Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WKmsFactory.java @ 3143:29022c93027d
FixA: Create a cached GaugeFinderFactory to access the gauge along a river
flys-artifacts/trunk@4751 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Thu, 21 Jun 2012 16:46:05 +0000 |
parents | 5642a83420f2 |
children | 0f7abd95c6e2 |
rev | line source |
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1 package de.intevation.flys.artifacts.model; |
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2 |
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3 import java.util.List; |
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4 |
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5 import net.sf.ehcache.Cache; |
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6 import net.sf.ehcache.Element; |
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7 |
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8 import org.apache.log4j.Logger; |
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9 |
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10 import org.hibernate.Session; |
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11 |
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12 import org.hibernate.SQLQuery; |
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13 import org.hibernate.type.StandardBasicTypes; |
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14 |
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15 import de.intevation.flys.artifacts.model.WKms; |
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16 import de.intevation.flys.artifacts.model.WKmsImpl; |
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17 |
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18 import de.intevation.flys.artifacts.cache.CacheFactory; |
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19 |
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20 import de.intevation.flys.backend.SessionHolder; |
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21 |
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22 /** |
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23 * Factory to access ready-made WKms for other (than computed) 'kinds' of |
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24 * WST-data. |
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25 */ |
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26 public class WKmsFactory |
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27 { |
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28 private static Logger log = Logger.getLogger(WKmsFactory.class); |
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29 |
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30 /** Query to get km and ws for wst_id and column_pos. */ |
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31 public static final String SQL_SELECT_WS = |
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32 "SELECT km, w FROM wst_w_values " + |
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33 "WHERE wst_id = :wst_id AND column_pos = :column_pos"; |
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34 |
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35 /** Query to get name for wst_id and column_pos. */ |
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36 public static final String SQL_SELECT_NAME = |
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37 "SELECT name " + |
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38 "FROM wst_columns "+ |
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39 "WHERE wst_id = :wst_id AND position = :column_pos"; |
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40 |
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41 /** Query to get name (description) for wst_id. */ |
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42 public static final String SQL_SELECT_WST_NAME = |
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43 "SELECT description from wsts "+ |
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44 "WHERE id = :wst_id"; |
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45 |
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46 |
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47 private WKmsFactory() { |
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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 * Get WKms for given column and wst_id, caring about the cache. |
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53 */ |
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54 public static WKms getWKms(int column, int wst_id) { |
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55 log.debug("WKmsFactory.getWKms"); |
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56 Cache cache = CacheFactory.getCache(StaticWKmsCacheKey.CACHE_NAME); |
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57 |
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58 StaticWKmsCacheKey cacheKey; |
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59 |
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60 if (cache != null) { |
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61 cacheKey = new StaticWKmsCacheKey(wst_id, column); |
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62 Element element = cache.get(cacheKey); |
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63 if (element != null) { |
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64 log.debug("Got static wst values from cache"); |
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65 return (WKms)element.getValue(); |
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66 } |
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67 } |
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68 else { |
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69 cacheKey = null; |
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70 } |
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71 |
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72 WKms values = getWKmsUncached(column, wst_id); |
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73 |
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74 if (values != null && cacheKey != null) { |
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75 log.debug("Store static wst values in cache."); |
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76 Element element = new Element(cacheKey, values); |
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77 cache.put(element); |
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78 } |
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79 return values; |
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80 } |
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81 |
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82 /** Get name for a WKms. */ |
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83 public static String getWKmsName(int wst_id) { |
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84 log.debug("WKmsFactory.getWKmsName wst_id/" + wst_id); |
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85 |
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86 String name = null; |
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87 Session session = SessionHolder.HOLDER.get(); |
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88 |
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89 SQLQuery nameQuery = session.createSQLQuery(SQL_SELECT_WST_NAME) |
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90 .addScalar("description", StandardBasicTypes.STRING); |
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91 nameQuery.setInteger("wst_id", wst_id); |
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92 |
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93 List<String> names = nameQuery.list(); |
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94 if (names.size() >= 1) { |
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95 name = names.get(0); |
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96 } |
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97 |
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98 return name; |
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99 } |
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100 |
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101 /** Get name for a WKms. */ |
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102 public static String getWKmsName(int column, int wst_id) { |
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103 log.debug("WKmsFactory.getWKmsName c/" + column + ", wst_id/" + wst_id); |
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104 |
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105 String name = null; |
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106 Session session = SessionHolder.HOLDER.get(); |
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107 |
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108 SQLQuery nameQuery = session.createSQLQuery(SQL_SELECT_NAME) |
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109 .addScalar("name", StandardBasicTypes.STRING); |
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110 nameQuery.setInteger("wst_id", wst_id); |
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111 nameQuery.setInteger("column_pos", column); |
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112 |
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113 List<String> names = nameQuery.list(); |
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114 if (names.size() >= 1) { |
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115 name = names.get(0); |
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116 } |
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117 |
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118 return name; |
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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 * Get WKms from db. |
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124 * @param column the position columns value |
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125 * @param wst_id database id of the wst |
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126 * @return according WKms. |
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127 */ |
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128 public static WKms getWKmsUncached(int column, int wst_id) { |
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129 |
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130 if (log.isDebugEnabled()) { |
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131 log.debug("WKmsFactory.getWKmsUncached c/" + column + ", wst_id/" + wst_id); |
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132 } |
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133 |
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134 WKmsImpl wkms = new WKmsImpl(getWKmsName(column, wst_id)); |
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135 |
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136 Session session = SessionHolder.HOLDER.get(); |
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137 SQLQuery sqlQuery = session.createSQLQuery(SQL_SELECT_WS) |
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138 .addScalar("km", StandardBasicTypes.DOUBLE) |
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139 .addScalar("w", StandardBasicTypes.DOUBLE); |
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140 sqlQuery.setInteger("wst_id", wst_id); |
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141 sqlQuery.setInteger("column_pos", column); |
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142 |
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143 List<Object []> results = sqlQuery.list(); |
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144 |
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145 double kms [] = new double[results.size()]; |
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146 double ws [] = new double[results.size()]; |
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147 |
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148 int lastColumn = Integer.MAX_VALUE; |
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149 |
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150 for (int i = 0, N = results.size(); i < N; i++) { |
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151 Object[] row = results.get(i); |
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152 wkms.add((Double) row[0], (Double) row[1]); |
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153 } |
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154 |
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155 return wkms; |
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156 } |
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157 } |
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158 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |