Ich benutze Ehcache zum Zwischenspeichern von Objekten, die sehr teuer in meiner Anwendung geladen werden. Beim Start zwischenspeichern ich alle benötigten Objekte und sie werden einmal am Tag von einem separaten Prozess aktualisiert.Ehcache verlieren Objekte
Es scheint jedoch, dass kurz nachdem ich Objekte zum Cache hinzufügen, sie verschwinden. Nichts wird als geräumt gemeldet, aber die Objekte bleiben aus irgendeinem Grund nicht im Cache. Wenn ich ObjectLoader.loadCache laufen() ist dies die Ausgabe ich empfangen habe:
2012-09-01 17:25:37,121 [main] DEBUG ObjectLoader.getObject():65 - ************************************
2012-09-01 17:25:37,121 [main] DEBUG ObjectLoader.getObject():66 - Number of objects in cache: 0
2012-09-01 17:25:37,121 [main] DEBUG ObjectLoader.getObject():72 - Object not in cache | 501
2012-09-01 17:26:17,271 [main] DEBUG ObjectLoader.getObject():80 - Number of objects in cache: 1
2012-09-01 17:26:17,271 [main] DEBUG ObjectLoader.getObject():81 - Number of objects evicted from cache: 0
2012-09-01 17:26:17,274 [main] DEBUG ObjectLoader.getObject():83 - Object key found: 501
2012-09-01 17:26:17,274 [main] DEBUG ObjectLoader.getObject():65 - ************************************
2012-09-01 17:26:17,274 [main] DEBUG ObjectLoader.getObject():66 - Number of objects in cache: 1
2012-09-01 17:26:17,274 [main] DEBUG ObjectLoader.getObject():72 - Object not in cache | 518
2012-09-01 17:26:35,894 [main] DEBUG ObjectLoader.getObject():80 - Number of objects in cache: 1
2012-09-01 17:26:35,895 [main] DEBUG ObjectLoader.getObject():81 - Number of objects evicted from cache: 0
2012-09-01 17:26:35,895 [main] DEBUG ObjectLoader.getObject():83 - Object key found: 518
2012-09-01 17:26:35,895 [main] DEBUG ObjectLoader.getObject():65 - ************************************
2012-09-01 17:26:35,895 [main] DEBUG ObjectLoader.getObject():66 - Number of objects in cache: 1
2012-09-01 17:26:35,895 [main] DEBUG ObjectLoader.getObject():72 - Object not in cache | 516
2012-09-01 17:27:31,997 [main] DEBUG ObjectLoader.getObject():80 - Number of objects in cache: 1
2012-09-01 17:27:31,998 [main] DEBUG ObjectLoader.getObject():81 - Number of objects evicted from cache: 0
2012-09-01 17:27:31,998 [main] DEBUG ObjectLoader.getObject():83 - Object key found: 516
2012-09-01 17:27:31,998 [main] DEBUG ObjectLoader.getObject():65 - ************************************
2012-09-01 17:27:31,998 [main] DEBUG ObjectLoader.getObject():66 - Number of objects in cache: 1
2012-09-01 17:27:31,998 [main] DEBUG ObjectLoader.getObject():72 - Object not in cache | 515
2012-09-01 17:28:20,343 [main] DEBUG ObjectLoader.getObject():80 - Number of objects in cache: 1
2012-09-01 17:28:20,343 [main] DEBUG ObjectLoader.getObject():81 - Number of objects evicted from cache: 0
2012-09-01 17:28:20,344 [main] DEBUG ObjectLoader.getObject():83 - Object key found: 515
2012-09-01 17:28:20,344 [main] DEBUG ObjectLoader.getObject():65 - ************************************
2012-09-01 17:28:20,344 [main] DEBUG ObjectLoader.getObject():66 - Number of objects in cache: 1
2012-09-01 17:28:20,344 [main] DEBUG ObjectLoader.getObject():72 - Object not in cache | 525
2012-09-01 17:29:05,616 [main] DEBUG ObjectLoader.getObject():80 - Number of objects in cache: 1
2012-09-01 17:29:05,617 [main] DEBUG ObjectLoader.getObject():81 - Number of objects evicted from cache: 0
2012-09-01 17:29:05,617 [main] DEBUG ObjectLoader.getObject():83 - Object key found: 525
2012-09-01 17:29:05,617 [main] DEBUG ObjectLoader.getObject():65 - ************************************
2012-09-01 17:29:05,617 [main] DEBUG ObjectLoader.getObject():66 - Number of objects in cache: 1
2012-09-01 17:29:05,618 [main] DEBUG ObjectLoader.getObject():72 - Object not in cache | 512
2012-09-01 17:29:38,790 [main] DEBUG ObjectLoader.getObject():80 - Number of objects in cache: 1
2012-09-01 17:29:38,790 [main] DEBUG ObjectLoader.getObject():81 - Number of objects evicted from cache: 0
2012-09-01 17:29:38,790 [main] DEBUG ObjectLoader.getObject():83 - Object key found: 512
habe ich ehcache falsch konfiguriert oder habe ich einen Fehler in meinem Code? Jede Hilfe wäre willkommen. Vielen Dank.
Ich bin mit Feder 3.1.0, ehcache-Feder-Anmerkungen 1.1.2 und ehcache 2.4.2
ObjectCacheFacade.java
@Component()
public class ObjectCacheFacade {
private static final String CACHE_KEY = "myObjectCache";
@Resource
private CacheManager cacheManager;
private Cache cache;
public ObjectCacheFacade() {
cacheManager = CacheManager.getInstance();
this.cache = cacheManager.getCache(CACHE_KEY);
}
public Object getObjectFromCache(String objectId) {
Object result = null;
Element element = cache.get(objectId);
if (element != null && element.getValue() != null) {
result = element.getObjectValue();
}
return result;
}
public void putObjectIntoCache(String objectId, Object object) {
Element element = new Element(objectId, object);
cache.put(element);
}
public int getSize() {
return cache.getSize();
}
public void removeObjectFromCache(String objectId) {
cache.remove(objectId);
}
public void flushCache() {
cache.removeAll();
}
public Cache getCache() {
return cache;
}
}
ObjectLoader.java
@Service
public class ObjectLoader {
private static final Logger log = Logger.getLogger(ObjectLoader.class);
@Resource
protected ObjectDao objectDao;
@Resource
protected ObjectCacheFacade objectCache;
public void loadCache() {
List<String> objectIds = objectDao.getObjectIds();
for (String objectId : objectIds) {
loadObject(objectId);
}
}
public Object getObject(String objectId) {
log.debug("************************************");
log.debug("Number of objects in cache: " + objectCache.getSize());
Object object = objectCache.getObjectFromCache(objectId);
if (object == null) {
log.debug("Object not in cache | " + objectId);
object = objectDao.getObject(objectId);
if (object != null) {
objectCache.putObjectIntoCache(objectId, object);
log.debug("Number of objects in cache: " + objectCache.getSize());
log.debug("Number of objects evicted from cache: " + objectCache.getCache().getCacheEventNotificationService().getElementsEvictedCounter());
for (Object key : objectCache.getCache().getKeys()) {
log.debug("Object key found: " + key);
}
}
}
return object;
}
}
ehcache.xml
<ehcache>
<diskStore path="java.io.tmpdir"/>
<defaultCache
maxElementsInMemory="1000"
eternal="false"
timeToIdleSeconds="60"
timeToLiveSeconds="300"
overflowToDisk="false"
memoryStoreEvictionPolicy="LRU"
/>
<cache
name="myObjectCache"
maxElementsInMemory="1000"
eternal="true"
timeToIdleSeconds="0"
timeToLiveSeconds="0"
overflowToDisk="false"
diskPersistent="true"
memoryStoreEvictionPolicy="LRU"
/>
</ehcache>
applicationContext.xml
<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean" />
Ich vermute, dass Sie overflowToDisk = "true" wollen. Wenn Sie EHCache 2.6 oder höher verwenden, sollten Sie stattdessen verwenden. Werfen Sie einen Blick auf http://ehcache.org/documentation/configuration/fast-restart –
GreyBeardedGeek