/// <summary>
/// Adds a new or update an existing <see cref="TrackingContext"/> in cache with an absolute expiration
/// of <paramref name="duration"/>.
/// </summary>
/// <param name="key">
/// The cache entry identifier, or key, at which to add the new <paramref name="trackingContext"/>.
/// </param>
/// <param name="trackingContext">
/// The <see cref="TrackingContext"/> to cache.
/// </param>
/// <param name="duration">
/// The duration, in seconds, after which the <paramref name="trackingContext"/> entry will be removed from the
/// cache.
/// </param>
public virtual void Set(string key, TrackingContext trackingContext, int duration)
{
if (key.IsNullOrEmpty())
{
throw new ArgumentNullException("key");
}
if (trackingContext.IsEmpty())
{
throw new ArgumentNullException("trackingContext");
}
if (duration < 1)
{
throw new ArgumentException("Expiration duration must be strictly positive.", "duration");
}
var cacheItem = new CacheItem(key, trackingContext);
var policy = new CacheItemPolicy {
AbsoluteExpiration = new DateTimeOffset(DateTime.UtcNow.AddSeconds(duration))
};
_cache.Set(cacheItem, policy);
}