Mercurial > hg > blitz_stable

annotate src/org/prevayler/implementation/SnapshotPrevaylerImpl.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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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 java.util.Date;
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40 import java.io.*;
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41
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42 import java.rmi.RMISecurityManager;
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43
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44 import org.prevayler.*;
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45
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46 /** Provides transparent persistence for business objects.
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47 * This applies to any deterministic system implementing the PrevalentSystem interface.
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48 * All commands to the system must be represented as objects implementing the Command interface and must be executed using Prevayler.executeCommand(Command).
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49 * Take a look at the demo application included with the Prevayler distribution for examples.
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50 */
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51 public class SnapshotPrevaylerImpl implements SnapshotPrevayler {
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52
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53 private final PrevalentSystem system;
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54 private final SystemClock clock;
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55 private final CommandOutputStream output;
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56
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57
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58 /** Returns a new Prevayler for the given PrevalentSystem.
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59 * "PrevalenceBase" shall be the directory where the snapshot and log files shall be created and read.
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60 * @param newSystem The newly started, "empty" PrevalentSystem that will be used as a starting point for every system startup, until the first snapshot is taken.
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61 * @param shouldReset Whether to issue resets in the underlying OOS
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62 */
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63 public SnapshotPrevaylerImpl(PrevalentSystem newSystem,
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64 boolean shouldReset, boolean shouldClean,
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65 int aBufferSize)
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66 throws IOException, ClassNotFoundException {
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67
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68 this(newSystem, "PrevalenceBase", shouldReset, shouldClean,
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69 aBufferSize);
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70 }
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71
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72
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73 /** Returns a new Prevayler for the given PrevalentSystem.
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74 * @param newSystem The newly started, "empty" PrevalentSystem that will be used as a starting point for every system startup, until the first snapshot is taken.
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75 * @param directory The full path of the directory where the snapshot and log files shall be created and read.
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76 * @param shouldReset Whether to issue resets in the underlying OOS
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77 */
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78 public SnapshotPrevaylerImpl(PrevalentSystem newSystem, String directory,
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79 boolean shouldReset, boolean shouldClean,
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80 int aBufferSize)
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81 throws IOException, ClassNotFoundException {
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82
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83 newSystem.clock(new SystemClock());
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84 CommandInputStream input = new CommandInputStream(directory);
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85
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86 PrevalentSystem savedSystem = input.readLastSnapshot();
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87 system = (savedSystem == null)
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88 ? newSystem
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89 : savedSystem;
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90
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91 recoverCommands(input);
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92
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93 output = input.commandOutputStream(shouldReset, shouldClean,
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94 aBufferSize);
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95 clock = (SystemClock)system.clock();
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96 clock.resume();
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97 }
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98
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99 public SnapshotPrevaylerImpl(PrevalentSystem newSystem, String directory)
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100 throws IOException, ClassNotFoundException {
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101
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102 clock = null;
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103 output = null;
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104
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105 newSystem.clock(new SystemClock());
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106 CommandInputStream input = new CommandInputStream(directory);
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107
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108 PrevalentSystem savedSystem = input.readLastSnapshot();
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109
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110 if (savedSystem != null)
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111 system = savedSystem;
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112 else
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113 system = newSystem;
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114
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115 System.out.println("System base clock: " + system.clock().time().getTime());
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116 Serializable[] myUserData = system.getSnapshotContributions();
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117
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118 for (int i = 0; i < myUserData.length; i++) {
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119 System.out.println(myUserData[i].toString());
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120 }
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121
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122 debugCommands(input);
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123 }
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124
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125 /**
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126 Returns the underlying PrevalentSystem.
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127 */
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128 public PrevalentSystem system() {
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129 return system;
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130 }
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131
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132 /** Logs the received command for crash or shutdown recovery and executes it on the underlying PrevalentSystem.
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133 * @see system()
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134 * @return The serializable object that was returned by the execution of command.
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135 * @throws IOException if there is trouble writing the command to the log.
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136 * @throws Exception if command.execute() throws an exception.
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137 */
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138 public Serializable executeCommand(Command command) throws Exception {
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139
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140 synchronized(this) {
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141 try {
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142 clock.pause(); //To be deterministic, the system must know exactly at what time the command is being executed.
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143 output.writeCommand(new ClockRecoveryCommand(command, clock.time()));
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144 } finally {
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145 clock.resume();
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Dan Creswell <dan.creswell@gmail.com>
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146 }
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147 }
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148
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149 return command.execute(system);
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150 }
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151
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152 public Serializable executeCommand(Command command,
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153 boolean doSync)
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154 throws Exception {
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155
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156 synchronized(this) {
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157 try {
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158 clock.pause();
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159 output.writeCommand(new ClockRecoveryCommand(command,
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160 clock.time()),
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161 doSync);
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162 } finally {
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163 clock.resume();
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164 }
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165 }
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166
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167 return command.execute(system);
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168 }
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169
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170 /**
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171 * This method prepares a snapshot of the system and returns it in a
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172 * Snapshotter instance which can be used to save the snapshot to disk
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173 * once dirty state has been sync'd to disk. If your application has no
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174 * additional state, you can simply invoke on the Snapshotter immediately.
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175 * @return Snapshotter to be used to save an appropriate snapshot post
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176 * sync'ing of dirty state to disk.
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177 * @see system()
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178 * @throws IOException if there is trouble preparing the snapshot file.
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179 */
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180 public synchronized Snapshotter takeSnapshot() throws IOException {
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181 clock.pause();
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182 try {
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183 return output.writeSnapshot(system);
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Dan Creswell <dan.creswell@gmail.com>
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184 } finally {
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185 clock.resume();
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186 }
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187 }
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188
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189 private void debugCommands(CommandInputStream input) throws IOException, ClassNotFoundException {
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190 Command command;
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191 while(true) {
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192 try {
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193 command = input.readCommand();
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194 } catch (EOFException eof) {
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195 break;
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196 }
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197
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198 try {
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199 System.out.println(command);
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200 System.out.println();
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201 // command.execute(system);
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Dan Creswell <dan.creswell@gmail.com>
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202 } catch (Exception e) {
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
203 //Don't do anything at all. Commands may throw exceptions normally.
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204 System.err.println("Command threw exception");
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Dan Creswell <dan.creswell@gmail.com>
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205 e.printStackTrace(System.err);
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Dan Creswell <dan.creswell@gmail.com>
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206 }
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207 }
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208 }
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209
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210 private void recoverCommands(CommandInputStream input) throws IOException, ClassNotFoundException {
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211 Command command;
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diff changeset
212 while(true) {
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diff changeset
213 try {
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214 command = input.readCommand();
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Dan Creswell <dan.creswell@gmail.com>
parents:
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215 } catch (EOFException eof) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
216 break;
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
217 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
218
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
219 try {
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220 command.execute(system);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
221 } catch (Exception e) {
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parents:
diff changeset
222 //Don't do anything at all. Commands may throw exceptions normally.
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223 System.err.println("Command threw exception");
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Dan Creswell <dan.creswell@gmail.com>
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224 e.printStackTrace(System.err);
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
225 }
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226 }
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Dan Creswell <dan.creswell@gmail.com>
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227 }
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228
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229 public static void main(String anArgs[]) {
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230 try {
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231 System.setSecurityManager(new RMISecurityManager());
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diff changeset
232
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233 new SnapshotPrevaylerImpl(new DebugSystem(), anArgs[0]);
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
234 } catch (Exception anE) {
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Dan Creswell <dan.creswell@gmail.com>
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235 System.err.println("Whoops");
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
236 anE.printStackTrace(System.err);
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
237 }
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238 }
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239
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Dan Creswell <dan.creswell@gmail.com>
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240 static class DebugSystem implements org.prevayler.PrevalentSystem {
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241 private org.prevayler.AlarmClock theClock;
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242
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243 public void clock(org.prevayler.AlarmClock clock) {
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244 theClock = clock;
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Dan Creswell <dan.creswell@gmail.com>
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245 }
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parents:
diff changeset
246
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247 public org.prevayler.AlarmClock clock() {
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diff changeset
248 return theClock;
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249 }
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diff changeset
250
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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251 public void add(SnapshotContributor aContributor) {
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252 }
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253
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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254 public void remove(SnapshotContributor aContributor) {
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255 }
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parents:
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256
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257 public Serializable[] getSnapshotContributions() {
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diff changeset
258 return new Serializable[0];
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Dan Creswell <dan.creswell@gmail.com>
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259 }
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260 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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261 }