Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/CachingQueryExecutorFactory.java @ 1122:1985d5db0feb

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Implemented a global configuration that should be used to initialize the geobackend. geo-backend/trunk@1149 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 03 Jun 2010 13:31:07 +0000
parents 02cd2935b5fa
children f3fdbeef1c68
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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11
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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 import de.intevation.gnv.geobackend.config.Configuration;
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15
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16 /**
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17 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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18 */
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19 public class CachingQueryExecutorFactory
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20 extends QueryExecutorFactory
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21 {
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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
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
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31 init();
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32 }
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33
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34 private void init() {
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35 Configuration config = Configuration.getInstance();
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36
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37 if (config == null) {
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38 log.error("No geobackend configuration found. " +
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39 "Wasn't able to initialize cache.");
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40 return;
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41 }
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42 else {
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
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43 String configFile = config.getCacheConfiguration();
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44 manager = configFile != null
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45 ? new CacheManager(configFile)
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46 : new CacheManager();
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47 manager.addCache(CACHE_NAME);
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48 CacheCleaner cc = new CacheCleaner();
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49 cc.start();
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50 }
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51 }
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52
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53 public QueryExecutor getQueryExecutor() {
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54 return new DefaultQueryExceutor() {
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55
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56 public Collection<Result> cachedResults(String query) {
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57 Cache cache = manager.getCache(CACHE_NAME);
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58 Element element = cache.get(query);
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59 if (log.isDebugEnabled()) {
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60 log.debug("found results in SQL cache: " + (element != null));
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61 }
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62 return element != null
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63 ? (Collection<Result>)element.getObjectValue()
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64 : null;
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65 }
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66
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67 public void cacheResults(String query, Collection<Result> results) {
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68 log.debug("store results in SQL cache");
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69 Cache cache = manager.getCache(CACHE_NAME);
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70 cache.put(new Element(query, results));
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71 }
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72
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73 public void clearCache(String[] tableNames) {
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74 Cache cache = manager.getCache(CACHE_NAME);
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75 Iterator keys = cache.getKeys().iterator();
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76 while (keys.hasNext()){
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77 String origKey = (String)keys.next();
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78 String key = origKey.toUpperCase();
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79 log.debug(key);
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80 for (int i = 0; i < tableNames.length; i++){
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81 if (key.contains(tableNames[i])){
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82 log.debug(tableNames[i]+ " is contained in "+key);
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83 log.debug("Cacheentry will be removed");
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84 boolean success = cache.remove(origKey);
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85 if (!success){
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86 log.warn("Object could not be reoved from Cache.");
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87 }
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88 break;
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89 }
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90 }
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91 }
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92 }
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93 };
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94 }
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96 public void shutdown() {
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97 log.info("shutting down SQL cache");
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98 manager.getCache(CACHE_NAME).flush();
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99 manager.shutdown();
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100 }
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101 }
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102 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org