src/main/kotlin/de/uapcore/lightpit/DataSourceProvider.kt

Mon, 09 Aug 2021 16:57:56 +0200

author
Mike Becker <universe@uap-core.de>
date
Mon, 09 Aug 2021 16:57:56 +0200
changeset 217
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parent 184
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child 247
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permissions
-rw-r--r--

#104 changes base layout from fixed to grid

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1 /*
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2 * Copyright 2021 Mike Becker. All rights reserved.
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3 *
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4 * Redistribution and use in source and binary forms, with or without
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5 * modification, are permitted provided that the following conditions are met:
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6 *
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7 * 1. Redistributions of source code must retain the above copyright
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8 * notice, this list of conditions and the following disclaimer.
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9 *
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10 * 2. Redistributions in binary form must reproduce the above copyright
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11 * notice, this list of conditions and the following disclaimer in the
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12 * documentation and/or other materials provided with the distribution.
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13 *
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14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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15 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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17 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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20 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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21 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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24 */
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25
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26 package de.uapcore.lightpit
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27
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28 import java.sql.SQLException
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29 import javax.naming.Context
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30 import javax.naming.InitialContext
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31 import javax.naming.NamingException
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32 import javax.servlet.ServletContextEvent
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33 import javax.servlet.ServletContextListener
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34 import javax.servlet.annotation.WebListener
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35 import javax.sql.DataSource
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36
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37 /**
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38 * Provides access to the database.
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39 */
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40 @WebListener
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41 class DataSourceProvider : ServletContextListener, LoggingTrait {
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42
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43 enum class Dialect {
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44 Postgres
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45 }
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46
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47 /**
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48 * The database dialect to use.
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49 * May be overridden by context parameter.
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50 *
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51 * @see Constants.CTX_ATTR_DB_DIALECT
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52 */
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53 var dialect = Dialect.Postgres; private set
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54
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55 /**
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56 * The data source, if available.
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57 */
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58 var dataSource: DataSource? = null
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59
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60 companion object {
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61 /**
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62 * The attribute name in the Servlet context under which an instance of this class can be found.
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63 */
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64 const val SC_ATTR_NAME = "lightpit.service.DataSourceProvider"
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65
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66 /**
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67 * Timeout in seconds for the validation test.
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68 */
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69 private const val DB_TEST_TIMEOUT = 10
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70
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71 /**
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72 * The default schema to test against when validating the connection.
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73 * May be overridden by context parameter.
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74 *
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75 * @see Constants.CTX_ATTR_DB_SCHEMA
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76 */
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77 private const val DB_DEFAULT_SCHEMA = "lightpit"
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78
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79 /**
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80 * The JNDI resource name for the data source.
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81 */
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82 private const val DS_JNDI_NAME = "jdbc/lightpit/app"
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83 }
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84
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85 private fun checkConnection(ds: DataSource, testSchema: String) {
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86 try {
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87 ds.connection.use { conn ->
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88 if (!conn.isValid(DB_TEST_TIMEOUT)) {
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89 throw SQLException("Validation check failed.")
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90 }
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91 if (conn.isReadOnly) {
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92 throw SQLException("Connection is read-only and thus unusable.")
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93 }
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94 if (conn.schema != testSchema) {
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95 throw SQLException(
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96 String.format(
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97 "Connection is not configured to use the schema %s.",
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98 testSchema
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99 )
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100 )
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101 }
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102 val metaData = conn.metaData
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103 logger().info(
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104 "Connections as {} to {}/{} ready to go.",
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105 metaData.userName,
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106 metaData.url,
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107 conn.schema
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108 )
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109 }
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110 } catch (ex: SQLException) {
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111 logger().error("Checking database connection failed", ex)
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112 }
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113 }
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114
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115 private fun retrieveDataSource(ctx: Context): DataSource? {
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116 return try {
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117 val ret = ctx.lookup(DS_JNDI_NAME) as DataSource
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118 logger().info("Data source retrieved.")
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119 ret
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120 } catch (ex: NamingException) {
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121 logger().error("Data source {} not available.", DS_JNDI_NAME)
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122 logger().error("Reason for the missing data source: ", ex)
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123 null
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124 }
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125 }
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126
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127 override fun contextInitialized(sce: ServletContextEvent?) {
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128 val sc = sce!!.servletContext
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129
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130 val dbSchema = sc.getInitParameter(Constants.CTX_ATTR_DB_SCHEMA) ?: DB_DEFAULT_SCHEMA
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131 sc.getInitParameter(Constants.CTX_ATTR_DB_DIALECT)?.let { dbDialect ->
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132 try {
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133 dialect = Dialect.valueOf(dbDialect)
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134 } catch (ex: IllegalArgumentException) {
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135 logger().error(
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136 "Unknown or unsupported database dialect {}. Defaulting to {}.",
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137 dbDialect,
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138 dialect
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139 )
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140 }
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141 }
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142
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143 dataSource = try {
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144 logger().debug("Trying to access JNDI context ...")
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145 val initialCtx: Context = InitialContext()
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146 val ctx = initialCtx.lookup("java:comp/env") as Context
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147 retrieveDataSource(ctx)
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148 } catch (ex: NamingException) {
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149 logger().error("Cannot access JNDI resources.", ex)
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150 null
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151 } catch (ex: ClassCastException) {
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152 logger().error("Cannot access JNDI resources.", ex)
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153 null
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154 }
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155
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156 dataSource?.let { checkConnection(it, dbSchema) }
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157
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158 sc.setAttribute(SC_ATTR_NAME, this)
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159 logger().info("Database facade injected into ServletContext.")
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160 }
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161
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162 override fun contextDestroyed(sce: ServletContextEvent?) {
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Mike Becker <universe@uap-core.de>
parents:
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163 dataSource = null
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parents:
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164 }
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165 }

mercurial