Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/WriteEntryOpInfo.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.*; |
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6 |
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7 import net.jini.entry.AbstractEntry; |
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8 import org.dancres.blitz.disk.DiskTxn; |
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9 |
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10 import org.dancres.blitz.mangler.MangledEntry; |
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11 import org.dancres.blitz.mangler.EntryMangler; |
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12 |
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13 import org.dancres.blitz.txn.TxnState; |
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14 |
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15 import org.dancres.blitz.oid.OID; |
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16 |
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17 import org.dancres.blitz.arc.CacheBlockDescriptor; |
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18 import org.dancres.blitz.arc.RecoverySummary; |
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19 |
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20 class WriteEntryOpInfo implements OpInfo { |
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21 static final long serialVersionUID = -6227846450032402193L; |
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22 |
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23 private OID theOID; |
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24 private MangledEntry theEntry; |
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25 private long theInitialExpiry; |
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26 |
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27 private transient boolean wasOnDisk; |
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28 |
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29 WriteEntryOpInfo(EntrySleeveImpl aSleeve) { |
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30 theOID = aSleeve.getOID(); |
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31 theInitialExpiry = aSleeve.getExpiry(); |
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32 theEntry = aSleeve.getEntry(); |
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33 } |
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34 |
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35 public boolean isDebugOp() { |
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36 // Write's are never false though they can be aborted |
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37 // |
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38 return false; |
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39 } |
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40 |
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41 public void restore() throws IOException { |
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42 EntryReposRecovery myRepos = |
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43 EntryRepositoryFactory.get().getAdmin(theEntry.getType()); |
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44 |
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45 if (myRepos == null) { |
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46 SleeveCache.theLogger.log(Level.SEVERE, "Yikes couldn't getAdmin"); |
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47 throw new IOException("Couldn't getAdmin"); |
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48 } |
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49 |
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50 if (myRepos.noSchemaDefined()) { |
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51 DiskTxn myTxn = DiskTxn.newTxn(); |
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52 |
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53 myRepos.setFields(theEntry.getFields()); |
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54 |
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55 /* |
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56 Update parent repositories - each parent needs to know about |
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57 this subtype |
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58 */ |
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59 String[] myParents = theEntry.tearOffParents(); |
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60 |
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61 for (int i = 0; i < myParents.length; i++) { |
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62 EntryRepository myParentRepos = |
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63 EntryRepositoryFactory.get().get(myParents[i]); |
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64 myParentRepos.addSubtype(theEntry.getType()); |
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65 } |
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66 |
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67 myTxn.commit(); |
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68 } |
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69 |
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70 EntrySleeveImpl mySleeve = |
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71 new EntrySleeveImpl(theOID, theEntry, theInitialExpiry); |
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72 |
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73 RecoverySummary mySummary = myRepos.recover(mySleeve); |
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74 |
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75 // If the entry was on disk, instance counts are already up-to-date |
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76 // so we don't want to count the entry twice |
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77 // |
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78 wasOnDisk = mySummary.wasOnDisk(); |
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79 |
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80 mySummary.getCBD().release(); |
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81 } |
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82 |
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83 public MangledEntry commit(TxnState aState) throws IOException { |
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84 MangledEntry myEntry = null; |
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85 |
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86 EntryReposRecovery myRepos = |
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87 EntryRepositoryFactory.get().getAdmin(theEntry.getType()); |
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88 |
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89 CacheBlockDescriptor myCBD = myRepos.load(theOID); |
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90 |
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91 if (myCBD != null) { |
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92 EntrySleeveImpl mySleeve = (EntrySleeveImpl) myCBD.getContent(); |
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93 |
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94 mySleeve.getState().clear(SleeveState.PINNED); |
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95 |
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96 /** |
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97 * If Entry is deleted, lease has expired or we've taken it in |
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98 * the same transaction as this write. In those cases, we don't |
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99 * want to generate any events so we return null. Note that |
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100 * ENTRY_WRITE is generated elsewhere and thus writes remain |
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101 * visible event wise within transaction scope (i.e. for notify's |
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102 * on the transaction). |
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103 */ |
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104 if (! mySleeve.getState().test(SleeveState.DELETED)) { |
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105 myEntry = theEntry; |
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106 // System.err.println("Wrote: " + theOID); |
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107 } |
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108 |
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109 /* |
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110 If it wasOnDisk we needn't mark it dirty otherwise we must to |
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111 ensure the data reaches disk. We needn't mark it dirty any |
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112 earlier because if we crash prior to this stage, the Entry |
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113 shouldn't be written anyways. |
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114 */ |
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115 if (!wasOnDisk) |
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116 mySleeve.markDirty(); |
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117 |
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118 myCBD.release(); |
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119 } |
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120 |
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121 // Update counters outside of lock |
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122 if (!wasOnDisk) |
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123 myRepos.getCounters().didWrite(); |
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124 |
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125 return myEntry; |
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126 } |
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127 |
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128 public MangledEntry abort(TxnState aState) throws IOException { |
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129 EntryReposRecovery myRepos = |
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130 EntryRepositoryFactory.get().getAdmin(theEntry.getType()); |
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131 |
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132 CacheBlockDescriptor myCBD = myRepos.load(theOID); |
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133 |
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134 if (myCBD != null) { |
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135 EntrySleeveImpl mySleeve = (EntrySleeveImpl) myCBD.getContent(); |
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136 |
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137 mySleeve.getState().set(SleeveState.DELETED); |
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138 mySleeve.getState().clear(SleeveState.PINNED); |
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139 |
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140 /* |
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141 Write has been aborted, we need to ensure we do appropriate |
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142 cleanup. |
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143 */ |
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144 mySleeve.markDirty(); |
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145 |
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146 myCBD.release(); |
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147 } |
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148 |
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149 return null; |
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150 } |
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151 |
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152 public OID getOID() { |
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153 return theOID; |
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154 } |
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155 |
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156 public String getType() { |
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157 return theEntry.getType(); |
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158 } |
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159 |
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160 public String toString() { |
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161 String myEntryRep = "Unusable"; |
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162 |
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163 try { |
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164 myEntryRep = |
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165 AbstractEntry.toString( |
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166 EntryMangler.getMangler().unMangle(theEntry)); |
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167 } catch (Exception anE) { |
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168 // Nothing to do |
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169 myEntryRep = myEntryRep + ": " + anE.getClass(); |
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170 } |
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171 |
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172 return "W : " + theEntry.getType() + " : " + theOID + " : " + |
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173 theInitialExpiry + " : " + theEntry.sizeOf() + " : " + |
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174 theEntry.getCodebase() + " [ " + myEntryRep + " ]"; |
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175 } |
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176 } |