Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/GaugeFinderFactory.java @ 3421:c44ff50f4970

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FixA: Added a list of gauges to the output of the fixings overview service which intersect the selected fixings. flys-artifacts/trunk@5075 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 19 Jul 2012 21:12:57 +0000
parents 368d1837ce5d
children 61f4d4164a30
rev   line source
3143
29022c93027d FixA: Create a cached GaugeFinderFactory to access the gauge along a river
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1 package de.intevation.flys.artifacts.model;
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2
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3 import de.intevation.flys.artifacts.cache.CacheFactory;
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4
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5 import de.intevation.flys.backend.SessionHolder;
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6
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7 import de.intevation.flys.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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14
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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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19
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20 import org.hibernate.type.StandardBasicTypes;
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21
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22 public class GaugeFinderFactory
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23 {
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24 private static Logger log = Logger.getLogger(GaugeFinderFactory.class);
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25
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26 public static final String CACHE_NAME = "gauge-finders";
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27
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28 public static final String SQL_GAUGES =
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29 "SELECT" +
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30 " g.id AS gauge_id," +
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31 " g.name AS name," +
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32 " r.a AS a," +
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33 " r.b AS b " +
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34 "FROM gauges g" +
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35 " JOIN ranges r ON g.range_id = r.id " +
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36 "WHERE" +
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37 " g.river_id = :river_id " +
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38 "ORDER BY r.a";
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39
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40 private static GaugeFinderFactory INSTANCE;
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41
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42 protected GaugeFinderFactory() {
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43 }
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44
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45 public static synchronized GaugeFinderFactory getInstance() {
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46 if (INSTANCE == null) {
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47 INSTANCE = new GaugeFinderFactory();
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48 }
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49
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50 return INSTANCE;
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51 }
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52
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53 public GaugeFinder getGaugeFinder(String riverName) {
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54 River river = RiverFactory.getRiver(riverName);
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55 return river != null
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56 ? getGaugeFinder(river.getId(), river.getKmUp())
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57 : null;
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58 }
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59
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60 public synchronized GaugeFinder getGaugeFinder(
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61 int riverId,
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62 boolean isKmUp
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63 ) {
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64 Cache cache = CacheFactory.getCache(CACHE_NAME);
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65
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66 if (cache == null) {
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67 return getUncached(riverId, isKmUp);
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68 }
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69
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70 String cacheKey = riverId + "-" + isKmUp;
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71 Element element = cache.get(cacheKey);
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72
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73 if (element != null) {
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74 return (GaugeFinder)element.getValue();
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75 }
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76
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77 GaugeFinder finder = getUncached(riverId, isKmUp);
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78
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79 if (finder != null) {
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80 cache.put(new Element(cacheKey, finder));
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81 }
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82
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83 return finder;
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84 }
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85
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86 protected GaugeFinder loadGauges(
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87 Session session,
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88 int riverId,
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89 boolean isKmUp
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90 ) {
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91 SQLQuery query = session.createSQLQuery(SQL_GAUGES)
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92 .addScalar("gauge_id", StandardBasicTypes.INTEGER)
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93 .addScalar("name", StandardBasicTypes.STRING)
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94 .addScalar("a", StandardBasicTypes.DOUBLE)
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95 .addScalar("b", StandardBasicTypes.DOUBLE);
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96
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97 query.setInteger("river_id", riverId);
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98
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99 List<Object []> list = query.list();
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100
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101 if (list.isEmpty()) {
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102 log.warn("River " + riverId + " has no gauges.");
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103 return null;
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104 }
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105
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106 List<GaugeRange> gauges = new ArrayList<GaugeRange>();
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107
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108 for (Object [] row: list) {
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109 int gaugeId = (Integer)row[0];
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110 String name = (String) row[1];
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111 double start = (Double) row[2];
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112 double end = (Double) row[3];
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113 GaugeRange gauge = new GaugeRange(start, end, name, gaugeId);
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114 gauges.add(gauge);
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115 }
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116
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117 return new GaugeFinder(gauges, isKmUp);
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118 }
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119
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120 protected GaugeFinder getUncached(int riverId, boolean isKmUp) {
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121 Session session = SessionHolder.HOLDER.get();
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122
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123 GaugeFinder finder = loadGauges(session, riverId, isKmUp);
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124
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125 if (finder == null
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126 || !finder.loadDischargeSectors(session, riverId)) {
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127 return null;
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128 }
3152
368d1837ce5d Removed trailing whitespace.
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129
3143
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130 return finder;
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131 }
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132 }
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133 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org