Mercurial > dive4elements > gnv-client
view geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/CachingQueryExecutorFactory.java @ 541:3cbf11c67fdc
Experimental caching of SQL results via Ehache
geo-backend/trunk@462 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Fri, 18 Dec 2009 16:13:52 +0000 |
parents | |
children | f0b6d0e2a0f6 |
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package de.intevation.gnv.geobackend.base.query; import java.util.Collection; import net.sf.ehcache.Cache; import net.sf.ehcache.Element; import net.sf.ehcache.CacheManager; import de.intevation.gnv.geobackend.base.Result; /** * @author Sascha L. Teichmann <sascha.teichmann@intevation.de> * */ public class CachingQueryExecutorFactory extends QueryExecutorFactory { public static final String QUERY_EXECUTOR_FACTORY = "caching.query.executor.config"; public static final String CACHE_NAME = "sql.cache"; protected CacheManager manager; public CachingQueryExecutorFactory() { String configFile = System.getProperty(QUERY_EXECUTOR_FACTORY); manager = configFile != null ? new CacheManager(configFile) : new CacheManager(); manager.addCache(CACHE_NAME); } public QueryExecutor getQueryExecutor() { return new DefaultQueryExceutor() { public Collection<Result> cachedResults(String query) { Cache cache = manager.getCache(CACHE_NAME); Element element = cache.get(query); return element != null ? (Collection<Result>)element.getObjectValue() : null; } public void cacheResult(String query, Collection<Result> results) { Cache cache = manager.getCache(CACHE_NAME); cache.put(new Element(query, results)); } }; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: