Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/config/Configuration.java @ 1122:1985d5db0feb

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Implemented a global configuration that should be used to initialize the geobackend. geo-backend/trunk@1149 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 03 Jun 2010 13:31:07 +0000
parents
children ebeb56428409
rev   line source
1122
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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1 package de.intevation.gnv.geobackend.config;
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2
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
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3 import de.intevation.gnv.geobackend.base.connectionpool.ConnectionPoolFactory;
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4
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5 import de.intevation.gnv.geobackend.base.query.container.QueryContainerFactory;
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6
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7 import de.intevation.gnv.geobackend.base.query.container.exception.QueryContainerException;
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8
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9 import de.intevation.gnv.geobackend.util.XMLUtils;
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10
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11 import java.io.FileInputStream;
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12 import java.io.FileNotFoundException;
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13 import java.io.IOException;
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14 import java.io.InputStream;
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15
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16 import java.util.Properties;
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17
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18 import javax.xml.xpath.XPathConstants;
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19
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20 import org.apache.log4j.Logger;
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21
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22 import org.w3c.dom.Document;
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23 import org.w3c.dom.Node;
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24 import org.w3c.dom.NodeList;
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25
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26 /**
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27 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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28 */
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29 public final class Configuration {
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30
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31 public static final String CONFIGURATION_ROOT = "geo-backend";
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32 public static final String XPATH_QUERIES = "query-configuration";
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33 public static final String XPATH_BACKEND = "backend-configuration";
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34 public static final String XPATH_CACHE = "cache";
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35 public static final String XPATH_CACHE_ENABLED = "@enabled";
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36 public static final String XPATH_CACHE_CONFIG = "configuration";
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37
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38 private static Logger logger = Logger.getLogger(Configuration.class);
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39
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40 private static Configuration instance;
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41
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42 private Node config;
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43 private String configDir;
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44 private String placeholder;
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45
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46 private boolean cacheEnabled;
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47 private String cacheConfiguration;
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48
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49
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50
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51 /**
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52 * Returns an instance of Configuration.
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53 *
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54 * @return an instance of Configuration.
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55 */
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56 public static Configuration getInstance() {
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57 if (instance == null)
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58 instance = new Configuration();
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59
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60 return instance;
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61 }
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62
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63
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64 /**
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65 * Constructor that creates a new Configuration object with disabled cache.
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66 */
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67 public Configuration() {
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68 cacheEnabled = false;
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69 }
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70
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71
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72 /**
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73 * Initialize the geo-backend before it is ready to be used. This method
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74 * calls other <i>init*</i> methods.
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75 *
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76 * @param conf A configuration document. This document should contain a node
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77 * <i>geo-backend</i>. If there are more nodes named <i>geo-backend</i>, the
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78 * first node is used.
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79 * @param configDir The path to the root configuration directory.
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80 * @param placeholder The placeholder used in the configuration document for
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81 * the root configuration directory.
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82 */
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83 public void init(Document conf, String configDir, String placeholder)
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84 throws QueryContainerException, FileNotFoundException, IOException
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85 {
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86 this.config = conf;
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87 this.configDir = configDir;
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88 this.placeholder = placeholder;
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89
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90 NodeList root = conf.getElementsByTagName(CONFIGURATION_ROOT);
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91 if (root == null || root.getLength() == 0) {
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92 logger.error("No valid configuration for this geobackend given!");
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93 return;
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94 }
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95
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96 initQueries(root.item(0));
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97 initConnection(root.item(0));
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98 initCache(root.item(0));
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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 * Initialize sql statements.
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104 *
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105 * @param conf The geo-backend configuration node.
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106 */
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107 protected void initQueries(Node conf)
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108 throws FileNotFoundException, IOException, QueryContainerException
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109 {
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110 String queriesFile = (String) XMLUtils.xpath(
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111 conf, XPATH_QUERIES, XPathConstants.STRING, null);
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112
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113 queriesFile = replaceConfigDir(queriesFile);
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114 logger.info("Initialize queries: " + queriesFile);
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115
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116 Properties queries = getProperties(queriesFile);
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117 QueryContainerFactory qcf = QueryContainerFactory.getInstance();
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118 qcf.initializeQueryContainer(queries);
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119 }
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120
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121
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122 /**
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123 * Initialize necessary objects used for the database connection.
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124 *
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125 * @param connection The geo-backend configuration node.
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126 */
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127 protected void initConnection(Node connection)
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128 throws FileNotFoundException, IOException
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129 {
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130 String config = (String)XMLUtils.xpath(
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131 connection, XPATH_BACKEND, XPathConstants.STRING, null);
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132
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133 config = replaceConfigDir(config);
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134 logger.info("Initialize database connection: " + config);
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135
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136 Properties properties = getProperties(config);
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137 ConnectionPoolFactory cpf = ConnectionPoolFactory.getInstance();
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138 cpf.initializeConnectionPool(properties);
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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 * Initialize necessary objects used for the sql cache.
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144 *
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145 * @param conf The geo-backend configuration node.
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146 */
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147 protected void initCache(Node conf) {
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148 Node cache = (Node) XMLUtils.xpath(
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149 conf, XPATH_CACHE, XPathConstants.NODE, null);
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150
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151 String on = (String) XMLUtils.xpath(
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152 cache, XPATH_CACHE_ENABLED, XPathConstants.STRING, null);
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153
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154 boolean enabled = Boolean.parseBoolean(on);
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155
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156 if (enabled) {
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157 String config = (String) XMLUtils.xpath(
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158 cache, XPATH_CACHE_CONFIG, XPathConstants.STRING, null);
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159
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160 if (config != null && config.length() > 0) {
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161 config = replaceConfigDir(config);
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162 logger.info("Initialize sql cache with config: " + config);
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163
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164 this.cacheConfiguration = config;
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165 this.cacheEnabled = true;
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166 }
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167 else {
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168 logger.error("SQL cache is enabled, " +
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169 "but no configuration was found.");
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170 }
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171 }
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172 else {
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173 logger.info("SQL cache is disabled.");
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174 }
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175 }
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176
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177
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178 /**
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179 * Replace placeholder in the configuration. Placeholder are used for the
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180 * base configuration directory.
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181 *
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182 * @param path A string that might contain placeholders.
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183 *
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184 * @return <i>path</i> with replaced placeholder.
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185 */
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186 protected String replaceConfigDir(String path) {
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187 return path.replace(placeholder, configDir);
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188 }
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189
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190
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191 /**
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192 * Read a file that contains properties and return a Java Properties object.
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193 *
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194 * @param path Path to a properties file.
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195 *
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196 * @return the properties contained in the file.
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197 */
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198 protected Properties getProperties(String path)
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199 throws FileNotFoundException, IOException
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200 {
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201 InputStream inputStream = null;
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202
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203 try {
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204 inputStream = new FileInputStream(path);
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205 Properties properties = new Properties();
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206 properties.load(inputStream);
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207
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208 return properties;
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209 }
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210 finally {
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211 if (inputStream != null) {
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212 try {
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213 inputStream.close();
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214 }
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215 catch (IOException ioe) {
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216 }
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217 }
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218 }
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219 }
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220
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221
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222 /**
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223 * Returns the state of the cache.
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224 *
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225 * @return true if sql queries are cache, otherwise false.
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226 */
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227 public boolean isCacheEnabled() {
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228 return cacheEnabled;
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229 }
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230
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231
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232 /**
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233 * Returns the path of the cache configuration file.
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234 *
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
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235 * @return configuration path.
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236 */
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237 public String getCacheConfiguration() {
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238 return cacheConfiguration;
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239 }
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240 }
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241 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org