public async Task ExecuteAsync(EnsurePoolSize command, CancellationToken cancellationToken)
{
var vacantInstanceTarget = await repository.GetVacantInstanceTargetAsync(cancellationToken);
var vacantInstanceCount = await repository.GetVacantInstanceCountAsync(cancellationToken);
var vacantInstanceDeficit = vacantInstanceTarget - vacantInstanceCount;
telemetryClient.GetMetric("pools.vacant.count").TrackValue(vacantInstanceCount);
telemetryClient.GetMetric("pools.vacant.target").TrackValue(vacantInstanceTarget);
telemetryClient.GetMetric("pools.vacant.deficit").TrackValue(vacantInstanceDeficit);
if (vacantInstanceDeficit == 0)
{
return;
}
while (vacantInstanceDeficit > 0)
{
var allocationBlockSize = await repository.GetAllocationBlockSizeAsync(cancellationToken);
telemetryClient.GetMetric("pools.vacant.block.size").TrackValue(vacantInstanceTarget);
using (telemetryClient.TrackMetricTimer("pools.vacant.grow.block.time"))
{
Task[] addTasks = new Task[Math.Min(allocationBlockSize, vacantInstanceDeficit)];
for (var i = 0; i < addTasks.Length; i++)
{
addTasks[i] = addVacantInstance.ExecuteAsync(new PushVacantInstance(), cancellationToken);
vacantInstanceDeficit--;
}
await Task.WhenAll(addTasks);
}
}
}
