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

Sat, 07 Apr 2018 23:01:58 +0200

author
Mike Becker <universe@uap-core.de>
date
Sat, 07 Apr 2018 23:01:58 +0200
changeset 23
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parent 20
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child 24
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global table style

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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 2017 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 java.sql.Connection;
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32 import java.sql.DatabaseMetaData;
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33 import java.sql.SQLException;
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34 import java.util.Optional;
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35 import javax.naming.Context;
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36 import javax.naming.InitialContext;
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37 import javax.naming.NamingException;
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38 import javax.servlet.ServletContext;
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39 import javax.servlet.ServletContextEvent;
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40 import javax.servlet.ServletContextListener;
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41 import javax.servlet.annotation.WebListener;
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42 import javax.sql.DataSource;
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43 import org.slf4j.Logger;
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44 import org.slf4j.LoggerFactory;
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45
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46 /**
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47 * Provides access to different privilege layers within the database.
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48 */
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49 @WebListener
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50 public final class DatabaseFacade implements ServletContextListener {
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51
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52 private static final Logger LOG = LoggerFactory.getLogger(DatabaseFacade.class);
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53
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54 /**
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55 * Timeout in seconds for the validation test.
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56 */
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57 private static final int DB_TEST_TIMEOUT = 10;
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58
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59 public static enum Dialect {
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60 Postgres;
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61 }
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62
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63 /**
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64 * The database dialect to use.
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65 *
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66 * May be override by context parameter.
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67 *
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68 * @see Constants#CTX_ATTR_DB_DIALECT
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69 */
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70 private Dialect dialect = Dialect.Postgres;
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71
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72 /**
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73 * The default schema to test against when validating the connection.
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74 *
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75 * May be overridden by context parameter.
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76 *
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77 * @see Constants#CTX_ATTR_DB_SCHEMA
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78 */
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79 private static final String DB_DEFAULT_SCHEMA = "lightpit";
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80
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81 /**
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82 * The attribute name in the Servlet context under which an instance of this class can be found.
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83 */
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84 public static final String SC_ATTR_NAME = DatabaseFacade.class.getName();
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85 private ServletContext sc;
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86
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87 private static final String DS_JNDI_NAME = "jdbc/lightpit/app";
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88 private Optional<DataSource> dataSource;
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89
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90 /**
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91 * Returns the data source.
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92 *
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93 * The Optional returned should never be empty. However, if something goes
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94 * wrong during initialization, the data source might be absent.
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95 * Hence, users of this data source are forced to check the existence.
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96 *
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97 * @return a data source
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98 */
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99 public Optional<DataSource> getDataSource() {
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100 return dataSource;
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101 }
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102
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103 public Dialect getSQLDialect() {
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104 return dialect;
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105 }
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106
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107 private static void checkConnection(DataSource ds, String testSchema, String errMsg) {
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108 try (Connection conn = ds.getConnection()) {
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109 if (!conn.isValid(DB_TEST_TIMEOUT)) {
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110 throw new SQLException("Validation check failed.");
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111 }
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112 if (conn.isReadOnly()) {
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113 throw new SQLException("Connection is read-only and thus unusable.");
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114 }
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115 if (!conn.getSchema().equals(testSchema)) {
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116 throw new SQLException(String.format("Connection is not configured to use the schema %s.", testSchema));
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117 }
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118 DatabaseMetaData metaData = conn.getMetaData();
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119 LOG.info("Connections as {} to {}/{} ready to go.", metaData.getUserName(), metaData.getURL(), conn.getSchema());
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120 } catch (SQLException ex) {
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121 LOG.error(errMsg, ex);
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122 }
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123 }
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124
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125 private static Optional<DataSource> retrieveDataSource(Context ctx) {
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126 DataSource ret = null;
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127 try {
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128 ret = (DataSource)ctx.lookup(DS_JNDI_NAME);
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129 LOG.info("Data source retrieved.");
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130 } catch (NamingException ex) {
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131 LOG.error("Data source {} not available.", DS_JNDI_NAME);
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132 LOG.error("Reason for the missing data source: ", ex);
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133 }
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134 return Optional.ofNullable(ret);
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135 }
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136
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137 @Override
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138 public void contextInitialized(ServletContextEvent sce) {
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139 sc = sce.getServletContext();
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140
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141 dataSource = null;
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142
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143 final String contextName = Optional
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144 .ofNullable(sc.getInitParameter(Constants.CTX_ATTR_JNDI_CONTEXT))
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145 .orElse("java:comp/env");
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146 final String dbSchema = Optional
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147 .ofNullable(sc.getInitParameter(Constants.CTX_ATTR_DB_SCHEMA))
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148 .orElse(DB_DEFAULT_SCHEMA);
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149 final String dbDialect = sc.getInitParameter(Constants.CTX_ATTR_DB_DIALECT);
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150 if (dbDialect != null) {
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151 try {
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152 dialect = Dialect.valueOf(dbDialect);
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153 } catch (IllegalArgumentException ex) {
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154 LOG.error("Unknown or unsupported database dialect {}. Defaulting to {}.", dbDialect, dialect);
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155 }
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156 }
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158 try {
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159 LOG.debug("Trying to access JNDI context {}...", contextName);
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160 Context initialCtx = new InitialContext();
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161 Context ctx = (Context) initialCtx.lookup(contextName);
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162
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163 dataSource = retrieveDataSource(ctx);
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164
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165 dataSource.ifPresent((ds) -> checkConnection(ds, dbSchema, "Checking database connection failed"));
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166 } catch (NamingException | ClassCastException ex) {
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167 LOG.error("Cannot access JNDI resources.", ex);
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168 }
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169
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170 sc.setAttribute(SC_ATTR_NAME, this);
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171 LOG.info("Database facade injected into ServletContext.");
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172 }
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173
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174 @Override
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175 public void contextDestroyed(ServletContextEvent sce) {
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176 dataSource = null;
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177 }
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178 }

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