Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/DistanceInfoService.java @ 1022:930a9ce24294

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Datacage: Fixed caching issue leading to incorrect results. flys-artifacts/trunk@2480 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 10 Aug 2011 08:43:38 +0000
parents a63d79107289
children b1ed0ec0236f
rev   line source
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1 package de.intevation.flys.artifacts.services;
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2
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3 import java.math.BigDecimal;
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4 import java.util.Iterator;
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5
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6 import org.apache.log4j.Logger;
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7
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8 import org.w3c.dom.Document;
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9 import org.w3c.dom.Element;
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10
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11 import de.intevation.artifacts.CallMeta;
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12 import de.intevation.artifacts.GlobalContext;
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13
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14 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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15 import de.intevation.artifacts.common.utils.XMLUtils;
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16
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17 import de.intevation.artifactdatabase.DefaultService;
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18
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19 import de.intevation.flys.backend.SessionHolder;
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20 import de.intevation.flys.model.Annotation;
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21 import de.intevation.flys.model.Attribute;
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22 import de.intevation.flys.model.Position;
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23 import de.intevation.flys.model.Range;
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24 import de.intevation.flys.model.Edge;
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26 import de.intevation.flys.artifacts.model.AnnotationsFactory;
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27
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28 import org.hibernate.Session;
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30 import de.intevation.flys.artifacts.cache.CacheFactory;
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31
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32 import net.sf.ehcache.Cache;
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34 /**
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35 * This service provides information about distances of a specified river.
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36 *
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37 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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38 */
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39 public class DistanceInfoService extends DefaultService {
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41 private static enum DistanceFilter {
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42 NONE, LOCATIONS, DISTANCES
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43 }
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45 /** The logger used in this service.*/
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46 private static Logger logger = Logger.getLogger(DistanceInfoService.class);
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47
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48 public static final String CACHE_NAME = "service-distanceinfo";
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49
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50 public static final String RIVER_XPATH = "/art:river/text()";
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51
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52 public static final String FILTER_XPATH = "/art:river/art:filter/text()";
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54
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55 /**
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56 * The default constructor.
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57 */
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58 public DistanceInfoService() {
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59 }
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61
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62 @Override
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63 public Document process(
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64 Document data,
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65 GlobalContext globalContext,
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66 CallMeta callMeta
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67 ) {
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68 logger.debug("DistanceInfoService.process");
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69
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70 String river = XMLUtils.xpathString(
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71 data, RIVER_XPATH, ArtifactNamespaceContext.INSTANCE);
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72
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73 String filter = XMLUtils.xpathString(
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74 data, FILTER_XPATH, ArtifactNamespaceContext.INSTANCE);
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75
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76 if (river == null || (river = river.trim()).length() == 0) {
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77 logger.warn("No river specified. Cannot return distance info!");
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78 return XMLUtils.newDocument();
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79 }
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80
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81 logger.debug("Search distances for river: " + river);
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82
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83 Cache cache = CacheFactory.getCache(CACHE_NAME);
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84
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85 if (cache == null) {
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86 logger.debug("no cache configured for distance info");
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87 return getUncached(river, filter);
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88 }
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91 String key = getCacheKey(river, filter);
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92
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93 net.sf.ehcache.Element element = cache.get(key);
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94
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95 if (element != null) {
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96 logger.debug("distance info found in cache");
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97 return (Document)element.getValue();
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98 }
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99
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100 Document result = getUncached(river, filter);
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101
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102 element = new net.sf.ehcache.Element(key, result);
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103
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104 logger.debug("store distance info found into cache");
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105
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106 cache.put(element);
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107
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108 return result;
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109 }
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112 protected String getCacheKey(String river, String filtertype) {
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113 return filtertype != null && filtertype.length() > 0
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114 ? river + "_" + filtertype
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115 : river;
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116 }
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117
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118
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119 protected Document getUncached(String river, String filtertype) {
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120
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121 Document result = XMLUtils.newDocument();
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122
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123 Session session = SessionHolder.acquire();
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124
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125 try {
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126 Iterator<Annotation> iter =
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127 AnnotationsFactory.getAnnotationsIterator(river);
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128
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129 Element all = result.createElement("distances");
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130
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131 DistanceFilter filter = getDistanceFilter(filtertype);
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132
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133 while (iter.hasNext()) {
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134 Annotation a = iter.next();
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135 Element distance = buildDistanceNode(result, a, filter);
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136
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137 if (distance != null) {
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138 all.appendChild(distance);
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139 }
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140 }
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141
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142 result.appendChild(all);
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143 }
314
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144 finally {
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145 session.close();
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146 SessionHolder.release();
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147 }
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148
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149 return result;
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150 }
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151
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152
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153 protected static DistanceFilter getDistanceFilter(String type) {
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154 if (type.equals("locations")) {
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155 logger.debug("Found 'location' filter.");
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156 return DistanceFilter.LOCATIONS;
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157 }
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158 else if (type.equals("distances")) {
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159 logger.debug("Found 'distances' filter.");
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160 return DistanceFilter.DISTANCES;
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161 }
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162
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163 logger.debug("Do not use any filter at all.");
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164
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165 return DistanceFilter.NONE;
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166 }
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167
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168
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169 /**
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170 * This method build an Element for a distance info.
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171 *
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172 * @param ec The ElementCreator.
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173 * @param anno The Annotation that provides information about the distance.
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174 *
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175 * @return an Element that contains information about a distance.
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176 */
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177 protected static Element buildDistanceNode(
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178 Document document,
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179 Annotation anno,
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180 DistanceFilter filter
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181 ) {
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182 Position pos = anno.getPosition();
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183 Range range = anno.getRange();
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184 Attribute attr = anno.getAttribute();
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185 Edge edge = anno.getEdge();
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186 BigDecimal a = range.getA();
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187 BigDecimal b = range.getB();
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188
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189 if (b == null && filter == DistanceFilter.DISTANCES) {
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190 return null;
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191 }
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192
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193 if (b != null && filter == DistanceFilter.LOCATIONS) {
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194 return null;
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195 }
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196
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197 Element distance = document.createElement("distance");
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198
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199 distance.setAttribute("description", pos.getValue());
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200
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201 String riverSide = attr.getValue();
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202
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203 if (riverSide != null && riverSide.length() > 0) {
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204 distance.setAttribute("riverside", riverSide);
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205 }
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206
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207 if (a != null) {
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208 distance.setAttribute("from", a.toString());
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209 }
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210 if (b != null) {
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211 distance.setAttribute("to", b.toString());
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212 }
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213 if (edge != null) {
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214 BigDecimal bottom = edge.getBottom();
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215 BigDecimal top = edge.getTop();
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216 if (bottom != null) {
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217 distance.setAttribute("bottom", bottom.toString());
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218 }
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219 if (top != null) {
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220 distance.setAttribute("top", top.toString());
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221 }
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222 }
301
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223
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224 return distance;
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225 }
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226 }
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227 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org