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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DatabaseCleaner.java @ 33:251e8904d6c2

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Make the Interfaces Serializable to make them usable in the Artifactdatabase. Bug Fixed in SQL-Statement artifacts/trunk@81 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Mon, 14 Sep 2009 13:36:35 +0000
parents c2d53bd30ab8
children 5e4bc24ea438
rev   line source
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1 package de.intevation.artifactdatabase;
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2
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3 import de.intevation.artifacts.Artifact;
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4
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5 import java.sql.Connection;
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6 import java.sql.SQLException;
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7 import java.sql.PreparedStatement;
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8 import java.sql.ResultSet;
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9
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10 import javax.sql.DataSource;
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11
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12 import org.apache.log4j.Logger;
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13
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14 import java.util.ArrayList;
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15 import java.util.List;
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16
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17 /**
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18 * @author Sascha L. Teichmann
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19 */
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20 public class DatabaseCleaner
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21 extends Thread
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22 {
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23 private static Logger logger = Logger.getLogger(DatabaseCleaner.class);
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24
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25 public static final int MAX_ROWS = 50;
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26
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27 public static final String SQL_OUTDATED =
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28 SQL.get("artifacts.outdated");
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29
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30 public static final String SQL_DELETE =
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31 SQL.get("artifacts.delete");
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32
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33 public static final String SLEEP_XPATH =
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34 "/artifact-database/cleaner/sleep-time/text()";
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35
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36 public static final long SLEEP_DEFAULT =
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37 5 * 60 * 1000L; // 5 minutes
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38
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39 protected long sleepTime;
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40
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41 protected Object sleepLock = new Object();
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42
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43 protected Object context;
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44
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45 protected Id.Filter filter;
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46
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47 public DatabaseCleaner() {
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48 }
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49
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50 public DatabaseCleaner(Object context) {
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51 setDaemon(true);
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52 sleepTime = getSleepTime();
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53 this.context = context;
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54 }
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55
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56 public void setFilter(Id.Filter filter) {
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57 this.filter = filter;
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58 }
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59
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60 public void wakeup() {
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61 synchronized (sleepLock) {
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62 sleepLock.notify();
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63 }
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64 }
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65
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66 protected static long getSleepTime() {
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67 String sleepTimeString = Config.getStringXPath(SLEEP_XPATH);
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68
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69 if (sleepTimeString == null) {
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70 return SLEEP_DEFAULT;
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71 }
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72 try {
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73 // sleep at least one second
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74 return Math.max(Long.parseLong(sleepTimeString), 1000L);
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75 }
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76 catch (NumberFormatException nfe) {
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77 logger.warn("Cleaner sleep time defaults to " + SLEEP_DEFAULT);
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78 }
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79 return SLEEP_DEFAULT;
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80 }
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81
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82 private static final class IdData
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83 extends Id
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84 {
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85 byte [] data;
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86
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87 public IdData(int id, byte [] data) {
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88 super(id);
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89 this.data = data;
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90 }
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91 } // class IdData
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92
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93 /**
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94 * Cleaning is done in two phases. First we fetch a list of ids
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95 * of artifacts. If there are artifacts the cleaning is done.
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96 * Second we load the artifacts one by one one and call there
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97 * endOfLife() method. In this loop we remove them from database, too.
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98 * Each deletion is commited to ensure that a sudden failure
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99 * of the artifact database server does delete artifacts twice
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100 * or does not delete them at all. After this the first step
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101 * is repeated.
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102 */
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103 protected void cleanup() {
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104 logger.info("database cleanup");
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105
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106 Connection connection = null;
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107 PreparedStatement fetchIds = null;
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108 PreparedStatement deleteId = null;
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109 ResultSet result = null;
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110
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111 int removedArtifacts = 0;
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112
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113 DataSource dataSource = DBConnection.getDataSource();
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114 try {
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115 connection = dataSource.getConnection();
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116 connection.setAutoCommit(false);
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117 fetchIds = connection.prepareStatement(SQL_OUTDATED);
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118 deleteId = connection.prepareStatement(SQL_DELETE);
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119
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120 // some dbms like derby do not support LIMIT
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121 // in SQL statements.
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122 fetchIds.setMaxRows(MAX_ROWS);
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123
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124 for (;;) {
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125 List ids = new ArrayList();
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126
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127 result = fetchIds.executeQuery();
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128
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129 while (result.next()) {
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130 ids.add(new IdData(
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131 result.getInt(1), result.getBytes(2)));
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132 }
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133
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134 result.close(); result = null;
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135
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136 if (ids.isEmpty()) {
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137 break;
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138 }
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139
32
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140 if (filter != null) {
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141 ids = filter.filterIds(ids);
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142 }
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143
30
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144 for (int i = ids.size()-1; i >= 0; --i) {
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145 IdData idData = (IdData)ids.get(i);
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146 Artifact artifact = Backend.restoreArtifact(
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147 idData.data);
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148 idData.data = null;
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149
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150 deleteId.setInt(1, idData.id);
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151 deleteId.execute();
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152 connection.commit();
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153
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154 try {
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155 if (artifact != null) {
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156 artifact.endOfLife(context);
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157 }
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158 }
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159 catch (Exception e) {
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160 logger.error(e.getLocalizedMessage(), e);
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161 }
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162 } // for all fetched data
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163
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164 removedArtifacts += ids.size();
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165 }
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166 }
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167 catch (SQLException sqle) {
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168 logger.error(sqle.getLocalizedMessage(), sqle);
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169 }
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170 finally {
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171 if (result != null) {
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172 try { result.close(); }
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173 catch (SQLException sqle) {}
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174 }
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175 if (fetchIds != null) {
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176 try { fetchIds.close(); }
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177 catch (SQLException sqle) {}
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178 }
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179 if (deleteId != null) {
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180 try { deleteId.close(); }
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181 catch (SQLException sqle) {}
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182 }
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183 if (connection != null) {
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184 try { connection.close(); }
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185 catch (SQLException sqle) {}
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186 }
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187 }
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188
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189 logger.info("artifacts removed: " + removedArtifacts);
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190 }
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191
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192 public void run() {
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193 logger.info("sleep time: " + sleepTime + "ms");
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194 for (;;) {
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195 cleanup();
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196 try {
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197 synchronized (sleepLock) {
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198 sleepLock.wait(sleepTime);
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199 }
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200 }
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201 catch (InterruptedException ie) {
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202 }
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203 } // for (;;)
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204 }
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205 }
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206 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org