Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/CachingQueryExecutorFactory.java @ 897:02cd2935b5fa

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Removed trailing whitespace. geo-backend/trunk@1013 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 28 Apr 2010 07:04:19 +0000
parents eb777022b628
children 1985d5db0feb
rev   line source
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1 package de.intevation.gnv.geobackend.base.query;
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2
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3 import java.util.Collection;
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4 import java.util.Iterator;
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5
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6 import net.sf.ehcache.Cache;
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7 import net.sf.ehcache.CacheManager;
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8 import net.sf.ehcache.Element;
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9
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10 import org.apache.log4j.Logger;
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12 import de.intevation.gnv.geobackend.base.Result;
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13 import de.intevation.gnv.geobackend.base.query.cache.CacheCleaner;
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14
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15 /**
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16 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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17 */
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18 public class CachingQueryExecutorFactory
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19 extends QueryExecutorFactory
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20 {
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21 public static final String QUERY_EXECUTOR_FACTORY = "caching.query.executor.config";
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22 public static final String CACHE_NAME = "sql.cache";
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23
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24 private static Logger log = Logger.getLogger(CachingQueryExecutorFactory.class);
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25
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26 protected CacheManager manager;
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27
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28 public CachingQueryExecutorFactory() {
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29 log.info("using SQL cache");
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30 String configFile = System.getProperty(QUERY_EXECUTOR_FACTORY);
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31 manager = configFile != null
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32 ? new CacheManager(configFile)
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33 : new CacheManager();
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34 manager.addCache(CACHE_NAME);
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35 CacheCleaner cc = new CacheCleaner();
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36 cc.start();
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37 }
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38
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39 public QueryExecutor getQueryExecutor() {
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40 return new DefaultQueryExceutor() {
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41
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42 public Collection<Result> cachedResults(String query) {
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43 Cache cache = manager.getCache(CACHE_NAME);
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44 Element element = cache.get(query);
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45 if (log.isDebugEnabled()) {
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46 log.debug("found results in SQL cache: " + (element != null));
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47 }
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48 return element != null
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49 ? (Collection<Result>)element.getObjectValue()
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50 : null;
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51 }
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52
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53 public void cacheResults(String query, Collection<Result> results) {
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54 log.debug("store results in SQL cache");
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55 Cache cache = manager.getCache(CACHE_NAME);
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56 cache.put(new Element(query, results));
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57 }
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58
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59 public void clearCache(String[] tableNames) {
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60 Cache cache = manager.getCache(CACHE_NAME);
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61 Iterator keys = cache.getKeys().iterator();
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62 while (keys.hasNext()){
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63 String origKey = (String)keys.next();
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64 String key = origKey.toUpperCase();
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65 log.debug(key);
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66 for (int i = 0; i < tableNames.length; i++){
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67 if (key.contains(tableNames[i])){
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68 log.debug(tableNames[i]+ " is contained in "+key);
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69 log.debug("Cacheentry will be removed");
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70 boolean success = cache.remove(origKey);
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71 if (!success){
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72 log.warn("Object could not be reoved from Cache.");
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73 }
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74 break;
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75 }
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76 }
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77 }
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78 }
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79 };
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80 }
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81
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82 public void shutdown() {
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83 log.info("shutting down SQL cache");
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84 manager.getCache(CACHE_NAME).flush();
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85 manager.shutdown();
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86 }
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87 }
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88 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org