Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/LeaseTrackerImpl.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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0
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1 package org.dancres.blitz.entry; |
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2 |
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3 import java.io.IOException; |
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4 |
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5 import java.util.logging.Level; |
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6 |
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7 import com.sleepycat.je.Database; |
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8 import com.sleepycat.je.Cursor; |
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9 import com.sleepycat.je.DatabaseEntry; |
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10 import com.sleepycat.je.DatabaseException; |
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11 import com.sleepycat.je.DatabaseConfig; |
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12 import com.sleepycat.je.OperationStatus; |
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13 import com.sleepycat.je.LockMode; |
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14 |
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15 import org.dancres.blitz.disk.Disk; |
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16 import org.dancres.blitz.disk.DiskTxn; |
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17 |
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18 import org.dancres.blitz.lease.ReapFilter; |
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19 |
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20 /** |
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21 Database layout: |
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22 |
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23 <ul> |
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24 <li>Sleeve expiries are divided into buckets according to the allocator |
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25 id of their EntryUID.</li> |
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26 <li>Each bucket contains entries consisting of the expiry(long) followed by |
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27 oid(long) making a total of 16 bytes.</li> |
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28 <li>Each bucket's entries are sorted in ascending order by expiry.</li> |
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29 <ul> |
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30 |
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31 <p> Typical page size is 4096 bytes / 16 = 256 entries per page. |
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32 Thus, if we configure sufficient allocators (good for concurrency anyway) |
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33 we can ensure we get efficient grouping of entries against pages which |
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34 allows.for good cache behaviour.</p> |
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35 */ |
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36 class LeaseTrackerImpl implements LeaseTracker { |
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37 private Database theLeasesDb; |
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38 private String theType; |
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39 |
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40 private int theMaxAllocId; |
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41 |
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42 LeaseTrackerImpl(String aType, int aMaxAllocId) throws IOException { |
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43 EntryStorage.theLogger.log(Level.FINE, "Tracker created: " + aType); |
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44 |
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45 theType = aType; |
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46 theMaxAllocId = aMaxAllocId; |
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47 |
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48 try { |
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49 DatabaseConfig myConfig = new DatabaseConfig(); |
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50 myConfig.setAllowCreate(true); |
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51 myConfig.setSortedDuplicates(true); |
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52 |
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53 theLeasesDb = Disk.newDb(null, theType + "_leases", myConfig); |
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54 |
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55 } catch (DatabaseException aDbe) { |
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56 EntryStorage.theLogger.log(Level.SEVERE, |
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57 "Tracker failed to init db", |
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58 aDbe); |
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59 throw new IOException(); |
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60 } |
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61 } |
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62 |
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63 public void bringOutTheDead(EntryReaper aReaper) throws IOException { |
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64 /* |
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65 Read blocks from disk recovering all necessary entries which |
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66 are expired at this point in time. Then we can release the |
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67 txn and schedule up some deletes in cache via the ReapFilter. |
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68 Repeat for each bucket - we don't even need to expire all dead items |
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69 in a block... |
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70 */ |
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71 |
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72 EntryStorage.theLogger.log(Level.INFO, |
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73 "LeaseTracker bringing out the dead for: " + |
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74 theType); |
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75 |
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76 // System.err.println("LeaseTracker bringing out the dead for: " + |
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77 // theType); |
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78 DiskTxn myTxn = null; |
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79 |
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80 myTxn = DiskTxn.newStandalone(); |
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81 |
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82 try { |
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83 Cursor myCursor = theLeasesDb.openCursor(null, null); |
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84 |
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85 aReaper.clean(new ExpiredLocatorImpl(myCursor)); |
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86 |
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87 myCursor.close(); |
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88 } catch (Throwable aT) { |
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89 EntryStorage.theLogger.log(Level.SEVERE, |
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90 "Exception during reap", |
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91 aT); |
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92 throw new IOException("Fatal error in reap"); |
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93 } finally { |
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94 myTxn.commit(); |
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95 } |
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96 |
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97 EntryStorage.theLogger.log(Level.INFO, |
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98 "LeaseTracker claimed the dead for: " + |
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99 theType); |
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100 // System.err.println("LeaseTracker claimed the dead for: " + |
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101 // theType); |
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102 } |
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103 |
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104 public void delete(PersistentEntry anEntry) throws IOException { |
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105 byte[] myOid = LeaseRecordUtils.getId(anEntry); |
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106 DiskTxn myTxn = DiskTxn.newStandalone(); |
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107 |
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108 // System.err.println("Delete a lease"); |
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109 |
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110 try { |
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111 DatabaseEntry myKey = |
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112 new DatabaseEntry(LeaseRecordUtils.getBucketKey(anEntry)); |
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113 DatabaseEntry myValue = new DatabaseEntry(); |
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114 |
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115 Cursor myCursor = theLeasesDb.openCursor(myTxn.getDbTxn(), null); |
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116 OperationStatus myStatus = |
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117 myCursor.getSearchKey(myKey, myValue, LockMode.RMW); |
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118 |
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119 while ((! myStatus.equals(OperationStatus.NOTFOUND)) && |
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120 (! LeaseRecordUtils.isKey(myValue.getData(), myOid))) { |
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121 // System.err.println("Skipping for del"); |
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122 |
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123 myValue = new DatabaseEntry(); |
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124 myStatus = myCursor.getNextDup(myKey, myValue, LockMode.RMW); |
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125 } |
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126 |
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127 if (! myStatus.equals(OperationStatus.NOTFOUND)) { |
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128 // System.err.println("Lease killed"); |
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129 myCursor.delete(); |
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130 } |
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131 |
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132 myCursor.close(); |
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133 } catch (DatabaseException aDbe) { |
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134 EntryStorage.theLogger.log(Level.SEVERE, "Failed to delete entry", |
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135 aDbe); |
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136 throw new IOException(); |
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137 } finally { |
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138 myTxn.commit(); |
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139 } |
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140 } |
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141 |
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142 public void update(PersistentEntry anEntry) throws IOException { |
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143 // System.err.println("Update a lease"); |
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144 delete(anEntry); |
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145 write(anEntry); |
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146 } |
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147 |
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148 public void write(PersistentEntry anEntry) throws IOException { |
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149 // System.err.println("Write a lease"); |
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150 byte[] myBucketKey = LeaseRecordUtils.getBucketKey(anEntry); |
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151 byte[] myLeaseEntry = LeaseRecordUtils.getLeaseEntry(anEntry); |
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152 |
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153 DiskTxn myTxn = DiskTxn.newStandalone(); |
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154 |
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155 try { |
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156 theLeasesDb.put(myTxn.getDbTxn(), new DatabaseEntry(myBucketKey), |
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157 new DatabaseEntry(myLeaseEntry)); |
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158 } catch (DatabaseException aDbe) { |
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159 EntryStorage.theLogger.log(Level.SEVERE, |
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160 "Failed to insert new entry", |
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161 aDbe); |
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162 throw new IOException(); |
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163 } finally { |
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164 myTxn.commit(); |
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165 } |
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166 } |
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167 |
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168 public void close() throws IOException { |
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169 try { |
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170 theLeasesDb.close(); |
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171 } catch (DatabaseException aDbe) { |
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172 EntryStorage.theLogger.log(Level.SEVERE, |
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173 "Failed to close lease db", |
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174 aDbe); |
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175 throw new IOException(); |
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176 } |
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177 } |
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178 |
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179 public void delete() throws IOException { |
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180 Disk.deleteDb(theType + "_leases"); |
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181 } |
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182 } |