Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/entry/FindEntryOpInfo.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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children
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0
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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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 org.dancres.blitz.mangler.MangledEntry;
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6
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7 import org.dancres.blitz.txn.TxnState;
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8
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9 import org.dancres.blitz.oid.OID;
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10
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11 import org.dancres.blitz.arc.CacheBlockDescriptor;
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12
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13 class FindEntryOpInfo implements OpInfo {
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14 static final long serialVersionUID = -7864125234426980910L;
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15
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16 private boolean isTake;
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17 private OID theOID;
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18 private String theType;
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19
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20 FindEntryOpInfo(String aType, OID aOID, boolean doTake) {
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21 isTake = doTake;
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22 theType = aType;
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23 theOID = aOID;
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24 }
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25
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26 public boolean isDebugOp() {
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27 // Find's are always non-null so never false though they can be aborted
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28 //
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29 return false;
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30 }
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31
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32 public void restore() throws IOException {
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33 // Nothing to do - a previous write op info will restore the entry
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34 // or it's already deleted in which case we'll find out at commit
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35 }
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36
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37 public MangledEntry commit(TxnState aState) throws IOException {
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38 MangledEntry myEntry = null;
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39
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40 EntryReposRecovery myRepos =
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41 EntryRepositoryFactory.get().getAdmin(theType);
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42
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43 // System.err.println("Looking for: " + theOID);
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44
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45 CacheBlockDescriptor myCBD = myRepos.load(theOID);
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46
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47 if (myCBD != null) {
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48 // System.err.println("Got CBD: " + theOID);
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49
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50 EntrySleeveImpl mySleeve = (EntrySleeveImpl) myCBD.getContent();
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51
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52 boolean isDeleted = mySleeve.getState().test(SleeveState.DELETED);
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53
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54 if (isTake) {
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55 // System.err.println("Deleted: " + theOID);
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56 mySleeve.getState().set(SleeveState.DELETED);
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57 mySleeve.markDirty();
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58
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59 /*
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60 We could leave this dead entry sitting in cache and wait
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61 for it to be aged out but it's better to force the state
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62 to disk early so as to clean out the database. Of course,
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63 we only do this for stuff that's come from disk - there's
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64 no point in doing it for something that's never been on
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65 disk.
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66
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67 The net effect of this is to improve the ratio of live to
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68 dead data on the disk in favour of liveness which has
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69 benefits for out of cache searching by reducing the number
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70 of disk blocks we scan and skip.
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71 */
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72 if (! mySleeve.getState().test(SleeveState.NOT_ON_DISK)) {
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73 // System.err.println("On disk - early flush: " + theOID);
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74 myRepos.flush(myCBD);
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75 }
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76 } else {
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77 if (!isDeleted)
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78 myEntry = mySleeve.getEntry();
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79 }
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80
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81 myCBD.release();
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82
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83 // Update counters outside lock
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84 if (isTake)
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85 myRepos.getCounters().didTake();
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86 else
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87 myRepos.getCounters().didRead();
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88 }
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89
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90 return myEntry;
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91 }
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92
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93 public MangledEntry abort(TxnState aState) throws IOException {
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94 MangledEntry myEntry = null;
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95
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96 EntryReposRecovery myRepos =
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97 EntryRepositoryFactory.get().getAdmin(theType);
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98
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99 CacheBlockDescriptor myCBD = myRepos.load(theOID);
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100
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101 if (myCBD != null) {
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102
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103 EntrySleeveImpl mySleeve = (EntrySleeveImpl) myCBD.getContent();
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104
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105 if (!mySleeve.getState().test(SleeveState.DELETED))
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106 myEntry = mySleeve.getEntry();
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107
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108 myCBD.release();
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109 }
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110
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111 return myEntry;
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112 }
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113
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114 public OID getOID() {
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115 return theOID;
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116 }
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117
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118 public String getType() {
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119 return theType;
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120 }
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121
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122 public String toString() {
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123 if (isTake)
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124 return "T : " + theType + " : " + theOID;
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125 else
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126 return "R : " + theType + " : " + theOID;
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127 }
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128 }