/// <summary>
/// Given a cached message, indicates whether it should be purged from the cache.
/// </summary>
/// <param name="cachedMessage">The cached message.</param>
/// <param name="newestCachedMessage">The newest cached message.</param>
/// <param name="nowUtc">The current time (UTC).</param>
/// <returns><see langword="true" /> if the message should be purged, <see langword="false" /> otherwise.</returns>
protected virtual bool ShouldPurge(ref CachedMessage cachedMessage, ref CachedMessage newestCachedMessage, DateTime nowUtc)
{
TimeSpan timeInCache = nowUtc - cachedMessage.DequeueTimeUtc;
// age of message relative to the most recent event in the cache.
TimeSpan relativeAge = newestCachedMessage.EnqueueTimeUtc - cachedMessage.EnqueueTimeUtc;
return(timePurge.ShouldPurgeFromTime(timeInCache, relativeAge));
}
