public void Listen(ICacheKey cacheKey, ICacheDependency dependency, CacheItemInvalidationCallback invalidationCallback)
{
var policy = new CacheItemPolicy();
{ //configurations
var depKeys = TransformDependency(dependency)?.ToList();
if (!depKeys.IsNullOrEmpty())
{
foreach (var key in depKeys)
{
subscription.SubscribeTopic(key);
}
var monitor = new PubSubMonitor(cacheKey.GetKeyAsString(), depKeys, filter);
policy.ChangeMonitors.Add(monitor);
}
policy.SlidingExpiration = ObjectCache.NoSlidingExpiration;
policy.AbsoluteExpiration = DateTime.UtcNow.AddDays(1);
policy.Priority = System.Runtime.Caching.CacheItemPriority.NotRemovable;
policy.UpdateCallback = EncapsulateListenerCallback(cacheKey, depKeys, invalidationCallback);
}
memoryCacheInstance.Set(cacheKey.GetKeyAsString(), 0, policy);
}
private CacheEntryUpdateCallback EncapsulateListenerCallback(ICacheKey originalKey, List <string> depKeys, CacheItemInvalidationCallback invalidationCallback)
{
return((args) => {
if (args.RemovedReason == CacheEntryRemovedReason.ChangeMonitorChanged || args.RemovedReason == CacheEntryRemovedReason.Expired)
{
invalidationCallback?.Invoke();
args.UpdatedCacheItem = new CacheItem(originalKey.GetKeyAsString(), 0);
var newPolicy = new CacheItemPolicy();
{ //configurations
if (!depKeys.IsNullOrEmpty())
{
newPolicy.ChangeMonitors.Add(new PubSubMonitor(originalKey.GetKeyAsString(), depKeys, filter));
}
newPolicy.SlidingExpiration = ObjectCache.NoSlidingExpiration;
newPolicy.AbsoluteExpiration = DateTime.UtcNow.AddDays(1);
newPolicy.Priority = System.Runtime.Caching.CacheItemPriority.NotRemovable;
newPolicy.UpdateCallback = EncapsulateListenerCallback(originalKey, depKeys, invalidationCallback);
}
args.UpdatedCacheItemPolicy = newPolicy;
}
});
}