Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/SQOverviewFactory.java @ 6152:0587819960c3
Waterlevel differences & bed height differences: Add new model LinearInterpolated intented to unify the two very similiar calculations. The focus of the current implementation is correctness and not speed! The fact that the data sets more mostly sorted by station is not exploited. Doing so would improve performance significantly.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Sun, 02 Jun 2013 17:52:53 +0200 |
parents | af13ceeba52a |
children | 0a5239a1e46e |
rev | line source |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.artifacts.model; |
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10 |
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11 import org.dive4elements.river.artifacts.cache.CacheFactory; |
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12 |
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13 import org.dive4elements.river.backend.SedDBSessionHolder; |
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14 |
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15 import net.sf.ehcache.Cache; |
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16 import net.sf.ehcache.Element; |
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17 |
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18 import org.apache.log4j.Logger; |
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19 |
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20 import org.hibernate.Session; |
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21 |
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22 public class SQOverviewFactory { |
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23 |
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24 private static Logger log = Logger.getLogger(SQOverviewFactory.class); |
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25 |
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26 public static final String CACHE_NAME = "sq-overviews"; |
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27 |
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28 private SQOverviewFactory() { |
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29 } |
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30 |
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31 |
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32 public static SQOverview getOverview(String river) { |
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33 |
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34 boolean debug = log.isDebugEnabled(); |
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35 |
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36 if (debug) { |
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37 log.debug( |
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38 "Looking for sq overview for river '" + river + "'"); |
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39 } |
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40 |
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41 Cache cache = CacheFactory.getCache(CACHE_NAME); |
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42 |
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43 if (cache == null) { |
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44 if (debug) { |
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45 log.debug("Cache not configured."); |
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46 } |
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47 return getUncached(river); |
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48 } |
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49 |
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50 String key = "sq-over-" + river; |
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51 |
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52 Element element = cache.get(key); |
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53 |
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54 if (element != null) { |
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55 if (debug) { |
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56 log.debug("Overview found in cache"); |
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57 } |
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58 return (SQOverview)element.getValue(); |
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59 } |
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60 |
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61 SQOverview overview = getUncached(river); |
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62 |
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63 if (overview != null) { |
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64 if (debug) { |
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65 log.debug("Store overview in cache."); |
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66 } |
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67 cache.put(new Element(key, overview)); |
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68 } |
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69 |
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70 return overview; |
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71 } |
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72 |
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73 public static SQOverview getUncached(String river) { |
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74 SQOverview overview = new SQOverview(river); |
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75 |
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76 Session session = SedDBSessionHolder.HOLDER.get(); |
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77 |
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78 return overview.load(session) ? overview : null; |
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79 } |
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80 } |
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81 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |