Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/BulkTakeVisitor.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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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.ArrayList; |
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6 import java.util.List; |
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7 |
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8 import java.util.logging.*; |
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9 |
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10 import net.jini.core.transaction.TransactionException; |
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11 import net.jini.space.JavaSpace; |
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12 |
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13 import org.dancres.blitz.mangler.MangledEntry; |
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14 |
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15 import org.dancres.blitz.entry.*; |
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16 |
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17 import org.dancres.blitz.txn.TxnState; |
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18 |
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19 import org.dancres.blitz.txnlock.*; |
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20 |
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21 import org.dancres.blitz.oid.OID; |
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22 |
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23 import org.dancres.blitz.notify.EventGenerator; |
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24 import org.dancres.blitz.notify.EventQueue; |
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25 import org.dancres.blitz.notify.QueueEvent; |
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26 import org.dancres.blitz.notify.EventGeneratorState; |
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27 |
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28 class BulkTakeVisitor implements BulkMatchTask, SearchVisitor { |
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29 private static final Logger theLogger = |
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30 Logging.newLogger("org.dancres.blitz.BulkTakeVisitor"); |
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31 |
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32 private MangledEntry[] theTemplates; |
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33 private TxnState theTxnState; |
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34 private long theLimit; |
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35 private EventGeneratorImpl theSearchTask; |
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36 private SearchVisitorAdapter theAdapter = new SearchVisitorAdapter(); |
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37 private BaulkedParty theParty; |
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38 |
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39 private ArrayList theEntries = new ArrayList(); |
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40 |
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41 private int theStatus = SearchVisitor.TRY_AGAIN; |
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42 |
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43 private TransactionException theException; |
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44 |
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45 private boolean needsWakeup = false; |
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46 |
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47 BulkTakeVisitor(MangledEntry[] aTemplates, TxnState aTxnState, |
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48 long aLimit, VisitorBaulkedPartyFactory aFactory) |
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49 throws IOException { |
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50 |
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51 theTemplates = aTemplates; |
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52 theTxnState = aTxnState; |
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53 theLimit = aLimit; |
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54 theSearchTask = new EventGeneratorImpl(theTemplates); |
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55 theParty = aFactory.newParty(this); |
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56 SearchTasks.get().add(this); |
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57 EventQueue.get().insert(theSearchTask); |
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58 } |
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59 |
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60 private void resolved() { |
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61 setStatus(STOP, new TransactionException()); |
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62 } |
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63 |
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64 public SearchVisitor getVisitor() { |
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65 return theAdapter; |
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66 } |
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67 |
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68 public int offer(SearchOffer anOffer) { |
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69 theLogger.log(Level.FINE, "offer"); |
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70 |
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71 synchronized(this) { |
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72 if (haveCompleted()) { |
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73 theLogger.log(Level.FINE, "Have completed"); |
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74 return STOP; |
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75 } |
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76 } |
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77 |
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78 OpInfo myInfo = anOffer.getInfo(); |
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79 MangledEntry myEntry = anOffer.getEntry(); |
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80 |
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81 LockMgr myMgr = TxnLocks.getLockMgr(myInfo.getType()); |
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82 TxnLock myLock = myMgr.getLock(myInfo.getOID()); |
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83 |
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84 synchronized (this) { |
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85 int myResult; |
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86 |
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87 // Picked up enough matches in the meantime? Quit... |
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88 if (haveCompleted()) |
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89 return STOP; |
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90 |
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91 VisitorBaulkedPartyFactory.Handback myHandback = |
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92 new VisitorBaulkedPartyFactory.Handback(myInfo.getType(), |
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93 myInfo.getOID(), myEntry); |
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94 |
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95 synchronized (myLock) { |
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96 myResult = myLock.acquire(theTxnState, |
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97 TxnLock.DELETE, |
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98 theParty, myHandback, false); |
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99 } |
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100 |
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101 if (myResult == TxnLock.SUCCESS) { |
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102 // Got the lock |
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103 try { |
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104 theTxnState.add(new EntryTxnOp(TxnLock.DELETE, |
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105 myInfo, |
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106 myLock)); |
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107 } catch (TransactionException aTE) { |
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108 synchronized (myLock) { |
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109 myLock.release(theTxnState, TxnLock.DELETE); |
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110 } |
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111 return setStatus(STOP, aTE); |
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112 } |
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113 |
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114 // Add the Entry to our list of matches |
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115 theEntries.add(myEntry); |
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116 |
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117 /* |
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118 Picked up enough matches? Quit else carry on |
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119 */ |
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120 if (haveCompleted()) |
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121 return setStatus(STOP, null); |
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122 else |
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123 return TRY_AGAIN; |
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124 } else { |
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125 /* |
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126 One of our templates matched but we didn't |
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127 get a lock. No point in trying other templates |
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128 because even if they match we might get another |
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129 conflict. We'll leave it to settle instead and |
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130 look for other matches. |
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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 } |
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136 |
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137 public boolean isDeleter() { |
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138 return true; |
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139 } |
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140 |
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141 private boolean haveCompleted() { |
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142 /* |
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143 If we're blocking, then we'll unblock as soon as we get one |
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144 match, otherwise, we want to be greedy and grab as many entries |
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145 as our limit allows |
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146 */ |
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147 if (needsWakeup) { |
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148 return (theEntries.size() != 0) || (theStatus == STOP); |
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149 } else { |
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150 return (theEntries.size() == theLimit) || (theStatus == STOP); |
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151 } |
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152 } |
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153 |
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154 public synchronized List getEntries(long aTimeout) |
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155 throws TransactionException, InterruptedException { |
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156 |
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157 // We only wait the once because we'll only ever wake from this |
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158 // if there's a result or we timeout |
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159 if ((theEntries.size() == 0) && (aTimeout != 0)) { |
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160 needsWakeup = true; |
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161 wait(aTimeout); |
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162 needsWakeup = false; |
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163 } |
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164 |
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165 // We're returning - ensure we don't allow any more operations to |
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166 // avoid doing a take we'll never return.... |
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167 setStatus(STOP, null); |
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168 |
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169 if (theException != null) |
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170 throw theException; |
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171 |
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172 return theEntries; |
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173 } |
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174 |
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175 /** |
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176 We're greedy and always want more if some might be available. |
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177 i.e. If we haven't got to the point where we've scanned the entire |
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178 space (in which case user should be calling wouldBlock()) we want more! |
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179 */ |
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180 public synchronized boolean wantsMore() { |
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181 return (theEntries.size() < theLimit); |
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182 } |
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183 |
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184 /** |
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185 We only request block if we have no entries. |
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186 */ |
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187 public synchronized boolean wouldBlock() { |
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188 return (theEntries.size() == 0); |
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189 } |
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190 |
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191 private boolean wasNotSatisfied() { |
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192 return (theEntries.size() == 0); |
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193 } |
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194 |
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195 private synchronized int setStatus(int aState, TransactionException aTE) { |
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196 /* |
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197 * Test only for STOP, do not use haveCompleted in this case |
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198 * which can declare us completed and cause us to axit before |
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199 * we actually set STOP. |
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200 */ |
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201 if (theStatus == STOP) |
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202 return STOP; |
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203 |
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204 theStatus = aState; |
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205 theException = aTE; |
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206 |
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207 theSearchTask.taint(false); |
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208 SearchTasks.get().remove(this, wasNotSatisfied()); |
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209 |
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210 if (needsWakeup) |
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211 notify(); |
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212 |
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213 return theStatus; |
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214 } |
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215 |
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216 private class EventGeneratorImpl implements EventGenerator { |
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217 private boolean isTainted = false; |
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218 private MangledEntry[] theTemplates; |
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219 private OID theOID; |
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220 |
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221 EventGeneratorImpl(MangledEntry[] aTemplates) { |
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222 theTemplates = aTemplates; |
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223 } |
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224 |
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225 public void assign(OID anOID) { |
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226 theOID = anOID; |
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227 } |
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228 |
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229 public long getStartSeqNum() { |
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230 return 0; |
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231 } |
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232 |
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233 public OID getId() { |
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234 return theOID; |
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235 } |
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236 |
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237 public boolean isPersistent() { |
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238 return false; |
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239 } |
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240 |
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241 public long getSourceId() { |
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242 return 0; |
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243 } |
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244 |
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245 void taint(boolean signal) { |
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246 synchronized (this) { |
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247 // Tainting can only be done once |
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248 // |
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249 if (isTainted) |
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250 return; |
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251 |
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252 isTainted = true; |
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253 } |
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254 |
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255 if (signal) |
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256 setStatus(STOP, new TransactionException("Destroyed")); |
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257 |
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258 try { |
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259 EventQueue.get().kill(getId()); |
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260 } catch (IOException anIOE) { |
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261 theLogger.log(Level.SEVERE, |
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262 "Encountered IOException during kill", anIOE); |
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263 } |
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264 |
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265 /* |
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266 try { |
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267 Tasks.queue(new CleanTask(getId())); |
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268 } catch (InterruptedException anIE) { |
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269 theLogger.log(Level.WARNING, |
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270 "Failed to lodge cleanup for: " + getId(), anIE); |
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271 } |
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272 */ |
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273 } |
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274 |
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275 public void taint() { |
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276 taint(true); |
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277 } |
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278 |
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279 public boolean canSee(QueueEvent anEvent, long aTime) { |
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280 synchronized (this) { |
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281 if (isTainted) { |
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282 return false; |
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283 } |
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284 } |
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285 |
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286 // Check if it's txn_ended and my txn and call resolved if it is |
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287 if ((anEvent.getType() == QueueEvent.TRANSACTION_ENDED) && |
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288 (theTxnState.getId().equals(anEvent.getTxn().getId()))) { |
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289 resolved(); |
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290 return false; |
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291 } |
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292 |
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293 // We want to see new writes from a transaction |
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294 // |
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295 return (anEvent.getType() == QueueEvent.ENTRY_WRITE); |
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296 } |
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297 |
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298 public boolean matches(MangledEntry anEntry) { |
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299 synchronized (this) { |
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300 if (isTainted) { |
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301 return false; |
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302 } |
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303 } |
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304 |
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305 for (int i = 0; i < theTemplates.length; i++) { |
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306 MangledEntry myTemplate = theTemplates[i]; |
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307 |
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308 if (Types.isSubtype(myTemplate.getType(), anEntry.getType())) { |
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309 if (myTemplate.match(anEntry)) |
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310 return true; |
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311 } |
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312 } |
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313 |
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314 return false; |
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315 } |
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316 |
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317 public boolean renew(long aTime) { |
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318 // Nothing to do as we expire by being tainted by the enclosing |
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319 // class only |
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320 // |
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321 return true; |
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322 } |
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323 |
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324 public void recover(long aSeqNum) { |
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325 // Nothing to do |
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326 } |
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327 |
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328 public long jumpSequenceNumber() { |
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329 return 0; |
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330 } |
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331 |
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332 public long jumpSequenceNumber(long aMin) { |
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333 return 0; |
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334 } |
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335 |
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336 public void ping(QueueEvent anEvent, JavaSpace aSource) { |
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337 synchronized (this) { |
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338 if (isTainted) { |
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339 return; |
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340 } |
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341 } |
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342 |
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343 LongtermOffer myOffer = null; |
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344 |
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345 try { |
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346 QueueEvent.Context myContext = anEvent.getContext(); |
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347 MangledEntry myEntry = myContext.getEntry(); |
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348 OID myOID = myContext.getOID(); |
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349 |
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350 EntryRepository myRepos = |
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351 EntryRepositoryFactory.get().find(myEntry.getType()); |
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352 |
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353 myOffer = myRepos.getOffer(myOID); |
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354 |
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355 if (myOffer == null) |
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356 return; |
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357 |
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358 myOffer.offer(BulkTakeVisitor.this); |
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359 |
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360 } catch (IOException anIOE) { |
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361 // Nothing can be done |
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362 theLogger.log(Level.SEVERE, |
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363 "Encountered IOException during write offer", anIOE); |
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364 } finally { |
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365 if (myOffer != null) { |
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366 try { |
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367 myOffer.release(); |
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368 } catch (IOException anIOE) { |
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369 theLogger.log(Level.SEVERE, |
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370 "Encountered IOException during write offer(release)", |
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371 anIOE); |
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372 } |
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373 } |
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374 } |
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375 } |
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376 |
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377 public EventGeneratorState getMemento() { |
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378 throw new RuntimeException( |
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379 "Shouldn't be happening - we're transient"); |
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380 } |
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381 } |
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382 |
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383 private class SearchVisitorAdapter implements SearchVisitor { |
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384 |
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385 public boolean isDeleter() { |
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386 return BulkTakeVisitor.this.isDeleter(); |
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387 } |
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388 |
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389 public int offer(SearchOffer anOffer) { |
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390 if (theLogger.isLoggable(Level.FINE)) |
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391 theLogger.log(Level.FINE, "Offer"); |
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392 |
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393 synchronized (this) { |
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394 if (haveCompleted()) { |
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395 theLogger.log(Level.FINE, "Have completed"); |
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396 return STOP; |
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397 } |
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398 } |
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399 |
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400 OpInfo myInfo = anOffer.getInfo(); |
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401 MangledEntry myEntry = anOffer.getEntry(); |
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402 |
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403 for (int i = 0; i < theTemplates.length; i++) { |
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404 MangledEntry myTemplate = theTemplates[i]; |
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405 |
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406 if (Types.isSubtype(myTemplate.getType(), myInfo.getType())) { |
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407 |
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408 if ((myTemplate.isWildcard()) || |
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409 (myTemplate.match(myEntry))) { |
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410 |
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411 // If we get a match, we only need to try offer |
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412 // once to see if we can lock the entry so we can |
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413 // give up after the first match & offer. |
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414 // |
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415 return BulkTakeVisitor.this.offer(anOffer); |
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416 } |
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417 } |
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418 } |
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419 |
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420 return TRY_AGAIN; |
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421 } |
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422 } |
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423 } |