Mercurial > hg > blitz_condensed

annotate src/org/prevayler/implementation/CommandOutputStream.java @ 32:a77f0a9ed93c 2.1.1

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Add support for optimistic log batching.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:42:31 +0100
parents 3dc0c5604566
children
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1 /*
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2 The copyright of all source code included in this Prevayler distribution is
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3 held by Klaus Wuestefeld, except the files that specifically state otherwise.
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4 All rights are reserved. "PREVAYLER" is a trademark of Klaus Wuestefeld.
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5
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6
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7 BSD License:
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8
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9 Redistribution and use in source and binary forms, with or without
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10 modification, are permitted provided that the following conditions are met:
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11
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12 - Redistributions of source code must retain the above copyright notice, this
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13 list of conditions and the following disclaimer.
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14
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15 - Redistributions in binary form must reproduce the above copyright notice,
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16 this list of conditions and the following disclaimer in the documentation
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17 and/or other materials provided with the distribution.
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18
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19 - Neither the name of Prevayler nor the names of its contributors may be used
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20 to endorse or promote products derived from this software without specific
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21 prior written permission.
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22
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23
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24 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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25 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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26 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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27 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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28 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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29 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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30 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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31 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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32 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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33 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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34 POSSIBILITY OF SUCH DAMAGE.
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35 */
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36
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37 package org.prevayler.implementation;
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38
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39 import org.prevayler.*;
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40 import java.io.*;
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41
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42 /** Provides a simple API for writing commands and snapshots.
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43 */
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44 class CommandOutputStream {
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45
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46 /** This number determines the size of the log files produces by the system.
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47 */
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48 public static final long LOG_FILE_SIZE = 100L * 1024L * 1024L;
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49 private final NumberFileCreator fileCreator;
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50 private ObjectOutputStream logStream;
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51 private DelegatingByteCountStream2 fileStream;
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52 private boolean doReset;
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53 private boolean shouldClean;
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54
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55 private int theBufferSize = 0;
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56
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57 public CommandOutputStream(NumberFileCreator fileCreator,
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58 boolean shouldReset, boolean shouldClean) {
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59 this(fileCreator, shouldReset, shouldClean, 0);
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60 }
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61
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62 public CommandOutputStream(NumberFileCreator fileCreator,
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63 boolean shouldReset, boolean doClean,
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64 int bufferSize) {
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65 this.fileCreator = fileCreator;
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66 doReset = shouldReset;
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67 theBufferSize = bufferSize;
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68 shouldClean = doClean;
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69 }
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70
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71 public void writeCommand(Command command) throws IOException{
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72 ObjectOutputStream oos = logStream();
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73 try {
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74 // long myStart = System.currentTimeMillis();
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75
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76 oos.writeObject(command);
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77
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78 if (doReset)
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79 oos.reset(); //You can comment this line if your free RAM is large compared to the size of each commandLog file. If you comment this line, commands will occupy much less space in the log file because their class descriptions will only be written once. Your application will therefore produce much fewer log files. If you comment this line, you must make sure that no command INSTANCE is used more than once in your application with different internal values. "Reset will disregard the state of any objects already written to the stream. The state is reset to be the same as a new ObjectOutputStream. ... Objects previously written to the stream will not be refered to as already being in the stream. They will be written to the stream again." - JDK1.2.2 API documentation.
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80 oos.flush();
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81
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82 // long myEnd = System.currentTimeMillis();
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83
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84 // System.err.println("Log command time: " + (myEnd - myStart));
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85 } catch (IOException iox) {
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86 closeLogStream();
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87 throw iox;
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88 }
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89 }
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90
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91 public void flush() throws IOException {
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92 ObjectOutputStream oos = logStream();
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93 oos.flush();
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94 }
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95
0
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96 public void writeCommand(Command command, boolean doSync)
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97 throws IOException{
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98
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99 ObjectOutputStream oos = logStream();
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100 try {
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101 // long myStart = System.currentTimeMillis();
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102
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103 oos.writeObject(command);
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104
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105 if (doReset)
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106 oos.reset(); //You can comment this line if your free RAM is large compared to the size of each commandLog file. If you comment this line, commands will occupy much less space in the log file because their class descriptions will only be written once. Your application will therefore produce much fewer log files. If you comment this line, you must make sure that no command INSTANCE is used more than once in your application with different internal values. "Reset will disregard the state of any objects already written to the stream. The state is reset to be the same as a new ObjectOutputStream. ... Objects previously written to the stream will not be refered to as already being in the stream. They will be written to the stream again." - JDK1.2.2 API documentation.
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107
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108 if (doSync)
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109 oos.flush();
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110
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111 // long myEnd = System.currentTimeMillis();
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112
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113 // System.err.println("Log command time: " + (myEnd - myStart));
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114
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115 } catch (IOException iox) {
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116 closeLogStream();
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117 throw iox;
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118 }
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119 }
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120
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121 public synchronized Snapshotter writeSnapshot(PrevalentSystem system)
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122 throws IOException{
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123
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124 closeLogStream(); //After every snapshot, a new commandLog file must be started.
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125
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126 SnapshotterImpl mySnapper = new SnapshotterImpl(fileCreator,
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127 shouldClean);
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128 mySnapper.cacheSnapshot(system);
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129
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130 return mySnapper;
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131 }
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132
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133 private ObjectOutputStream logStream() throws IOException{
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134 if(logStream == null) {
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135 fileStream =
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136 new DelegatingByteCountStream2(fileCreator.newLog(),
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137 theBufferSize);
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138 logStream = new ObjectOutputStream(fileStream);
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139 }
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140
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141 if(fileStream.bytesWritten() >= LOG_FILE_SIZE) {
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142 closeLogStream();
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143 return logStream(); //Recursive call.
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144 }
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145
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146 return logStream;
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147 }
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148
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149 private void closeLogStream() throws IOException {
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150 if (logStream == null) return;
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151
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152 logStream.close();
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153 logStream = null;
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154 }
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155
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156 }