Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/oid/AllocatorImpl.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +0100
parents 3dc0c5604566
children
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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 }