Mercurial > hg > blitz_condensed

annotate src/org/dancres/blitz/txn/batch/ConcurrentWriteBatcher.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.Level;
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9
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10 import org.prevayler.PrevalentSystem;
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11 import org.prevayler.Command;
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12
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13 import org.prevayler.implementation.SnapshotPrevayler;
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14 import org.prevayler.implementation.PrevaylerCore;
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15 import org.prevayler.implementation.Snapshotter;
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16
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17 /**
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18 <p>Batches commands issued in the same time period together in an attempt
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19 to improve log throughput via Prevayler.</p>
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20
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21 <p>Batch-writing can reduce the number of forced flushes to disk whilst
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22 increasing the amount of data written with each flush. This has a
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23 positive effect on throughput under concurrent load.</p>
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24
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25 <p>Time is specified in ms, first thread into barrier waits this amount
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26 of time for other writers. Other writers entering the barrier are
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27 now blocked until the first entrant commits all writes to log. When first
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28 thread awakes, all writes are done as a group followed by a single sync.</p>
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29
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30 <p>Unlike <code>WriteBatcher</code>, this version supports more concurrency
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31 allowing for queuing of the next batch of log entries whilst the current
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32 bunch is being written.</p>
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33 */
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34 public class ConcurrentWriteBatcher implements SnapshotPrevayler {
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35 private PrevaylerCore thePrevayler;
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36
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37 private boolean amFirst = true;
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38
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39 private ArrayList theWrites = new ArrayList();
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40
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41 // Might be able to buff up to 60ms which gives average of 30 but
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42 // we'll see.
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43 private long theWindowTimeMs = 20;
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44 private int theWindowTimeNs = 0;
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45
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46
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47 public ConcurrentWriteBatcher(PrevaylerCore aPrevayler,
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48 long aWindowTimeMs, int aWindowTimeNs) {
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49
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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(aComm, system());
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73
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74 boolean wasFirst = false;
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75
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76 WriteRequest[] myRequests = null;
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77
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78 synchronized(this) {
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79 if (amFirst) {
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80 theWrites.add(myReq);
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81 amFirst = false;
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82 wasFirst = true;
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83
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84 try {
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85 wait(theWindowTimeMs, theWindowTimeNs);
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86 } catch (InterruptedException anIE) {
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87 }
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88
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89 myRequests = new WriteRequest[theWrites.size()];
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90 myRequests = (WriteRequest[]) theWrites.toArray(myRequests);
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91
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92 theWrites.clear();
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93 amFirst = true;
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94
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95 } else {
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96 theWrites.add(myReq);
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97 }
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98 }
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99
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100 if (wasFirst) {
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101 flushAll(myRequests);
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102 }
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103
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104 return myReq.getResult();
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105 }
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106
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107 public Snapshotter takeSnapshot() throws IOException {
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108 return thePrevayler.takeSnapshot();
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109 }
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110
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111 private void flushAll(WriteRequest[] aRequests) {
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112 int myLast = aRequests.length - 1;
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113
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114 if (WriteBatcher.theLogger.isLoggable(Level.FINE))
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115 WriteBatcher.theLogger.log(Level.FINE,
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116 "Flushing " +
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117 aRequests.length + " to log");
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118
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119 // Do all writes, last with sync
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120 for (int i = 0; i < aRequests.length; i++) {
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121 WriteRequest myReq = aRequests[i];
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122
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123 myReq.execute(thePrevayler, (i == myLast));
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124 }
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125 }
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126
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127 private static class WriteRequest {
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128 private PrevalentSystem theSystem;
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129 private Command theCommand;
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130
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131 private Exception theException;
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132
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133 private boolean isDone;
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134
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135 WriteRequest(Command aCommand, PrevalentSystem aSystem) {
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136 theCommand = aCommand;
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137 theSystem = aSystem;
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138 }
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139
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140 void execute(PrevaylerCore aPrev, boolean doSync) {
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141 try {
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142 aPrev.logCommand(theCommand, doSync);
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143 } catch (Exception anE) {
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144 theException = anE;
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145 } finally {
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146 synchronized(this) {
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147 isDone = true;
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148 notify();
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149 }
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150 }
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151 }
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152
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153 Serializable getResult() throws Exception{
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154 synchronized(this) {
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155 while (!isDone) {
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156 try {
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157 wait();
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158 } catch (InterruptedException anIE) {
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159 }
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160 }
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161 }
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162
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163 if (theException != null)
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164 throw theException;
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165 else {
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166 Serializable myResult = theCommand.execute(theSystem);
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167 return myResult;
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168 }
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169 }
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170 }
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171 }