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annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/CachingQueryExecutorFactory.java @ 542:f0b6d0e2a0f6

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Small fixes for Ehcache based SQL results caching. geo-backend/trunk@463 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sat, 19 Dec 2009 14:45:21 +0000
parents 3cbf11c67fdc
children 8b442223741c
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
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5 import net.sf.ehcache.Cache;
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6 import net.sf.ehcache.Element;
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7 import net.sf.ehcache.CacheManager;
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8
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9 import org.apache.log4j.Logger;
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10
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11 import de.intevation.gnv.geobackend.base.Result;
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12
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13 /**
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14 * @author Sascha L. Teichmann <sascha.teichmann@intevation.de>
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15 *
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16 */
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17 public class CachingQueryExecutorFactory
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18 extends QueryExecutorFactory
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19 {
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20 public static final String QUERY_EXECUTOR_FACTORY = "caching.query.executor.config";
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21 public static final String CACHE_NAME = "sql.cache";
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22
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23 private static Logger log = Logger.getLogger(CachingQueryExecutorFactory.class);
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24
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25 protected CacheManager manager;
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26
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27 public CachingQueryExecutorFactory() {
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28 log.info("using SQL cache");
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29 String configFile = System.getProperty(QUERY_EXECUTOR_FACTORY);
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30 manager = configFile != null
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31 ? new CacheManager(configFile)
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32 : new CacheManager();
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33 manager.addCache(CACHE_NAME);
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34 }
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35
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36 public QueryExecutor getQueryExecutor() {
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37 return new DefaultQueryExceutor() {
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38
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39 public Collection<Result> cachedResults(String query) {
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40 Cache cache = manager.getCache(CACHE_NAME);
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41 Element element = cache.get(query);
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42 if (log.isDebugEnabled()) {
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43 log.debug("found results in SQL cache: " + (element != null));
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44 }
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45 return element != null
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46 ? (Collection<Result>)element.getObjectValue()
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47 : null;
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48 }
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49
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50 public void cacheResults(String query, Collection<Result> results) {
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51 log.debug("store results in SQL cache");
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52 Cache cache = manager.getCache(CACHE_NAME);
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53 cache.put(new Element(query, results));
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54 }
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55 };
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56 }
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57
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58 public void shutdown() {
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59 log.info("shutting down SQL cache");
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60 manager.getCache(CACHE_NAME).flush();
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61 manager.shutdown();
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62 }
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63 }
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64 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
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