@Override
public String getName() {
if (refreshAheadConfig.getName() != null) {
return refreshAheadConfig.getName();
}
return super.getName();
}
private void initSupportCache() {
// create the support cache
// make this cache clustered in the same way as the underlying cache,
this.supportConfig = new CacheConfiguration();
supportConfig.name(
underlyingCache.getName() + "_" + getClass().getName() + "_refreshAheadSupport");
supportConfig =
supportConfig.persistence(new PersistenceConfiguration().strategy(Strategy.NONE));
int activeSize =
2 * refreshAheadConfig.getBatchSize() * refreshAheadConfig.getNumberOfThreads();
supportConfig = supportConfig.maxEntriesLocalHeap(activeSize);
supportConfig = supportConfig.memoryStoreEvictionPolicy(MemoryStoreEvictionPolicy.LRU);
supportConfig = supportConfig.timeToLiveSeconds(DEFAULT_SUPPORT_TTL_SECONDS);
// TC stuff
if (underlyingCache.getCacheConfiguration().isTerracottaClustered()) {
supportConfig =
supportConfig.persistence(new PersistenceConfiguration().strategy(Strategy.DISTRIBUTED));
TerracottaConfiguration newTerracottaConfig = new TerracottaConfiguration().clustered(true);
newTerracottaConfig.consistency(Consistency.STRONG);
supportConfig.addTerracotta(newTerracottaConfig);
} else {
supportConfig.setMaxElementsOnDisk(activeSize);
}
// here we try to create the support cache.
this.supportCache = new Cache(supportConfig);
Ehcache prior = underlyingCache.getCacheManager().addCacheIfAbsent(supportCache);
if (prior != supportCache) {
throw new IllegalStateException(
"Unable to add refresh ahead support cache due to name collision: "
+ refreshAheadConfig.getName());
}
// wipe it on startup. might wobble in a clustered case, but clears out orphans.
prior.removeAll();
// catch the dispose. not sure this is the best way to do it at all.
// we could register a listener alternatively
underlyingCache.registerCacheExtension(
new CacheExtension() {
@Override
public void init() {}
@Override
public Status getStatus() {
return underlyingCache.getStatus();
}
@Override
public void dispose() throws CacheException {
RefreshAheadCache.this.localDispose();
}
@Override
public CacheExtension clone(Ehcache cache) throws CloneNotSupportedException {
throw new CloneNotSupportedException();
}
});
}
