src/main/java/de/uapcore/lightpit/DatabaseFacade.java

Sat, 16 May 2020 15:11:07 +0200

author
Mike Becker <universe@uap-core.de>
date
Sat, 16 May 2020 15:11:07 +0200
changeset 52
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parent 50
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permissions
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adds project selection

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2018 Mike Becker. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 *
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28 */
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29 package de.uapcore.lightpit;
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30
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31 import org.slf4j.Logger;
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32 import org.slf4j.LoggerFactory;
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33
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34 import javax.naming.Context;
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35 import javax.naming.InitialContext;
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36 import javax.naming.NamingException;
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37 import javax.servlet.ServletContext;
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38 import javax.servlet.ServletContextEvent;
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39 import javax.servlet.ServletContextListener;
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40 import javax.servlet.annotation.WebListener;
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41 import javax.sql.DataSource;
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42 import java.sql.Connection;
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43 import java.sql.DatabaseMetaData;
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44 import java.sql.SQLException;
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45 import java.util.Optional;
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46
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47 /**
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48 * Provides access to different privilege layers within the database.
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49 */
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50 @WebListener
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51 public final class DatabaseFacade implements ServletContextListener {
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52
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53 private static final Logger LOG = LoggerFactory.getLogger(DatabaseFacade.class);
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54
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55 /**
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56 * Timeout in seconds for the validation test.
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57 */
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58 private static final int DB_TEST_TIMEOUT = 10;
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59
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60 /**
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61 * Specifies the database dialect.
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62 */
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63 public enum Dialect {
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64 Postgres
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65 }
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66
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67 /**
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68 * The database dialect to use.
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69 * <p>
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70 * May be overridden by context parameter.
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71 *
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72 * @see Constants#CTX_ATTR_DB_DIALECT
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73 */
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74 private Dialect dialect = Dialect.Postgres;
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75
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76 /**
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77 * The default schema to test against when validating the connection.
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78 * <p>
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79 * May be overridden by context parameter.
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80 *
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81 * @see Constants#CTX_ATTR_DB_SCHEMA
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82 */
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83 private static final String DB_DEFAULT_SCHEMA = "lightpit";
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84
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85 /**
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86 * The attribute name in the Servlet context under which an instance of this class can be found.
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87 */
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88 public static final String SC_ATTR_NAME = DatabaseFacade.class.getName();
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89
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90 private static final String DS_JNDI_NAME = "jdbc/lightpit/app";
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91 private DataSource dataSource;
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92
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93 /**
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94 * Returns the data source.
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95 *
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96 * @return a data source
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97 */
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98 public DataSource getDataSource() {
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99 return dataSource;
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100 }
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101
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102 public Dialect getSQLDialect() {
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103 return dialect;
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104 }
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105
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106 private static void checkConnection(DataSource ds, String testSchema) {
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107 try (Connection conn = ds.getConnection()) {
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108 if (!conn.isValid(DB_TEST_TIMEOUT)) {
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109 throw new SQLException("Validation check failed.");
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110 }
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111 if (conn.isReadOnly()) {
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112 throw new SQLException("Connection is read-only and thus unusable.");
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113 }
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114 if (!conn.getSchema().equals(testSchema)) {
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115 throw new SQLException(String.format("Connection is not configured to use the schema %s.", testSchema));
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116 }
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117 DatabaseMetaData metaData = conn.getMetaData();
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118 LOG.info("Connections as {} to {}/{} ready to go.", metaData.getUserName(), metaData.getURL(), conn.getSchema());
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119 } catch (SQLException ex) {
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120 LOG.error("Checking database connection failed", ex);
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121 }
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122 }
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123
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124 private static DataSource retrieveDataSource(Context ctx) {
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125 DataSource ret = null;
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126 try {
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127 ret = (DataSource) ctx.lookup(DS_JNDI_NAME);
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128 LOG.info("Data source retrieved.");
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129 } catch (NamingException ex) {
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130 LOG.error("Data source {} not available.", DS_JNDI_NAME);
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131 LOG.error("Reason for the missing data source: ", ex);
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132 }
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133 return ret;
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134 }
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135
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136 @Override
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137 public void contextInitialized(ServletContextEvent sce) {
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138 ServletContext sc = sce.getServletContext();
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139
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140 dataSource = null;
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141
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142 final String dbSchema = Optional
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143 .ofNullable(sc.getInitParameter(Constants.CTX_ATTR_DB_SCHEMA))
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144 .orElse(DB_DEFAULT_SCHEMA);
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145 final String dbDialect = sc.getInitParameter(Constants.CTX_ATTR_DB_DIALECT);
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146 if (dbDialect != null) {
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147 try {
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148 dialect = Dialect.valueOf(dbDialect);
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149 } catch (IllegalArgumentException ex) {
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150 LOG.error("Unknown or unsupported database dialect {}. Defaulting to {}.", dbDialect, dialect);
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151 }
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152 }
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153
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154 try {
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155 LOG.debug("Trying to access JNDI context ...");
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156 Context initialCtx = new InitialContext();
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157 Context ctx = (Context) initialCtx.lookup("java:comp/env");
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158
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159 dataSource = retrieveDataSource(ctx);
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160
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161 if (dataSource != null) {
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162 checkConnection(dataSource, dbSchema);
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163 }
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164 } catch (NamingException | ClassCastException ex) {
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165 LOG.error("Cannot access JNDI resources.", ex);
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166 }
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167
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168 sc.setAttribute(SC_ATTR_NAME, this);
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169 LOG.info("Database facade injected into ServletContext.");
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170 }
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171
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172 @Override
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173 public void contextDestroyed(ServletContextEvent sce) {
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174 dataSource = null;
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175 }
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176 }

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