Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/EntryTxnOp.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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1 package org.dancres.blitz;
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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.entry.OpInfo;
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8
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9 import org.dancres.blitz.txn.TxnOp;
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10 import org.dancres.blitz.txn.TxnState;
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11
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12 import org.dancres.blitz.txnlock.*;
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13
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14 import org.dancres.blitz.notify.QueueEvent;
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15 import org.dancres.blitz.notify.EventQueue;
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16
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17 /**
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18 Each operation against an Entry is represented by an instance of this class.
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19 These are stored in <code>TxnState</code> instances and constitute part of
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20 the record of operations performed by a particular transaction.
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21
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22 @see org.dancres.blitz.txn.TxnState
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23
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24 @todo As postEvent happens before txnlock is released one can get
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25 temporary conflicts which could be alleviated if txnlock was released first
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26 but to do this would mean needing a snapshot of txnlock state from before
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27 the release was performed.
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28 */
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29 class EntryTxnOp implements TxnOp {
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30 static final long serialVersionUID = -347168809827671347L;
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31
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32 /**
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33 Required when we figure out what lock type to assert.
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34 Lock is transient because it's a memory only structure so we will
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35 have to recover it if necessary.
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36 */
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37 private int theOp;
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38 private OpInfo theInfo;
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39
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40 private transient TxnLock theTxnLock;
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41
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42 EntryTxnOp(OpInfo anInfo) {
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43 theInfo = anInfo;
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44 }
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45
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46 EntryTxnOp(int anOp, OpInfo anInfo, TxnLock aLock) {
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47 theOp = anOp;
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48 theInfo = anInfo;
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49 theTxnLock = aLock;
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50 }
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51
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52 public void restore(TxnState aState) throws IOException {
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53 if (theInfo.isDebugOp())
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54 return;
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55
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56 theInfo.restore();
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57
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58 LockMgr myMgr = TxnLocks.getLockMgr(theInfo.getType());
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59 theTxnLock = myMgr.getLock(theInfo.getOID());
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60
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61 synchronized(theTxnLock) {
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62 theTxnLock.acquire(aState, theOp, null, null, true);
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63 }
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64 }
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65
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66 public void commit(TxnState aState) throws IOException {
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67 if (theInfo.isDebugOp())
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68 return;
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69
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70 MangledEntry myEntry = theInfo.commit(aState);
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71
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72 postEvent(aState, myEntry, true);
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73
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74 theTxnLock.release(aState, theOp);
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75 }
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76
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77 public void abort(TxnState aState) throws IOException {
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78 if (theInfo.isDebugOp())
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79 return;
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80
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81 MangledEntry myEntry = theInfo.abort(aState);
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82
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83 postEvent(aState, myEntry, false);
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84
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85 theTxnLock.release(aState, theOp);
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86 }
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87
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88 public String toString() {
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89 return theInfo.toString();
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90 }
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91
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92 private void postEvent(TxnState aState, MangledEntry anEntry,
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93 boolean isCommit) {
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94
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95 // No Entry means no Event - if Entry is present, we then need to
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96 // figure out whether or not we generate an event based on commit/abort
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97 // and the kind of operation
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98 if (anEntry == null)
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99 return;
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100
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101 switch (theOp) {
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102 case TxnLock.READ : {
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103 if (theTxnLock.hasOnly(aState.getId(), TxnLock.READ)) {
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104 // Entry still exists and we are the last outstanding
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105 // read - which means we resolve a conflict
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106 QueueEvent myEvent =
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107 new QueueEvent(QueueEvent.ENTRY_NOT_CONFLICTED, aState,
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108 new QueueEvent.Context(anEntry,
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109 theInfo.getOID()));
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110
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111 EventQueue.get().add(myEvent);
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112 }
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113
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114 break;
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115 }
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116
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117 case TxnLock.DELETE : {
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118 if (!isCommit) {
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119 // We're aborting a take, if we wrote this Entry
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120 // we shouldn't generate an Event
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121 if (!theTxnLock.hasWriter(aState.getId())) {
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122 QueueEvent myEvent =
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123 new QueueEvent(QueueEvent.ENTRY_VISIBLE, aState,
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124 new QueueEvent.Context(anEntry,
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125 theInfo.getOID()));
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126
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127 EventQueue.get().add(myEvent);
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128 }
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129 }
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130 break;
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131 }
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132
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133 /**
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134 * If we've been doing a write, the Entry is pinned and cannot
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135 * be flushed from cache thus even if it becomes lease expired
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136 * it will be present in cache when we query it.
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137 */
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138 case TxnLock.WRITE : {
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139 if (isCommit) {
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140 // If we're commiting a write, an Entry became visible
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141 QueueEvent myEvent =
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142 new QueueEvent(QueueEvent.ENTRY_WRITTEN,
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143 aState,
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144 new QueueEvent.Context(anEntry, theInfo.getOID()));
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145 EventQueue.get().add(myEvent);
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146 }
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147 break;
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148 }
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149 }
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150 }
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151 }