Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/oid/FIFOAllocatorImpl.java @ 32:243c74d599bf
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author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:41:47 +0100 |
parents | 3dc0c5604566 |
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rev | line source |
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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 a single zone at a time. |
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29 The early OID's are smaller numerically than later OID's such that the |
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30 user of these OID's can apply an ordering which yields FIFO behaviour.</p> |
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31 */ |
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32 class FIFOAllocatorImpl implements AllocatorAdmin, Syncable { |
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33 static Logger theLogger = |
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34 Logging.newLogger("org.dancres.blitz.oid.Allocator"); |
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35 |
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36 private static final byte[] ALLOCATOR_KEY = |
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37 new byte[] {0x00, 0x00, 0x00, 0x01}; |
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38 |
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39 private static int MAX_ALLOCATOR = 512; |
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40 |
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41 private OIDAllocator theAllocator; |
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42 |
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43 private Registry theMetaData; |
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44 private String theName; |
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45 |
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46 FIFOAllocatorImpl(String aName) throws IOException { |
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47 theLogger.log(Level.INFO, "FIFOAllocator: " + aName); |
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48 |
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49 theMetaData = |
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50 RegistryFactory.get(getDbNameFor(aName), |
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51 new OIDInitializer()); |
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52 theName = aName; |
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53 |
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54 UnsyncdOps myBarrier = (UnsyncdOps) |
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55 BootContext.get(UnsyncdOps.class); |
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56 |
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57 if (myBarrier != null) { |
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58 theLogger.log(Level.INFO, theName + ":Resync'ing allocator: " + |
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59 myBarrier.getOpsSinceLastCheckpoint()); |
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60 } |
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61 |
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62 loadAllocator(); |
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63 |
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64 if (myBarrier != null) { |
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65 theAllocator.jump(myBarrier.getOpsSinceLastCheckpoint()); |
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66 |
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67 if (theAllocator.isExhausted()) { |
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68 if (theAllocator.getId() == (MAX_ALLOCATOR - 1)) |
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69 throw new Error("FIFOAllocator was exhausted - VERY BAD!"); |
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70 |
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71 theAllocator = new OIDAllocator(theAllocator.getId() + 1, |
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72 theAllocator.getId() + 1); |
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73 theAllocator.jump(myBarrier.getOpsSinceLastCheckpoint()); |
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74 } |
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75 |
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76 try { |
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77 sync(); |
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78 } catch (Exception anE) { |
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79 theLogger.log(Level.SEVERE, theName + |
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80 ":Failed to sync against barrier", |
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81 anE); |
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82 throw new IOException("Failed to sync against barrier"); |
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83 } |
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84 } |
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85 |
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86 Disk.add(this); |
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87 } |
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88 |
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89 private void loadAllocator() throws IOException { |
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90 DiskTxn myStandalone = DiskTxn.newStandalone(); |
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91 |
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92 MetaIterator myAllocatorStates = |
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93 theMetaData.getAccessor(myStandalone).readAll(); |
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94 |
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95 Serializable myEntry = |
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96 theMetaData.getAccessor(myStandalone).load(ALLOCATOR_KEY); |
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97 |
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98 OIDAllocator myAllocator = new OIDAllocator(); |
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99 myAllocator.setState(myEntry); |
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100 |
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101 theAllocator = myAllocator; |
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102 myStandalone.commit(); |
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103 } |
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104 |
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105 /** |
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106 Call this within an active DiskTxn |
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107 */ |
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108 public OID getNextId() throws IOException { |
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109 synchronized(this) { |
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110 |
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111 OID myID = null; |
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112 |
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113 if (theAllocator.isExhausted()) { |
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114 if (theAllocator.getId() == (MAX_ALLOCATOR - 1)) |
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115 throw new Error("FIFOAllocator was exhausted - VERY BAD!"); |
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116 |
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117 theAllocator = new OIDAllocator(theAllocator.getId() + 1, |
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118 theAllocator.getId() + 1); |
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119 } |
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120 |
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121 myID = theAllocator.newOID(); |
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122 |
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123 return myID; |
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124 } |
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125 } |
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126 |
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127 public int getMaxZoneId() { |
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128 /* |
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129 HACK: We put up an arbitary limit, if we ever exceed this |
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130 we'll break LeaseTrackerImpl in blitz.entry |
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131 */ |
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132 return MAX_ALLOCATOR; |
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133 } |
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134 |
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135 public void sync() throws Exception { |
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136 DiskTxn myTxn = DiskTxn.newStandalone(); |
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137 |
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138 RegistryAccessor myAccessor = theMetaData.getAccessor(myTxn); |
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139 |
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140 synchronized(this) { |
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141 myAccessor.save(ALLOCATOR_KEY, theAllocator.getState()); |
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142 } |
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143 |
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144 myTxn.commit(true); |
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145 } |
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146 |
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147 public void close() throws Exception { |
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148 theMetaData.close(); |
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149 } |
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150 |
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151 public void delete() throws IOException { |
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152 theMetaData.close(); |
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153 |
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154 RegistryFactory.delete(getDbNameFor(theName)); |
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155 |
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156 Disk.remove(this); |
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157 } |
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158 |
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159 private String getDbNameFor(String aName) { |
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160 return aName + "_oid"; |
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161 } |
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162 |
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163 private class OIDInitializer implements Initializer { |
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164 OIDInitializer() { |
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165 } |
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166 |
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167 public void execute(RegistryAccessor anAccessor) throws IOException { |
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168 OIDAllocator myAlloc = new OIDAllocator(0); |
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169 anAccessor.save(ALLOCATOR_KEY, myAlloc.getState()); |
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170 } |
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171 } |
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172 } |