Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/GaugeFinderFactory.java @ 5838:5aa05a7a34b7

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Rename modules to more fitting names.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 15:23:37 +0200
parents flys-artifacts/src/main/java/org/dive4elements/river/artifacts/model/GaugeFinderFactory.java@bd047b71ab37
children 4897a58c8746
rev   line source
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1 package org.dive4elements.river.artifacts.model;
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2
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3 import org.dive4elements.river.artifacts.cache.CacheFactory;
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4
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5 import org.dive4elements.river.backend.SessionHolder;
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6
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7 import org.dive4elements.river.model.River;
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8
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9 import java.util.ArrayList;
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10 import java.util.List;
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12 import net.sf.ehcache.Cache;
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13 import net.sf.ehcache.Element;
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15 import org.apache.log4j.Logger;
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17 import org.hibernate.SQLQuery;
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18 import org.hibernate.Session;
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20 import org.hibernate.type.StandardBasicTypes;
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21
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61f4d4164a30 Doc, cosmetics.
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22 /** Get GaugeFinders. */
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23 public class GaugeFinderFactory
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24 {
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25 private static Logger log = Logger.getLogger(GaugeFinderFactory.class);
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26
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27 public static final String CACHE_NAME = "gauge-finders";
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28
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29 public static final String SQL_GAUGES =
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30 "SELECT" +
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31 " g.id AS gauge_id," +
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32 " g.name AS name," +
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33 " r.a AS a," +
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34 " r.b AS b " +
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35 "FROM gauges g" +
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36 " JOIN ranges r ON g.range_id = r.id " +
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37 "WHERE" +
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38 " g.river_id = :river_id " +
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39 "ORDER BY r.a";
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40
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41 private static GaugeFinderFactory INSTANCE;
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42
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43 protected GaugeFinderFactory() {
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44 }
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45
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46 public static synchronized GaugeFinderFactory getInstance() {
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47 if (INSTANCE == null) {
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48 INSTANCE = new GaugeFinderFactory();
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49 }
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50
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51 return INSTANCE;
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52 }
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53
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54 public GaugeFinder getGaugeFinder(String riverName) {
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55 River river = RiverFactory.getRiver(riverName);
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56 return river != null
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57 ? getGaugeFinder(river.getId(), river.getKmUp())
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58 : null;
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59 }
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60
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61 public synchronized GaugeFinder getGaugeFinder(
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62 int riverId,
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63 boolean isKmUp
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64 ) {
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65 Cache cache = CacheFactory.getCache(CACHE_NAME);
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66
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67 if (cache == null) {
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68 return getUncached(riverId, isKmUp);
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69 }
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71 String cacheKey = riverId + "-" + isKmUp;
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72 Element element = cache.get(cacheKey);
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73
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74 if (element != null) {
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75 return (GaugeFinder)element.getValue();
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76 }
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78 GaugeFinder finder = getUncached(riverId, isKmUp);
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79
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80 if (finder != null) {
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81 cache.put(new Element(cacheKey, finder));
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82 }
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83
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84 return finder;
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85 }
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86
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87 protected GaugeFinder loadGauges(
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88 Session session,
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89 int riverId,
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90 boolean isKmUp
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91 ) {
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92 SQLQuery query = session.createSQLQuery(SQL_GAUGES)
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93 .addScalar("gauge_id", StandardBasicTypes.INTEGER)
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94 .addScalar("name", StandardBasicTypes.STRING)
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95 .addScalar("a", StandardBasicTypes.DOUBLE)
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96 .addScalar("b", StandardBasicTypes.DOUBLE);
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97
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98 query.setInteger("river_id", riverId);
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99
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100 List<Object []> list = query.list();
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101
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102 if (list.isEmpty()) {
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103 log.warn("River " + riverId + " has no gauges.");
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104 return null;
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105 }
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106
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107 List<GaugeRange> gauges = new ArrayList<GaugeRange>();
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108
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109 for (Object [] row: list) {
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110 int gaugeId = (Integer)row[0];
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111 String name = (String) row[1];
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112 double start = (Double) row[2];
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113 double end = (Double) row[3];
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114 GaugeRange gauge = new GaugeRange(start, end, name, gaugeId);
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115 gauges.add(gauge);
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116 }
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117
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118 return new GaugeFinder(gauges, isKmUp);
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119 }
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120
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121 protected GaugeFinder getUncached(int riverId, boolean isKmUp) {
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122 Session session = SessionHolder.HOLDER.get();
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123
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124 GaugeFinder finder = loadGauges(session, riverId, isKmUp);
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125
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126 if (finder == null
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127 || !finder.loadDischargeSectors(session, riverId)) {
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128 return null;
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129 }
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368d1837ce5d Removed trailing whitespace.
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130
3143
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131 return finder;
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132 }
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133 }
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134 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org