Mercurial > hg > blitz_condensed

annotate src/org/dancres/blitz/txn/batch/WriteBatcher.java @ 17:4580bb12db30

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Separate command execution from command logging.
author Dan Creswell <dan.creswell@gmail.com>
date Sun, 05 Jul 2009 16:26:25 +0100
parents 3dc0c5604566
children
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1 package org.dancres.blitz.txn.batch;
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2
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3 import java.io.IOException;
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4 import java.io.Serializable;
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5
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6 import java.util.ArrayList;
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7
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8 import java.util.logging.Logger;
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9 import java.util.logging.Level;
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10
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11 import org.prevayler.Prevayler;
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12 import org.prevayler.PrevalentSystem;
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13 import org.prevayler.Command;
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14
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15 import org.prevayler.implementation.SnapshotPrevayler;
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16 import org.prevayler.implementation.Snapshotter;
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17
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18 import org.dancres.blitz.Logging;
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19 import org.prevayler.implementation.PrevaylerCore;
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20
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21 /**
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22 <p>Batches commands issued in the same time period together in an attempt
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23 to improve log throughput via Prevayler.</p>
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24
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25 <p>Batch-writing can reduce the number of forced flushes to disk whilst
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26 increasing the amount of data written with each flush. This has a
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27 positive effect on throughput under concurrent load.</p>
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28
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29 <p>Time is specified in ms, first thread into barrier waits this amount
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30 of time for other writers. Other writers entering the barrier are
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31 now blocked until the first entrant commits all writes to log. When first
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32 thread awakes, all writes are done as a group followed by a single sync.</p>
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33 */
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34 public class WriteBatcher implements SnapshotPrevayler {
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35 static Logger theLogger =
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36 Logging.newLogger("org.dancres.blitz.txn.LogBatcher");
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37
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38 private PrevaylerCore thePrevayler;
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39
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40 private boolean amFirst = true;
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41
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42 private ArrayList theWrites = new ArrayList();
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43
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44 // Might be able to buff up to 60ms which gives average of 30 but
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45 // we'll see.
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46 private long theWindowTimeMs = 0;
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47 private int theWindowTimeNs = 0;
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48
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49 public WriteBatcher(PrevaylerCore aPrevayler, long aWindowTimeMs, int aWindowTimeNs) {
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50 thePrevayler = aPrevayler;
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51 theWindowTimeMs = aWindowTimeMs;
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52 theWindowTimeNs = aWindowTimeNs;
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53 }
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54
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55 /**
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56 * Returns the underlying PrevalentSystem.
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57 */
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58 public PrevalentSystem system() {
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59 return thePrevayler.system();
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60 }
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61
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62 public Serializable executeCommand(Command aCommand) throws Exception {
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63 return write(aCommand);
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64 }
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65
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66 public Serializable executeCommand(Command aCommand, boolean sync)
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67 throws Exception {
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68 return write(aCommand);
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69 }
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70
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71 private Serializable write(Command aComm) throws Exception {
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72 WriteRequest myReq = new WriteRequest(system(), aComm);
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73
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74 synchronized(this) {
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75 if (amFirst) {
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76 theWrites.add(myReq);
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77 amFirst = false;
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78
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79 try {
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80 wait(theWindowTimeMs, theWindowTimeNs);
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81 } catch (InterruptedException anIE) {
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82 }
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83
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84 flushAll();
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85 amFirst = true;
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86
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87 } else {
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88 theWrites.add(myReq);
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89 }
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90 }
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91
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92 return myReq.getResult();
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93 }
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94
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95 public Snapshotter takeSnapshot() throws IOException {
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96 return thePrevayler.takeSnapshot();
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97 }
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98
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99 private void flushAll() {
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100
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101 if (theLogger.isLoggable(Level.FINE))
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102 theLogger.log(Level.FINE, "Flushing " +
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103 theWrites.size() + " to log");
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104
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105 int myLast = theWrites.size() - 1;
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106
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107 // Do all writes, last with sync
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108 for (int i = 0; i < theWrites.size(); i++) {
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109 WriteRequest myReq = (WriteRequest) theWrites.get(i);
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110
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111 myReq.execute(thePrevayler, (i == myLast));
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112 }
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113
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114 theWrites.clear();
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115 }
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116
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117 private static class WriteRequest {
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118 private Command theCommand;
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119 private PrevalentSystem theSystem;
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120
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121 private Exception theException;
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122
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123 private boolean isDone;
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124
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125 WriteRequest(PrevalentSystem aSystem, Command aCommand) {
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126 theCommand = aCommand;
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127 theSystem = aSystem;
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128 }
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129
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130 void execute(PrevaylerCore aPrev, boolean doSync) {
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131 try {
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132 aPrev.logCommand(theCommand, doSync);
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133 } catch (Exception anE) {
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134 theException = anE;
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135 } finally {
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136 synchronized(this) {
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137 isDone = true;
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138 notify();
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139 }
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140 }
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141 }
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142
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143 Serializable getResult() throws Exception{
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144 synchronized(this) {
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145 while (!isDone) {
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146 try {
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147 wait();
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148 } catch (InterruptedException anIE) {
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149 }
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150 }
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151
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152 if (theException != null)
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153 throw theException;
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154 else
17
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155 return theCommand.execute(theSystem);
0
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156 }
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157 }
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158 }
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159 }