Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/txn/TxnManager.java @ 8:fa7203ea1622
Remove some dead code (Dave Brosius)
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 23 May 2009 11:27:41 +0100 |
parents | 3dc0c5604566 |
children | 4580bb12db30 |
rev | line source |
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0
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1 package org.dancres.blitz.txn; |
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2 |
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3 import java.io.IOException; |
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4 import java.io.Serializable; |
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5 import java.rmi.RemoteException; |
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6 import java.util.logging.Level; |
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7 import java.util.logging.Logger; |
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8 |
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9 import net.jini.config.ConfigurationException; |
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10 import net.jini.core.transaction.Transaction; |
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11 import net.jini.core.transaction.TransactionException; |
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12 import net.jini.core.transaction.UnknownTransactionException; |
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13 import net.jini.core.transaction.server.ServerTransaction; |
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14 import net.jini.core.transaction.server.TransactionConstants; |
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15 import net.jini.core.transaction.server.TransactionManager; |
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16 |
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17 import org.dancres.blitz.Logging; |
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18 import org.dancres.blitz.config.ConfigurationFactory; |
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19 import org.dancres.blitz.disk.Disk; |
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20 import org.dancres.blitz.stats.StatsBoard; |
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21 import org.dancres.blitz.task.Tasks; |
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22 import EDU.oswego.cs.dl.util.concurrent.ReadWriteLock; |
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23 import EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock; |
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24 import org.prevayler.Command; |
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25 import org.prevayler.SnapshotContributor; |
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26 import org.prevayler.implementation.SnapshotPrevayler; |
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27 import org.prevayler.implementation.Snapshotter; |
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28 |
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29 /** |
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30 Responsible for tracking/managing transactions. This responsiblity is split |
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31 across two classes. TxnManager handles control aspects whilst |
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32 TxnManagerState tracks the transactional information. <P> |
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33 |
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34 We make our lives a little easier by making null transactions look like a |
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35 normal transaction which keeps things consistent and clean bar an implied |
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36 prepare/commit cycle in the operation code of SpaceImpl. It also assists |
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37 us in that the transaction code can be largely tested without an external |
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38 transaction manager because a lot of it is exercised during the use of null |
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39 operations. <P> |
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40 |
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41 The transaction subsystems logging and snapshot/checkpointing requirements |
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42 are handled by holding all state in TxnManagerState and making it a |
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43 <code>PrevalentSystem</code>. Snapshots are treated as the equivalent of |
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44 checkpoints and are triggered in a separate thread. <P> |
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45 |
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46 Note that snapshots cannot be performed alongside the processing of commands |
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47 thus, we take a write on a readerswriter lock during snapshot and release it |
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48 after. All other operations are performed under a readlock. Note that the |
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49 write lock must be asserted BEFORE invoking snapshot to avoid deadlock. |
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50 The snapshot is only written to disk after Disk.sync completes.<P> |
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51 |
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52 The actual workings are a little different from the norm with TxnManager |
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53 generating commands which act upon TxnManagerState. Certain methods don't |
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54 generate commands at all because they don't represent a true state change. |
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55 Typically these methods are related to introducing new initial state into |
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56 TxnManagerState such as a transaction which doesn't need to be made |
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57 durable (saved to log etc.) until it reaches the prepared state. <P> |
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58 |
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59 Prepare records a durable record of the transaction's operations whilst |
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60 commit and abort result in those operations being applied. <P> |
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61 |
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62 @see org.prevayler.PrevalentSystem |
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63 @see org.prevayler.Command |
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64 @see org.dancres.blitz.txn.TxnManagerState |
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65 |
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66 @todo Micro-optimization - we don't need to write an abort record if |
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67 the txn isn't prepared - just clear it out! |
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68 */ |
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69 public class TxnManager { |
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70 |
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71 static Logger theLogger = |
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72 Logging.newLogger("org.dancres.blitz.TxnManager", Level.INFO); |
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73 |
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74 private static boolean LOG_CKPTS; |
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75 |
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76 static { |
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77 try { |
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78 LOG_CKPTS = |
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79 ((Boolean) |
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80 ConfigurationFactory.getEntry("logCkpts", |
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81 Boolean.class, |
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82 new Boolean(false))).booleanValue(); |
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83 } catch (ConfigurationException aCE) { |
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84 theLogger.log(Level.SEVERE, "Couldn't load config", aCE); |
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85 } |
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86 } |
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87 |
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88 private static TxnManager theManager; |
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89 |
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90 private TxnManagerState theManagerState; |
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91 |
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92 private ReadWriteLock theLock = new WriterPreferenceReadWriteLock(); |
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93 |
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94 private SnapshotPrevayler thePrevayler; |
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95 |
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96 private CheckpointTrigger theCheckpointTrigger; |
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97 |
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98 private long theCheckpointCount = 0; |
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99 |
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100 private TxnGateway theGateway; |
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101 |
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102 private boolean isRecovery = true; |
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103 |
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104 public static synchronized void init(TxnGateway aGateway) |
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105 throws Exception { |
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106 |
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107 if (theManager != null) { |
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108 return; |
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109 } else { |
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110 theManager = new TxnManager(aGateway); |
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111 theManager.recover(); |
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112 } |
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113 } |
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114 |
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115 public static synchronized TxnManager get() { |
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116 return theManager; |
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117 } |
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118 |
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119 private TxnManager(TxnGateway aGateway) { |
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120 theGateway = aGateway; |
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121 } |
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122 |
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123 private void recover() throws Exception { |
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124 StoragePersonality myPersonality = |
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125 StoragePersonalityFactory.getPersonality(); |
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126 |
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127 theLogger.log(Level.INFO, "Doing log recovery..."); |
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128 |
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129 thePrevayler = myPersonality.getPrevayler(new TxnManagerState()); |
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130 |
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131 theLogger.log(Level.INFO, "Log Recovery complete..."); |
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132 |
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133 theManagerState = (TxnManagerState) thePrevayler.system(); |
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134 |
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135 theCheckpointTrigger = |
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136 myPersonality.getCheckpointTrigger(new CheckpointerImpl(this)); |
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137 |
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138 StatsBoard.get().add(new TxnStatGenerator()); |
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139 |
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140 issueCheckpoint(true); |
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141 |
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142 isRecovery = false; |
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143 |
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144 // Startup the transaction pinger |
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145 new TxnPinger(theManagerState); |
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146 } |
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147 |
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148 /** |
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149 @return <code>true</code> if the TransactionManager is performing |
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150 recovery. When we are performing recovery the log files cannot be |
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151 written to by user code (that is code outside of the transaction |
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152 package). |
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153 */ |
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154 public boolean isRecovery() { |
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155 return isRecovery; |
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156 } |
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157 |
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158 public void add(SnapshotContributor aContributor) { |
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159 theManagerState.add(aContributor); |
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160 } |
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161 |
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162 public void remove(SnapshotContributor aContributor) { |
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163 theManagerState.remove(aContributor); |
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164 } |
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165 |
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166 public TxnGateway getGateway() { |
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167 return theGateway; |
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168 } |
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169 |
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170 /** |
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171 @return the number of transactions currently being processed. Includes |
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172 ACTIVE, PREPARED, COMMITTED and ABORTED (where the last two states may be |
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173 present depending on state with respect to log records etc). |
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174 */ |
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175 int getActiveTxnCount() { |
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176 try { |
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177 int myActiveTxnCount; |
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178 |
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179 theLock.readLock().acquire(); |
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180 |
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181 myActiveTxnCount = theManagerState.getNumActiveTxns(); |
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182 |
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183 theLock.readLock().release(); |
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184 |
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185 return myActiveTxnCount; |
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186 |
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187 } catch (InterruptedException anIE) { |
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188 theLogger.log(Level.SEVERE, "Couldn't get active txn count", |
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189 anIE); |
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190 |
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191 return -1; |
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192 } |
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193 } |
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194 |
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195 public TxnState getTxnFor(TxnId anId) |
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196 throws UnknownTransactionException, RemoteException { |
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197 return theManagerState.getTxnFor(anId, theGateway, true); |
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198 } |
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199 |
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200 /** |
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201 Resolve a JINI transaction using this method before calling any of |
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202 <code>prepare</code>, <code>commit</code>, <code>abort</code> or |
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203 <code>prepareAndCommit</code>. |
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204 */ |
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205 public TxnState getTxnFor(Transaction aTransaction, boolean mustExist) |
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206 throws UnknownTransactionException, RemoteException { |
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207 |
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208 TxnId myId = convertToId(aTransaction); |
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209 return theManagerState.getTxnFor(myId, theGateway, mustExist); |
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210 } |
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211 |
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212 /** |
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213 Invoked as part of the path for incoming transaction control via |
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214 the remote TransactionManager |
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215 */ |
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216 public TxnState getTxnFor(TransactionManager aMgr, long anId) |
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217 throws UnknownTransactionException, RemoteException { |
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218 |
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219 TxnId myId = convertToId(aMgr, anId); |
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220 return theManagerState.getTxnFor(myId, theGateway, true); |
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221 } |
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222 |
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223 /** |
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224 This method is slightly more flexible then getTxnFor in that it will |
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225 accept a <code>null</code> and return a new null transaction as well |
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226 as the usual mapping of JINI txn to internal txn state. |
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227 */ |
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228 public TxnState resolve(Transaction aTransaction) |
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229 throws UnknownTransactionException, RemoteException { |
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230 |
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231 if (aTransaction == null) |
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232 return newNullTxn(); |
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233 else |
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234 return getTxnFor(aTransaction, false); |
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235 } |
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236 |
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237 /** |
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238 In cases where no explicit transaction has been passed in by a caller, |
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239 create a null transaction which is an internal, fully transactional |
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240 replacement which can be used for the duration of the operation |
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241 in question. |
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242 */ |
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243 public TxnState newNullTxn() throws RemoteException { |
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244 return theManagerState.newNullTxn(); |
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245 } |
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246 |
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247 /** |
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248 In cases where no state will be changed (no Entry's taken or written), |
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249 create an instance of this transaction which, when commited or aborted |
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250 will be undone but not logged. |
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251 */ |
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252 public TxnState newIdentityTxn() throws RemoteException { |
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253 return theManagerState.newIdentityTxn(); |
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254 } |
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255 |
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256 /** |
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257 Doesn't throw a DbException because it just writes to disk. Restore |
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258 is coped with inside TxnManagerState when we're doing recovery and |
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259 an Exception could be thrown then. |
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260 */ |
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261 public int prepare(TxnState aState) throws UnknownTransactionException { |
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262 |
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263 try { |
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264 theLock.readLock().acquire(); |
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265 |
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266 aState.vote(); |
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267 |
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268 boolean dontLog = ((aState.isIdentity()) || (aState.hasNoOps())); |
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269 |
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270 Integer myResult = (Integer) |
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271 execute(new PrepCommand(aState), dontLog); |
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272 |
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273 theLock.readLock().release(); |
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274 |
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275 theCheckpointTrigger.loggedCommand(); |
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276 |
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277 return myResult.intValue(); |
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278 |
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279 } catch (InterruptedException anIE) { |
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280 theLogger.log(Level.SEVERE, "Failed to log prepare", anIE); |
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281 throw new UnknownTransactionException(); |
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282 } catch (Exception anE) { |
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283 theLock.readLock().release(); |
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284 theLogger.log(Level.SEVERE, "Failed to log prepare", anE); |
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285 throw new UnknownTransactionException(); |
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286 } |
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287 } |
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288 |
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289 public void commit(TxnState aState) throws UnknownTransactionException { |
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290 |
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291 try { |
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292 theLock.readLock().acquire(); |
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293 |
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294 boolean dontLog = ((aState.isIdentity()) || (aState.hasNoOps())); |
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295 |
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296 execute(new CommitCommand(aState.getId()), dontLog); |
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297 |
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298 theLock.readLock().release(); |
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299 |
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300 aState.doFinalize(); |
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301 |
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302 theCheckpointTrigger.loggedCommand(); |
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303 |
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304 } catch (InterruptedException anIE) { |
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305 theLogger.log(Level.SEVERE, "Failed to log commit", anIE); |
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306 throw new UnknownTransactionException(); |
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307 } catch (Exception anE) { |
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308 theLock.readLock().release(); |
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309 theLogger.log(Level.SEVERE, "Failed to log commit", anE); |
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310 throw new UnknownTransactionException(); |
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311 } |
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312 } |
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313 |
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314 public void abort(TxnState aState) throws UnknownTransactionException { |
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315 |
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316 try { |
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317 theLock.readLock().acquire(); |
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318 |
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319 int myResultingState = aState.vote(); |
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320 |
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321 /* |
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322 We're in at least voting state and possibly prepared state. |
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323 If at this point the txn is an identity transaction or |
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324 it has no operations we needn't log it. We also needn't log |
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325 it in the case where we've not yet written a prepare record |
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326 to disk which would be indicated by vote() returning |
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327 VOTING as opposed to PREPARED. |
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328 */ |
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329 boolean dontLog = |
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330 ((aState.isIdentity()) || (aState.hasNoOps()) || |
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331 (myResultingState == TransactionConstants.VOTING)); |
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332 |
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333 execute(new AbortCommand(aState.getId()), dontLog); |
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334 |
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335 theLock.readLock().release(); |
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336 |
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337 aState.doFinalize(); |
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338 |
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339 theCheckpointTrigger.loggedCommand(); |
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340 |
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341 } catch (InterruptedException anIE) { |
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342 theLogger.log(Level.SEVERE, "Failed to log abort", anIE); |
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343 throw new UnknownTransactionException(); |
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344 } catch (Exception anE) { |
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345 theLock.readLock().release(); |
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346 theLogger.log(Level.SEVERE, "Failed to log abort", anE); |
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347 throw new UnknownTransactionException(); |
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348 } |
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349 } |
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350 |
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351 public int prepareAndCommit(TxnState aState) |
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352 throws UnknownTransactionException { |
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353 |
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354 try { |
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355 theLock.readLock().acquire(); |
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356 |
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357 aState.vote(); |
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358 |
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359 boolean dontLog = ((aState.isIdentity()) || (aState.hasNoOps())); |
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360 |
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361 Integer myResult = (Integer) |
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362 execute(new PrepCommitCommand(aState), dontLog); |
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363 |
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364 theLock.readLock().release(); |
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365 |
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366 aState.doFinalize(); |
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367 |
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368 theCheckpointTrigger.loggedCommand(); |
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369 |
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370 return myResult.intValue(); |
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371 |
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372 } catch (InterruptedException anIE) { |
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373 theLogger.log(Level.SEVERE, "Failed to log prepCommit", anIE); |
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374 throw new UnknownTransactionException(); |
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375 } catch (Exception anE) { |
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376 theLock.readLock().release(); |
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377 theLogger.log(Level.SEVERE, "Failed to log prepCommit", anE); |
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378 throw new UnknownTransactionException(); |
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379 } |
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380 } |
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381 |
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382 /** |
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383 Log a specific single action in a transaction of its own. This is |
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384 typically used by elements of Blitz that need to record some state |
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385 transition that would need to be re-applied at recovery. |
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386 */ |
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387 public void log(TxnOp anOp) throws TransactionException { |
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388 tryLog(anOp, Long.MAX_VALUE); |
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389 } |
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390 |
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391 /** |
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392 Attempt to log an action. The attempt is bounded by the specified |
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393 timeout such that if the action cannot be logged within the time, it |
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394 will be abandoned. |
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395 |
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396 @return <code>true</code> if the action was written, <code>false</code> |
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397 otherwise. |
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398 */ |
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399 public boolean tryLog(TxnOp anOp, long aTimeout) |
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400 throws TransactionException { |
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401 |
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402 try { |
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403 TxnState myEnclosing = newNullTxn(); |
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404 |
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405 myEnclosing.add(anOp); |
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406 |
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407 if (theLock.readLock().attempt(aTimeout)) { |
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408 myEnclosing.vote(); |
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409 |
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410 // Given the contract of timeout, we can make this loss'y' |
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411 thePrevayler.executeCommand(new PrepCommitCommand(myEnclosing), |
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412 false); |
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413 theLock.readLock().release(); |
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414 theCheckpointTrigger.loggedCommand(); |
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415 return true; |
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416 } else |
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417 return false; |
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418 } catch (InterruptedException anIE) { |
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419 theLogger.log(Level.SEVERE, "Failed to log Action", anIE); |
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420 throw new TransactionException(); |
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421 } catch (Exception anE) { |
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422 theLock.readLock().release(); |
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423 theLogger.log(Level.SEVERE, "Failed to log Action", anE); |
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424 throw new TransactionException(); |
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425 } |
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426 } |
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427 |
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428 public void abortAll() throws IOException { |
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429 |
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430 try { |
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431 theLock.readLock().acquire(); |
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432 |
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433 // Has to be logged |
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434 // |
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435 thePrevayler.executeCommand(new AbortAllCommand()); |
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436 |
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437 theLock.readLock().release(); |
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438 |
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439 theCheckpointTrigger.loggedCommand(); |
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440 |
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441 } catch (InterruptedException anIE) { |
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442 theLogger.log(Level.SEVERE, "Failed to log abortAll", anIE); |
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443 throw new IOException(); |
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444 } catch (Exception anE) { |
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445 theLock.readLock().release(); |
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446 theLogger.log(Level.SEVERE, "Failed to log abortAll", anE); |
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447 throw new IOException(); |
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448 } |
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449 } |
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450 |
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451 private TxnId convertToId(TransactionManager aMgr, long anId) |
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452 throws RemoteException { |
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453 |
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454 return new TxnId(aMgr, anId); |
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455 } |
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456 |
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457 private TxnId convertToId(Transaction aTxn) throws RemoteException { |
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458 ServerTransaction myTxn = (ServerTransaction) aTxn; |
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459 |
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460 return new TxnId(myTxn.mgr, myTxn.id); |
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461 } |
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462 |
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463 /** |
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464 * @todo There's a race condition here where state might change after we |
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465 * check for in-memory execute or not leading to incorrect behaviour in |
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466 * face of a crash. This needs fixing whilst at the same time we should |
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467 * address the issue of an abort on an ACTIVE transaction which therefore |
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468 * needn't be logged. What we need to do is modify each command to report |
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469 * if it needs to be logged. We then modify the prevayler to execute |
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470 * the command and then determine if the outcome needs logging and log |
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471 * if necessary. Only the SnapshotPrevaylerImpl really cares about this |
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472 * so only it needs tweaking. This state should probably be deduced |
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473 * by the TxnState itself or TxnManagerState - it certainly needs to be |
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474 * done under the lock of the TxnState. The decision points for whether |
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475 * a transaction is idempotent are at initial prepare (where we discover |
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476 * if there are no listeners or the txn is the identity txn) and at an |
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477 * abort when the transaction it still active (and thus we haven't written |
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478 * a log record). |
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479 */ |
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480 private Serializable execute(Command aCommand, boolean dontLog) |
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481 throws Exception { |
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482 if (dontLog) { |
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483 // System.err.println("Bypass"); |
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484 return aCommand.execute(theManagerState); |
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485 } else { |
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486 // System.err.println("Full log"); |
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487 return thePrevayler.executeCommand(aCommand); |
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488 } |
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489 } |
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490 |
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491 /** |
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492 Run a hot backup. Basic contract is that we will catch all but the |
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493 currently active transactions (whose effects will be confined to the |
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494 cache anyway. |
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parents:
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495 |
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496 @param aDestDir the mount point/directory to copy the files to. |
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497 */ |
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498 public void hotBackup(String aDestDir) throws IOException { |
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499 |
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500 /* |
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501 First do an unlocked sync to get most updates from the cache |
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502 to disk. |
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parents:
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503 |
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504 Then take the txn lock and perform the second sync part of |
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505 which then does the file copy for backup purposes |
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506 */ |
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507 try { |
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508 Disk.sync(); |
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509 } catch (Exception anE) { |
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510 IOException anIOE = new IOException("Failed to start backup (initial sync)"); |
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511 anIOE.initCause(anE); |
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512 |
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513 throw anIOE; |
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514 } |
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515 |
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516 try { |
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517 theLock.writeLock().acquire(); |
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518 |
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519 try { |
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520 Disk.backup(aDestDir); |
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521 } finally { |
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522 theLock.writeLock().release(); |
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523 } |
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524 |
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parents:
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525 } catch (InterruptedException anIE) { |
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526 IOException anIOE = new IOException("Failed to start backup"); |
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527 anIOE.initCause(anIE); |
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528 |
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529 throw anIOE; |
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530 } |
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|
531 } |
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532 |
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parents:
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533 /** |
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parents:
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534 Used by external entities to request a snapshot which could be used |
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535 by another Blitz instance - i.e. think of this as a copy type operation. |
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536 |
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parents:
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537 @todo The checking of active transactions is not bullet proof because |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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538 we could get a new transaction before we start the checkpoint. Consider |
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parents:
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539 a barrier or some other fix (requires a decision on how to handle |
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parents:
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540 waiting for settling of transactions etc). We're keeping it simple for |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
541 now. |
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parents:
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|
542 */ |
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parents:
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543 public void requestSnapshot() throws TransactionException, IOException { |
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544 try { |
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545 int myActiveTxnCount; |
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parents:
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546 |
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parents:
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547 theLock.readLock().acquire(); |
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|
548 |
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549 myActiveTxnCount = theManagerState.getNumActiveTxns(); |
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|
550 |
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551 theLock.readLock().release(); |
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|
552 |
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553 if (myActiveTxnCount != 0) |
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parents:
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554 throw new TransactionException( |
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parents:
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555 "Cannot snapshot with active transactions it's bad for your data"); |
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parents:
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556 } catch (InterruptedException anIE) { |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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557 throw new TransactionException("Couldn't check for outstanding transactions"); |
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parents:
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558 } |
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parents:
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|
559 |
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parents:
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|
560 CheckpointTask myTask = new CheckpointTask(); |
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parents:
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561 |
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parents:
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|
562 try { |
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parents:
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563 Tasks.queue("checkpoints", myTask); |
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parents:
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564 } catch (InterruptedException anIE) { |
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parents:
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565 theLogger.log(Level.SEVERE, "Failed to queue checkpoint task", |
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parents:
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changeset
|
566 anIE); |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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|
567 throw new IOException("Failed to queue checkpoint task"); |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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|
568 } |
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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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|
569 |
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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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570 myTask.waitForCompletion(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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571 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
572 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
573 /** |
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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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|
574 Requests a checkpoint and blocks 'til completion. This method is |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
575 used internally by the Blitz core and unlike requestSnapshot makes |
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parents:
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576 no efforts to render the filesystem into a state which could be copied |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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577 to another Blitz instance. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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578 */ |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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579 public void requestSyncCheckpoint() throws IOException { |
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580 issueCheckpoint(true); |
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parents:
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|
581 } |
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parents:
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|
582 |
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parents:
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|
583 /** |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
584 This method is used internally by the Blitz core and unlike |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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585 requestSnapshot makes no efforts to render the filesystem into a state |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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586 which could be copied to another Blitz instance. |
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parents:
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changeset
|
587 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
588 <ol> |
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parents:
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589 <li> Assert a write lock to prevent further commands from being |
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parents:
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changeset
|
590 logged. </li> |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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591 <li> Snapshot the state of the PrevalentSystem (TxnManagerState) </li> |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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592 <li> Snapshot results in changeover to a new log file. |
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parents:
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changeset
|
593 <li> Release the write lock to allow further commands to enter the new |
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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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|
594 log file </li> |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
595 <li> Invoke Disk.sync to flush dirty data to disk which will callback |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
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changeset
|
596 on completion </li> |
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parents:
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597 <li> Callback triggers writing of the snapshot which invalidates all |
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598 log files previous to the one started above </li> |
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599 </ol> |
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600 |
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601 <p>In the event of failure before sync'ing is complete - i.e. the |
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602 snapshot has not been saved, log files from the previous snapshot |
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603 onwards will be used to re-construct state. If there's no previous |
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604 snapshot, all log files will be replayed to reconstruct state. </p> |
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605 |
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606 @see org.dancres.blitz.disk.Disk |
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607 */ |
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608 void requestAsyncCheckpoint() throws IOException { |
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609 issueCheckpoint(false); |
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610 } |
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611 |
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612 /** |
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613 Internal implementation of the checkpoint operation used by snapshot |
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614 and checkpoint methods above. |
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615 |
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616 @param isBlocking specifies whether to block the caller until the |
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617 checkpoint completes |
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618 */ |
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619 private void issueCheckpoint(boolean isBlocking) throws IOException { |
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620 |
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621 // Only checkpoint if the trigger says it's okay |
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622 if (theCheckpointTrigger.checkpointsDisabled()) |
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623 return; |
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624 |
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625 try { |
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626 long myCkptId; |
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627 |
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628 synchronized(this) { |
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629 myCkptId = theCheckpointCount++; |
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630 } |
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631 |
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632 if (LOG_CKPTS) |
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633 theLogger.log(Level.INFO, "Checkpoint::start: " + myCkptId); |
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634 |
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635 theLock.writeLock().acquire(); |
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636 |
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637 // Issue tentative checkpoint - change over logs |
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638 // and carry over prepared state from old log in snapshotter |
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639 // which will be commited/aborted in the new log |
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640 Snapshotter mySnapper = thePrevayler.takeSnapshot(); |
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641 |
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642 theLock.writeLock().release(); |
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643 |
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644 // Now sync disks and save snapshot at completion |
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645 if (isBlocking) { |
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646 BlockingSnapshotTask myTask = |
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647 new BlockingSnapshotTask(myCkptId, mySnapper); |
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648 |
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649 Disk.sync(myTask); |
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650 myTask.waitForCompletion(); |
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651 } else { |
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652 Disk.sync(new SnapshotTask(myCkptId, mySnapper)); |
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653 } |
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654 |
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655 if (LOG_CKPTS) |
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656 theLogger.log(Level.INFO, "Checkpoint::end: " + myCkptId); |
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657 |
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658 } catch (InterruptedException anIE) { |
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659 theLogger.log(Level.SEVERE, "Failed to get lock for ckpt", anIE); |
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660 throw new IOException("Failed to lock for ckpt"); |
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661 } catch (Exception anE) { |
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662 theLogger.log(Level.SEVERE, "Failed to sync", anE); |
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663 throw new IOException("Failed to sync"); |
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664 } |
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665 } |
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666 |
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667 /** |
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668 An instance of this object is passed to Disk.sync. It's run method |
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669 will be called once Disk has completed the sync task. When called, |
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670 it saves the snapshot to disk which obsoletes logs previous to the |
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671 snapshot (where previous is defined as a log with a sequence number |
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672 less than that of the snapshot). |
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673 */ |
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674 class SnapshotTask implements Runnable { |
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675 private Snapshotter theSnapper; |
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676 private long theCkptId; |
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677 |
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678 SnapshotTask(long aCkptId, Snapshotter aSnapper) { |
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679 theCkptId = aCkptId; |
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680 theSnapper = aSnapper; |
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681 } |
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682 |
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683 public void run() { |
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684 try { |
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685 if (LOG_CKPTS) |
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686 theLogger.log(Level.INFO, |
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687 "Disks sync'd - save snapshot: " + |
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688 theCkptId); |
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689 theSnapper.save(); |
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690 |
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691 if (LOG_CKPTS) |
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692 theLogger.log(Level.INFO, "Snapshot saved: " + theCkptId); |
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693 } catch (IOException anIOE) { |
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694 theLogger.log(Level.SEVERE, "Failed to save snapshot on sync", |
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695 anIOE); |
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696 } |
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697 } |
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698 } |
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699 |
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700 class BlockingSnapshotTask implements Runnable { |
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701 private Snapshotter theSnapper; |
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702 private long theCkptId; |
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703 private boolean isComplete; |
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704 |
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705 BlockingSnapshotTask(long aCkptId, Snapshotter aSnapper) { |
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706 theCkptId = aCkptId; |
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707 theSnapper = aSnapper; |
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708 } |
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709 |
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710 public void run() { |
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711 try { |
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712 if (LOG_CKPTS) |
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713 theLogger.log(Level.INFO, |
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714 "Disks sync'd - save snapshot: " + |
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715 theCkptId); |
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716 theSnapper.save(); |
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parents:
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717 |
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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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718 synchronized(this) { |
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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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719 isComplete = true; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
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720 notify(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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721 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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722 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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723 if (LOG_CKPTS) |
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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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724 theLogger.log(Level.INFO, "Snapshot saved: " + theCkptId); |
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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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725 } catch (IOException anIOE) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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726 theLogger.log(Level.SEVERE, "Failed to save snapshot on sync", |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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727 anIOE); |
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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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changeset
|
728 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
729 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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730 |
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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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731 void waitForCompletion() { |
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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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732 synchronized(this) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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733 while(! isComplete) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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734 try { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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735 wait(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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736 } catch (InterruptedException anIE) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
737 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
738 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
739 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
740 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
741 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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742 } |