Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/CrossSectionKMService.java @ 1999:02ce03329ef5

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Some optimizations during out() operation of FLYSArtifactCollection. flys-artifacts/trunk@3437 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 16 Dec 2011 11:47:57 +0000
parents e0b081105a82
children f021080cb409
rev   line source
1749
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1 package de.intevation.flys.artifacts.services;
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2
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3 import de.intevation.artifacts.CallMeta;
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4 import de.intevation.artifacts.GlobalContext;
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5
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6 import de.intevation.artifacts.common.utils.XMLUtils;
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7
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8 import de.intevation.flys.artifacts.cache.CacheFactory;
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9
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10 import de.intevation.flys.backend.SessionHolder;
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11
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12 import de.intevation.flys.model.CrossSection;
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13 import de.intevation.flys.model.CrossSectionLine;
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14
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15 import java.util.AbstractMap;
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16 import java.util.ArrayDeque;
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17 import java.util.Deque;
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18 import java.util.List;
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19 import java.util.Map;
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20 import java.util.NavigableMap;
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21
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22 import java.util.concurrent.ConcurrentSkipListMap;
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23
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24 import net.sf.ehcache.Cache;
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25
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26 import org.apache.log4j.Logger;
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27
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28 import org.hibernate.Query;
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29 import org.hibernate.Session;
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30
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31 import org.w3c.dom.Document;
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32 import org.w3c.dom.Element;
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33 import org.w3c.dom.NodeList;
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34
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35
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36 /**
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37 * Service to find the next/previous km (measurement) of cross sections.
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38 * Looking at the query for a single cross-section id at a single km, the
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39 * service does the following:
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40 *
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41 * It returns the km itself if a measurement at that km was found and
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42 * the N nearest other measurement points in both directions.
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43 *
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44 * That means, you can pass N=0 to find out whether a measurement at given km
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45 * exists.
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46 *
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47 * If less than N neighbours exist in one direction, less are delivered
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48 * (e.g. given measurements at [0,2,3,4,5,7,8,9] a query for km=8, N=3 will
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49 * result in [4,5,7,8,9]).
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50 */
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51 public class CrossSectionKMService
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52 extends FLYSService
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53 {
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54 private static Logger logger =
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55 Logger.getLogger(CrossSectionKMService.class);
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56
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57 public static final String CACHE_NAME = "cross-section-kms";
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58
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59
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60 /** Trivial constructor. */
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61 public CrossSectionKMService() {
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62 }
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63
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64
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65 /**
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66 * @param data
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67 */
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68 @Override
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69 public Document doProcess(
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70 Document data,
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71 GlobalContext globalContext,
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72 CallMeta callMeta
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73 ) {
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74 logger.debug("CrossSectionKMService.doProcess");
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75
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76 NodeList crossSectionNodes =
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77 data.getElementsByTagName("art:cross-section");
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78
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79 Cache cache = CacheFactory.getCache(CACHE_NAME);
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80
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81 Document document = XMLUtils.newDocument();
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82
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83 Element all = document.createElement("cross-sections");
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84
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85 for (int i = 0, CS = crossSectionNodes.getLength(); i < CS; ++i) {
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86 Element crossSectionElement = (Element)crossSectionNodes.item(i);
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87
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88 String idString = crossSectionElement.getAttribute("id");
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89 String kmString = crossSectionElement.getAttribute("km");
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90 String neighborsString = crossSectionElement.getAttribute("n");
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91
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92 if (idString.length() == 0 || kmString.length() == 0) {
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93 logger.debug("missing attributes in cross-section element");
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94 continue;
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95 }
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96
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97 double km;
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98 Integer crossSectionId;
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99 int N = 2;
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100
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101 try {
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102 km = Double.parseDouble(kmString);
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103 crossSectionId = Integer.valueOf(idString);
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104
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105 if (neighborsString.length() > 0) {
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106 N = Integer.parseInt(neighborsString);
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107 }
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108 }
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109 catch (NumberFormatException nfe) {
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110 logger.debug("converting number failed", nfe);
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111 continue;
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112 }
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113
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114 NavigableMap<Double, Integer> map;
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115
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116 if (cache == null) {
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117 map = getUncached(crossSectionId);
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118 }
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119 else {
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120 net.sf.ehcache.Element element = cache.get(crossSectionId);
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121 if (element == null) {
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122 map = getUncached(crossSectionId);
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123 if (map != null) {
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124 element = new net.sf.ehcache.Element(
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125 crossSectionId, map);
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126 cache.put(element);
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127 }
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128 }
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129 else {
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130 map = (NavigableMap<Double, Integer>)element.getValue();
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131 }
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132 }
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133
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134 if (map == null) {
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135 logger.debug("cannot find cross section " + crossSectionId);
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136 continue;
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137 }
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138
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139 Deque<Map.Entry<Double, Integer>> result =
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140 nearestNeighbors(map, km, N);
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141
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142 if (!result.isEmpty()) {
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143 Element csE = document.createElement("cross-section");
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144 csE.setAttribute("id", idString);
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145 for (Map.Entry<Double, Integer> entry: result) {
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146 Element lineE = document.createElement("line");
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147 lineE.setAttribute(
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148 "line-id", String.valueOf(entry.getValue()));
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149 lineE.setAttribute(
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150 "km", String.valueOf(entry.getKey()));
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151 csE.appendChild(lineE);
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152 }
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153 all.appendChild(csE);
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154 }
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155 }
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156
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157 document.appendChild(all);
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158
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159 return document;
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160 }
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161
1961
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162
4781096f31f8 Mainly documentation.
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163 /**
4781096f31f8 Mainly documentation.
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164 * @param km the kilometer from which to start searching for other
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165 * measurements
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166 * @param N number of neighboring measurements to find.
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167 */
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168 public static Deque<Map.Entry<Double, Integer>> nearestNeighbors(
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169 NavigableMap<Double, Integer> map,
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170 double km,
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171 int N
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172 ) {
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173 Deque<Map.Entry<Double, Integer>> result =
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174 new ArrayDeque<Map.Entry<Double, Integer>>(2*N);
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175
1961
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176 if(map.get(km) != null) {
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177 result.add(new AbstractMap.SimpleEntry<Double, Integer>(km,map.get(km)));
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178
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179 }
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180
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181 int i = 0;
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182 for (Map.Entry<Double, Integer> entry:
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parents:
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183 map.headMap(km, false).descendingMap().entrySet()) {
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184 if (i++ >= N) {
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185 break;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
186 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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187 result.addFirst(entry);
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188 }
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189
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190 i = 0;
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parents:
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191 for (Map.Entry<Double, Integer> entry:
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parents:
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192 map.tailMap(km, false).entrySet()) {
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parents:
diff changeset
193 if (i++ >= N) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
194 break;
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parents:
diff changeset
195 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
196 result.addLast(entry);
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parents:
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197 }
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198
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parents:
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199 return result;
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parents:
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200 }
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201
1961
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202
4781096f31f8 Mainly documentation.
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203 /**
4781096f31f8 Mainly documentation.
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204 * @param crossSectionId id of queried cross-section (in db).
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205 * @return Mapping from kilometer to db-id.
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parents: 1749
diff changeset
206 */
1749
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parents:
diff changeset
207 public static NavigableMap<Double, Integer> getUncached(
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parents:
diff changeset
208 Integer crossSectionId
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parents:
diff changeset
209 ) {
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parents:
diff changeset
210 NavigableMap<Double, Integer> result =
f7d890f4855f Added Service Service to lookup the Nth nearest neighbors for a set of given cross section ids and kms.
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parents:
diff changeset
211 new ConcurrentSkipListMap<Double, Integer>();
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212
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
213 Session session = SessionHolder.HOLDER.get();
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
214 Query query = session.createQuery(
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parents:
diff changeset
215 "from CrossSection where id=:id");
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parents:
diff changeset
216 query.setParameter("id", crossSectionId);
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217
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parents:
diff changeset
218 List<CrossSection> crossSections = query.list();
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parents:
diff changeset
219 if (crossSections.isEmpty()) {
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parents:
diff changeset
220 return null;
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parents:
diff changeset
221 }
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parents:
diff changeset
222
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parents:
diff changeset
223 CrossSection crossSection = crossSections.get(0);
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parents:
diff changeset
224 List<CrossSectionLine> lines = crossSection.getLines();
f7d890f4855f Added Service Service to lookup the Nth nearest neighbors for a set of given cross section ids and kms.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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225
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226 for (CrossSectionLine line: lines) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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227 Double km = line.getKm().doubleValue();
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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228 Integer id = line.getId();
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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229 result.put(km, id);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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230 }
f7d890f4855f Added Service Service to lookup the Nth nearest neighbors for a set of given cross section ids and kms.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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231
f7d890f4855f Added Service Service to lookup the Nth nearest neighbors for a set of given cross section ids and kms.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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232 return result;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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233 }
f7d890f4855f Added Service Service to lookup the Nth nearest neighbors for a set of given cross section ids and kms.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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234 }
f7d890f4855f Added Service Service to lookup the Nth nearest neighbors for a set of given cross section ids and kms.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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235 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org