Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/LocationProvider.java @ 2092:0ccabd82ec76

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Added missing service to invalidate the caches via the REST interface. flys-artifacts/trunk@3620 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sat, 07 Jan 2012 08:02:56 +0000
parents 97a25b54eea3
children 0c7847b8e85e
rev   line source
2063
97a25b54eea3 Part 1 of #125: added a description for a location to the WaterlevelExport.
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1 package de.intevation.flys.artifacts.model;
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2
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3 import net.sf.ehcache.Cache;
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4 import net.sf.ehcache.Element;
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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 de.intevation.flys.model.Annotation;
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9 import de.intevation.flys.model.Position;
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10
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11 import de.intevation.flys.artifacts.cache.CacheFactory;
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12 import de.intevation.flys.artifacts.model.AnnotationsFactory;
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13
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14
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15 public class LocationProvider {
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16
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17 public static final String CACHE_KEY = "location-provider";
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18
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19
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20 private static final Logger logger =
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21 Logger.getLogger(LocationProvider.class);
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22
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23
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24 private LocationProvider() {
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25 }
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26
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28 public static String getLocation(String river, double km) {
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29 return getLocation(getLocationHash(river, km), river, km);
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30 }
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31
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32
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33 public static String getLocation(String hash, String river, double km) {
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34 logger.debug("Fetch location for '" + river + "' at '" + km + "'");
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35
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36 Cache cache = CacheFactory.getCache(CACHE_KEY);
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37
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38 if (cache != null) {
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39 return getCachedLocation(cache, hash, river, km);
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40 }
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41 else {
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42 logger.info("No Cache for Locations configured.");
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43 return getUncachedLocation(river, km);
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44 }
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45 }
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46
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47
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48 protected static String getCachedLocation(
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49 Cache cache,
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50 String hash,
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51 String river,
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52 double km
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53 ) {
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54 logger.debug("Fetch location from cache.");
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55
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56 Element element = cache.get(hash);
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57
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58 if (element == null) {
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59 logger.debug("Element is not in cache yet.");
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60
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61 String location = getUncachedLocation(river, km);
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62 element = new Element(hash, location);
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63 cache.put(element);
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64 }
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65
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66 return (String) element.getValue();
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67 }
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68
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69
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70 protected static String getUncachedLocation(String river, double km) {
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71 logger.debug("Fetch location from backend.");
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72
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73 Annotation annotation = AnnotationsFactory.getAnnotation(river, km);
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74
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75 if (annotation != null) {
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76 logger.debug("Found an annotation.");
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77 Position pos = annotation.getPosition();
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78 return pos.getValue();
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79 }
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80
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81 return "";
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82 }
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83
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84
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85 protected static String getLocationHash(String river, double km) {
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86 return river + "#" + km;
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87 }
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88 }
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89 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org