async Task <Try <IEnumerable <Task> > > TryStartFilter <TClientMessage, TConnectRequest, TResponse, TFilterDefinition>(
IReverseCallDispatcher <TClientMessage, FilterRuntimeToClientMessage, TConnectRequest, FilterRegistrationResponse, FilterEventRequest, TResponse> dispatcher,
StreamProcessor streamProcessor,
ScopeId scopeId,
TFilterDefinition filterDefinition,
Func <TenantId, IFilterProcessor <TFilterDefinition> > getFilterProcessor,
CancellationToken cancellationToken)
where TClientMessage : IMessage, new()
where TConnectRequest : class
where TResponse : class
where TFilterDefinition : IFilterDefinition
{
_logger.StartingFilter(filterDefinition.TargetStream);
try
{
var runningDispatcher = dispatcher.Accept(new FilterRegistrationResponse(), cancellationToken);
await streamProcessor.Initialize().ConfigureAwait(false);
await ValidateFilter(
scopeId,
filterDefinition,
getFilterProcessor,
cancellationToken).ConfigureAwait(false);
return(new[] { streamProcessor.Start(), runningDispatcher });
}
catch (Exception ex)
{
if (!cancellationToken.IsCancellationRequested)
{
_logger.ErrorWhileStartingFilter(ex, filterDefinition.TargetStream, scopeId);
}
return(ex);
}
}
async Task <Try <IEnumerable <Task> > > TryStartEventHandler <TClientMessage, TConnectRequest, TResponse, TFilterDefinition>(
IReverseCallDispatcher <TClientMessage, EventHandlerRuntimeToClientMessage, TConnectRequest, EventHandlerRegistrationResponse, HandleEventRequest, TResponse> dispatcher,
StreamProcessor filterStreamProcessor,
StreamProcessor eventProcessorStreamProcessor,
ScopeId scopeId,
TFilterDefinition filterDefinition,
Func <IFilterProcessor <TFilterDefinition> > getFilterProcessor,
CancellationToken cancellationToken)
where TClientMessage : IMessage, new()
where TConnectRequest : class
where TResponse : class
where TFilterDefinition : IFilterDefinition
{
_logger.Debug("Starting Event Handler '{EventHandlerId}'", filterDefinition.TargetStream);
try
{
var runningDispatcher = dispatcher.Accept(new EventHandlerRegistrationResponse(), cancellationToken);
await filterStreamProcessor.Initialize().ConfigureAwait(false);
await eventProcessorStreamProcessor.Initialize().ConfigureAwait(false);
await ValidateFilter(
scopeId,
filterDefinition,
getFilterProcessor,
cancellationToken).ConfigureAwait(false);
return(new[] { filterStreamProcessor.Start(), eventProcessorStreamProcessor.Start(), runningDispatcher });
}
catch (Exception ex)
{
if (!cancellationToken.IsCancellationRequested)
{
_logger.Warning(
ex,
"Error occurred while trying to start Event Handler '{EventHandlerId}'",
filterDefinition.TargetStream);
}
return(ex);
}
}
/// <summary>
/// Starts the event horizon.
/// </summary>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
public async Task Start()
{
try
{
var tasks = new TaskGroup(
_dispatcher.Accept(new SubscriptionResponse {
ConsentId = Consent.ToProtobuf()
}, _cancellationTokenSource.Token),
ProcessEventsThroughEventHorizon());
tasks.OnFirstTaskFailure += (_, ex) => Log.ErrorOccurredInEventHorizon(
_logger,
ex,
Id.ConsumerMicroservice,
Id.ConsumerTenant,
Id.ProducerTenant,
Id.Partition,
Id.PublicStream);;
tasks.OnAllTasksCompleted += () => Log.EventHorizonStopped(
_logger,
Id.ConsumerMicroservice,
Id.ConsumerTenant,
Id.ProducerTenant,
Id.Partition,
Id.PublicStream);
await tasks.WaitForAllCancellingOnFirst(_cancellationTokenSource).ConfigureAwait(false);
}
finally
{
Log.EventHorizonDisconnecting(
_logger,
Id.ConsumerMicroservice,
Id.ConsumerTenant,
Id.ProducerTenant,
Id.Partition,
Id.PublicStream);
}
}