public WebCacheInstanceFactory ExpiresAfter(TimeSpan duration)
{
if (duration != Cache.NoSlidingExpiration)
{
_expirationTime = Cache.NoAbsoluteExpiration;
_expirationBehavior = CachedItemExpirationBehavior.AfterTimeSpan;
}
_expirationDuration = duration;
return(this);
}
public WebCacheInstanceFactory ExpiresOn(DateTime absoluteExpiration)
{
if (absoluteExpiration != Cache.NoAbsoluteExpiration)
{
_expirationDuration = Cache.NoSlidingExpiration;
_expirationBehavior = CachedItemExpirationBehavior.AtScheduledDate;
}
_expirationTime = absoluteExpiration;
return(this);
}
public object ActivateInstance(IObjectAssemblySpecification registration)
{
Cache cache = HttpRuntime.Cache;
string key = registration.Key;
object instance = cache[key];
if (instance == null)
{
lock (_syncRoot)
{
instance = cache[key];
if (instance == null)
{
instance = registration.CreateInstance();
if (_expirationTime == Cache.NoAbsoluteExpiration &&
_expirationDuration == Cache.NoSlidingExpiration)
{
_expirationBehavior = CachedItemExpirationBehavior.NeverExpires;
}
switch (_expirationBehavior)
{
case CachedItemExpirationBehavior.NeverExpires:
cache.Insert(key, instance, _dependencies, Cache.NoAbsoluteExpiration,
Cache.NoSlidingExpiration, _cachePriority, _onRemoveCallback);
break;
case CachedItemExpirationBehavior.AtScheduledDate:
cache.Insert(key, instance, _dependencies, _expirationTime,
Cache.NoSlidingExpiration, _cachePriority, _onRemoveCallback);
break;
case CachedItemExpirationBehavior.AfterTimeSpan:
cache.Insert(key, instance, _dependencies, DateTime.UtcNow.Add(_expirationDuration),
Cache.NoSlidingExpiration, _cachePriority, _onRemoveCallback);
break;
case CachedItemExpirationBehavior.AfterNotUsedInTimeSpan:
cache.Insert(key, instance, _dependencies, Cache.NoAbsoluteExpiration,
_expirationDuration, _cachePriority, _onRemoveCallback);
break;
}
}
}
}
return(instance);
}
