public void when_executed_with_few_handlers_it_should_execute_them_in_parallel()
{
// TODO: On AppVeyor this test is blinking. I thing because of shared resources. This test shouldn't use time.
var container = new Container();
container.Options.DefaultScopedLifestyle = new AsyncScopedLifestyle();
container.AddLogging(_testOutput);
var strategy = new ParallelHandlersExecutionStrategy(container.GetInstance <ILogger <ParallelHandlersExecutionStrategy> >());
var handlers = VentureContextTools.CreateHandlerDescriptors(
new DelayedMessageHandler(TimeSpan.FromMilliseconds(value: 100)),
new DelayedMessageHandler(TimeSpan.FromMilliseconds(value: 100)),
new DelayedMessageHandler(TimeSpan.FromMilliseconds(value: 100)),
new DelayedMessageHandler(TimeSpan.FromMilliseconds(value: 100)),
new DelayedMessageHandler(TimeSpan.FromMilliseconds(value: 100)),
new DelayedMessageHandler(TimeSpan.FromMilliseconds(value: 100))).ToArray();
var message = new Message02();
var context = VentureContextTools.CreateFilledVentureContext(message);
Func <Task> sut = () => strategy.ExecuteHandlers(
handlers,
message,
context);
var singleHandlerExecutionTime = TimeSpan.FromMilliseconds(value: 100);
sut.ExecutionTime().Should()
.BeCloseTo(
singleHandlerExecutionTime,
TimeSpan.FromMilliseconds(value: 50),
"should run simultaneously");
}
public void when_executed_with_failing_handler_it_should_throw()
{
var handlers = VentureContextTools.CreateHandlerDescriptors(
new MessageHandler(),
new ThrowingHandler(),
new ThrowingHandler()).ToArray();
var message = new Message02();
var context = VentureContextTools.CreateFilledVentureContext(message);
var strategy = new ParallelHandlersExecutionStrategy(NullLogger <ParallelHandlersExecutionStrategy> .Instance);
Func <Task> sut = () => strategy.ExecuteHandlers(
handlers,
message,
context);
sut.Should().ThrowExactly <AggregateException>()
.Where(exception => exception.InnerExceptions.Count == 2, "two handlers did throw an exception");
}
public void when_executed_without_handlers_it_should_throw()
{
var container = new Container();
container.Options.DefaultScopedLifestyle = new AsyncScopedLifestyle();
container.AddLogging(_testOutput);
var strategy = new ParallelHandlersExecutionStrategy(container.GetInstance <ILogger <ParallelHandlersExecutionStrategy> >());
var message = new Message02();
var context = VentureContextTools.CreateFilledVentureContext(message);
// ReSharper disable once AssignNullToNotNullAttribute - it's a test against null.
Func <Task> sut = () => strategy.ExecuteHandlers(
handlers: null,
message,
context);
sut.Should().Throw <ArgumentNullException>().Where(exception => exception.ParamName.Equals("handlers"));
}
public async Task when_executed_with_few_handlers_it_should_execute_all_of_them()
{
var handler1 = new MessageHandler();
var handler2 = new MessageHandler();
var handler3 = new MessageHandler();
var handlers = VentureContextTools.CreateHandlerDescriptors(
handler1,
handler2,
handler3).ToArray();
var message = new Message02();
var context = VentureContextTools.CreateFilledVentureContext(message);
var sut = new ParallelHandlersExecutionStrategy(NullLogger <ParallelHandlersExecutionStrategy> .Instance);
await sut.ExecuteHandlers(
handlers,
message,
context);
handler1.IsExecuted.Should().BeTrue("handler #1 should be called");
handler2.IsExecuted.Should().BeTrue("handler #2 should be called");
handler3.IsExecuted.Should().BeTrue("handler #3 should be called");
}
public void when_executed_with_handlers_it_should_log_execution_progress()
{
var container = new Container();
container.Options.DefaultScopedLifestyle = new AsyncScopedLifestyle();
container.AddLogging(_testOutput);
var handlers = VentureContextTools.CreateHandlerDescriptors(
new MessageHandler(),
new ThrowingHandler(),
new ThrowingHandler()).ToArray();
var message = new Message02();
var context = VentureContextTools.CreateFilledVentureContext(message);
var strategy = new ParallelHandlersExecutionStrategy(container.GetInstance <ILogger <ParallelHandlersExecutionStrategy> >());
Func <Task> sut = () => strategy.ExecuteHandlers(
handlers,
message,
context);
sut.Should().ThrowExactly <AggregateException>();
InMemorySink.Instance.LogEvents
.Where(log => log.Level == LogEventLevel.Debug)
.Select(log => log.RenderMessage())
.Count(log => log.StartsWith("Executing a message handler of type"))
.Should().Be(handlers.Length, "for each handler should be logged its start");
InMemorySink.Instance.LogEvents
.Where(log => log.Level == LogEventLevel.Debug)
.Select(log => log.RenderMessage())
.Count(log => log.StartsWith("Executed a message handler of type"))
.Should().Be(handlers.Length, "for each handler should be logged its finish");
InMemorySink.Instance.LogEvents
.Where(log => log.Level == LogEventLevel.Error)
.Select(log => log.RenderMessage())
.Count(log => log.StartsWith("An error occurred during a message handler execution of type"))
.Should().Be(expected: 2, "for each failed handler should be logged an error");
}