I'm playing with Hazelcast 3.12 Cache implementation, and trying to configure the Eviction policy. However, I noticed that none of my cache entry listeners are being triggered when a cache eviction occurs.
My cache is defined as:
CacheSimpleConfig cacheSimpleConfig = new CacheSimpleConfig()
.setName(CACHE_NAME)
.setKeyType(String.class.getName())
.setValueType((new String[0]).getClass().getName())
.setStatisticsEnabled(true)
.setReadThrough(true)
.setWriteThrough(true)
.setInMemoryFormat(InMemoryFormat.OBJECT)
.setEvictionConfig(new EvictionConfig()
.setEvictionPolicy(EvictionPolicy.LRU)
.setSize(1000)
.setMaximumSizePolicy(EvictionConfig.MaxSizePolicy.ENTRY_COUNT))
.setExpiryPolicyFactoryConfig(
new ExpiryPolicyFactoryConfig(
new TimedExpiryPolicyFactoryConfig(ACCESSED,
new DurationConfig(
ssoSessionTimeoutInSeconds,
TimeUnit.SECONDS))));
hazelcastInstance.getConfig().addCacheConfig(cacheSimpleConfig);
ICache<String, String[]> cache = hazelcastInstance.getCacheManager().getCache(CACHE_NAME);
cache.registerCacheEntryListener(new MutableCacheEntryListenerConfiguration<>(entryListenerFactory, null, true, false));
My listener implements the 4 CacheEntry*Listener interfaces:
public class UserRolesCacheEntryListener implements CacheEntryExpiredListener<String, String[]>, CacheEntryRemovedListener<String, String[]>, CacheEntryCreatedListener<String, String[]>, CacheEntryUpdatedListener<String, String[]>, HazelcastInstanceAware {
// all 4 on*() methods delegate to: private void logEvent(CacheEntryEvent cacheEntryEvent) { String[] value = cacheEntryEvent.getValue() != null ? cacheEntryEvent.getValue() : cacheEntryEvent.getOldValue(); LOG.info("Event[{}:{}] {} => {}", cacheEntryEvent.getEventType().toString(), cacheEntryEvent.getSource().getName(), cacheEntryEvent.getKey(), value);
ICache cache = (ICache)cacheEntryEvent.getSource().unwrap(ICache.class);
LOG.debug("Cache Evictions: {} ", cache.getLocalCacheStatistics().getCacheEvictions());
}
However, I never get any of my on*() methods called when an entry is evicted. On creation of an entry, however, I do see the following entry in my log:
2019-08-13 12:27:14 INFO [hz.Hazelcast.event-1] UserRolesCacheEntryListener:70 - Event[CREATED:UserRoles] 950 => [99cedd4c-ee5b-480b-b374-eea2b919a58a, Tue Aug 13 12:27:14 EDT 2019]
2019-08-13 12:27:14 DEBUG [hz.Hazelcast.event-1] UserRolesCacheEntryListener:79 - Cache Evictions: 1
Which indicates to me that values are getting evicted from the cache, but no listener is being triggered. Is this expected behaviour? I would have thought the "onRemoved()" method/listener would have been triggered.
Additionally, is there a reason why the cache would show an eviction after 950 entries, even if it is set for 1000?
I see that Hazelcast has an eviction listener for a Map. Is there a way to use the Map's eviction listener for a cache?
