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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DBConnection.java @ 111:901f384ddad9

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Added an interface and its default implementation for a User. artifacts/trunk@1307 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 10 Feb 2011 07:36:51 +0000
parents 933bbc9fc11f
children b2115f484edb
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 java.io.File;
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12
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13 import java.sql.SQLException;
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15 import javax.sql.DataSource;
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17 import org.apache.commons.dbcp.BasicDataSource;
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18
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19 import org.apache.log4j.Logger;
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20
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21 /**
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22 * This class encapsulate the creation and pooling of database connections used
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23 * by the artifact database. The credential to open the database connections
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24 * are taken from the global configuratiion.
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25 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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26 */
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27 public class DBConnection
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28 {
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29 private static Logger logger = Logger.getLogger(DBConnection.class);
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31 /**
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32 * XPath to access the database driver within the global configuration.
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33 */
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34 public static final String DB_DRIVER =
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35 "/artifact-database/database/driver/text()";
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36 /**
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37 * XPath to access the database URL within the global configuration.
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38 */
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39 public static final String DB_URL =
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40 "/artifact-database/database/url/text()";
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41 /**
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42 * XPath to access the database use within the global configuration.
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43 */
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44 public static final String DB_USER =
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45 "/artifact-database/database/user/text()";
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46 /**
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47 * XPath to access the database password within the global configuration.
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48 */
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49 public static final String DB_PASSWORD =
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50 "/artifact-database/database/password/text()";
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51
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52 /**
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53 * The default database driver: H2
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54 */
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55 public static final String DEFAULT_DRIVER =
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56 "org.h2.Driver";
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57
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58 /**
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59 * The default database name: artifacts.db
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60 */
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61 public static final String DEFAULT_DATABASE_FILE =
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62 "artifacts.db";
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63
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64 /**
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65 * The default database URL: This is created once by #getDefaultURL()
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66 */
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67 public static final String DEFAULT_URL = getDefaultURL();
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68
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69 /**
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70 * The default database user: ""
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71 */
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72 public static final String DEFAULT_USER = "";
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74 /**
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75 * The default database password: ""
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76 */
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77 public static final String DEFAULT_PASSWORD = "";
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78
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79 private DBConnection() {
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80 }
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82 /**
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83 * Constructs the default databse URL. It concats the
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84 * config directory and the #DEFAULT_DATABASE_FILE
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85 * to the string with is needed to access H2 databases.
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86 * @return The default URL.
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87 */
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88 public static final String getDefaultURL() {
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89 File configDir = Config.getConfigDirectory();
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90 File databaseFile = new File(configDir, DEFAULT_DATABASE_FILE);
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91 return "jdbc:h2:" + databaseFile;
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92 }
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94 private static BasicDataSource dataSource;
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95
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96 private static final void addShutdownHook() {
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97 Runtime.getRuntime().addShutdownHook(new Thread() {
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98 @Override
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99 public void run() {
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100 if (dataSource != null) {
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101 try {
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102 dataSource.close();
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103 }
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104 catch (SQLException sqle) {
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105 }
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106 dataSource = null;
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107 }
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108 }
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109 });
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110 }
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111
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112 /**
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113 * Static method to fetch a database connection.
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114 * @return a DataSource to access the database connection.
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115 */
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116 public static synchronized DataSource getDataSource() {
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117 if (dataSource == null) {
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118 dataSource = new BasicDataSource();
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119
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120 String driver = Config.getStringXPath(
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121 DB_DRIVER, DEFAULT_DRIVER);
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122
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123 String url = Config.getStringXPath(
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124 DB_URL, DEFAULT_URL);
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125
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126 url = Config.replaceConfigDir(url);
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127
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128 String user = Config.getStringXPath(
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129 DB_USER, DEFAULT_USER);
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130
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131 String password = Config.getStringXPath(
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132 DB_PASSWORD, DEFAULT_PASSWORD);
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133
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134 logger.info("database driver: " + driver);
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135 logger.info("database url: " + url);
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136
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137 dataSource.setDriverClassName(driver);
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138 dataSource.setUsername(user);
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139 dataSource.setPassword(password);
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140 dataSource.setUrl(url);
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141 addShutdownHook();
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142 }
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143
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144 return dataSource;
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145 }
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146 }
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147 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org