/// <summary>
/// This generate customer billing through "Producer Consumer" pattern, with parallelization.
/// The maximum number of threads is equivalent to processors count (default), but can be customized in appsettings.json
/// The amount of days to calculate the due date from today is also customized.
/// </summary>
protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
var blockingCollection = new BlockingCollection <string>(_customerBillingGeneratorSettings.BoundedCapacityForBlockingCollection.Value);
Action <string> billCalculatingWork = cpf =>
{
double value = Double.Parse($"{cpf.Substring(0,2)}{cpf.Substring(cpf.Length-2, 2)}");
_billingApiService.Add(new Bill()
{
DueDate = DateTime.Now.AddDays(_customerBillingGeneratorSettings.AmountOfDaysToDueDate.Value),
PersonId = cpf, Value = value
});
};
_ = Task.Run(async() =>
{
IEnumerable <string> customerIds = await _customerApiService.GetAllIdsAsync();
foreach (string id in customerIds.ToList())
{
blockingCollection.Add(id);
}
blockingCollection.CompleteAdding();
});
blockingCollection
.GetConsumingEnumerable()
.AsParallel()
.WithDegreeOfParallelism(_customerBillingGeneratorSettings.MaxNumberOfConcurrentTasks.Value)
.WithMergeOptions(ParallelMergeOptions.NotBuffered)
.ForAll(billCalculatingWork);
await Task.CompletedTask;
}