Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/txn/batch/WriteBatcher.java @ 8:fa7203ea1622

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Remove some dead code (Dave Brosius)
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 23 May 2009 11:27:41 +0100
parents 3dc0c5604566
children 4580bb12db30
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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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
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20 /**
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21 <p>Batches commands issued in the same time period together in an attempt
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22 to improve log throughput via Prevayler.</p>
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23
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24 <p>Batch-writing can reduce the number of forced flushes to disk whilst
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25 increasing the amount of data written with each flush. This has a
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26 positive effect on throughput under concurrent load.</p>
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27
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28 <p>Time is specified in ms, first thread into barrier waits this amount
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29 of time for other writers. Other writers entering the barrier are
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30 now blocked until the first entrant commits all writes to log. When first
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31 thread awakes, all writes are done as a group followed by a single sync.</p>
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32 */
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33 public class WriteBatcher implements SnapshotPrevayler {
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34 static Logger theLogger =
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35 Logging.newLogger("org.dancres.blitz.txn.LogBatcher");
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36
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37 private SnapshotPrevayler thePrevayler;
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38
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39 private boolean amFirst = true;
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40
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41 private ArrayList theWrites = new ArrayList();
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42
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43 // Might be able to buff up to 60ms which gives average of 30 but
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44 // we'll see.
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45 private long theWindowTime = 20;
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46
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47 public WriteBatcher(SnapshotPrevayler aPrevayler, long aWindowTime) {
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48 thePrevayler = aPrevayler;
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49 theWindowTime = aWindowTime;
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50 }
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51
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52 /**
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53 * Returns the underlying PrevalentSystem.
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54 */
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55 public PrevalentSystem system() {
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56 return thePrevayler.system();
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57 }
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58
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59 public Serializable executeCommand(Command aCommand) throws Exception {
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60 return write(aCommand);
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61 }
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62
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63 public Serializable executeCommand(Command aCommand, boolean sync)
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64 throws Exception {
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65 return write(aCommand);
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66 }
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67
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68 private Serializable write(Command aComm) throws Exception {
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69 WriteRequest myReq = new WriteRequest(aComm);
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70
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71 synchronized(this) {
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72 if (amFirst) {
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73 theWrites.add(myReq);
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74 amFirst = false;
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75
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76 try {
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77 wait(theWindowTime);
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78 } catch (InterruptedException anIE) {
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79 }
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80
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81 flushAll();
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82 amFirst = true;
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83
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84 } else {
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85 theWrites.add(myReq);
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86 }
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87 }
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88
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89 return myReq.getResult();
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90 }
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91
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92 public Snapshotter takeSnapshot() throws IOException {
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93 return thePrevayler.takeSnapshot();
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94 }
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95
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96 private void flushAll() {
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97
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98 if (theLogger.isLoggable(Level.FINE))
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99 theLogger.log(Level.FINE, "Flushing " +
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100 theWrites.size() + " to log");
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101
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102 int myLast = theWrites.size() - 1;
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103
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104 // Do all writes, last with sync
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105 for (int i = 0; i < theWrites.size(); i++) {
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106 WriteRequest myReq = (WriteRequest) theWrites.get(i);
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107
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108 myReq.execute(thePrevayler, (i == myLast));
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109 }
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110
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111 theWrites.clear();
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112 }
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113
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114 private static class WriteRequest {
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115 private Command theCommand;
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116
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117 private Exception theException;
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118 private Serializable theResult;
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119
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120 private boolean isDone;
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121
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122 WriteRequest(Command aCommand) {
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123 theCommand = aCommand;
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124 }
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125
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126 void execute(Prevayler aPrev, boolean doSync) {
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127 try {
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128 theResult = aPrev.executeCommand(theCommand, doSync);
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129 } catch (Exception anE) {
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130 theException = anE;
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131 } finally {
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132 synchronized(this) {
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133 isDone = true;
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134 notify();
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135 }
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136 }
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137 }
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138
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139 Serializable getResult() throws Exception{
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140 synchronized(this) {
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141 while (!isDone) {
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142 try {
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143 wait();
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144 } catch (InterruptedException anIE) {
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145 }
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146 }
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147
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148 if (theException != null)
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149 throw theException;
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150 else
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151 return theResult;
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152 }
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153 }
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154 }
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155 }