Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/oid/AllocatorImpl.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.oid; |
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2 |
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3 import java.io.Serializable; |
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4 import java.io.IOException; |
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5 |
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6 import java.util.Random; |
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7 import java.util.ArrayList; |
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8 |
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9 import java.util.logging.*; |
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10 |
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11 import org.dancres.blitz.disk.DiskTxn; |
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12 import org.dancres.blitz.disk.Disk; |
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13 import org.dancres.blitz.disk.Syncable; |
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14 |
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15 import org.dancres.blitz.meta.Registry; |
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16 import org.dancres.blitz.meta.RegistryAccessor; |
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17 import org.dancres.blitz.meta.RegistryFactory; |
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18 import org.dancres.blitz.meta.MetaIterator; |
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19 import org.dancres.blitz.meta.MetaEntry; |
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20 import org.dancres.blitz.meta.Initializer; |
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21 |
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22 import org.dancres.blitz.Logging; |
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23 import org.dancres.blitz.BootContext; |
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24 |
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25 import org.dancres.blitz.txn.UnsyncdOps; |
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26 |
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27 /** |
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28 <p>Provides an OID allocation service using upto n zones where n is |
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29 the maximum number of zones as specified at construction time.</p> |
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30 |
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31 <p>AllocatorImpl's are checkpointed regularly as part of other checkpointing |
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32 operations. Thus, they can only be out of date by the maximum number of |
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33 operations possible between checkpoints so, on reload, a corrective jump |
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34 is applied determined by that maximum</p> |
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35 */ |
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36 class AllocatorImpl implements AllocatorAdmin, Syncable { |
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37 static Logger theLogger = |
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38 Logging.newLogger("org.dancres.blitz.oid.Allocator"); |
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39 |
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40 private OIDAllocator[] theAllocators; |
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41 private Random theAllocatorChooser = new Random(); |
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42 private int theMaxZones; |
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43 |
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44 private Registry theMetaData; |
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45 private String theName; |
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46 |
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47 AllocatorImpl(String aName, int anAllocSpaceSize) throws IOException { |
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48 theLogger.log(Level.INFO, "Allocator: " + aName); |
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49 |
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50 theMetaData = |
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51 RegistryFactory.get(getDbNameFor(aName), |
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52 new OIDInitializer(anAllocSpaceSize)); |
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53 theName = aName; |
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54 theMaxZones = anAllocSpaceSize; |
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55 theAllocators = new OIDAllocator[theMaxZones]; |
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56 |
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57 UnsyncdOps myBarrier = (UnsyncdOps) |
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58 BootContext.get(UnsyncdOps.class); |
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59 |
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60 if (myBarrier != null) { |
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61 theLogger.log(Level.INFO, theName + ":Resync'ing allocators: " + |
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62 myBarrier.getOpsSinceLastCheckpoint()); |
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63 } |
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64 |
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65 ArrayList myAllocators = loadAllocators(); |
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66 |
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67 /* |
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68 Make sure OIDAllocators go back into the correct slots within |
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69 the array. It's possible that they will have been read out of order |
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70 from the underlying storage |
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71 */ |
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72 long myMin = Long.MAX_VALUE; |
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73 |
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74 for (int i = 0; i < theMaxZones; i++) { |
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75 OIDAllocator myAllocator = (OIDAllocator) myAllocators.get(i); |
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76 theAllocators[myAllocator.getId()] = myAllocator; |
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77 |
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78 /* |
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79 Do we need to resync the oid allocator? |
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80 */ |
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81 if (myBarrier != null) { |
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82 long myNext = |
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83 myAllocator.jump(myBarrier.getOpsSinceLastCheckpoint()); |
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84 |
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85 if (myNext < myMin) |
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86 myMin = myNext; |
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87 } |
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88 } |
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89 |
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90 if (myBarrier != null) { |
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91 try { |
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92 theLogger.log(Level.INFO, "Minimum allocator oid for " + |
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93 theName + ": " + myMin); |
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94 sync(); |
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95 } catch (Exception anE) { |
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96 theLogger.log(Level.SEVERE, theName + |
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97 ":Failed to sync against barrier", |
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98 anE); |
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99 throw new IOException("Failed to sync against barrier"); |
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100 } |
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101 } |
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102 |
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103 Disk.add(this); |
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104 } |
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105 |
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106 private ArrayList loadAllocators() throws IOException { |
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107 ArrayList myAllocators = new ArrayList(); |
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108 |
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109 DiskTxn myStandalone = DiskTxn.newStandalone(); |
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110 |
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111 MetaIterator myAllocatorStates = |
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112 theMetaData.getAccessor(myStandalone).readAll(); |
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113 |
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114 MetaEntry myEntry; |
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115 |
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116 while ((myEntry = myAllocatorStates.fetch()) != null) { |
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117 OIDAllocator myAllocator = new OIDAllocator(); |
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118 myAllocator.setState(myEntry.getData()); |
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119 myAllocators.add(myAllocator); |
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120 } |
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121 |
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122 myAllocatorStates.release(); |
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123 myStandalone.commit(); |
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124 |
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125 return myAllocators; |
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126 } |
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127 |
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128 /** |
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129 Call this within an active DiskTxn |
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130 */ |
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131 public OID getNextId() throws IOException { |
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132 OIDAllocator myAllocator = |
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133 theAllocators[theAllocatorChooser.nextInt(theMaxZones)]; |
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134 |
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135 OID myID = null; |
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136 |
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137 synchronized(myAllocator) { |
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138 myID = myAllocator.newOID(); |
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139 } |
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140 |
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141 return myID; |
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142 } |
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143 |
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144 public int getMaxZoneId() { |
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145 return theMaxZones; |
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146 } |
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147 |
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148 public void sync() throws Exception { |
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149 DiskTxn myTxn = DiskTxn.newStandalone(); |
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150 |
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151 RegistryAccessor myAccessor = theMetaData.getAccessor(myTxn); |
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152 |
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153 for (int i = 0; i < theAllocators.length; i++) { |
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154 OIDAllocator myAlloc = theAllocators[i]; |
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155 |
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156 synchronized(myAlloc) { |
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157 myAccessor.save(myAlloc.getKey(), myAlloc.getState()); |
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158 } |
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159 } |
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160 |
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161 myTxn.commit(true); |
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162 } |
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163 |
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164 public void close() throws Exception { |
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165 theMetaData.close(); |
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166 } |
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167 |
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168 public void delete() throws IOException { |
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169 theMetaData.close(); |
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170 |
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171 RegistryFactory.delete(getDbNameFor(theName)); |
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172 |
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173 Disk.remove(this); |
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174 } |
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175 |
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176 private String getDbNameFor(String aName) { |
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177 return aName + "_oid"; |
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178 } |
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179 |
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180 private class OIDInitializer implements Initializer { |
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181 private int theNumAllocators; |
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182 |
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183 OIDInitializer(int aNumAllocators) { |
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184 theNumAllocators = aNumAllocators; |
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185 } |
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186 |
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187 public void execute(RegistryAccessor anAccessor) throws IOException { |
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188 for (int i = 0; i < theNumAllocators; i++) { |
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189 OIDAllocator myAlloc = new OIDAllocator(i, theNumAllocators); |
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190 anAccessor.save(myAlloc.getKey(), myAlloc.getState()); |
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191 } |
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192 } |
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193 } |
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194 } |