Mercurial > dive4elements > gnv-client
annotate 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 |
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children | f0b6d0e2a0f6 |
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Experimental caching of SQL results via Ehache
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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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 |
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10 import de.intevation.gnv.geobackend.base.Result; |
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11 |
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12 /** |
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13 * @author Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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14 * |
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15 */ |
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16 public class CachingQueryExecutorFactory |
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17 extends QueryExecutorFactory |
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18 { |
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19 public static final String QUERY_EXECUTOR_FACTORY = "caching.query.executor.config"; |
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20 public static final String CACHE_NAME = "sql.cache"; |
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21 |
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22 protected CacheManager manager; |
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23 |
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24 public CachingQueryExecutorFactory() { |
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25 String configFile = System.getProperty(QUERY_EXECUTOR_FACTORY); |
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26 manager = configFile != null |
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27 ? new CacheManager(configFile) |
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28 : new CacheManager(); |
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29 manager.addCache(CACHE_NAME); |
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30 } |
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31 |
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32 public QueryExecutor getQueryExecutor() { |
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33 return new DefaultQueryExceutor() { |
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34 |
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35 public Collection<Result> cachedResults(String query) { |
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36 Cache cache = manager.getCache(CACHE_NAME); |
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37 Element element = cache.get(query); |
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38 return element != null |
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39 ? (Collection<Result>)element.getObjectValue() |
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40 : null; |
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41 } |
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42 |
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43 public void cacheResult(String query, Collection<Result> results) { |
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44 Cache cache = manager.getCache(CACHE_NAME); |
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45 cache.put(new Element(query, results)); |
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46 } |
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47 }; |
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48 } |
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49 } |
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50 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |