Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DatabaseCleaner.java @ 453:a2efc9d65a11 2.9.8

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author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Fri, 28 Dec 2012 13:32:32 +0100
parents f367be55dd35
children
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 import de.intevation.artifacts.common.utils.StringUtils;
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13
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14 import de.intevation.artifacts.Artifact;
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16 import de.intevation.artifactdatabase.db.SQL;
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17 import de.intevation.artifactdatabase.db.DBConnection;
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18
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19 import java.sql.Connection;
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20 import java.sql.PreparedStatement;
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21 import java.sql.ResultSet;
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22 import java.sql.SQLException;
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23
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24 import java.util.ArrayList;
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25 import java.util.List;
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26 import java.util.Set;
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27 import java.util.Collections;
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29 import javax.sql.DataSource;
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30
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31 import org.apache.log4j.Logger;
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32
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33 /**
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34 * The database cleaner runs in background. It sleep for a configurable
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35 * while and when it wakes up it removes outdated artifacts from the
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36 * database. Outdated means that the the last access to the artifact
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37 * is longer aga then the time to live of this artifact.<br>
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38 * Before the artifact is finally removed from the system it is
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39 * revived one last time an the #endOfLife() method of the artifact
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40 * is called.<br>
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41 * The artifact implementations may e.g. use this to remove some extrenal
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42 * resources form the system.
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43 *
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44 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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45 */
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46 public class DatabaseCleaner
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47 extends Thread
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48 {
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49 /**
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50 * Implementors of this interface are able to create a
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51 * living artifact from a given byte array.
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52 */
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53 public interface ArtifactReviver {
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54
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55 /**
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56 * Called to revive an artifact from a given byte array.
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57 * @param factoryName The name of the factory which
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58 * created this artifact.
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59 * @param bytes The bytes of the serialized artifact.
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60 * @return The revived artfiact.
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61 */
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62 Artifact reviveArtifact(String factoryName, byte [] bytes);
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64 void killedArtifacts(List<String> identifiers);
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65 void killedCollections(List<String> identifiers);
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67 } // interface ArtifactReviver
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69 public interface LockedIdsProvider {
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70 Set<Integer> getLockedIds();
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71 } // interface LockedIdsProvider
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72
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73 private static Logger logger = Logger.getLogger(DatabaseCleaner.class);
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75 /**
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76 * Number of artifacts to be loaded at once. Used to
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77 * mitigate the problem of a massive denial of service
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78 * if too many artifacts have died since last cleanup.
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79 */
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80 public static final int MAX_ROWS = 50;
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82 public static final Set<Integer> EMPTY_IDS = Collections.emptySet();
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83
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84 /**
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85 * The SQL statement to select the outdated artifacts.
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86 */
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87 public String SQL_OUTDATED;
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89 public String SQL_OUTDATED_COLLECTIONS;
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90 public String SQL_DELETE_COLLECTION_ITEMS;
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91 public String SQL_DELETE_COLLECTION;
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93 /**
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94 * The SQL statement to delete some artifacts from the database.
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95 */
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96 public String SQL_DELETE_ARTIFACT;
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98 /**
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99 * XPath to figure out how long the cleaner should sleep between
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100 * cleanups. This is stored in the global configuration.
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101 */
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102 public static final String SLEEP_XPATH =
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103 "/artifact-database/cleaner/sleep-time/text()";
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105 /**
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106 * Default nap time between cleanups: 5 minutes.
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107 */
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108 public static final long SLEEP_DEFAULT =
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109 5 * 60 * 1000L; // 5 minutes
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111 /**
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112 * The configured nap time.
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113 */
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114 protected long sleepTime;
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116 /**
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117 * Internal locking mechanism to prevent some race conditions.
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118 */
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119 protected Object sleepLock = new Object();
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121 /**
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122 * A reference to the global context.
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123 */
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124 protected Object context;
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125
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126 /**
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127 * A specialized Id filter which only delete some artifacts.
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128 * This is used to prevent deletion of living artifacts.
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129 */
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130 protected LockedIdsProvider lockedIdsProvider;
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132 /**
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133 * The reviver used to bring the dead artifact on last
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134 * time back to live to call endOfLife() on them.
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135 */
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136 protected ArtifactReviver reviver;
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137
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138 protected DBConnection dbConnection;
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139
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140 /**
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141 * Default constructor.
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142 */
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143 public DatabaseCleaner() {
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144 }
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145
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146 /**
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147 * Constructor to create a cleaner with a given global context
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148 * and a given reviver.
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149 * @param context The global context of the artifact database
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150 * @param reviver The reviver to awake artifact one last time.
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151 */
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152 public DatabaseCleaner(Object context, ArtifactReviver reviver, DBConfig config) {
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153 setDaemon(true);
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154 sleepTime = getSleepTime();
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155 this.context = context;
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156 this.reviver = reviver;
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157 this.dbConnection = config.getDBConnection();
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158 setupSQL(config.getSQL());
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159 }
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160
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161 protected void setupSQL(SQL sql) {
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162 SQL_OUTDATED = sql.get("artifacts.outdated");
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163 SQL_OUTDATED_COLLECTIONS = sql.get("collections.outdated");
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164 SQL_DELETE_COLLECTION_ITEMS = sql.get("delete.collection.items");
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165 SQL_DELETE_COLLECTION = sql.get("delete.collection");
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166 SQL_DELETE_ARTIFACT = sql.get("artifacts.delete");
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167 }
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168
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169 /**
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170 * Sets the filter that prevents deletion of living artifacts.
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171 * Living artifacts are artifacts which are currently active
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172 * inside the artifact database. Deleting them in this state
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173 * would create severe internal problems.
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174 */
230
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175 public void setLockedIdsProvider(LockedIdsProvider lockedIdsProvider) {
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176 this.lockedIdsProvider = lockedIdsProvider;
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177 }
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178
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179 /**
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180 * External hook to tell the cleaner to wake up before its
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181 * regular nap time is over. This is the case when the artifact
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182 * database finds an artifact which is already outdated.
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183 */
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184 public void wakeup() {
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185 synchronized (sleepLock) {
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186 sleepLock.notify();
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187 }
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188 }
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189
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190 /**
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191 * Fetches the sleep time from the global configuration.
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192 * @return the time to sleep between database cleanups in ms.
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193 */
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194 protected static long getSleepTime() {
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195 String sleepTimeString = Config.getStringXPath(SLEEP_XPATH);
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196
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197 if (sleepTimeString == null) {
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198 return SLEEP_DEFAULT;
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199 }
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200 try {
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201 // sleep at least one second
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202 return Math.max(Long.parseLong(sleepTimeString), 1000L);
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203 }
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204 catch (NumberFormatException nfe) {
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205 logger.warn("Cleaner sleep time defaults to " + SLEEP_DEFAULT);
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206 }
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207 return SLEEP_DEFAULT;
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208 }
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209
314
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210 private static class IdIdentifier {
230
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211
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212 int id;
314
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213 String identifier;
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214
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215 private IdIdentifier(int id, String identifier) {
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216 this.id = id;
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217 this.identifier = identifier;
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218 }
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219 } // class IdIdentifier
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220
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221 private static final class IdData
314
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222 extends IdIdentifier
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223 {
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224 byte [] data;
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225 String factoryName;
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226
314
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227 public IdData(
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228 int id,
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229 String factoryName,
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230 byte [] data,
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231 String identifier
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232 ) {
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233 super(id, identifier);
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234 this.factoryName = factoryName;
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235 this.data = data;
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236 }
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237 } // class IdData
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238
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239 /**
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240 * Cleaning is done in two phases. First we fetch a list of ids
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241 * of artifacts. If there are artifacts the cleaning is done.
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242 * Second we load the artifacts one by one one and call there
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243 * endOfLife() method. In this loop we remove them from database, too.
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244 * Each deletion is commited to ensure that a sudden failure
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245 * of the artifact database server does delete artifacts twice
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246 * or does not delete them at all. After this the first step
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247 * is repeated.
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248 */
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249 protected void cleanup() {
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250 logger.info("database cleanup");
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251
232
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252 Connection connection = null;
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253 PreparedStatement fetchIds = null;
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254 PreparedStatement stmnt = null;
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255 ResultSet result = null;
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256
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257 DataSource dataSource = dbConnection.getDataSource();
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258
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259 Set<Integer> lockedIds = lockedIdsProvider != null
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260 ? lockedIdsProvider.getLockedIds()
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261 : EMPTY_IDS;
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262
238
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263 String questionMarks = lockedIds.isEmpty()
241
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264 ? "-666" // XXX: A bit hackish.
238
61b7041204a7 Fix for flys/issue8 (part 2)
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265 : StringUtils.repeat('?', lockedIds.size(), ',');
231
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266
314
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267 List<String> deletedCollections = new ArrayList<String>();
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268 List<String> deletedArtifacts = new ArrayList<String>();
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269
30
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270 try {
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271 connection = dataSource.getConnection();
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272 connection.setAutoCommit(false);
231
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273
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274 fetchIds = connection.prepareStatement(
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275 SQL_OUTDATED.replace("$LOCKED_IDS$", questionMarks));
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276
30
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277 // some dbms like derby do not support LIMIT
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278 // in SQL statements.
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279 fetchIds.setMaxRows(MAX_ROWS);
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280
232
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281 // Fetch ids of outdated collections
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282 stmnt = connection.prepareStatement(
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283 SQL_OUTDATED_COLLECTIONS.replace(
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284 "$LOCKED_IDS$", questionMarks));
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285
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286 // fill in the locked ids
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287 int idx = 1;
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288 for (Integer id: lockedIds) {
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289 fetchIds.setInt(idx, id);
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290 stmnt .setInt(idx, id);
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291 ++idx;
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292 }
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293
314
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294 ArrayList<IdIdentifier> cs = new ArrayList<IdIdentifier>();
232
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295 result = stmnt.executeQuery();
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296 while (result.next()) {
314
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297 cs.add(new IdIdentifier(
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298 result.getInt(1),
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299 result.getString(2)));
232
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300 }
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301
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302 result.close(); result = null;
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303 stmnt.close(); stmnt = null;
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304
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305 // delete collection items
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306 stmnt = connection.prepareStatement(SQL_DELETE_COLLECTION_ITEMS);
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307
314
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308 for (IdIdentifier id: cs) {
393
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309 logger.debug("Mark collection for deletion: " + id.id);
314
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310 stmnt.setInt(1, id.id);
232
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311 stmnt.execute();
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312 }
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313
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314 stmnt.close(); stmnt = null;
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315
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316 // delete collections
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317 stmnt = connection.prepareStatement(SQL_DELETE_COLLECTION);
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318
314
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319 for (IdIdentifier id: cs) {
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320 stmnt.setInt(1, id.id);
232
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321 stmnt.execute();
314
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322 deletedCollections.add(id.identifier);
232
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323 }
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324
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325 stmnt.close(); stmnt = null;
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326 connection.commit();
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327
314
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328 cs = null;
232
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329
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330 // remove artifacts
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331 stmnt = connection.prepareStatement(SQL_DELETE_ARTIFACT);
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332
30
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333 for (;;) {
230
fbd57d2eeaef Changed semantics of locked artifact ids.
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334 List<IdData> ids = new ArrayList<IdData>();
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335
30
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336 result = fetchIds.executeQuery();
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337
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338 while (result.next()) {
231
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339 ids.add(new IdData(
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340 result.getInt(1),
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341 result.getString(2),
314
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342 result.getBytes(3),
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343 result.getString(4)));
30
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344 }
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345
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346 result.close(); result = null;
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347
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348 if (ids.isEmpty()) {
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349 break;
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350 }
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351
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352 for (int i = ids.size()-1; i >= 0; --i) {
230
fbd57d2eeaef Changed semantics of locked artifact ids.
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diff changeset
353 IdData idData = ids.get(i);
41
5e4bc24ea438 Made serilization more flexible. DB update required!!!
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parents: 32
diff changeset
354 Artifact artifact = reviver.reviveArtifact(
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diff changeset
355 idData.factoryName, idData.data);
30
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356 idData.data = null;
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357
393
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diff changeset
358 logger.debug("Prepare Artifact (id="
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359 + idData.id + ") for deletion.");
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360
232
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361 stmnt.setInt(1, idData.id);
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362 stmnt.execute();
30
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363 connection.commit();
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364
88972c6daa4f Added a cleanup thread which periodically removes
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diff changeset
365 try {
88972c6daa4f Added a cleanup thread which periodically removes
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366 if (artifact != null) {
393
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parents: 315
diff changeset
367 logger.debug("Call endOfLife for Artifact: "
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diff changeset
368 + artifact.identifier());
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diff changeset
369
30
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370 artifact.endOfLife(context);
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371 }
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372 }
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373 catch (Exception e) {
393
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374 logger.error(e.getMessage(), e);
30
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375 }
314
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376
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diff changeset
377 deletedArtifacts.add(idData.identifier);
30
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378 } // for all fetched data
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379 }
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380 }
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381 catch (SQLException sqle) {
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382 logger.error(sqle.getLocalizedMessage(), sqle);
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383 }
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diff changeset
384 finally {
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385 if (result != null) {
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386 try { result.close(); }
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diff changeset
387 catch (SQLException sqle) {}
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388 }
232
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diff changeset
389 if (stmnt != null) {
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diff changeset
390 try { stmnt.close(); }
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391 catch (SQLException sqle) {}
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392 }
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393 if (fetchIds != null) {
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394 try { fetchIds.close(); }
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395 catch (SQLException sqle) {}
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396 }
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397 if (connection != null) {
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398 try { connection.close(); }
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399 catch (SQLException sqle) {}
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400 }
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401 }
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402
315
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403 if (!deletedCollections.isEmpty()) {
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404 reviver.killedCollections(deletedCollections);
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405 }
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406
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407 if (!deletedArtifacts.isEmpty()) {
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408 reviver.killedArtifacts(deletedArtifacts);
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409 }
314
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410
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411 if (logger.isDebugEnabled()) {
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412 logger.debug(
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413 "collections removed: " + deletedCollections.size());
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414 logger.debug(
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415 "artifacts removed: " + deletedArtifacts.size());
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416 }
30
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417 }
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418
90
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419 /**
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420 * The main code of the cleaner. It sleeps for the configured
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421 * nap time, cleans up the database, sleeps again and so on.
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422 */
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423 @Override
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424 public void run() {
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425 logger.info("sleep time: " + sleepTime + "ms");
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426 for (;;) {
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427 cleanup();
48
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428 long startTime = System.currentTimeMillis();
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429
30
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430 try {
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431 synchronized (sleepLock) {
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432 sleepLock.wait(sleepTime);
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433 }
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434 }
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435 catch (InterruptedException ie) {
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436 }
48
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437
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438 long stopTime = System.currentTimeMillis();
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439
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440 if (logger.isDebugEnabled()) {
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441 logger.debug("Cleaner slept " + (stopTime - startTime) + "ms");
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442 }
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443 } // for (;;)
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444 }
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445 }
90
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446 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org