Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/EntryViewImpl.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 net.jini.core.transaction.Transaction; |
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6 import net.jini.core.transaction.TransactionException; |
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7 import net.jini.core.transaction.UnknownTransactionException; |
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8 |
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9 import org.dancres.blitz.entry.*; |
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10 import org.dancres.blitz.mangler.MangledEntry; |
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11 import org.dancres.blitz.txn.TxnManager; |
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12 import org.dancres.blitz.txn.TxnState; |
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13 import org.dancres.blitz.txnlock.LockMgr; |
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14 import org.dancres.blitz.txnlock.TxnLock; |
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15 import org.dancres.blitz.txnlock.TxnLocks; |
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16 import org.dancres.blitz.notify.EventQueue; |
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17 |
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18 /** |
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19 <p>This class supports both iteration using the old JavaSpaceAdmin interface |
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20 and the new JavaSpace05 interface. The key differences amount to the |
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21 the number of templates that can be passed and whether or not locks are |
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22 held on the transaction.</p> |
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23 |
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24 <p>For JavaSpace05, there are multiple templates and we hold locks on the |
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25 transaction.</p> |
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26 */ |
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27 class EntryViewImpl implements EntryView { |
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28 private TxnState theTxn; |
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29 |
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30 private TransactionException theException; |
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31 private int theStatus = ACTIVE; |
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32 |
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33 private static final int ACTIVE = -1; |
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34 private static final int DECEASED = -2; |
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35 |
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36 private UIDSet theUIDs; |
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37 |
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38 private NewView theDynamicView; |
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39 |
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40 private EntryRx theBuffer; |
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41 |
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42 private boolean shouldUpdate; |
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43 |
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44 EntryViewImpl(Transaction aTxn, MangledEntry[] aTemplates, |
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45 boolean holdLocks, boolean doUpdate, long aLimit) |
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46 throws TransactionException, IOException { |
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47 |
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48 shouldUpdate = doUpdate; |
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49 |
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50 theTxn = TxnManager.get().resolve(aTxn); |
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51 |
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52 /* |
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53 Basic process is to assemble a set of fully matching Entry UID's which we |
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54 then step through ascertaining whether these UID's are still valid and possibly |
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55 asserting locks transactionally. |
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56 |
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57 Full matching is done in each view and the matching tuples are then |
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58 logged/merged in the UIDSet |
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59 |
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60 These tuple ids are then scanned through using EntryReposImpl::find to load |
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61 the entry, verify it's valid etc after which we may or may not maintain a |
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62 transaction lock (these steps are done in EntryRx). |
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63 */ |
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64 theUIDs = new UIDSet(aLimit); |
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65 |
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66 theBuffer = new EntryRx(theTxn, holdLocks); |
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67 theDynamicView = new NewView(this, aTemplates, theUIDs); |
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68 |
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69 if (shouldUpdate) |
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70 EventQueue.get().insert(theDynamicView.getSearchTask()); |
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71 |
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72 /* |
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73 For each template do a full tree search and assemble all matches |
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74 */ |
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75 for (int i = 0; i < aTemplates.length; i++) { |
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76 if (theUIDs.isFull()) |
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77 break; |
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78 |
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79 DiskView myFixedView = new DiskView(aTemplates[i], theUIDs); |
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80 |
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81 EntryRepository myRepos = |
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82 EntryRepositoryFactory.get().find(aTemplates[i].getType()); |
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83 |
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84 if (myRepos != null) { |
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85 myRepos.find(aTemplates[i], myFixedView); |
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86 |
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87 // Try subtypes |
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88 String[] mySubtypes = myRepos.getSubtypes(); |
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89 |
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90 for (int j = 0; j < mySubtypes.length; j++) { |
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91 myRepos = EntryRepositoryFactory.get().find(mySubtypes[j]); |
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92 |
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93 if (myRepos != null) { |
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94 myRepos.find(aTemplates[i], myFixedView); |
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95 } |
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96 } |
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97 } |
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98 } |
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99 } |
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100 |
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101 TxnState getTxn() { |
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102 return theTxn; |
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103 } |
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104 |
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105 void resolved() { |
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106 setStatus(DECEASED, |
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107 new TransactionException( |
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108 "Transaction closed with view active")); |
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109 } |
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110 |
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111 private void setStatus(int aStatus, TransactionException aTE) { |
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112 // Make sure we only do this once |
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113 // |
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114 synchronized(this) { |
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115 if (theStatus == DECEASED) |
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116 return; |
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117 |
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118 theStatus = aStatus; |
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119 theException = aTE; |
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120 } |
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121 |
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122 if (shouldUpdate) |
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123 theDynamicView.getSearchTask().taint(); |
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124 |
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125 if (theTxn.isNull()) { |
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126 try { |
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127 TxnManager.get().prepareAndCommit(theTxn); |
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128 } catch (UnknownTransactionException aUTE) { |
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129 /* |
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130 Don't care much...if we got here, we're defining state |
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131 and everyone else will fail at the status test above |
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132 */ |
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133 synchronized(this) { |
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134 theException = aUTE; |
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135 } |
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136 } |
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137 } |
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138 } |
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139 |
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140 public void close() { |
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141 setStatus(DECEASED, null); |
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142 } |
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143 |
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144 public EntryChit next() throws TransactionException, IOException { |
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145 synchronized(this) { |
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146 if (theStatus == DECEASED) { |
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147 if (theException != null) |
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148 throw theException; |
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149 else |
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150 throw new TransactionException("No longer active"); |
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151 } |
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152 } |
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153 |
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154 SpaceEntryUID myUID; |
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155 |
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156 while ((myUID = theUIDs.pop()) != null) { |
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157 EntryRepository myRepos = |
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158 EntryRepositoryFactory.get().get(myUID.getType()); |
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159 |
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160 myRepos.find(theBuffer, myUID.getOID(), null); |
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161 |
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162 MangledEntry myEntry = theBuffer.getEntry(); |
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163 |
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164 if (myEntry != null) |
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165 return new EntryChit(myEntry, myUID); |
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166 } |
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167 |
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168 return null; |
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169 } |
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170 |
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171 /** |
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172 Used to receive the entry requested by id from the EntryRepository |
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173 It performs the appropriate locking checks and updates the transaction |
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174 if we're holding locks |
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175 */ |
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176 private static class EntryRx implements SearchVisitor { |
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177 private MangledEntry theEntry; |
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178 |
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179 private TxnState theTxn; |
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180 private boolean keepLock; |
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181 |
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182 private TransactionException theFailure; |
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183 |
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184 EntryRx(TxnState aTxn, boolean holdLock) { |
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185 theTxn = aTxn; |
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186 keepLock = holdLock; |
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187 } |
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188 |
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189 public int offer(SearchOffer anOffer) { |
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190 OpInfo myInfo = anOffer.getInfo(); |
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191 |
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192 // Try the lock |
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193 LockMgr myMgr = TxnLocks.getLockMgr(myInfo.getType()); |
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194 TxnLock myLock = myMgr.getLock(myInfo.getOID()); |
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195 |
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196 int myResult; |
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197 |
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198 synchronized(myLock) { |
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199 myResult = myLock.acquire(theTxn, TxnLock.READ, |
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200 null, null, false); |
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201 } |
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202 |
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203 if (myResult == TxnLock.SUCCESS) { |
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204 if (keepLock) { |
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205 /* |
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206 Need to track the lock under the transaction |
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207 */ |
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208 try { |
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209 theTxn.add(new EntryTxnOp(TxnLock.READ, myInfo, |
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210 myLock)); |
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211 } catch (TransactionException aTE) { |
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212 myLock.release(theTxn, TxnLock.READ); |
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213 theFailure = aTE; |
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214 return STOP; |
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215 } |
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216 } else { |
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217 /* |
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218 No need to track this lock, we were just testing so |
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219 we can release it now |
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220 */ |
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221 myLock.release(theTxn, TxnLock.READ); |
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222 } |
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223 |
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224 theEntry = anOffer.getEntry(); |
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225 } |
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226 |
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227 return STOP; |
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228 } |
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229 |
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230 public boolean isDeleter() { |
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231 return false; |
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232 } |
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233 |
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234 MangledEntry getEntry() throws TransactionException { |
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235 /* |
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236 If we're running under an external (non-null) transaction |
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237 we may have failed whilst attempting to lock (we would have |
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238 failed to record the lock in the transaction). |
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239 */ |
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240 if (theFailure != null) |
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241 throw theFailure; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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242 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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243 MangledEntry myResult = theEntry; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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244 theEntry = null; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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245 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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246 return myResult; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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247 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
248 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
249 } |