Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/disk/Disk.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.disk; |
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2 |
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3 import java.io.File; |
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4 import java.io.InputStream; |
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5 import java.io.IOException; |
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6 import java.io.RandomAccessFile; |
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7 |
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8 import java.nio.channels.FileChannel; |
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9 import java.nio.channels.FileLock; |
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10 |
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11 import java.util.List; |
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12 import java.util.ArrayList; |
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13 import java.util.Iterator; |
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14 import java.util.Properties; |
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15 |
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16 import java.util.logging.*; |
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17 |
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18 import net.jini.config.ConfigurationException; |
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19 |
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20 import com.sleepycat.je.Environment; |
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21 import com.sleepycat.je.EnvironmentConfig; |
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22 import com.sleepycat.je.DatabaseConfig; |
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23 import com.sleepycat.je.TransactionConfig; |
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24 import com.sleepycat.je.Transaction; |
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25 import com.sleepycat.je.Database; |
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26 import com.sleepycat.je.DatabaseException; |
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27 import com.sleepycat.je.LockStats; |
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28 import com.sleepycat.je.EnvironmentStats; |
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29 import com.sleepycat.je.StatsConfig; |
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30 |
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31 import org.dancres.blitz.Logging; |
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32 |
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33 import org.dancres.blitz.config.ConfigurationFactory; |
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34 import org.dancres.util.NumUtil; |
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35 |
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36 /** |
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37 This class is responsible for managing the underlying BerkeleyDB |
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38 infrastructure. Anyone using this class to create/manipulate databases |
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39 should likely be registered as a Syncable instance so that it is aware |
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40 of requests for synchronization and closure of databases. |
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41 */ |
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42 public class Disk { |
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43 private static Environment theEnv; |
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44 // private static TransactionConfig theTxnConfig; |
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45 |
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46 private static String theLocation; |
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47 private static long theDbCacheSize; |
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48 private static int theMaxTxns; |
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49 private static int maxDbLog; |
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50 private static int maxLogIteratorBuffer; |
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51 private static int maxLogBuffers; |
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52 private static int maxLogBufferBytes; |
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53 private static int maxNodeEntries; |
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54 |
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55 private static RandomAccessFile theLockFile; |
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56 private static FileChannel theLockChannel; |
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57 private static FileLock theLock; |
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58 |
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59 private static List theDbs; |
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60 |
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61 private static boolean isTransient; |
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62 |
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63 static Logger theLogger = |
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64 Logging.newLogger("org.dancres.blitz.disk.Disk"); |
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65 |
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66 private static List theSyncTasks = new ArrayList(); |
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67 |
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68 static { |
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69 try { |
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70 theLocation = |
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71 (String) ConfigurationFactory.getEntry("persistDir", |
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72 String.class); |
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73 |
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74 try { |
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75 String myNewCacheForm = |
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76 ((String) ConfigurationFactory.getEntry("dbCache", |
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77 String.class, |
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78 new Long(1024 * 1024).toString())); |
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79 |
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80 try { |
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81 theDbCacheSize = NumUtil.convertToBytes(myNewCacheForm); |
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82 } catch (IllegalArgumentException anIE) { |
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83 theLogger.log(Level.SEVERE, "Failed to parse cache size", |
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84 anIE); |
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85 throw new Error("Cannot start - failed to parse cace size"); |
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86 } |
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87 |
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88 } catch (ConfigurationException aCE) { |
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89 // Ignore it for now and try the old format |
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90 // |
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91 theDbCacheSize = |
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92 ((Long) ConfigurationFactory.getEntry("dbCache", |
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93 long.class, |
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94 new Long(1024 * 1024))).longValue(); |
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95 } |
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96 |
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97 theMaxTxns = |
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98 ((Integer) ConfigurationFactory.getEntry("maxDbTxns", |
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99 int.class, |
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100 new Integer(256))).intValue(); |
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101 |
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102 maxDbLog = |
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103 ((Integer) ConfigurationFactory.getEntry("maxDbLog", |
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104 int.class, |
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105 new Integer(10000000))).intValue(); |
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106 |
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107 maxLogIteratorBuffer = |
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108 ((Integer) ConfigurationFactory.getEntry("maxLogIteratorBuff", |
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109 int.class, |
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110 new Integer(1024))).intValue(); |
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111 |
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112 maxLogBuffers = |
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113 ((Integer) ConfigurationFactory.getEntry("maxLogBuffers", |
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114 int.class, |
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115 new Integer(5))).intValue(); |
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116 |
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117 maxLogBufferBytes = |
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118 ((Integer) ConfigurationFactory.getEntry("maxLogBufferBytes", |
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119 int.class, |
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120 new Integer(4620000))).intValue(); |
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121 |
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122 maxNodeEntries = |
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123 ((Integer) ConfigurationFactory.getEntry("maxNodeEntries", |
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124 int.class, |
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125 new Integer(128))).intValue(); |
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126 |
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127 theLogger.log(Level.INFO, "Max txns: " + theMaxTxns); |
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128 theLogger.log(Level.INFO, "DbCache: " + theDbCacheSize); |
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129 } catch (Exception anE) { |
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130 theLogger.log(Level.SEVERE, "Couldn't get Disk config", |
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131 anE); |
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132 throw new Error("Disk didn't start", anE); |
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133 } |
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134 } |
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135 |
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136 public static void setTransient(boolean transientDisk) { |
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137 isTransient = transientDisk; |
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138 } |
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139 |
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140 public static void init() { |
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141 try { |
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142 new File(theLocation).mkdirs(); |
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143 |
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144 lockLocation(); |
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145 |
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146 Properties myDbProps = new Properties(); |
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147 |
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148 InputStream myPropsStream = |
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149 Disk.class.getResourceAsStream("db.properties"); |
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150 |
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151 if (myPropsStream == null) |
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152 throw new IOException("Failed to load default db settings"); |
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153 |
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154 myDbProps.load(myPropsStream); |
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155 |
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156 if (isTransient) { |
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157 theLogger.log(Level.INFO, |
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158 "Forced checkpointer on for transient ops"); |
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159 myDbProps.setProperty("je.env.runCheckpointer", "true"); |
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160 } |
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161 |
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162 myDbProps.setProperty("je.log.fileMax", |
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163 Integer.toString(maxDbLog)); |
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164 |
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165 /* |
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166 Run a benchmark with these disabled, then run them again |
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167 enabled. |
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168 myDbProps.setProperty("je.log.iteratorReadSize", |
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169 Integer.toString(maxLogIteratorBuffer)); |
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170 |
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171 myDbProps.setProperty("je.log.numBuffers", |
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172 Integer.toString(maxLogBuffers)); |
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173 |
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174 myDbProps.setProperty("je.log.totalBufferBytes", |
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175 Integer.toString(maxLogBufferBytes)); |
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176 |
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177 myDbProps.setProperty("je.nodeMaxEntries", |
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178 Integer.toString(maxNodeEntries)); |
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179 |
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180 */ |
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181 |
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182 EnvironmentConfig myConfig = new EnvironmentConfig(myDbProps); |
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183 myConfig.setCacheSize(theDbCacheSize); |
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184 myConfig.setTransactional(true); |
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185 myConfig.setAllowCreate(true); |
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186 |
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187 // theTxnConfig = new TransactionConfig(); |
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188 // theTxnConfig.setNoSync(true); |
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189 |
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190 theLogger.log(Level.INFO, "Opening Database"); |
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191 |
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192 theEnv = new Environment(new File(theLocation), myConfig); |
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193 |
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194 theLogger.log(Level.INFO, "Database recovery complete"); |
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195 |
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196 theDbs = theEnv.getDatabaseNames(); |
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197 |
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198 } catch (UnsatisfiedLinkError aULE) { |
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199 theLogger.log(Level.SEVERE, "Warning, didn't load library for db cleanly - are you using Inca X?", aULE); |
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200 theLogger.log(Level.SEVERE, "Try restarting the container..."); |
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201 theLogger.log(Level.SEVERE, "Ignoring library load failure - if Blitz doesn't boot, check your library path"); |
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202 ClassLoader myLoader = Disk.class.getClassLoader(); |
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203 throw new Error("Disk didn't start: " + myLoader, aULE); |
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204 } catch (Exception anE) { |
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205 theLogger.log(Level.SEVERE, "Couldn't start Disk", |
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206 anE); |
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207 throw new Error("Disk didn't start", anE); |
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208 } catch (Error anErr) { |
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209 theLogger.log(Level.SEVERE, "Got error", anErr); |
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210 theLogger.log(Level.SEVERE, anErr.getMessage()); |
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211 |
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212 ClassLoader myLoader = Disk.class.getClassLoader(); |
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213 throw new Error("Disk didn't start: " + myLoader, anErr); |
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214 } |
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215 } |
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216 |
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217 /** |
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218 Eradicate state associated with Disk |
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219 */ |
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220 public static synchronized void destroy() { |
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221 deleteFiles(getDbLocation()); |
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222 } |
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223 |
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224 /** |
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225 Eradicate state held in some specific directory |
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226 */ |
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227 public static synchronized void clean(String aDir) { |
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228 deleteFiles(aDir); |
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229 } |
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230 |
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231 private static String getDbLocation() { |
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232 return theLocation; |
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233 } |
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234 |
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235 public static void add(Syncable aSyncable) { |
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236 synchronized(theSyncTasks) { |
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237 theSyncTasks.add(aSyncable); |
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238 } |
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239 } |
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240 |
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241 public static void remove(Syncable aSyncable) { |
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242 synchronized(theSyncTasks) { |
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243 theSyncTasks.remove(aSyncable); |
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244 } |
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245 } |
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246 |
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247 private static Syncable[] getSyncTasks() { |
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248 synchronized(theSyncTasks) { |
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249 Syncable[] myTasks = new Syncable[theSyncTasks.size()]; |
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250 return (Syncable[]) theSyncTasks.toArray(myTasks); |
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251 } |
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252 } |
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253 |
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254 public static void stop() throws Exception { |
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255 if (theEnv != null) { |
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256 theLogger.info("BDB closing"); |
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257 try { |
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258 WriteDaemon.get().halt(); |
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259 |
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260 close(); |
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261 |
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262 theEnv.sync(); |
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263 theEnv.close(); |
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264 theLogger.info("BDB closed"); |
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265 } catch (DatabaseException aDBE) { |
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266 theLogger.log(Level.SEVERE, "Couldn't close BDB", aDBE); |
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267 throw new Exception("Couldn't close BDB"); |
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268 } |
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269 } |
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270 } |
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271 |
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272 /** |
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273 If the backup directory doesn't exist, it will be created. |
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274 If the backup directory does exist, the caller should ensure that |
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275 it has been cleared before the backup is performed. This permits |
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276 the caller to determine what to do with old backups beforehand. |
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277 */ |
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278 public static void backup(String aDestDir) |
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279 throws IOException { |
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280 |
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281 File myDest = new File(aDestDir); |
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282 |
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283 myDest.mkdir(); |
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284 |
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285 File[] myFiles = myDest.listFiles(); |
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286 |
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287 if (myFiles.length > 0) |
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288 throw new IOException("Backup dir should be empty"); |
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289 |
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290 BackupTask myTask = new BackupTask(new File(getDbLocation()), myDest); |
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291 |
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292 try { |
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293 /* |
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294 We cannot use sync because we need WriteDaemon to perform |
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295 the backup post sync'ing the queue. This is required to |
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296 prevent WriteDaemon from performing further updates whilst |
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297 we perform the backup and prevents issues with state leakage. |
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298 */ |
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299 Syncable[] mySyncables = getSyncTasks(); |
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300 |
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301 for (int i = 0; i < mySyncables.length; i++) { |
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302 mySyncables[i].sync(); |
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303 } |
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304 |
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305 WriteDaemon.get().queue(myTask); |
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306 WriteDaemon.get().push(); |
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307 |
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308 } catch (Exception anE) { |
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309 IOException myIOE = new IOException("Couldn't start sync"); |
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310 myIOE.initCause(anE); |
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311 throw myIOE; |
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312 } |
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313 |
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314 myTask.waitForCompletion(); |
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315 } |
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316 |
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317 private static void deleteFiles(String aDir) { |
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318 theLogger.log(Level.INFO, "Deleting: " + aDir); |
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319 |
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320 File myDir = new File(aDir); |
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321 |
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322 File[] myFiles = myDir.listFiles(); |
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323 |
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324 if (myFiles == null) |
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325 return; |
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326 |
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327 for (int i = 0; i < myFiles.length; i++) { |
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328 File myFile = myFiles[i]; |
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329 |
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330 if (myFile.isFile()) { |
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331 theLogger.log(Level.INFO, "Deleting: " + myFile); |
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332 myFile.delete(); |
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333 } else { |
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334 theLogger.log(Level.INFO, "Leaving: " + myFile); |
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335 } |
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336 } |
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337 } |
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338 |
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339 private static void lockLocation() throws IOException { |
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340 theLockFile = new RandomAccessFile(new File(theLocation, |
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341 "blitz.lock"), "rw"); |
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342 |
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343 theLockChannel = theLockFile.getChannel(); |
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344 |
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345 theLock = theLockChannel.tryLock(); |
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346 |
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347 if (theLock == null) |
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348 throw new IOException("Couldn't lock, are you running another Blitz instance in this directory?"); |
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349 } |
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350 |
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351 private static void close() throws Exception { |
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352 Syncable[] mySyncables = getSyncTasks(); |
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353 |
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354 for (int i = 0; i < mySyncables.length; i++) { |
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355 mySyncables[i].close(); |
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356 } |
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357 |
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358 if (theLock != null) |
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359 theLock.release(); |
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360 |
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361 if (theLockChannel != null) |
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362 theLockChannel.close(); |
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363 |
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364 if (theLockFile != null) |
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365 theLockFile.close(); |
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366 } |
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367 |
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368 /** |
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369 <p>Blocks the caller whilst a sync-to-disk is performed. |
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370 Sync-to-disk requires:</p> |
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371 |
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372 <ol> |
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373 <li>Flush dirty state from caches into WriteDaemon queue</li> |
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374 <li>Flush queue</li> |
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375 <li>Wait for queue flush</li> |
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376 <li>Checkpoint Db</li> |
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377 </ol> |
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378 |
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379 */ |
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380 public static void sync() throws Exception { |
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381 sync(null); |
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382 } |
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383 |
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384 /** |
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385 @param aCompletionTask if null, the caller is blocked until |
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386 state has successfully been flushed to disk. Note that the point |
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387 at which the caller will be awoken is guarenteed to be after state |
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388 was sync'd but may not be immediately afterwards. If non-null, |
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389 the caller will not be blocked because the code that is dependent |
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390 on completion of the flush is assumed to be in the passed completion |
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391 task. As per the null case, this completion task will be executed |
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392 at some point after WriteDaemon flushed the queue but not necessarily |
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393 immediately. |
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394 |
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395 @see org.dancres.blitz.disk.WriteDaemon |
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396 */ |
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397 public static void sync(Runnable aCompletionTask) |
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398 throws Exception { |
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399 |
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400 Syncable[] mySyncables = getSyncTasks(); |
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401 |
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402 for (int i = 0; i < mySyncables.length; i++) { |
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403 mySyncables[i].sync(); |
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404 } |
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405 |
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406 SyncFinalizer myCompleter = new SyncFinalizer(theEnv, aCompletionTask); |
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407 WriteDaemon.get().push(myCompleter); |
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408 |
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409 /* |
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410 SyncFinalizer will figure out whether to block the caller. |
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411 If aCompletionTask is non-null, waitForCompletion will not block |
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412 otherwise it will. |
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413 */ |
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414 myCompleter.waitForCompletion(); |
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415 } |
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416 |
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417 public static Database newDb(Transaction aTxn, String aDbName, |
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418 DatabaseConfig aConfig) |
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419 throws DatabaseException { |
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420 |
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421 aConfig.setTransactional(true); |
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422 |
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423 synchronized(theDbs) { |
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424 theDbs.add(aDbName); |
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425 } |
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426 |
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427 try { |
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428 return theEnv.openDatabase(aTxn, aDbName, aConfig); |
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429 } catch (DatabaseException aDBE) { |
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430 synchronized(theDbs) { |
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431 theDbs.remove(aDbName); |
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432 throw aDBE; |
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433 } |
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434 } |
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435 } |
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436 |
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437 /** |
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438 Delete's the underlying Db database. WARNING: This can be blocked |
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439 by checkpoints or failed by replication if insufficient time has passed. |
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440 */ |
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441 public static void deleteDb(String aName) throws IOException { |
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442 try { |
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443 synchronized(theDbs) { |
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444 theDbs.remove(aName); |
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445 } |
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446 |
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447 theEnv.removeDatabase(null, aName); |
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448 } catch (DatabaseException aDbe) { |
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449 theLogger.log(Level.SEVERE, "Couldn't delete Db", aDbe); |
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450 throw new IOException("Failed to delete db"); |
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451 } |
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452 } |
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453 |
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454 public static boolean dbExists(String aName) { |
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455 synchronized(theDbs) { |
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456 return theDbs.contains(aName); |
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457 } |
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458 } |
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459 |
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460 static Transaction newTxn() throws DatabaseException { |
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461 TransactionConfig myConfig = new TransactionConfig(); |
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462 myConfig.setNoSync(true); |
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463 |
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464 return theEnv.beginTransaction(null, myConfig); |
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465 } |
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466 |
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467 static Transaction newNonBlockingTxn() throws DatabaseException { |
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468 TransactionConfig myConfig = new TransactionConfig(); |
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469 myConfig.setNoSync(true); |
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470 myConfig.setNoWait(true); |
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471 |
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472 return theEnv.beginTransaction(null, myConfig); |
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473 } |
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474 |
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475 public static void dumpLocks() { |
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476 try { |
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477 StatsConfig myConfig = new StatsConfig(); |
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478 myConfig.setFast(false); |
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479 |
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480 LockStats myStats = theEnv.getLockStats(myConfig); |
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481 |
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482 System.err.println("Locks"); |
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483 System.err.println("Owners:" + myStats.getNOwners()); |
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484 System.err.println("RdLock:" + myStats.getNReadLocks()); |
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485 System.err.println("WrLock:" + myStats.getNWriteLocks()); |
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486 System.err.println("Total locks:" + myStats.getNTotalLocks()); |
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487 System.err.println("Waiters:" + myStats.getNWaiters()); |
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488 |
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489 } catch (DatabaseException anE) { |
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490 System.err.println("Whoops couldn't dump stats"); |
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491 } |
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492 } |
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493 |
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494 public static void dumpStats() { |
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495 try { |
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496 StatsConfig myConfig = new StatsConfig(); |
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497 myConfig.setFast(false); |
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498 |
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499 EnvironmentStats myStats = theEnv.getStats(myConfig); |
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500 |
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501 System.err.println(myStats); |
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502 |
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503 /* |
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504 System.err.println("Log Buffer bytes: " + |
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505 myStats.getBufferBytes()); |
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506 |
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507 System.err.println("Cache misses: " + myStats.getNCacheMiss()); |
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508 |
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509 System.err.println("Cache data bytes" + |
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510 myStats.getCacheDataBytes()); |
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511 |
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512 System.err.println("Cache total bytes" + |
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513 myStats.getCacheTotalBytes()); |
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514 */ |
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515 } catch (Exception anE) { |
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516 WriteDaemon.theLogger.log(Level.INFO, |
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517 "Couldn't dump stats", anE); |
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518 } |
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519 } |
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520 |
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521 public static void main(String args[]) { |
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522 try { |
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523 System.out.println("Disk storing at: " + Disk.getDbLocation()); |
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524 Disk.stop(); |
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525 } catch (Exception anE) { |
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526 System.err.println("Got errors during test - see log"); |
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527 } |
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528 } |
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529 } |