites.removeFirst(); |
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220 } |
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221 } |
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222 |
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223 // Nothing else in queue? |
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224 // |
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225 if (myUID == null) |
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226 break; |
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227 |
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228 EntryRepository myRepos = |
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229 EntryRepositoryFactory.get().find(myUID.getType()); |
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230 |
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231 myRepos.find(this, myUID.getOID(), null); |
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232 } |
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233 } |
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234 |
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235 public synchronized boolean wouldBlock() { |
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236 return (theCompletion == null); |
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237 } |
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238 |
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239 private synchronized boolean haveCompleted() { |
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240 return (theCompletion != null); |
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241 } |
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242 |
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243 private boolean wasNotSatisfied() { |
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244 return (theCompletion.getEntry() == null); |
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245 } |
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246 |
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247 public boolean isDeleter() { |
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248 return isTaking; |
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249 } |
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250 |
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251 private void resolved() { |
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252 sendEvent(new CompletionEvent(new TransactionException( |
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253 "Transaction completed with operations still outstanding: " + |
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254 (isTaking ? "take" : "read")))); |
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255 } |
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256 |
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257 private class SearchVisitorAdapter implements SearchVisitor { |
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258 |
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259 public boolean isDeleter() { |
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260 return FifoSearchVisitorImpl.this.isDeleter(); |
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261 } |
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262 |
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263 public int offer(SearchOffer anOffer) { |
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264 if (theLogger.isLoggable(Level.FINE)) |
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265 theLogger.log(Level.FINE, "Offer"); |
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266 |
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267 synchronized (FifoSearchVisitorImpl.this) { |
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268 if (haveCompleted()) { |
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269 if (theLogger.isLoggable(Level.FINE)) |
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270 theLogger.log(Level.FINE, theTxnState.getId() + |
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271 " Have completed"); |
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272 return STOP; |
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273 } |
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274 } |
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275 |
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276 OpInfo myInfo = anOffer.getInfo(); |
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277 |
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278 if (!Types.isSubtype(theTemplate.getType(), myInfo.getType())) { |
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279 if (theLogger.isLoggable(Level.FINE)) |
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280 theLogger.log(Level.FINE, "Not subtype"); |
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281 |
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282 return TRY_AGAIN; |
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283 } |
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284 |
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285 MangledEntry myEntry = anOffer.getEntry(); |
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286 |
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287 if (theTemplate.match(myEntry)) { |
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288 return FifoSearchVisitorImpl.this.offer(anOffer); |
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289 } else |
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290 return TRY_AGAIN; |
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291 } |
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292 } |
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293 |
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294 private class EventGeneratorImpl implements EventGenerator { |
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295 private boolean isTainted = false; |
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296 private MangledEntry theTemplate; |
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297 private OID theOID; |
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298 |
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299 EventGeneratorImpl(MangledEntry aTemplate) { |
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300 theTemplate = aTemplate; |
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301 } |
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302 |
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303 public void assign(OID anOID) { |
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304 theOID = anOID; |
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305 } |
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306 |
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307 public long getStartSeqNum() { |
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308 return 0; |
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309 } |
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310 |
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311 public OID getId() { |
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312 return theOID; |
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313 } |
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314 |
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315 public boolean isPersistent() { |
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316 return false; |
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317 } |
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318 |
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319 public long getSourceId() { |
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320 return 0; |
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321 } |
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322 |
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323 public void taint() { |
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324 synchronized (this) { |
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325 // Tainting can only be done once |
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326 // |
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327 if (isTainted) |
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328 return; |
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329 |
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330 isTainted = true; |
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331 } |
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332 |
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333 try { |
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334 EventQueue.get().kill(getId()); |
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335 } catch (IOException anIOE) { |
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336 theLogger.log(Level.SEVERE, |
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337 "Encountered IOException during kill", anIOE); |
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338 } |
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339 |
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340 /* |
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341 try { |
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342 Tasks.queue(new CleanTask(getId())); |
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343 } catch (InterruptedException anIE) { |
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344 theLogger.log(Level.WARNING, |
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345 "Failed to lodge cleanup for: " + getId(), anIE); |
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346 } |
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347 */ |
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348 } |
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349 |
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350 private boolean isTainted() { |
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351 synchronized (this) { |
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352 return (isTainted); |
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353 } |
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354 } |
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355 |
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356 public boolean canSee(QueueEvent anEvent, long aTime) { |
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357 if (isTainted()) |
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358 return false; |
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359 |
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360 // Check if it's txn_ended and my txn and call resolved if it is |
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361 if ((anEvent.getType() == QueueEvent.TRANSACTION_ENDED) && |
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362 (theTxnState.getId().equals(anEvent.getTxn().getId()))) { |
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363 resolved(); |
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364 return false; |
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365 } |
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366 |
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367 // We want to see new writes from a transaction |
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368 // |
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369 return (anEvent.getType() == QueueEvent.ENTRY_WRITE); |
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370 } |
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371 |
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372 public boolean matches(MangledEntry anEntry) { |
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373 if (isTainted()) |
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374 return false; |
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375 |
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376 return Types.isSubtype(theTemplate.getType(), anEntry.getType()) && |
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377 theTemplate.match(anEntry); |
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378 } |
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379 |
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380 public boolean renew(long aTime) { |
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381 // Nothing to do as we expire by being tainted by the enclosing |
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382 // class only |
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383 // |
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384 return true; |
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385 } |
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386 |
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387 public void recover(long aSeqNum) { |
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388 // Nothing to do |
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389 } |
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390 |
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391 public long jumpSequenceNumber() { |
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392 return 0; |
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393 } |
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394 |
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395 public long jumpSequenceNumber(long aMin) { |
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396 return 0; |
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397 } |
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398 |
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399 public void ping(QueueEvent anEvent, JavaSpace aSource) { |
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400 /* |
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401 Queue the write for later consideration unless we're done. |
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402 Later consideration will only be after we've invoked getEntry |
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403 which will only occur after we've performed searching of storage |
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404 */ |
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405 synchronized (FifoSearchVisitorImpl.this) { |
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406 if (haveCompleted()) |
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407 return; |
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408 |
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409 QueueEvent.Context myContext = anEvent.getContext(); |
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410 MangledEntry myEntry = myContext.getEntry(); |
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411 OID myOID = myContext.getOID(); |
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412 |
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413 theNewWrites.add(new SpaceEntryUID(myEntry.getType(), myOID)); |
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414 |
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415 if (needsWakeup) |
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416 FifoSearchVisitorImpl.this.notify(); |
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417 } |
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418 } |
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419 |
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420 public EventGeneratorState getMemento() { |
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421 throw new RuntimeException( |
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422 "Shouldn't be happening - we're transient"); |
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423 } |
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424 } |
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425 } |