Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/SpaceImpl.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.rmi.MarshalledObject; |
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6 |
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7 import java.util.List; |
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8 import java.util.ArrayList; |
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9 |
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10 import java.util.logging.*; |
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11 |
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12 import net.jini.core.event.RemoteEventListener; |
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13 |
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14 import net.jini.core.transaction.Transaction; |
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15 import net.jini.core.transaction.UnknownTransactionException; |
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16 import net.jini.core.transaction.TransactionException; |
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17 |
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18 import org.dancres.blitz.mangler.MangledEntry; |
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19 |
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20 import org.dancres.blitz.entry.EntryRepositoryFactory; |
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21 import org.dancres.blitz.entry.EntryRepository; |
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22 import org.dancres.blitz.entry.OpInfo; |
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23 |
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24 import org.dancres.blitz.disk.Disk; |
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25 import org.dancres.blitz.disk.DiskTxn; |
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26 |
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27 import org.dancres.blitz.oid.OID; |
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28 |
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29 import org.dancres.blitz.util.Time; |
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30 |
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31 import org.dancres.blitz.task.Tasks; |
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32 |
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33 import org.dancres.blitz.notify.EventQueue; |
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34 import org.dancres.blitz.notify.QueueEvent; |
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35 |
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36 import org.dancres.blitz.lease.SpaceUID; |
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37 import org.dancres.blitz.lease.LeaseBounds; |
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38 |
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39 import org.dancres.blitz.txn.TxnManager; |
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40 import org.dancres.blitz.txn.TxnState; |
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41 import org.dancres.blitz.txn.TxnGateway; |
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42 |
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43 import org.dancres.blitz.config.ConfigurationFactory; |
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44 import org.dancres.blitz.config.Fifo; |
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45 |
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46 import org.dancres.blitz.stats.StatsBoard; |
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47 import org.dancres.blitz.stats.Stat; |
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48 |
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49 /** |
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50 <p>The core back-end implementation of a space. </p> |
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51 |
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52 <p>One of the more subtle responsibilities of this class is that it handles |
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53 the negotiation of lease durations. This has implications for remote layers |
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54 etc. which should expect to pass down an unadulterated lease duration |
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55 (including <code>Lease.FOREVER</code> and <code>Lease.ANY</code>) and have |
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56 the space return the actual resultant lease time. This is true for |
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57 both initial writes of entry's or notify registrations and future |
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58 renews.</p> |
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59 |
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60 <p>Another responsibility of this class is to ensure that it only |
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61 returns <code>SpaceUID</code>s which are space-global unique identifiers. |
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62 There are a number of different resources managed by the space core which |
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63 each have their own locally unique identifiers. Thus the core wraps these |
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64 in appropriate <code>SpaceUID</code> implementations before returning |
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65 them.</p> |
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66 |
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67 <p>The various <code>SpaceUID</code> implementations can be used as the |
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68 target of lease renewal and cancel operations. Each implementation, |
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69 typically has it's own <code>LeaseHandler</code> implementation which is |
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70 registered with <code>LeaseHandlers</code> and has the renewal/cancel |
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71 operations delegated to it.</p> |
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72 |
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73 <p><code>Entry</code>s are managed by EntryRepository instances.</p> |
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74 |
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75 <p><code>notify</code>s are delegated to EventQueue.</p> |
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76 |
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77 @see org.dancres.blitz.lease.SpaceUID |
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78 @see org.dancres.blitz.lease.LeaseHandler |
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79 @see org.dancres.blitz.lease.LeaseHandlers |
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80 @see org.dancres.blitz.entry.EntryRepository |
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81 @see org.dancres.blitz.notify.EventQueue |
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82 */ |
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83 public class SpaceImpl { |
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84 |
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85 static final Logger theLogger = |
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86 Logging.newLogger("org.dancres.blitz.SpaceImpl", Level.INFO); |
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87 |
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88 private TxnControl theTxnController = new TxnControlImpl(); |
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89 private LeaseControl theLeaseController = new LeaseControlImpl(); |
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90 |
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91 private long theStartTime; |
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92 |
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93 private boolean isSynchronousNotify = false; |
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94 |
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95 public SpaceImpl(TxnGateway aGateway) throws Exception { |
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96 VersionInfo.dump(); |
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97 |
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98 theStartTime = System.currentTimeMillis(); |
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99 |
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100 long myDebugCycle = |
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101 ((Long) |
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102 ConfigurationFactory.getEntry("statsDump", |
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103 long.class, |
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104 new Long(0))).longValue(); |
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105 |
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106 isSynchronousNotify = ((Boolean) |
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107 ConfigurationFactory.getEntry("syncNotifyOnWrite", |
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108 boolean.class, |
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109 new Boolean(false))).booleanValue(); |
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110 |
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111 theLogger.info("Synchrounous Notifies: " + isSynchronousNotify); |
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112 |
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113 StatsDumper.start(myDebugCycle); |
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114 |
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115 TxnManager.init(aGateway); |
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116 |
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117 // Make sure EventQueue is hooked up |
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118 EventQueue.get(); |
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119 |
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120 // Activate threads etc. only after TxnManager is initialised so |
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121 // state has been recovered/is stable. |
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122 // |
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123 ActiveObjectRegistry.startAll(); |
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124 |
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125 // HACK: Ensure root repository is loaded because that publishes |
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126 // the known types stats (we shouldn't know this!) |
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127 EntryRepositoryFactory.get().get(EntryRepository.ROOT_TYPE); |
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128 } |
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129 |
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130 public WriteTicket write(MangledEntry anEntry, Transaction aTxn, |
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131 long aLeaseTime) |
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132 throws IOException, TransactionException { |
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133 |
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134 TxnState myJiniTxn = TxnManager.get().resolve(aTxn); |
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135 |
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136 long myLeaseTime = |
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137 Time.getAbsoluteTime(LeaseBounds.boundWrite(aLeaseTime)); |
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138 |
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139 EntryRepository myRepos = |
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140 EntryRepositoryFactory.get().get(anEntry.getType()); |
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141 |
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142 if (myRepos.noSchemaDefined()) { |
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143 DiskTxn myTxn = DiskTxn.newTxn(); |
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144 |
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145 myRepos.setFields(anEntry.getFields()); |
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146 |
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147 /* |
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148 Update parent repositories - each parent needs to know about |
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149 this subtype |
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150 */ |
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151 String[] myParents = anEntry.tearOffParents(); |
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152 |
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153 for (int i = 0; i < myParents.length; i++) { |
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154 EntryRepository myParentRepos = |
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155 EntryRepositoryFactory.get().get(myParents[i]); |
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156 myParentRepos.addSubtype(anEntry.getType()); |
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157 } |
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158 |
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159 myTxn.commit(); |
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160 } |
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161 |
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162 /* |
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163 Invoke write on the repository and then bundle up the OID into |
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164 an appropriate Lease form? |
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165 */ |
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166 OID myOID; |
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167 |
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168 WriteEscortImpl myEscort = new WriteEscortImpl(myJiniTxn); |
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169 |
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170 myRepos.write(anEntry, myLeaseTime, myEscort); |
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171 |
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172 OpInfo myResult = myEscort.getInfo(); |
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173 |
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174 myOID = myResult.getOID(); |
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175 |
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176 /* |
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177 Post an event for notifies and blockers |
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178 */ |
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179 QueueEvent myEvent = |
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180 new QueueEvent(QueueEvent.ENTRY_WRITE, |
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181 myJiniTxn, |
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182 new QueueEvent.Context(anEntry, myOID)); |
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183 |
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184 if (isSynchronousNotify) |
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185 EventQueue.get().add(myEvent, true); |
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186 else |
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187 EventQueue.get().add(myEvent); |
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188 |
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189 // For null transactions we must issue the commit |
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190 if (myJiniTxn.isNull()) |
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191 TxnManager.get().prepareAndCommit(myJiniTxn); |
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192 |
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193 SpaceUID mySUID = new SpaceEntryUID(anEntry.getType(), myOID); |
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194 return new WriteTicketImpl(mySUID, myLeaseTime); |
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195 } |
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196 |
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197 private MangledEntry find(MangledEntry anEntry, Transaction aTxn, |
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198 long aWaitTime, boolean doTake, boolean ifExists) |
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199 throws IOException, TransactionException { |
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200 |
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201 MangledEntry myEntry = null; |
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202 |
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203 TxnState myJiniTxn = TxnManager.get().resolve(aTxn); |
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204 |
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205 EntryRepository myRepos = |
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206 EntryRepositoryFactory.get().find(anEntry.getType()); |
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207 |
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208 SingleMatchTask myTask; |
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209 VisitorBaulkedPartyFactory myFactory; |
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210 |
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211 if (ifExists) |
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212 myFactory = new ExistsFactory(); |
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213 else |
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214 myFactory = new SearchFactory(); |
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215 |
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216 if ((myRepos == null) || |
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217 (myRepos.getConstraints().get(Fifo.class) == null)) { |
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218 |
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219 /* |
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220 If repos doesn't yet exist, we're running on a first come |
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221 first served basis - it only makes sense to perform enforce |
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222 fifo when we've accrued some live Entry's in storage where |
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223 we wish to select those ahead of incoming matches. |
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224 |
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225 In terms of priority for incoming matches, SearchTasks natural |
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226 order will ensure that the oldest blocking task gets the incoming |
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227 matches before anyone else |
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228 */ |
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229 myTask = new SearchVisitorImpl(anEntry, doTake, |
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230 myJiniTxn, myFactory); |
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231 } else { |
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232 myTask = new FifoSearchVisitorImpl(anEntry, doTake, |
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233 myJiniTxn, myFactory); |
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234 } |
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235 |
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236 if (myRepos != null) { |
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237 myRepos.find(anEntry, myTask.getVisitor()); |
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238 |
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239 if (myTask.wouldBlock()) { |
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240 |
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241 // Try subtypes |
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242 String[] mySubtypes = myRepos.getSubtypes(); |
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243 |
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244 for (int i = 0; i < mySubtypes.length; i++) { |
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245 myRepos = EntryRepositoryFactory.get().find(mySubtypes[i]); |
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246 |
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247 if (myRepos != null) { |
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248 myRepos.find(anEntry, myTask.getVisitor()); |
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249 |
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250 // If we got a match from the search (or it could |
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251 // have come from a recent write) |
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252 if (!myTask.wouldBlock()) |
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253 break; |
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254 } |
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255 } |
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256 } |
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257 } else { |
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258 // Don't bother as the only sensible thing to do is wait |
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259 // which will happen below |
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260 } |
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261 |
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262 try { |
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263 // Result waiting? |
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264 if (!myTask.wouldBlock()) |
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265 myEntry = myTask.getEntry(0); |
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266 else { |
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267 // Will optionally force early exit if there were no conflicts |
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268 myFactory.enableResolutionSignal(); |
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269 |
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270 myEntry = |
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271 myTask.getEntry(Time.getWaitTime(aWaitTime)); |
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272 } |
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273 } catch (InterruptedException anIE) { |
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274 throw new TransactionException("Search interrupted"); |
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275 } catch (TransactionException aTE) { |
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276 if (myJiniTxn.isNull()) |
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277 TxnManager.get().abort(myJiniTxn); |
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278 |
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279 throw aTE; |
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280 } |
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281 |
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282 // If we started the txn we MUST finish it, entry or not |
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283 if (myJiniTxn.isNull()) { |
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284 TxnManager.get().prepareAndCommit(myJiniTxn); |
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285 } |
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286 |
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287 return myEntry; |
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288 } |
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289 |
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290 public MangledEntry take(MangledEntry anEntry, Transaction aTxn, |
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291 long aWaitTime) |
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292 throws IOException, TransactionException { |
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293 |
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294 return find(anEntry, aTxn, aWaitTime, true, false); |
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295 } |
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296 |
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297 public MangledEntry read(MangledEntry anEntry, Transaction aTxn, |
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298 long aWaitTime) |
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299 throws IOException, TransactionException { |
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300 |
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301 return find(anEntry, aTxn, aWaitTime, false, false); |
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302 } |
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303 |
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304 public MangledEntry takeIfExists(MangledEntry anEntry, Transaction aTxn, |
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305 long aWaitTime) |
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306 throws IOException, TransactionException { |
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307 |
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308 return find(anEntry, aTxn, aWaitTime, true, true); |
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309 } |
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310 |
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311 public MangledEntry readIfExists(MangledEntry anEntry, Transaction aTxn, |
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312 long aWaitTime) |
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313 throws IOException, TransactionException { |
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314 |
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315 return find(anEntry, aTxn, aWaitTime, false, true); |
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316 } |
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317 |
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318 public RegTicket notify(MangledEntry aTemplate, Transaction aTxn, |
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319 RemoteEventListener aListener, long aLeaseTime, |
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320 MarshalledObject aHandback) |
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321 throws IOException, TransactionException { |
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322 |
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323 TxnState myState = null; |
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324 |
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325 if (aTxn != null) { |
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326 try { |
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327 myState = TxnManager.get().getTxnFor(aTxn, false); |
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328 } catch (UnknownTransactionException aUTE) { |
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329 throw new TransactionException(); |
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330 } |
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331 } |
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332 |
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333 long myLeaseTime = |
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334 Time.getAbsoluteTime(LeaseBounds.boundNotify(aLeaseTime)); |
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335 |
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336 RegTicketImpl myTicket = |
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337 new RegTicketImpl(myLeaseTime); |
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338 |
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339 EventQueue.get().register(aTemplate, myState, aListener, |
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340 myLeaseTime, aHandback, myTicket); |
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341 return myTicket; |
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342 } |
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343 |
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344 public RegTicket visibility(MangledEntry[] aTemplates, Transaction aTxn, |
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345 RemoteEventListener aListener, long aLeaseTime, |
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346 MarshalledObject aHandback, boolean visibleOnly) |
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347 throws IOException, TransactionException { |
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348 |
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349 TxnState myState = null; |
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350 |
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351 if (aTxn != null) { |
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352 try { |
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353 myState = TxnManager.get().getTxnFor(aTxn, false); |
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354 } catch (UnknownTransactionException aUTE) { |
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355 throw new TransactionException(); |
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356 } |
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357 } |
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358 |
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359 long myLeaseTime = |
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360 Time.getAbsoluteTime(LeaseBounds.boundNotify(aLeaseTime)); |
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361 |
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362 RegTicketImpl myTicket = |
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363 new RegTicketImpl(myLeaseTime); |
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364 |
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365 EventQueue.get().registerVisibility(aTemplates, myState, aListener, |
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366 myLeaseTime, aHandback, myTicket, |
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367 visibleOnly); |
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368 return myTicket; |
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369 } |
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370 |
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371 /** |
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372 * Call this method to obtain a collection of matches available within the |
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373 * currently active instance against the specified templates. |
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374 * |
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375 * @param holdLocks if <code>true</code> indicates that read locks should |
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376 * be held against the specified transaction rather than just tested |
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377 * @param shouldUpdate if <code>true</code> will cause this view to be |
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378 * dynamically updated with new writes after initial scan of contents |
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379 * @param aMax is the maximum number of Entry's to return |
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380 */ |
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381 public EntryView getView(MangledEntry[] aTemplates, Transaction aTxn, |
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382 boolean holdLocks, boolean shouldUpdate, long aMax) |
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383 throws IOException, TransactionException { |
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384 |
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385 return new EntryViewImpl(aTxn, aTemplates, holdLocks, |
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386 shouldUpdate, aMax); |
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387 } |
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388 |
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389 /** |
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390 * Call this method to obtain a collection of matches available within the |
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391 * currently active instance against the specified templates. The view |
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392 * returned will be dynamically updated. |
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393 * |
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394 * @param holdLocks if <code>true</code> indicates that read locks should |
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395 * be held against the specified transaction rather than just tested |
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396 * @param aMax is the maximum number of Entry's to return |
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397 * |
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398 */ |
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399 public EntryView getView(MangledEntry[] aTemplates, Transaction aTxn, |
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400 boolean holdLocks, long aMax) |
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401 throws IOException, TransactionException { |
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402 |
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403 return new EntryViewImpl(aTxn, aTemplates, holdLocks, true, aMax); |
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404 } |
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405 |
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406 public List write(List aMangledEntries, |
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407 Transaction aTxn, |
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408 List aLeaseTimes) |
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409 throws IOException, TransactionException { |
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410 |
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411 ArrayList myTickets = new ArrayList(); |
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412 |
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413 TxnState myJiniTxn = TxnManager.get().resolve(aTxn); |
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414 |
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415 WriteEscortImpl myEscort = new WriteEscortImpl(myJiniTxn); |
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416 |
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417 int myLast = aMangledEntries.size() - 1; |
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418 |
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419 for (int i = 0; i < aMangledEntries.size(); i++) { |
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420 MangledEntry myEntry = (MangledEntry) aMangledEntries.get(i); |
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421 long myLongLease = ((Long) aLeaseTimes.get(i)).longValue(); |
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422 |
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423 EntryRepository myRepos = |
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424 EntryRepositoryFactory.get().get(myEntry.getType()); |
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425 |
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426 if (myRepos.noSchemaDefined()) { |
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427 DiskTxn myTxn = DiskTxn.newTxn(); |
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428 |
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429 myRepos.setFields(myEntry.getFields()); |
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430 |
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431 /* |
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432 Update parent repositories - each parent needs to know about |
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433 this subtype |
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434 */ |
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435 String[] myParents = myEntry.tearOffParents(); |
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436 |
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437 for (int j = 0; j < myParents.length; j++) { |
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438 EntryRepository myParentRepos = |
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439 EntryRepositoryFactory.get().get(myParents[j]); |
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440 myParentRepos.addSubtype(myEntry.getType()); |
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441 } |
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442 |
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443 myTxn.commit(); |
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444 } |
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445 |
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446 /* |
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447 Invoke write on the repository and then bundle up the OID into |
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448 an appropriate Lease form? |
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449 */ |
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450 OID myOID; |
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451 |
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452 long myLeaseTime = |
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453 Time.getAbsoluteTime(LeaseBounds.boundWrite(myLongLease)); |
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454 |
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455 myRepos.write(myEntry, myLeaseTime, myEscort); |
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456 |
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457 OpInfo myResult = myEscort.getInfo(); |
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458 |
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459 myOID = myResult.getOID(); |
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460 |
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461 /* |
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462 Post an event for notifies and blockers |
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463 */ |
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464 QueueEvent myEvent = |
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465 new QueueEvent(QueueEvent.ENTRY_WRITE, |
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466 myJiniTxn, |
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467 new QueueEvent.Context(myEntry, myOID)); |
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468 |
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469 /* |
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470 Only need to post synchronously on the last write |
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471 */ |
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472 if ((isSynchronousNotify) && (i == myLast)) |
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473 EventQueue.get().add(myEvent, true); |
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474 else |
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475 EventQueue.get().add(myEvent); |
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476 |
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477 SpaceUID mySUID = new SpaceEntryUID(myEntry.getType(), myOID); |
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478 myTickets.add(new WriteTicketImpl(mySUID, myLeaseTime)); |
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479 } |
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480 |
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481 if (myJiniTxn.isNull()) { |
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482 TxnManager.get().prepareAndCommit(myJiniTxn); |
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483 } |
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484 |
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485 return myTickets; |
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486 } |
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487 |
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488 public List take(MangledEntry[] aTemplates, |
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489 Transaction aTxn, |
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490 long aWaitTime, |
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491 long aLimit) |
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492 throws TransactionException, IOException { |
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493 |
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494 TxnState myJiniTxn = TxnManager.get().resolve(aTxn); |
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495 |
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496 BulkMatchTask myVisitor = |
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497 new BulkTakeVisitor(aTemplates, myJiniTxn, aLimit, |
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498 new SearchFactory()); |
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499 |
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500 EntryRepository myRepos; |
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501 |
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502 // For each template |
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503 for (int i = 0; i < aTemplates.length; i++) { |
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504 myRepos = |
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505 EntryRepositoryFactory.get().find(aTemplates[i].getType()); |
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506 |
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507 // If we have a repository rooted at the type |
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508 if (myRepos != null) { |
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509 myRepos.find(aTemplates[i], myVisitor.getVisitor()); |
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510 |
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511 // Did we satisfy the visitor already? |
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512 if (myVisitor.wantsMore()) { |
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513 |
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514 // If not, try subtypes of the current type |
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515 String[] mySubtypes = myRepos.getSubtypes(); |
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516 |
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517 for (int j = 0; j < mySubtypes.length; j++) { |
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518 myRepos = |
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519 EntryRepositoryFactory.get().find(mySubtypes[j]); |
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520 |
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521 if (myRepos != null) { |
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522 myRepos.find(aTemplates[i], myVisitor.getVisitor()); |
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523 |
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524 if (!myVisitor.wantsMore()) |
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525 break; |
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526 } |
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527 } |
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528 } |
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529 } |
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530 |
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531 if (!myVisitor.wantsMore()) |
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532 break; |
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533 } |
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534 |
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535 try { |
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536 if (!myVisitor.wouldBlock()) |
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537 return myVisitor.getEntries(0); |
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538 else { |
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539 return myVisitor.getEntries(Time.getWaitTime(aWaitTime)); |
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parents:
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540 } |
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parents:
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541 } catch (InterruptedException anIE) { |
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542 throw new TransactionException("Search interrupted"); |
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543 } finally { |
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544 if (myJiniTxn.isNull()) |
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545 TxnManager.get().prepareAndCommit(myJiniTxn); |
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546 } |
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547 } |
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548 |
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549 public LeaseControl getLeaseControl() { |
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550 return theLeaseController; |
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551 } |
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|
552 |
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|
553 public TxnControl getTxnControl() { |
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554 return theTxnController; |
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|
555 } |
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parents:
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556 |
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parents:
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557 public void stop() throws Exception { |
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558 ActiveObjectRegistry.stopAll(); |
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559 |
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560 Disk.sync(); |
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561 |
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562 Disk.stop(); |
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563 |
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564 theLogger.log(Level.INFO, "Dumping stats"); |
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565 Stat[] myStats = StatsBoard.get().getStats(); |
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parents:
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changeset
|
566 for (int i = 0; i < myStats.length; i++) { |
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parents:
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567 theLogger.log(Level.INFO, myStats[i].getId() + ", " + myStats[i]); |
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parents:
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|
568 } |
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parents:
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|
569 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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570 theLogger.log(Level.INFO, "Blitz core halted after: " + |
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Dan Creswell <dan.creswell@gmail.com>
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571 (System.currentTimeMillis() - theStartTime) + |
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parents:
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572 " ms"); |
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parents:
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|
573 } |
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|
574 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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575 /** |
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576 Clear out all Entry's including schema information. |
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577 This is necessarily very destructive as it aborts operations and |
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578 open transactions and deletes a lot of underlying database state. |
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|
579 |
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Dan Creswell <dan.creswell@gmail.com>
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|
580 @todo Need to replace the use of SearchTasks.destroy() - should be |
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changeset
|
581 possible via the transaction abort all route - need to check |
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parents:
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|
582 */ |
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parents:
diff
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|
583 public void empty() throws IOException { |
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584 // Kill outstanding search tasks because we plan to drop schema |
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585 // and thus their templates are rendered invalid |
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|
586 // SearchTasks.get().destroy(); |
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|
587 |
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changeset
|
588 // Abort all transactions to release locks |
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parents:
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589 TxnManager.get().abortAll(); |
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Dan Creswell <dan.creswell@gmail.com>
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|
590 |
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parents:
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changeset
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591 EntryRepositoryFactory.get().deleteAllEntrys(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
592 |
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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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593 // Checkpoint |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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|
594 TxnManager.get().requestSyncCheckpoint(); |
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parents:
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changeset
|
595 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
596 EntryRepositoryFactory.get().deleteAllRepos(); |
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597 } |
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598 |
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599 /** |
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600 Triggers a manual reap in a new thread |
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601 */ |
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602 public void reap() { |
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603 Thread myReaper = |
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604 new Thread(new Runnable() { |
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605 public void run() { |
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606 EntryRepositoryFactory.reap(); |
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607 } |
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608 }); |
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609 |
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610 myReaper.start(); |
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611 } |
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612 } |