Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/txn/batch/WriteBatcher.java @ 33:0b9265358617
Added tag 2.1.1 for changeset a77f0a9ed93c
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:52:10 +0100 |
parents | 4580bb12db30 |
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rev | line source |
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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 |
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155 return theCommand.execute(theSystem); |
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156 } |
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157 } |
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158 } |
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159 } |