public void CanBeReset()
{
var timesWaited = new List <TimeSpan>();
var backoffTimes = new[]
{
TimeSpan.FromSeconds(1),
TimeSpan.FromSeconds(2),
};
var helper = new BackoffHelper(backoffTimes)
{
waitAction = timesWaited.Add
};
helper.Wait();
helper.Wait();
helper.Reset();
helper.Wait();
helper.Wait();
timesWaited.Count.ShouldBe(4);
timesWaited[0].ShouldBe(TimeSpan.FromSeconds(1));
timesWaited[1].ShouldBe(TimeSpan.FromSeconds(2));
timesWaited[2].ShouldBe(TimeSpan.FromSeconds(1));
timesWaited[3].ShouldBe(TimeSpan.FromSeconds(2));
}
public void WaitsForAsLongAsTheGivenBackoffTimesSpecify()
{
var timesWaited = new List <TimeSpan>();
var backoffTimes = new []
{
TimeSpan.FromSeconds(1),
TimeSpan.FromSeconds(2),
TimeSpan.FromSeconds(3),
};
var helper = new BackoffHelper(backoffTimes)
{
waitAction = timesWaited.Add
};
helper.Wait();
helper.Wait();
helper.Wait();
timesWaited.Count.ShouldBe(3);
timesWaited[0].ShouldBe(TimeSpan.FromSeconds(1));
timesWaited[1].ShouldBe(TimeSpan.FromSeconds(2));
timesWaited[2].ShouldBe(TimeSpan.FromSeconds(3));
}
public void KeepsWaitingForAsLongAsTheLastTimeSpanSpecifies()
{
var timesWaited = new List <TimeSpan>();
var backoffTimes = new []
{
TimeSpan.FromSeconds(1),
TimeSpan.FromSeconds(2),
};
var helper = new BackoffHelper(backoffTimes)
{
waitAction = timesWaited.Add
};
helper.Wait();
helper.Wait();
helper.Wait();
helper.Wait();
helper.Wait();
timesWaited.Count.ShouldBe(5);
timesWaited[2].ShouldBe(TimeSpan.FromSeconds(2));
timesWaited[3].ShouldBe(TimeSpan.FromSeconds(2));
timesWaited[4].ShouldBe(TimeSpan.FromSeconds(2));
}
async Task DoWork()
{
using (var op = _parallelOperationsManager.TryBegin())
{
if (!op.CanContinue())
{
return;
}
using (var transactionContext = new DefaultTransactionContext())
{
AmbientTransactionContext.Current = transactionContext;
try
{
var message = await _transport.Receive(transactionContext);
if (message == null)
{
// finish the tx and wait....
await transactionContext.Complete();
await _backoffHelper.Wait();
return;
}
_backoffHelper.Reset();
var context = new IncomingStepContext(message, transactionContext);
transactionContext.Items[StepContext.StepContextKey] = context;
var stagedReceiveSteps = _pipeline.ReceivePipeline();
await _pipelineInvoker.Invoke(context, stagedReceiveSteps);
await transactionContext.Complete();
}
catch (Exception exception)
{
_log.Error(exception, "Unhandled exception in task worker");
}
finally
{
AmbientTransactionContext.Current = null;
}
}
}
}