private PollerState FindOrCreateState(IContractsRegistry contractsRegistry, List <PollerState> pollerStates, string sourceContractName, Type handlerType)
{
var handlerContractName = contractsRegistry.GetContractName(handlerType);
PollerState state = null;
foreach (var x in pollerStates)
{
if (x.HandlerContractName != handlerContractName || x.SourceContractName != sourceContractName)
{
continue;
}
state = x;
break;
}
if (state != null)
{
return(state);
}
state = new PollerState(_pollerContractName, sourceContractName, handlerContractName);
pollerStates.Add(state);
return(state);
}
private async Task <bool> TryDispatch(PollerContext ctx, HandlerRegistrar.HandlerTypeInfo handlerInfo, EventEnvelope envelope, PollerState state)
{
var eventType = envelope.Event.GetType();
var shouldDispatch = handlerInfo.ContainsEventType(eventType);
if (shouldDispatch)
{
PreHandleEvent(envelope, handlerInfo.HandlerType);
}
using (var scope = new TransactionScope(TransactionScopeOption.RequiresNew, _transactionOptions, TransactionScopeAsyncFlowOption.Enabled))
{
if (shouldDispatch)
{
var handlerInstance = CreateHandlerInstance(handlerInfo.HandlerType);
if (handlerInstance == null)
{
throw new NullReferenceException($"Handler instance {handlerInfo.HandlerType.FullName} is null.");
}
ctx.Logger.Trace("Dispatching event {0} to {1}...", eventType.FullName, handlerInfo.HandlerType.FullName);
if (handlerInfo.IsAsync)
{
await((dynamic)handlerInstance).Handle((dynamic)envelope.Event, envelope);
}
else
{
((dynamic)handlerInstance).Handle((dynamic)envelope.Event, envelope);
}
}
state.EventSequenceId = envelope.SequenceId;
if (shouldDispatch)
{
await ctx.StateRepository.InsertOrUpdateAsync(state);
state.Clear();
ctx.Logger.Trace("Dispatched event {0} by {1} saved with sequence {2}.", eventType.FullName, handlerInfo.HandlerType.FullName, state.EventSequenceId);
}
else
{
ctx.Logger.Trace("Dispatched event {0} by {1} marked as dirty with sequence {2}.", eventType.FullName, handlerInfo.HandlerType.FullName, state.EventSequenceId);
}
scope.Complete();
}
if (shouldDispatch)
{
PostHandleEvent(envelope, handlerInfo.HandlerType);
}
return(shouldDispatch);
}
