annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DBConnection.java @ 91:730ff077a58c

More javadoc, some code formatting. artifacts/trunk@847 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 28 Mar 2010 10:01:03 +0000
parents d348fe1fd822
children e27cf9c84eb8
rev   line source
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1 package de.intevation.artifactdatabase;
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3 import javax.sql.DataSource;
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5 import java.sql.SQLException;
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7 import org.apache.commons.dbcp.BasicDataSource;
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8
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9 import java.io.File;
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10
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11 import org.apache.log4j.Logger;
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13 /**
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14 * This class encapsulate the creation and pooling of database connections used
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15 * by the artifact database. The credential to open the database connections
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16 * are taken from the global configuratiion.
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17 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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18 */
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19 public class DBConnection
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20 {
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21 private static Logger logger = Logger.getLogger(DBConnection.class);
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23 /**
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24 * XPath to access the database driver within the global configuration.
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25 */
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26 public static final String DB_DRIVER =
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27 "/artifact-database/database/driver/text()";
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28 /**
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29 * XPath to access the database URL within the global configuration.
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30 */
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31 public static final String DB_URL =
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32 "/artifact-database/database/url/text()";
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33 /**
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34 * XPath to access the database use within the global configuration.
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35 */
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36 public static final String DB_USER =
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37 "/artifact-database/database/user/text()";
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38 /**
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39 * XPath to access the database password within the global configuration.
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40 */
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41 public static final String DB_PASSWORD =
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42 "/artifact-database/database/password/text()";
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43
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44 /**
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45 * The default database driver: H2
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46 */
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47 public static final String DEFAULT_DRIVER =
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48 "org.h2.Driver";
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49
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50 /**
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51 * The default database name: artifacts.db
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52 */
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53 public static final String DEFAULT_DATABASE_FILE =
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54 "artifacts.db";
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55
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56 /**
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57 * The default database URL: This is created once by #getDefaultURL()
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58 */
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59 public static final String DEFAULT_URL = getDefaultURL();
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61 /**
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62 * The default database user: ""
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63 */
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64 public static final String DEFAULT_USER = "";
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66 /**
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67 * The default database password: ""
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68 */
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69 public static final String DEFAULT_PASSWORD = "";
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71 private DBConnection() {
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72 }
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74 /**
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75 * Constructs the default databse URL. It concats the
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76 * config directory and the #DEFAULT_DATABASE_FILE
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77 * to the string with is needed to access H2 databases.
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78 * @return The default URL.
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79 */
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80 public static final String getDefaultURL() {
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81 File configDir = Config.getConfigDirectory();
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82 File databaseFile = new File(configDir, DEFAULT_DATABASE_FILE);
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83 return "jdbc:h2:" + databaseFile;
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84 }
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86 private static BasicDataSource dataSource;
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88 private static final void addShutdownHook() {
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89 Runtime.getRuntime().addShutdownHook(new Thread() {
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90 @Override
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91 public void run() {
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92 if (dataSource != null) {
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93 try {
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94 dataSource.close();
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95 }
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96 catch (SQLException sqle) {
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97 }
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98 dataSource = null;
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99 }
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100 }
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101 });
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102 }
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103
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104 /**
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105 * Static method to fetch a database connection.
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106 * @return a DataSource to access the database connection.
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107 */
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108 public static synchronized DataSource getDataSource() {
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109 if (dataSource == null) {
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110 dataSource = new BasicDataSource();
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111
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112 String driver = Config.getStringXPath(
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113 DB_DRIVER, DEFAULT_DRIVER);
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114
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115 String url = Config.getStringXPath(
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116 DB_URL, DEFAULT_URL);
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117
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118 String user = Config.getStringXPath(
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119 DB_USER, DEFAULT_USER);
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120
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121 String password = Config.getStringXPath(
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122 DB_PASSWORD, DEFAULT_PASSWORD);
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123
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124 logger.info("database driver: " + driver);
93edc04f3a10 Added postgresql support.
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125 logger.info("database url: " + url);
93edc04f3a10 Added postgresql support.
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126
10
e8626caac353 * Made Artifact life cycle symmetric: setup/endOfLife.
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127 dataSource.setDriverClassName(driver);
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128 dataSource.setUsername(user);
e8626caac353 * Made Artifact life cycle symmetric: setup/endOfLife.
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129 dataSource.setPassword(password);
e8626caac353 * Made Artifact life cycle symmetric: setup/endOfLife.
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130 dataSource.setUrl(url);
e8626caac353 * Made Artifact life cycle symmetric: setup/endOfLife.
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131 addShutdownHook();
e8626caac353 * Made Artifact life cycle symmetric: setup/endOfLife.
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132 }
e8626caac353 * Made Artifact life cycle symmetric: setup/endOfLife.
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133
e8626caac353 * Made Artifact life cycle symmetric: setup/endOfLife.
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134 return dataSource;
e8626caac353 * Made Artifact life cycle symmetric: setup/endOfLife.
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135 }
e8626caac353 * Made Artifact life cycle symmetric: setup/endOfLife.
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136 }
91
730ff077a58c More javadoc, some code formatting.
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137 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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