public virtual Task <PlacementResult> OnAddActivation(
PlacementStrategy strategy, PlacementTarget target, IPlacementContext context)
{
var grainType = context.GetGrainTypeName(target.GrainId);
var allSilos = context.GetCompatibleSiloList(target);
return(Task.FromResult(
PlacementResult.SpecifyCreation(allSilos[random.Next(allSilos.Count)], strategy, grainType)));
}
public Task <PlacementResult> SelectSiloPowerOfK(PlacementStrategy strategy, GrainId grain, IPlacementContext context)
{
var compatibleSilos = context.GetCompatibleSiloList(grain);
// Exclude overloaded and non-compatible silos
var relevantSilos = new List <CachedLocalStat>();
foreach (CachedLocalStat current in localCache.Values)
{
if (IsSiloOverloaded(current.SiloStats))
{
continue;
}
if (!compatibleSilos.Contains(current.Address))
{
continue;
}
relevantSilos.Add(current);
}
if (relevantSilos.Count > 0)
{
int chooseFrom = Math.Min(relevantSilos.Count, chooseHowMany);
var chooseFromThoseSilos = new List <CachedLocalStat>();
while (chooseFromThoseSilos.Count < chooseFrom)
{
int index = random.Next(relevantSilos.Count);
var pickedSilo = relevantSilos[index];
relevantSilos.RemoveAt(index);
chooseFromThoseSilos.Add(pickedSilo);
}
CachedLocalStat minLoadedSilo = chooseFromThoseSilos.First();
foreach (CachedLocalStat s in chooseFromThoseSilos)
{
if (SiloLoad_ByRecentActivations(s) < SiloLoad_ByRecentActivations(minLoadedSilo))
{
minLoadedSilo = s;
}
}
return(MakePlacement(strategy, grain, context, minLoadedSilo));
}
var debugLog = string.Format("Unable to select a candidate from {0} silos: {1}", localCache.Count,
Utils.EnumerableToString(
localCache,
kvp => String.Format("SiloAddress = {0} -> {1}", kvp.Key.ToString(), kvp.Value.ToString())));
logger.Warn(ErrorCode.Placement_ActivationCountBasedDirector_NoSilos, debugLog);
throw new OrleansException(debugLog);
}
OnAddActivation(PlacementStrategy strategy, GrainId grain, IPlacementContext context)
{
// if local silo is not active or does not support this type of grain, revert to random placement
if (context.LocalSiloStatus != SiloStatus.Active || !context.GetCompatibleSiloList(grain).Contains(context.LocalSilo))
{
return(base.OnAddActivation(strategy, grain, context));
}
var grainType = context.GetGrainTypeName(grain);
return(Task.FromResult(
PlacementResult.SpecifyCreation(context.LocalSilo, strategy, grainType)));
}