/// <summary>
/// Calculates the hybrid checksum, this is used to
/// create rate for every specific object in the cache
/// based on various object attributes.
/// <remarks>
/// The calculate done like this: HybridChecksum((c.HitRatio + ((c.ObjectSize / 1024) + (c.Span.Ticks / 1024) + (c.UsageDatetime.Ticks / 1024))));
/// </remarks>
/// </summary>
/// <param name="c">an object of type <see cref="Cleanup"/></param>
/// <param name="currentConfiguration">The current configuration.</param>
/// <returns>a rate as <see cref="long"/></returns>
public static long CalculateHybridChecksum(Cleanup c, Enums.ServiceCacheCleanUp currentConfiguration)
{
#region Access Log
#if TRACE
{
Handler.LogHandler.Tracking("Access Method: " + typeof(CacheCleanup).FullName + "->" + ((object)MethodBase.GetCurrentMethod()).ToString() + " ;");
}
#endif
#endregion Access Log
// do not make Hybrid calculations on other cleanup strategy - boost performance
if (currentConfiguration == Enums.ServiceCacheCleanUp.HYBRID)
{
return(HybridChecksum((c.HitRatio + ((c.ObjectSize / 1024) + (c.Span.Ticks / 1024) + (c.UsageDatetime.Ticks / 1024)))));
}
return(0);
}
/// <summary>
/// Updates the specified msg or its updating the available record if its already added.
/// </summary>
/// <param name="msg">The MSG.</param>
public void Update(IndexusMessage msg)
{
#region Access Log
#if TRACE
{
Handler.LogHandler.Tracking("Access Method: " + this.GetType().ToString() + "->" + ((object)MethodBase.GetCurrentMethod()).ToString() + " ;");
}
#endif
#endregion Access Log
lock (BulkObject)
{
Cleanup c;
if (this.CleanupDict.ContainsKey(msg.Key))
{
c = this.CleanupDict[msg.Key];
// update
if (msg.Payload != null)
{
c.ObjectSize = msg.Payload.Length == 1 ? c.ObjectSize : msg.Payload.Length;
}
else
{
c.ObjectSize = 0;
}
c.Prio = msg.ItemPriority;
c.HitRatio += 1;
c.HybridPoint = CalculateHybridChecksum(c, this.CleanupCacheConfiguration);
c.Span = msg.Expires.Subtract(DateTime.Now);
c.UsageDatetime = DateTime.Now;
}
else
{
// add
// object is not available, create a new instance / calculations / and add it to the list.
var cleanup = new Cleanup(msg.Key, msg.ItemPriority, msg.Expires.Subtract(DateTime.Now), 0, DateTime.Now, msg.Payload != null ? msg.Payload.Length : 0, 0);
cleanup.HybridPoint = CalculateHybridChecksum(cleanup, this.CleanupCacheConfiguration);
this.CleanupDict[msg.Key] = cleanup;
}
}
}
