// Given a purge cached message, indicates whether it should be purged from the cache
private bool ShouldPurge(ref CachedEventHubMessage cachedMessage, ref CachedEventHubMessage 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.ShouldPurgFromTime(timeInCache, relativeAge));
}
/// <summary>
/// Given a purge request, indicates if a cached message should be purged from the cache
/// </summary>
/// <param name="cachedMessage"></param>
/// <param name="newestCachedMessage"></param>
/// <param name="purgeRequest"></param>
/// <param name="nowUtc"></param>
/// <returns></returns>
public bool ShouldPurge(ref CachedEventHubMessage cachedMessage, ref CachedEventHubMessage newestCachedMessage, IDisposable purgeRequest, DateTime nowUtc)
{
// if we're purging our current buffer, don't use it any more
var purgedResource = (FixedSizeBuffer)purgeRequest;
if (currentBuffer != null && currentBuffer.Id == purgedResource.Id)
{
currentBuffer = null;
}
TimeSpan timeInCache = nowUtc - cachedMessage.DequeueTimeUtc;
// age of message relative to the most recent event in the cache.
TimeSpan relativeAge = newestCachedMessage.EnqueueTimeUtc - cachedMessage.EnqueueTimeUtc;
return(ShouldPurgeFromResource(ref cachedMessage, purgedResource) || timePurage.ShouldPurgFromTime(timeInCache, relativeAge));
}