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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DatabaseCleaner.java @ 231:1ea35226a6de

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Database cleaner: Ignoring locked artifacts is now done on database level. artifacts/trunk@1635 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 31 Mar 2011 15:56:50 +0000
parents fbd57d2eeaef
children 202b6ae2fcad
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.common.utils.Config;
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12
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13 import de.intevation.artifacts.Artifact;
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14
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15 import java.sql.Connection;
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16 import java.sql.PreparedStatement;
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17 import java.sql.ResultSet;
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18 import java.sql.SQLException;
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19
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20 import java.util.ArrayList;
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21 import java.util.List;
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22 import java.util.Set;
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23 import java.util.Collections;
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24
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25 import javax.sql.DataSource;
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26
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27 import org.apache.log4j.Logger;
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28
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29 /**
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30 * The database cleaner runs in background. It sleep for a configurable
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31 * while and when it wakes up it removes outdated artifacts from the
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32 * database. Outdated means that the the last access to the artifact
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33 * is longer aga then the time to live of this artifact.<br>
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34 * Before the artifact is finally removed from the system it is
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35 * revived one last time an the #endOfLife() method of the artifact
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36 * is called.<br>
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37 * The artifact implementations may e.g. use this to remove some extrenal
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38 * resources form the system.
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39 *
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40 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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41 */
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42 public class DatabaseCleaner
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43 extends Thread
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44 {
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45 /**
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46 * Implementors of this interface are able to create a
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47 * living artifact from a given byte array.
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48 */
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49 public interface ArtifactReviver {
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50
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51 /**
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52 * Called to revive an artifact from a given byte array.
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53 * @param factoryName The name of the factory which
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54 * created this artifact.
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55 * @param bytes The bytes of the serialized artifact.
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56 * @return The revived artfiact.
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57 */
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58 Artifact reviveArtifact(String factoryName, byte [] bytes);
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59
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60 } // interface ArtifactReviver
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61
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62 public interface LockedIdsProvider {
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63 Set<Integer> getLockedIds();
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64 } // interface LockedIdsProvider
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65
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66 private static Logger logger = Logger.getLogger(DatabaseCleaner.class);
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67
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68 /**
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69 * Number of artifacts to be loaded at once. Used to
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70 * mitigate the problem of a massive denial of service
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71 * if too many artifacts have died since last cleanup.
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72 */
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73 public static final int MAX_ROWS = 50;
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75 public static final Set<Integer> EMPTY_IDS = Collections.emptySet();
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77 /**
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78 * The SQL statement to select the outdated artifacts.
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79 */
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80 public static final String SQL_OUTDATED =
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81 SQL.get("artifacts.outdated");
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82
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83 /**
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84 * The SQL statement to delete some artifacts from the database.
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85 */
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86 public static final String SQL_DELETE =
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87 SQL.get("artifacts.delete");
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89 /**
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90 * XPath to figure out how long the cleaner should sleep between
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91 * cleanups. This is stored in the global configuration.
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92 */
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93 public static final String SLEEP_XPATH =
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94 "/artifact-database/cleaner/sleep-time/text()";
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96 /**
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97 * Default nap time between cleanups: 5 minutes.
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98 */
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99 public static final long SLEEP_DEFAULT =
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100 5 * 60 * 1000L; // 5 minutes
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102 /**
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103 * The configured nap time.
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104 */
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105 protected long sleepTime;
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106
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107 /**
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108 * Internal locking mechanism to prevent some race conditions.
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109 */
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110 protected Object sleepLock = new Object();
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112 /**
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113 * A reference to the global context.
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114 */
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115 protected Object context;
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116
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117 /**
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118 * A specialized Id filter which only delete some artifacts.
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119 * This is used to prevent deletion of living artifacts.
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120 */
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121 protected LockedIdsProvider lockedIdsProvider;
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123 /**
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124 * The reviver used to bring the dead artifact on last
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125 * time back to live to call endOfLife() on them.
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126 */
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127 protected ArtifactReviver reviver;
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128
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129 /**
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130 * Default constructor.
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131 */
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132 public DatabaseCleaner() {
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133 }
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134
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135 /**
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136 * Constructor to create a cleaner with a given global context
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137 * and a given reviver.
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138 * @param context The global context of the artifact database
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139 * @param reviver The reviver to awake artifact one last time.
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140 */
41
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141 public DatabaseCleaner(Object context, ArtifactReviver reviver) {
30
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142 setDaemon(true);
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143 sleepTime = getSleepTime();
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144 this.context = context;
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145 this.reviver = reviver;
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146 }
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147
90
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148 /**
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149 * Sets the filter that prevents deletion of living artifacts.
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150 * Living artifacts are artifacts which are currently active
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151 * inside the artifact database. Deleting them in this state
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152 * would create severe internal problems.
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153 * @param filter
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154 */
230
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155 public void setLockedIdsProvider(LockedIdsProvider lockedIdsProvider) {
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156 this.lockedIdsProvider = lockedIdsProvider;
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157 }
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158
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159 /**
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160 * External hook to tell the cleaner to wake up before its
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161 * regular nap time is over. This is the case when the artifact
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162 * database finds an artifact which is already outdated.
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163 */
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164 public void wakeup() {
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165 synchronized (sleepLock) {
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166 sleepLock.notify();
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167 }
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168 }
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169
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170 /**
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171 * Fetches the sleep time from the global configuration.
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172 * @return the time to sleep between database cleanups in ms.
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173 */
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174 protected static long getSleepTime() {
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175 String sleepTimeString = Config.getStringXPath(SLEEP_XPATH);
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176
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177 if (sleepTimeString == null) {
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178 return SLEEP_DEFAULT;
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179 }
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180 try {
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181 // sleep at least one second
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182 return Math.max(Long.parseLong(sleepTimeString), 1000L);
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183 }
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184 catch (NumberFormatException nfe) {
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185 logger.warn("Cleaner sleep time defaults to " + SLEEP_DEFAULT);
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186 }
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187 return SLEEP_DEFAULT;
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188 }
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189
230
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190 private static final class IdData {
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191
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192 int id;
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193 byte [] data;
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194 String factoryName;
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195
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196 public IdData(int id, String factoryName, byte [] data) {
230
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197 this.id = id;
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198 this.factoryName = factoryName;
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199 this.data = data;
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200 }
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201 } // class IdData
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202
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203 /**
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204 * Cleaning is done in two phases. First we fetch a list of ids
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205 * of artifacts. If there are artifacts the cleaning is done.
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206 * Second we load the artifacts one by one one and call there
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207 * endOfLife() method. In this loop we remove them from database, too.
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208 * Each deletion is commited to ensure that a sudden failure
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209 * of the artifact database server does delete artifacts twice
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210 * or does not delete them at all. After this the first step
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211 * is repeated.
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212 */
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213 protected void cleanup() {
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214 logger.info("database cleanup");
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215
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216 Connection connection = null;
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217 PreparedStatement fetchIds = null;
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218 PreparedStatement deleteId = null;
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219 ResultSet result = null;
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220
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221 int removedArtifacts = 0;
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222
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223 DataSource dataSource = DBConnection.getDataSource();
231
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224
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225 Set<Integer> lockedIds = lockedIdsProvider != null
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226 ? lockedIdsProvider.getLockedIds()
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227 : EMPTY_IDS;
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228
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229 String questionMarks = StringUtils.repeat('?', lockedIds.size(), ',');
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230
30
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231 try {
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232 connection = dataSource.getConnection();
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233 connection.setAutoCommit(false);
231
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234
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235 fetchIds = connection.prepareStatement(
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236 SQL_OUTDATED.replace("$LOCKED_IDS$", questionMarks));
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237
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diff changeset
238 int idx = 1;
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239 for (Integer id: lockedIds) {
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240 fetchIds.setInt(idx++, id);
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241 }
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242
30
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243 deleteId = connection.prepareStatement(SQL_DELETE);
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244
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245 // some dbms like derby do not support LIMIT
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246 // in SQL statements.
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247 fetchIds.setMaxRows(MAX_ROWS);
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248
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249 for (;;) {
230
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diff changeset
250 List<IdData> ids = new ArrayList<IdData>();
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diff changeset
251
30
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252 result = fetchIds.executeQuery();
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253
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254 while (result.next()) {
231
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255 ids.add(new IdData(
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256 result.getInt(1),
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257 result.getString(2),
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258 result.getBytes(3)));
30
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259 }
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260
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261 result.close(); result = null;
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262
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263 if (ids.isEmpty()) {
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264 break;
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265 }
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266
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267 for (int i = ids.size()-1; i >= 0; --i) {
230
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268 IdData idData = ids.get(i);
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269 Artifact artifact = reviver.reviveArtifact(
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270 idData.factoryName, idData.data);
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271 idData.data = null;
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272
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273 deleteId.setInt(1, idData.id);
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274 deleteId.execute();
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275 connection.commit();
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276
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277 try {
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278 if (artifact != null) {
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279 artifact.endOfLife(context);
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280 }
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281 }
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282 catch (Exception e) {
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283 logger.error(e.getLocalizedMessage(), e);
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284 }
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285 } // for all fetched data
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286
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287 removedArtifacts += ids.size();
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288 }
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289 }
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290 catch (SQLException sqle) {
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291 logger.error(sqle.getLocalizedMessage(), sqle);
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292 }
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293 finally {
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294 if (result != null) {
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295 try { result.close(); }
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296 catch (SQLException sqle) {}
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297 }
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298 if (fetchIds != null) {
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299 try { fetchIds.close(); }
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300 catch (SQLException sqle) {}
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301 }
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302 if (deleteId != null) {
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303 try { deleteId.close(); }
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304 catch (SQLException sqle) {}
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305 }
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306 if (connection != null) {
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307 try { connection.close(); }
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308 catch (SQLException sqle) {}
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309 }
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310 }
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311
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312 logger.info("artifacts removed: " + removedArtifacts);
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313 }
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314
90
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315 /**
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316 * The main code of the cleaner. It sleeps for the configured
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317 * nap time, cleans up the database, sleeps again and so on.
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318 */
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319 @Override
30
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320 public void run() {
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321 logger.info("sleep time: " + sleepTime + "ms");
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322 for (;;) {
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323 cleanup();
48
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324 long startTime = System.currentTimeMillis();
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325
30
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326 try {
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327 synchronized (sleepLock) {
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328 sleepLock.wait(sleepTime);
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329 }
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330 }
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331 catch (InterruptedException ie) {
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332 }
48
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333
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334 long stopTime = System.currentTimeMillis();
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335
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336 if (logger.isDebugEnabled()) {
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337 logger.debug("Cleaner slept " + (stopTime - startTime) + "ms");
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338 }
30
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339 } // for (;;)
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340 }
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341 }
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342 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org