internal override Task<PlacementResult> OnSelectActivation(
PlacementStrategy strategy, GrainId target, IPlacementContext context)
{
if (target.IsClient)
throw new InvalidOperationException("Cannot use StatelessWorkerStrategy to route messages to client grains.");
// If there are available (not busy with a request) activations, it returns the first one.
// If all are busy and the number of local activations reached or exceeded MaxLocal, it randomly returns one of them.
// Otherwise, it requests creation of a new activation.
List<ActivationData> local;
if (!context.LocalLookup(target, out local) || local.Count == 0)
return Task.FromResult((PlacementResult)null);
var placement = (StatelessWorkerPlacement)strategy;
foreach (var activation in local)
{
ActivationData info;
if (!context.TryGetActivationData(activation.ActivationId, out info) ||
info.State != ActivationState.Valid || !info.IsInactive) continue;
return Task.FromResult(PlacementResult.IdentifySelection(ActivationAddress.GetAddress(context.LocalSilo, target, activation.ActivationId)));
}
if (local.Count >= placement.MaxLocal)
{
var id = local[local.Count == 1 ? 0 : random.Next(local.Count)].ActivationId;
return Task.FromResult(PlacementResult.IdentifySelection(ActivationAddress.GetAddress(context.LocalSilo, target, id)));
}
return Task.FromResult((PlacementResult)null);
}
internal override Task <PlacementResult> OnSelectActivation(
PlacementStrategy strategy, GrainId target, IPlacementContext context)
{
if (target.IsClient)
{
throw new InvalidOperationException("Cannot use StatelessWorkerStrategy to route messages to client grains.");
}
// Returns an existing activation of the grain or requests creation of a new one.
// If there are available (not busy with a request) activations, it returns the first one
// that exceeds the MinAvailable limit. E.g. if MinAvailable=1, it returns the second available.
// If MinAvailable is less than 1, it returns the first available.
// If the number of local activations reached or exceeded MaxLocal, it randomly returns one of them.
// Otherwise, it requests creation of a new activation.
List <ActivationData> local;
if (!context.LocalLookup(target, out local) || local.Count == 0)
{
return(Task.FromResult((PlacementResult)null));
}
var placement = (StatelessWorkerPlacement)strategy;
List <ActivationId> available = null;
foreach (var activation in local)
{
ActivationData info;
if (!context.TryGetActivationData(activation.ActivationId, out info) ||
info.State != ActivationState.Valid || !info.IsInactive)
{
continue;
}
if (placement.MinAvailable < 1 || (available != null && available.Count >= placement.MinAvailable))
{
return(Task.FromResult(PlacementResult.IdentifySelection(ActivationAddress.GetAddress(context.LocalSilo, target, activation.ActivationId))));
}
if (available == null)
{
available = new List <ActivationId>();
}
available.Add(info.ActivationId);
}
if (local.Count >= placement.MaxLocal)
{
var id = local[local.Count == 1 ? 0 : random.Next(local.Count)].ActivationId;
return(Task.FromResult(PlacementResult.IdentifySelection(ActivationAddress.GetAddress(context.LocalSilo, target, id))));
}
return(Task.FromResult((PlacementResult)null));
}
public Task <PlacementResult> OnSelectActivation(
PlacementStrategy strategy, GrainId target, IPlacementContext context)
{
if (target.IsClient)
{
throw new InvalidOperationException("Cannot use StatelessWorkerStrategy to route messages to client grains.");
}
// If there are available (not busy with a request) activations, it returns the first one.
// If all are busy and the number of local activations reached or exceeded MaxLocal, it randomly returns one of them.
// Otherwise, it requests creation of a new activation.
List <ActivationData> local;
if (!context.LocalLookup(target, out local) || local.Count == 0)
{
return(Task.FromResult((PlacementResult)null));
}
var placement = (StatelessWorkerPlacement)strategy;
foreach (var activation in local)
{
ActivationData info;
if (!context.TryGetActivationData(activation.ActivationId, out info) ||
info.State != ActivationState.Valid || !info.IsInactive)
{
continue;
}
return(Task.FromResult(PlacementResult.IdentifySelection(ActivationAddress.GetAddress(context.LocalSilo, target, activation.ActivationId))));
}
if (local.Count >= placement.MaxLocal)
{
var id = local[local.Count == 1 ? 0 : random.Next(local.Count)].ActivationId;
return(Task.FromResult(PlacementResult.IdentifySelection(ActivationAddress.GetAddress(context.LocalSilo, target, id))));
}
return(Task.FromResult((PlacementResult)null));
}