Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/CachingQueryExecutorFactory.java @ 1124:f3fdbeef1c68

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Made sql-cache statistics available as MBean in JConsole. geo-backend/trunk@1156 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 04 Jun 2010 08:36:58 +0000
parents 1985d5db0feb
children ebeb56428409
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 de.intevation.gnv.geobackend.base.Result;
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4
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5 import de.intevation.gnv.geobackend.base.query.cache.CacheCleaner;
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6
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7 import de.intevation.gnv.geobackend.config.Configuration;
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8
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9 import java.lang.management.ManagementFactory;
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10
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11 import java.util.Collection;
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12 import java.util.Iterator;
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13
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14 import javax.management.MBeanServer;
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16 import net.sf.ehcache.Cache;
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17 import net.sf.ehcache.CacheManager;
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18 import net.sf.ehcache.Element;
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19
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20 import net.sf.ehcache.management.ManagementService;
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21
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22 import org.apache.log4j.Logger;
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23
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24 /**
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25 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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26 */
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27 public class CachingQueryExecutorFactory
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28 extends QueryExecutorFactory
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29 {
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30 public static final String CACHE_NAME = "sql.cache";
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31
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32 private static Logger log = Logger.getLogger(CachingQueryExecutorFactory.class);
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33
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34 protected CacheManager manager;
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35
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36 public CachingQueryExecutorFactory() {
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37 log.info("using SQL cache");
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38
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39 init();
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40 }
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41
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42 private void init() {
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43 Configuration config = Configuration.getInstance();
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44
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45 if (config == null) {
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46 log.error("No geobackend configuration found. " +
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47 "Wasn't able to initialize cache.");
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48 return;
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49 }
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50 else {
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51 String configFile = config.getCacheConfiguration();
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52 manager = configFile != null
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53 ? new CacheManager(configFile)
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54 : new CacheManager();
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55 manager.addCache(CACHE_NAME);
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56 MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
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57 ManagementService.registerMBeans(manager, mBeanServer, false, false, false, true);
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58 CacheCleaner cc = new CacheCleaner();
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59 cc.start();
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60 }
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61 }
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62
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63 public QueryExecutor getQueryExecutor() {
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64 return new DefaultQueryExceutor() {
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65
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66 public Collection<Result> cachedResults(String query) {
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67 Cache cache = manager.getCache(CACHE_NAME);
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68 Element element = cache.get(query);
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69 if (log.isDebugEnabled()) {
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70 log.debug("found results in SQL cache: " + (element != null));
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71 }
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72 return element != null
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73 ? (Collection<Result>)element.getObjectValue()
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74 : null;
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75 }
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76
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77 public void cacheResults(String query, Collection<Result> results) {
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78 log.debug("store results in SQL cache");
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79 Cache cache = manager.getCache(CACHE_NAME);
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80 cache.put(new Element(query, results));
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81 }
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82
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83 public void clearCache(String[] tableNames) {
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84 Cache cache = manager.getCache(CACHE_NAME);
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85 Iterator keys = cache.getKeys().iterator();
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86 while (keys.hasNext()){
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87 String origKey = (String)keys.next();
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88 String key = origKey.toUpperCase();
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89 log.debug(key);
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90 for (int i = 0; i < tableNames.length; i++){
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91 if (key.contains(tableNames[i])){
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92 log.debug(tableNames[i]+ " is contained in "+key);
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93 log.debug("Cacheentry will be removed");
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94 boolean success = cache.remove(origKey);
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95 if (!success){
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96 log.warn("Object could not be reoved from Cache.");
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97 }
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98 break;
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99 }
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100 }
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101 }
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102 }
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103 };
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104 }
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105
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106 public void shutdown() {
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107 log.info("shutting down SQL cache");
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108 manager.getCache(CACHE_NAME).flush();
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109 manager.shutdown();
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110 }
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111 }
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112 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org