Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/CachingQueryExecutorFactory.java @ 541:3cbf11c67fdc

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Experimental caching of SQL results via Ehache geo-backend/trunk@462 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 18 Dec 2009 16:13:52 +0000
parents
children f0b6d0e2a0f6
rev   line source
541
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
1 package de.intevation.gnv.geobackend.base.query;
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
2
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
3 import java.util.Collection;
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
4
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
5 import net.sf.ehcache.Cache;
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
6 import net.sf.ehcache.Element;
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
7 import net.sf.ehcache.CacheManager;
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
8
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
9
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
10 import de.intevation.gnv.geobackend.base.Result;
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
11
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
12 /**
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
13 * @author Sascha L. Teichmann <sascha.teichmann@intevation.de>
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
14 *
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
15 */
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
16 public class CachingQueryExecutorFactory
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
17 extends QueryExecutorFactory
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
18 {
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
19 public static final String QUERY_EXECUTOR_FACTORY = "caching.query.executor.config";
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
20 public static final String CACHE_NAME = "sql.cache";
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
21
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
22 protected CacheManager manager;
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
23
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
24 public CachingQueryExecutorFactory() {
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
25 String configFile = System.getProperty(QUERY_EXECUTOR_FACTORY);
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
26 manager = configFile != null
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
27 ? new CacheManager(configFile)
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
28 : new CacheManager();
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
29 manager.addCache(CACHE_NAME);
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
30 }
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
31
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
32 public QueryExecutor getQueryExecutor() {
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
33 return new DefaultQueryExceutor() {
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
34
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
35 public Collection<Result> cachedResults(String query) {
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
36 Cache cache = manager.getCache(CACHE_NAME);
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
37 Element element = cache.get(query);
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
38 return element != null
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
39 ? (Collection<Result>)element.getObjectValue()
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
40 : null;
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
41 }
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
42
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
43 public void cacheResult(String query, Collection<Result> results) {
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
44 Cache cache = manager.getCache(CACHE_NAME);
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
45 cache.put(new Element(query, results));
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
46 }
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
47 };
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
48 }
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
49 }
3cbf11c67fdc Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
50 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org