public void Concurrent_read_only_access_to_aggregate_history_can_occur_in_paralell()
{
var user = new User();
user.Register("*****@*****.**", "password", Guid.NewGuid());
using (var session = OpenSession(CreateStore()))
{
session.Save(user);
}
var iterations = 20;
var delayEachTransactionByMilliseconds = 100;
Action readUserHistory = () =>
{
using (var session = OpenSession(CreateStore()))
{
using (var transaction = new TransactionScope())
{
((IEventStoreReader)session).GetHistory(user.Id);
Thread.Sleep(TimeSpanExtensions.Milliseconds(delayEachTransactionByMilliseconds));
transaction.Complete();
}
}
};
readUserHistory();//one warmup to get consistent times later.
var timeForSingleTransactionalRead = (int)StopwatchExtensions.TimeExecution(readUserHistory).TotalMilliseconds;
var timingsSummary = TimeAsserter.ExecuteThreaded(
readUserHistory,
iterations: iterations,
timeIndividualExecutions: true,
maxTotal: ((iterations * timeForSingleTransactionalRead) / 2).Milliseconds(),
description: $"If access is serialized the time will be approximately {iterations * timeForSingleTransactionalRead} milliseconds. If parelellized it should be far below this value.");
timingsSummary.Average.Should().BeLessThan(delayEachTransactionByMilliseconds.Milliseconds());
timingsSummary.IndividualExecutionTimes.Sum().Should().BeGreaterThan(timingsSummary.Total);
}
public static StopwatchExtensions.TimedExecutionSummary Execute
(Action action,
int iterations = 1,
TimeSpan?maxAverage = null,
TimeSpan?maxTotal = null,
string description = "",
string timeFormat = DefaultTimeFormat,
int maxTries = 3)
{
maxAverage = maxAverage != default(TimeSpan) ? maxAverage : TimeSpan.MaxValue;
maxTotal = maxTotal != default(TimeSpan) ? maxTotal : TimeSpan.MaxValue;
Func <TimeSpan?, string> format = date => date?.ToString(timeFormat) ?? "";
StopwatchExtensions.TimedExecutionSummary executionSummary = null;
for (int tries = 1; tries <= maxTries; tries++)
{
executionSummary = StopwatchExtensions.TimeExecution(action: action, iterations: iterations);
try
{
RunAsserts(maxAverage, maxTotal, executionSummary, format);
}
catch (Exception e)
{
Debug.WriteLine($"Try: {tries} {e.GetType().FullName}: {e.Message}");
if (tries >= maxTries)
{
PrintSummary(iterations, maxAverage, maxTotal, description, format, executionSummary);
throw;
}
continue;
}
PrintSummary(iterations, maxAverage, maxTotal, description, format, executionSummary);
break;
}
return(executionSummary);
}