Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/artifacts/cache/CacheFactory.java @ 1065:cf421645a2d3

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Made cache statistics available as MBeans (eg in JConsole). gnv-artifacts/trunk@1157 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 04 Jun 2010 08:47:52 +0000
parents 797a6264b89b
children f953c9a559d8
rev   line source
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1 package de.intevation.gnv.artifacts.cache;
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2
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3 import java.lang.management.ManagementFactory;
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4
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5 import javax.management.MBeanServer;
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6
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7 import net.sf.ehcache.Cache;
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8 import net.sf.ehcache.CacheManager;
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9
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10 import net.sf.ehcache.management.ManagementService;
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11
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12 import org.apache.log4j.Logger;
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13
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14 import de.intevation.gnv.geobackend.base.query.cache.CacheCleaner;
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15 import de.intevation.gnv.state.cache.ThematicDataCacheCleaner;
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16
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17 /**
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18 * The <code>CacheFactory</code> is used to initialize and retrieve Cache.
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19 *
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20 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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21 */
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22 public class CacheFactory {
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23
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24 /**
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25 * the logger, used to log exceptions and additonaly information
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26 */
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27 private static Logger log = Logger.getLogger(CacheFactory.class);
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28
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29 private final static String CACHENAME = "artifactdata";
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30
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31 /**
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32 * The singleton Instance of this Factory.
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33 */
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34 private static CacheFactory instance = null;
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35
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36 /**
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37 * The manager of the Cache
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38 */
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39 private CacheManager cacheManager = null;
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40
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41 /**
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42 * The Cleaner of the Cache
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43 */
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44 private CacheCleaner cacheCleaner = null;
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45
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46 /**
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47 * Basic-Constructor of this Class
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48 */
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49 private CacheFactory() {
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50 super();
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51 }
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52
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53 /**
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54 * This Method provides an singleton Instance of this Class.
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55 *
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56 * @return an singleton Instance of this Class
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57 */
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58 public static CacheFactory getInstance() {
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59 if (instance == null) {
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60 instance = new CacheFactory();
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61 }
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62 return instance;
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63 }
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64
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65 /**
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66 * Getting the ConnectionPool
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67 *
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68 * @return the ConnectionPool
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69 */
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70 public Cache getCache() {
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71 return this.cacheManager.getCache(CACHENAME);
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72 }
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73
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74 /**
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75 * Initializes the ConnectionPool. Should only be called once on system
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76 * startup
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77 *
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78 * @param configurationFileName
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79 */
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80 public void initializeCache(String configurationFileName) {
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81 if (cacheManager == null) {
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82 cacheManager = new CacheManager(configurationFileName);
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83 cacheManager.addCache(CACHENAME);
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84
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85 MBeanServer beanServer = ManagementFactory.getPlatformMBeanServer();
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86 ManagementService.registerMBeans(
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87 cacheManager, beanServer, false, false, false, true);
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88
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89 this.cacheCleaner = new ThematicDataCacheCleaner();
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90 this.cacheCleaner.start();
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91 }
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92 }
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94 /**
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95 * Checks if the ConnectionPool has already been initialized.
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96 *
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97 * @return true if the ConnectionPool is initialized.
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98 */
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99 public boolean isInitialized() {
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100 return this.cacheManager != null;
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101 }
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102
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103 }
http://dive4elements.wald.intevation.org