Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/GaugeFinderFactory.java @ 3152:368d1837ce5d

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Removed trailing whitespace. flys-artifacts/trunk@4762 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sat, 23 Jun 2012 08:09:42 +0000
parents 29022c93027d
children c44ff50f4970
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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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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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 " r.a AS a," +
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32 " r.b AS b " +
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33 "FROM gauges g" +
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34 " JOIN ranges r ON g.range_id = r.id " +
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35 "WHERE" +
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36 " g.river_id = :river_id " +
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37 "ORDER BY r.a";
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38
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39 private static GaugeFinderFactory INSTANCE;
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40
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41 protected GaugeFinderFactory() {
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42 }
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43
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44 public static synchronized GaugeFinderFactory getInstance() {
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45 if (INSTANCE == null) {
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46 INSTANCE = new GaugeFinderFactory();
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47 }
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48
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49 return INSTANCE;
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50 }
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51
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52 public GaugeFinder getGaugeFinder(String riverName) {
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53 River river = RiverFactory.getRiver(riverName);
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54 return river != null
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55 ? getGaugeFinder(river.getId(), river.getKmUp())
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56 : null;
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57 }
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58
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59 public synchronized GaugeFinder getGaugeFinder(
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60 int riverId,
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61 boolean isKmUp
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62 ) {
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63 Cache cache = CacheFactory.getCache(CACHE_NAME);
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64
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65 if (cache == null) {
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66 return getUncached(riverId, isKmUp);
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67 }
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68
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69 String cacheKey = riverId + "-" + isKmUp;
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70 Element element = cache.get(cacheKey);
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71
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72 if (element != null) {
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73 return (GaugeFinder)element.getValue();
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74 }
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75
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76 GaugeFinder finder = getUncached(riverId, isKmUp);
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77
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78 if (finder != null) {
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79 cache.put(new Element(cacheKey, finder));
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80 }
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81
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82 return finder;
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83 }
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84
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85 protected GaugeFinder loadGauges(
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86 Session session,
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87 int riverId,
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88 boolean isKmUp
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89 ) {
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90 SQLQuery query = session.createSQLQuery(SQL_GAUGES)
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91 .addScalar("gauge_id", StandardBasicTypes.INTEGER)
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92 .addScalar("a", StandardBasicTypes.DOUBLE)
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93 .addScalar("b", StandardBasicTypes.DOUBLE);
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94
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95 query.setInteger("river_id", riverId);
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96
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97 List<Object []> list = query.list();
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98
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99 if (list.isEmpty()) {
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100 log.warn("River " + riverId + " has no gauges.");
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101 return null;
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102 }
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103
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104 List<GaugeRange> gauges = new ArrayList<GaugeRange>();
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105
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106 for (Object [] row: list) {
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107 int gaugeId = (Integer)row[0];
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108 double start = (Double) row[1];
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109 double end = (Double) row[2];
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110 GaugeRange gauge = new GaugeRange(start, end, gaugeId);
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111 gauges.add(gauge);
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112 }
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113
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114 return new GaugeFinder(gauges, isKmUp);
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115 }
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116
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117 protected GaugeFinder getUncached(int riverId, boolean isKmUp) {
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118 Session session = SessionHolder.HOLDER.get();
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119
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120 GaugeFinder finder = loadGauges(session, riverId, isKmUp);
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121
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122 if (finder == null
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123 || !finder.loadDischargeSectors(session, riverId)) {
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124 return null;
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125 }
3152
368d1837ce5d Removed trailing whitespace.
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126
3143
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127 return finder;
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128 }
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129 }
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130 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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