Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DatabaseCleaner.java @ 207:b2115f484edb

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Move Config and XMLUtils totally to commons package. artifacts/trunk@1476 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 15 Mar 2011 15:49:24 +0000
parents 933bbc9fc11f
children fbd57d2eeaef
rev   line source
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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
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23 import javax.sql.DataSource;
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24
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25 import org.apache.log4j.Logger;
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26
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27 /**
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28 * The database cleaner runs in background. It sleep for a configurable
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29 * while and when it wakes up it removes outdated artifacts from the
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30 * database. Outdated means that the the last access to the artifact
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31 * is longer aga then the time to live of this artifact.<br>
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32 * Before the artifact is finally removed from the system it is
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33 * revived one last time an the #endOfLife() method of the artifact
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34 * is called.<br>
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35 * The artifact implementations may e.g. use this to remove some extrenal
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36 * resources form the system.
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37 *
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38 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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39 */
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40 public class DatabaseCleaner
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41 extends Thread
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42 {
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43 /**
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44 * Implementors of this interface are able to create a
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45 * living artifact from a given byte array.
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46 */
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47 public interface ArtifactReviver {
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48
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49 /**
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50 * Called to revive an artifact from a given byte array.
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51 * @param factoryName The name of the factory which
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52 * created this artifact.
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53 * @param bytes The bytes of the serialized artifact.
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54 * @return The revived artfiact.
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55 */
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56 Artifact reviveArtifact(String factoryName, byte [] bytes);
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57
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58 } // interface ArtifactReviver
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59
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60 private static Logger logger = Logger.getLogger(DatabaseCleaner.class);
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62 /**
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63 * Number of artifacts to be loaded at once. Used to
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64 * mitigate the problem of a massive denial of service
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65 * if too many artifacts have died since last cleanup.
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66 */
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67 public static final int MAX_ROWS = 50;
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68
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69 /**
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70 * The SQL statement to select the outdated artifacts.
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71 */
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72 public static final String SQL_OUTDATED =
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73 SQL.get("artifacts.outdated");
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75 /**
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76 * The SQL statement to delete some artifacts from the database.
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77 */
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78 public static final String SQL_DELETE =
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79 SQL.get("artifacts.delete");
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81 /**
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82 * XPath to figure out how long the cleaner should sleep between
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83 * cleanups. This is stored in the global configuration.
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84 */
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85 public static final String SLEEP_XPATH =
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86 "/artifact-database/cleaner/sleep-time/text()";
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88 /**
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89 * Default nap time between cleanups: 5 minutes.
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90 */
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91 public static final long SLEEP_DEFAULT =
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92 5 * 60 * 1000L; // 5 minutes
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94 /**
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95 * The configured nap time.
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96 */
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97 protected long sleepTime;
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99 /**
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100 * Internal locking mechanism to prevent some race conditions.
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101 */
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102 protected Object sleepLock = new Object();
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104 /**
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105 * A reference to the global context.
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106 */
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107 protected Object context;
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108
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109 /**
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110 * A specialized Id filter which only delete some artifacts.
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111 * This is used to prevent deletion of living artifacts.
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112 */
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113 protected Id.Filter filter;
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115 /**
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116 * The reviver used to bring the dead artifact on last
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117 * time back to live to call endOfLife() on them.
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118 */
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119 protected ArtifactReviver reviver;
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120
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121 /**
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122 * Default constructor.
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123 */
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124 public DatabaseCleaner() {
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125 }
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127 /**
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128 * Constructor to create a cleaner with a given global context
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129 * and a given reviver.
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130 * @param context The global context of the artifact database
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131 * @param reviver The reviver to awake artifact one last time.
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132 */
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133 public DatabaseCleaner(Object context, ArtifactReviver reviver) {
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134 setDaemon(true);
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135 sleepTime = getSleepTime();
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136 this.context = context;
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diff changeset
137 this.reviver = reviver;
30
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138 }
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139
90
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140 /**
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141 * Sets the filter that prevents deletion of living artifacts.
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142 * Living artifacts are artifacts which are currently active
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143 * inside the artifact database. Deleting them in this state
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144 * would create severe internal problems.
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145 * @param filter
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146 */
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147 public void setFilter(Id.Filter filter) {
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148 this.filter = filter;
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149 }
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150
90
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151 /**
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152 * External hook to tell the cleaner to wake up before its
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153 * regular nap time is over. This is the case when the artifact
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154 * database finds an artifact which is already outdated.
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155 */
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156 public void wakeup() {
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157 synchronized (sleepLock) {
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158 sleepLock.notify();
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159 }
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160 }
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161
90
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162 /**
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163 * Fetches the sleep time from the global configuration.
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164 * @return the time to sleep between database cleanups in ms.
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165 */
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166 protected static long getSleepTime() {
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167 String sleepTimeString = Config.getStringXPath(SLEEP_XPATH);
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168
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169 if (sleepTimeString == null) {
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170 return SLEEP_DEFAULT;
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171 }
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172 try {
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173 // sleep at least one second
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174 return Math.max(Long.parseLong(sleepTimeString), 1000L);
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175 }
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176 catch (NumberFormatException nfe) {
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177 logger.warn("Cleaner sleep time defaults to " + SLEEP_DEFAULT);
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178 }
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179 return SLEEP_DEFAULT;
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180 }
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181
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182 private static final class IdData
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183 extends Id
32
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184 {
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185 byte [] data;
41
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186 String factoryName;
30
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187
41
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188 public IdData(int id, String factoryName, byte [] data) {
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189 super(id);
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190 this.factoryName = factoryName;
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191 this.data = data;
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192 }
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193 } // class IdData
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194
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195 /**
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196 * Cleaning is done in two phases. First we fetch a list of ids
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197 * of artifacts. If there are artifacts the cleaning is done.
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198 * Second we load the artifacts one by one one and call there
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199 * endOfLife() method. In this loop we remove them from database, too.
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200 * Each deletion is commited to ensure that a sudden failure
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201 * of the artifact database server does delete artifacts twice
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202 * or does not delete them at all. After this the first step
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203 * is repeated.
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204 */
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205 protected void cleanup() {
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206 logger.info("database cleanup");
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207
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208 Connection connection = null;
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209 PreparedStatement fetchIds = null;
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210 PreparedStatement deleteId = null;
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211 ResultSet result = null;
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212
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213 int removedArtifacts = 0;
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214
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215 DataSource dataSource = DBConnection.getDataSource();
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216 try {
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217 connection = dataSource.getConnection();
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218 connection.setAutoCommit(false);
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219 fetchIds = connection.prepareStatement(SQL_OUTDATED);
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220 deleteId = connection.prepareStatement(SQL_DELETE);
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221
88972c6daa4f Added a cleanup thread which periodically removes
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222 // some dbms like derby do not support LIMIT
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223 // in SQL statements.
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224 fetchIds.setMaxRows(MAX_ROWS);
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225
88972c6daa4f Added a cleanup thread which periodically removes
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226 for (;;) {
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diff changeset
227 List ids = new ArrayList();
30
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228
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229 result = fetchIds.executeQuery();
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230
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231 while (result.next()) {
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232 ids.add(new IdData(
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diff changeset
233 result.getInt(1),
41
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diff changeset
234 result.getString(2),
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diff changeset
235 result.getBytes(3)));
30
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236 }
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237
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238 result.close(); result = null;
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239
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240 if (ids.isEmpty()) {
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241 break;
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242 }
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243
32
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diff changeset
244 if (filter != null) {
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245 ids = filter.filterIds(ids);
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diff changeset
246 }
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diff changeset
247
30
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248 for (int i = ids.size()-1; i >= 0; --i) {
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249 IdData idData = (IdData)ids.get(i);
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diff changeset
250 Artifact artifact = reviver.reviveArtifact(
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diff changeset
251 idData.factoryName, idData.data);
30
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252 idData.data = null;
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253
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254 deleteId.setInt(1, idData.id);
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255 deleteId.execute();
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256 connection.commit();
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257
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258 try {
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259 if (artifact != null) {
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260 artifact.endOfLife(context);
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261 }
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262 }
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263 catch (Exception e) {
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264 logger.error(e.getLocalizedMessage(), e);
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265 }
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266 } // for all fetched data
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267
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268 removedArtifacts += ids.size();
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269 }
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270 }
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271 catch (SQLException sqle) {
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272 logger.error(sqle.getLocalizedMessage(), sqle);
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273 }
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274 finally {
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275 if (result != null) {
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276 try { result.close(); }
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277 catch (SQLException sqle) {}
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278 }
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279 if (fetchIds != null) {
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280 try { fetchIds.close(); }
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281 catch (SQLException sqle) {}
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282 }
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283 if (deleteId != null) {
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284 try { deleteId.close(); }
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285 catch (SQLException sqle) {}
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286 }
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287 if (connection != null) {
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288 try { connection.close(); }
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289 catch (SQLException sqle) {}
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290 }
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291 }
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292
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293 logger.info("artifacts removed: " + removedArtifacts);
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294 }
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295
90
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296 /**
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297 * The main code of the cleaner. It sleeps for the configured
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298 * nap time, cleans up the database, sleeps again and so on.
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299 */
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300 @Override
30
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301 public void run() {
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302 logger.info("sleep time: " + sleepTime + "ms");
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303 for (;;) {
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304 cleanup();
48
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305 long startTime = System.currentTimeMillis();
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306
30
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307 try {
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308 synchronized (sleepLock) {
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309 sleepLock.wait(sleepTime);
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310 }
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311 }
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312 catch (InterruptedException ie) {
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313 }
48
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314
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315 long stopTime = System.currentTimeMillis();
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316
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317 if (logger.isDebugEnabled()) {
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318 logger.debug("Cleaner slept " + (stopTime - startTime) + "ms");
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319 }
30
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320 } // for (;;)
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321 }
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322 }
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323 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org