Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DatabaseCleaner.java @ 195:63f555bbdbc0

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Fix a foreign key constraint violation when deleting outdated artifacts. artifacts/trunk@1425 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 08 Mar 2011 10:35:40 +0000
parents 933bbc9fc11f
children b2115f484edb
rev   line source
100
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.artifactdatabase;
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10
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11 import de.intevation.artifacts.Artifact;
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12
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13 import java.sql.Connection;
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14 import java.sql.PreparedStatement;
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15 import java.sql.ResultSet;
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16 import java.sql.SQLException;
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17
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18 import java.util.ArrayList;
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19 import java.util.List;
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20
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21 import javax.sql.DataSource;
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22
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23 import org.apache.log4j.Logger;
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24
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25 /**
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26 * The database cleaner runs in background. It sleep for a configurable
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27 * while and when it wakes up it removes outdated artifacts from the
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28 * database. Outdated means that the the last access to the artifact
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29 * is longer aga then the time to live of this artifact.<br>
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30 * Before the artifact is finally removed from the system it is
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31 * revived one last time an the #endOfLife() method of the artifact
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32 * is called.<br>
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33 * The artifact implementations may e.g. use this to remove some extrenal
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34 * resources form the system.
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35 *
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36 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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37 */
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38 public class DatabaseCleaner
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39 extends Thread
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40 {
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41 /**
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42 * Implementors of this interface are able to create a
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43 * living artifact from a given byte array.
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44 */
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45 public interface ArtifactReviver {
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46
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47 /**
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48 * Called to revive an artifact from a given byte array.
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49 * @param factoryName The name of the factory which
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50 * created this artifact.
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51 * @param bytes The bytes of the serialized artifact.
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52 * @return The revived artfiact.
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53 */
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54 Artifact reviveArtifact(String factoryName, byte [] bytes);
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55
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56 } // interface ArtifactReviver
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57
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58 private static Logger logger = Logger.getLogger(DatabaseCleaner.class);
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59
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60 /**
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61 * Number of artifacts to be loaded at once. Used to
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62 * mitigate the problem of a massive denial of service
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63 * if too many artifacts have died since last cleanup.
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64 */
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65 public static final int MAX_ROWS = 50;
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66
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67 /**
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68 * The SQL statement to select the outdated artifacts.
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69 */
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70 public static final String SQL_OUTDATED =
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71 SQL.get("artifacts.outdated");
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72
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73 /**
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74 * The SQL statement to delete some artifacts from the database.
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75 */
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76 public static final String SQL_DELETE =
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77 SQL.get("artifacts.delete");
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79 /**
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80 * XPath to figure out how long the cleaner should sleep between
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81 * cleanups. This is stored in the global configuration.
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82 */
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83 public static final String SLEEP_XPATH =
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84 "/artifact-database/cleaner/sleep-time/text()";
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86 /**
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87 * Default nap time between cleanups: 5 minutes.
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88 */
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89 public static final long SLEEP_DEFAULT =
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90 5 * 60 * 1000L; // 5 minutes
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92 /**
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93 * The configured nap time.
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94 */
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95 protected long sleepTime;
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97 /**
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98 * Internal locking mechanism to prevent some race conditions.
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99 */
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100 protected Object sleepLock = new Object();
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102 /**
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103 * A reference to the global context.
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104 */
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105 protected Object context;
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106
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107 /**
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108 * A specialized Id filter which only delete some artifacts.
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109 * This is used to prevent deletion of living artifacts.
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110 */
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111 protected Id.Filter filter;
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112
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113 /**
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114 * The reviver used to bring the dead artifact on last
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115 * time back to live to call endOfLife() on them.
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116 */
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117 protected ArtifactReviver reviver;
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118
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119 /**
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120 * Default constructor.
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121 */
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122 public DatabaseCleaner() {
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123 }
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125 /**
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126 * Constructor to create a cleaner with a given global context
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127 * and a given reviver.
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128 * @param context The global context of the artifact database
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129 * @param reviver The reviver to awake artifact one last time.
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130 */
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131 public DatabaseCleaner(Object context, ArtifactReviver reviver) {
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132 setDaemon(true);
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133 sleepTime = getSleepTime();
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134 this.context = context;
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135 this.reviver = reviver;
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136 }
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137
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138 /**
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139 * Sets the filter that prevents deletion of living artifacts.
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140 * Living artifacts are artifacts which are currently active
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141 * inside the artifact database. Deleting them in this state
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142 * would create severe internal problems.
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143 * @param filter
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144 */
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145 public void setFilter(Id.Filter filter) {
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146 this.filter = filter;
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147 }
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148
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149 /**
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150 * External hook to tell the cleaner to wake up before its
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151 * regular nap time is over. This is the case when the artifact
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152 * database finds an artifact which is already outdated.
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153 */
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154 public void wakeup() {
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155 synchronized (sleepLock) {
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156 sleepLock.notify();
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157 }
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158 }
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159
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160 /**
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161 * Fetches the sleep time from the global configuration.
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162 * @return the time to sleep between database cleanups in ms.
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163 */
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164 protected static long getSleepTime() {
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165 String sleepTimeString = Config.getStringXPath(SLEEP_XPATH);
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166
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167 if (sleepTimeString == null) {
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168 return SLEEP_DEFAULT;
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169 }
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170 try {
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171 // sleep at least one second
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172 return Math.max(Long.parseLong(sleepTimeString), 1000L);
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173 }
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174 catch (NumberFormatException nfe) {
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175 logger.warn("Cleaner sleep time defaults to " + SLEEP_DEFAULT);
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176 }
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177 return SLEEP_DEFAULT;
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178 }
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179
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180 private static final class IdData
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181 extends Id
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182 {
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183 byte [] data;
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184 String factoryName;
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185
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186 public IdData(int id, String factoryName, byte [] data) {
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187 super(id);
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188 this.factoryName = factoryName;
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189 this.data = data;
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190 }
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191 } // class IdData
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192
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193 /**
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194 * Cleaning is done in two phases. First we fetch a list of ids
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195 * of artifacts. If there are artifacts the cleaning is done.
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196 * Second we load the artifacts one by one one and call there
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197 * endOfLife() method. In this loop we remove them from database, too.
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198 * Each deletion is commited to ensure that a sudden failure
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199 * of the artifact database server does delete artifacts twice
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200 * or does not delete them at all. After this the first step
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201 * is repeated.
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202 */
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203 protected void cleanup() {
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204 logger.info("database cleanup");
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205
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206 Connection connection = null;
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207 PreparedStatement fetchIds = null;
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208 PreparedStatement deleteId = null;
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209 ResultSet result = null;
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210
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211 int removedArtifacts = 0;
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212
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213 DataSource dataSource = DBConnection.getDataSource();
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214 try {
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215 connection = dataSource.getConnection();
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216 connection.setAutoCommit(false);
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217 fetchIds = connection.prepareStatement(SQL_OUTDATED);
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218 deleteId = connection.prepareStatement(SQL_DELETE);
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219
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220 // some dbms like derby do not support LIMIT
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221 // in SQL statements.
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222 fetchIds.setMaxRows(MAX_ROWS);
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223
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224 for (;;) {
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225 List ids = new ArrayList();
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226
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227 result = fetchIds.executeQuery();
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228
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229 while (result.next()) {
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230 ids.add(new IdData(
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231 result.getInt(1),
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232 result.getString(2),
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233 result.getBytes(3)));
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234 }
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235
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236 result.close(); result = null;
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237
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238 if (ids.isEmpty()) {
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239 break;
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240 }
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241
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242 if (filter != null) {
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243 ids = filter.filterIds(ids);
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244 }
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245
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246 for (int i = ids.size()-1; i >= 0; --i) {
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247 IdData idData = (IdData)ids.get(i);
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248 Artifact artifact = reviver.reviveArtifact(
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249 idData.factoryName, idData.data);
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250 idData.data = null;
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251
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252 deleteId.setInt(1, idData.id);
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253 deleteId.execute();
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254 connection.commit();
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255
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256 try {
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257 if (artifact != null) {
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258 artifact.endOfLife(context);
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259 }
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260 }
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261 catch (Exception e) {
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262 logger.error(e.getLocalizedMessage(), e);
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263 }
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264 } // for all fetched data
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265
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266 removedArtifacts += ids.size();
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267 }
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268 }
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269 catch (SQLException sqle) {
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270 logger.error(sqle.getLocalizedMessage(), sqle);
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271 }
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272 finally {
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273 if (result != null) {
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274 try { result.close(); }
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275 catch (SQLException sqle) {}
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276 }
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277 if (fetchIds != null) {
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278 try { fetchIds.close(); }
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279 catch (SQLException sqle) {}
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280 }
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281 if (deleteId != null) {
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282 try { deleteId.close(); }
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283 catch (SQLException sqle) {}
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284 }
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285 if (connection != null) {
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286 try { connection.close(); }
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287 catch (SQLException sqle) {}
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288 }
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289 }
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290
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291 logger.info("artifacts removed: " + removedArtifacts);
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292 }
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293
90
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294 /**
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295 * The main code of the cleaner. It sleeps for the configured
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296 * nap time, cleans up the database, sleeps again and so on.
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297 */
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298 @Override
30
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299 public void run() {
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300 logger.info("sleep time: " + sleepTime + "ms");
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301 for (;;) {
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302 cleanup();
48
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303 long startTime = System.currentTimeMillis();
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304
30
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305 try {
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306 synchronized (sleepLock) {
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307 sleepLock.wait(sleepTime);
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308 }
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309 }
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310 catch (InterruptedException ie) {
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311 }
48
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312
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313 long stopTime = System.currentTimeMillis();
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314
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315 if (logger.isDebugEnabled()) {
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316 logger.debug("Cleaner slept " + (stopTime - startTime) + "ms");
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317 }
30
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318 } // for (;;)
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319 }
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320 }
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321 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org