Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/CachingQueryExecutorFactory.java @ 1128:81f0a5e66d71

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Add module for FLYS artifacts geo-backend/trunk@1283 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 01 Feb 2011 17:37:09 +0000
parents ebeb56428409
children
rev   line source
1127
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.geobackend.base.query;
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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 import de.intevation.gnv.geobackend.base.query.cache.CacheCleaner;
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14
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15 import de.intevation.gnv.geobackend.config.Configuration;
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16
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17 import java.lang.management.ManagementFactory;
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18
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19 import java.util.Collection;
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20 import java.util.Iterator;
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21
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22 import javax.management.MBeanServer;
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23
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24 import net.sf.ehcache.Cache;
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25 import net.sf.ehcache.CacheManager;
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26 import net.sf.ehcache.Element;
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27
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28 import net.sf.ehcache.management.ManagementService;
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29
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30 import org.apache.log4j.Logger;
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31
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32 /**
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33 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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34 */
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35 public class CachingQueryExecutorFactory
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36 extends QueryExecutorFactory
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37 {
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38 public static final String CACHE_NAME = "sql.cache";
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39
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40 private static Logger log = Logger.getLogger(CachingQueryExecutorFactory.class);
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41
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42 protected CacheManager manager;
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43
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44 public CachingQueryExecutorFactory() {
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45 log.info("using SQL cache");
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46 init();
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47 }
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48
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49 private void init() {
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50 Configuration config = Configuration.getInstance();
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51
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52 if (config == null) {
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53 log.error("No geobackend configuration found. " +
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54 "Wasn't able to initialize cache.");
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55 return;
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56 }
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57 String configFile = config.getCacheConfiguration();
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58 manager = configFile != null
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59 ? new CacheManager(configFile)
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60 : new CacheManager();
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61 manager.addCache(CACHE_NAME);
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62 MBeanServer mBeanServer =
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63 ManagementFactory.getPlatformMBeanServer();
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64 ManagementService.registerMBeans(
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65 manager, mBeanServer, false, false, false, true);
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66 CacheCleaner cc = new CacheCleaner();
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67 cc.start();
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68 }
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69
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70 public QueryExecutor getQueryExecutor() {
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71 return new DefaultQueryExceutor() {
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72
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73 public Collection<Result> cachedResults(String query) {
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74 Cache cache = manager.getCache(CACHE_NAME);
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75 Element element = cache.get(query);
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76 if (log.isDebugEnabled()) {
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77 log.debug("found results in SQL cache: " + (element != null));
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78 }
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79 return element != null
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80 ? (Collection<Result>)element.getObjectValue()
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81 : null;
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82 }
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83
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84 public void cacheResults(String query, Collection<Result> results) {
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85 log.debug("store results in SQL cache");
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86 Cache cache = manager.getCache(CACHE_NAME);
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87 cache.put(new Element(query, results));
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88 }
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89
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90 public void clearCache(String[] tableNames) {
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91 Cache cache = manager.getCache(CACHE_NAME);
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92 Iterator keys = cache.getKeys().iterator();
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93 while (keys.hasNext()){
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94 String origKey = (String)keys.next();
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95 String key = origKey.toUpperCase();
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96 log.debug(key);
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97 for (int i = 0; i < tableNames.length; i++){
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98 if (key.contains(tableNames[i])){
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99 log.debug(tableNames[i]+ " is contained in "+key);
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100 log.debug("Cacheentry will be removed");
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101 boolean success = cache.remove(origKey);
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102 if (!success){
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103 log.warn("Object could not be reoved from Cache.");
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104 }
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105 break;
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106 }
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107 }
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108 }
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109 }
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110 };
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111 }
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113 public void shutdown() {
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114 log.info("shutting down SQL cache");
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115 manager.getCache(CACHE_NAME).flush();
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116 manager.shutdown();
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117 }
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118 }
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119 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org