Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/remote/txn/LoopBackMgr.java @ 32:243c74d599bf
Update ignores
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:41:47 +0100 |
parents | 3dc0c5604566 |
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rev | line source |
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0
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1 package org.dancres.blitz.remote.txn; |
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2 |
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3 import java.rmi.RemoteException; |
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4 import java.util.HashMap; |
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5 import java.util.logging.Logger; |
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6 import java.util.logging.Level; |
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7 |
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8 import net.jini.core.transaction.server.ServerTransaction; |
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9 import net.jini.core.transaction.server.TransactionManager; |
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10 import net.jini.core.transaction.*; |
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11 import net.jini.core.lease.LeaseDeniedException; |
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12 import net.jini.config.ConfigurationException; |
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13 |
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14 import org.dancres.blitz.txn.TxnManager; |
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15 import org.dancres.blitz.txn.TxnState; |
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16 import org.dancres.blitz.util.Time; |
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17 import org.dancres.blitz.lease.LeaseBounds; |
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18 import org.dancres.blitz.lease.Reapable; |
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19 import org.dancres.blitz.lease.ReapFilter; |
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20 import org.dancres.blitz.lease.LeaseReaper; |
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21 import org.dancres.blitz.Logging; |
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22 import org.dancres.blitz.config.ConfigurationFactory; |
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23 |
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24 /** |
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25 */ |
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26 public class LoopBackMgr implements Reapable { |
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27 |
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28 private static Logger theLogger = |
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29 Logging.newLogger("org.dancres.blitz.remote.txn.LoopBackMgr"); |
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30 |
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31 /** |
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32 * This will need updating based on reading the log or reading |
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33 * from checkpoint or both! NO IT WON'T we simply won't log these - they |
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34 * either complete or they don't - they're one operation wonders which |
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35 * don't need logging. |
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36 */ |
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37 private long theNextKey = 0; |
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38 private long theMagic = System.currentTimeMillis(); |
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39 |
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40 private LeaseReaper theReaper; |
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41 |
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42 /** |
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43 * Keeps track of transactions we have active in the core. We hold lease |
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44 * state here. |
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45 */ |
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46 private HashMap theActiveTxns = new HashMap(); |
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47 |
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48 private TransactionManager theStub; |
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49 |
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50 private static LoopBackMgr theMgr; |
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51 |
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52 static void init(TransactionManager aStub) { |
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53 theMgr = new LoopBackMgr(aStub); |
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54 } |
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55 |
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56 static LoopBackMgr get() { |
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57 return theMgr; |
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58 } |
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59 |
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60 private LoopBackMgr(TransactionManager aStub) { |
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61 try { |
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62 long myReapInterval = |
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63 ((Long) ConfigurationFactory.getEntry("loopbackTxnReapInterval", |
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64 long.class, |
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65 new Long(5 * 60 * 1000))).longValue(); |
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66 theReaper = new LeaseReaper("LoopbackTxn", null, myReapInterval); |
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67 |
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68 theReaper.add(this); |
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69 |
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70 } catch (ConfigurationException aCE) { |
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71 theLogger.log(Level.SEVERE, "Failed to load config", aCE); |
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72 } |
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73 |
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74 theStub = aStub; |
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75 } |
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76 |
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77 private long nextId() { |
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78 synchronized (this) { |
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79 return theNextKey++; |
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80 } |
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81 } |
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82 |
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83 public TxnTicket create(long aLeaseTime) |
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84 throws LeaseDeniedException, RemoteException { |
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85 |
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86 long myLeaseTime = |
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87 Time.getAbsoluteTime(LeaseBounds.boundTxn(aLeaseTime)); |
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88 |
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89 long myId = nextId(); |
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90 |
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91 SpaceTxnUID myUID = new SpaceTxnUID(myId, theMagic); |
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92 |
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93 TxnDetails myDetails = new TxnDetails(myLeaseTime); |
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94 |
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95 ServerTransaction myTxn = new ServerTransaction(theStub, myId); |
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96 |
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97 try { |
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98 // Insert the transaction |
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99 // |
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100 TxnManager.get().getTxnFor(myTxn, false); |
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101 } catch (Exception anE) { |
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102 theLogger.log(Level.SEVERE, "Failed to allocate loopback txn", anE); |
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103 throw new LeaseDeniedException("Couldn't allocate txn"); |
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104 } |
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105 |
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106 synchronized(this) { |
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107 theActiveTxns.put(myUID, myDetails); |
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108 } |
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109 |
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110 return new TxnTicket(myUID, myLeaseTime); |
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111 } |
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112 |
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113 private SpaceTxnUID validateTxn(long anId) |
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114 throws UnknownTransactionException { |
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115 |
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116 SpaceTxnUID myUID = new SpaceTxnUID(anId, theMagic); |
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117 |
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118 synchronized (this) { |
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119 TxnDetails myDetails = (TxnDetails) theActiveTxns.get(myUID); |
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120 |
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121 if ((myDetails == null) || |
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122 (myDetails.hasExpired(System.currentTimeMillis()))) |
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123 throw new UnknownTransactionException(); |
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124 } |
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125 |
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126 return myUID; |
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127 } |
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128 |
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129 public void commit(long id) |
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130 throws UnknownTransactionException, CannotCommitException, |
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131 RemoteException { |
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132 |
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133 SpaceTxnUID myUID = validateTxn(id); |
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134 |
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135 TxnManager myMgr = TxnManager.get(); |
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136 |
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137 TxnState myState = myMgr.getTxnFor(theStub, id); |
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138 |
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139 try { |
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140 myMgr.prepareAndCommit(myState); |
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141 } finally { |
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142 synchronized (this) { |
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143 theActiveTxns.remove(myUID); |
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144 } |
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145 } |
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146 } |
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147 |
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148 public void commit(long id, long waitFor) |
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149 throws UnknownTransactionException, CannotCommitException, |
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150 TimeoutExpiredException, RemoteException { |
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151 |
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152 commit(id); |
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153 } |
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154 |
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155 public void abort(long id) |
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156 throws UnknownTransactionException, CannotAbortException, |
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157 RemoteException { |
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158 |
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159 SpaceTxnUID myUID = validateTxn(id); |
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160 |
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161 TxnManager myMgr = TxnManager.get(); |
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162 |
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163 TxnState myState = myMgr.getTxnFor(theStub, id); |
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164 |
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165 try { |
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166 myMgr.abort(myState); |
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167 } finally { |
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168 synchronized(this) { |
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169 theActiveTxns.remove(myUID); |
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170 } |
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171 } |
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172 } |
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173 |
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174 public void abort(long id, long waitFor) |
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175 throws UnknownTransactionException, CannotAbortException, |
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176 TimeoutExpiredException, RemoteException { |
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177 |
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178 abort(id); |
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179 } |
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180 |
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181 boolean renew(SpaceTxnUID aUID, long anExpiry) { |
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182 synchronized (this) { |
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183 TxnDetails myHolder = (TxnDetails) theActiveTxns.get(aUID); |
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184 |
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185 if (myHolder != null) { |
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186 return myHolder.testAndSetExpiry(System.currentTimeMillis(), |
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187 anExpiry); |
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188 } |
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189 |
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190 return false; |
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191 } |
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192 } |
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193 |
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194 boolean cancel(SpaceTxnUID aUID) { |
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195 return (delete(aUID) != null); |
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196 } |
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197 |
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198 |
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199 public TxnDetails delete(SpaceTxnUID aUID) { |
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200 |
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201 synchronized (this) { |
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202 TxnDetails myHolder = (TxnDetails) theActiveTxns.remove(aUID); |
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203 |
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204 if (myHolder != null) { |
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205 try { |
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206 TxnState myState = |
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207 TxnManager.get().getTxnFor(theStub, aUID.getId()); |
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208 |
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209 TxnManager.get().abort(myState); |
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210 } catch (Exception anE) { |
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211 // Nothing we cn do |
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212 } |
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213 |
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214 return myHolder; |
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215 } |
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216 |
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217 return null; |
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218 } |
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219 } |
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220 |
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221 public void reap(ReapFilter aFilter) { |
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222 /* |
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223 No reap filters will be configured so we can ignore those - see |
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224 initialization in constructor |
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225 */ |
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226 long myTime = System.currentTimeMillis(); |
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227 |
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228 Object[] myKeys; |
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229 |
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230 synchronized (this) { |
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231 myKeys = theActiveTxns.keySet().toArray(); |
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232 } |
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233 |
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234 for (int i = 0; i < myKeys.length; i++) { |
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235 TxnDetails myHolder = |
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236 (TxnDetails) theActiveTxns.get(myKeys[i]); |
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237 |
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238 if (myHolder.hasExpired(myTime)) { |
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239 delete((SpaceTxnUID) myKeys[i]); |
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240 } |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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241 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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242 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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243 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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244 public String toString() { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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245 return "LoopBackMgr"; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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246 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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247 |
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Dan Creswell <dan.creswell@gmail.com>
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248 public int hashCode() { |
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249 return 4095; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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250 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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251 |
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252 public boolean equals(Object anObject) { |
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253 if (anObject instanceof LoopBackMgr) |
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254 return true; |
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255 else |
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256 return false; |
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Dan Creswell <dan.creswell@gmail.com>
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257 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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258 } |