public async Task UpdateAmount(string id, int amount)
{
var @event = await CreateEvent(id, EventTypes.AmountUpdated, amount);
var amountUpdated = AmountUpdated.Create(@event, id, amount);
messageQueue.Publish(amountUpdated);
}
IMessage <object> ConstructMessage <T>(Event @event)
{
var data = @event.Data;
if (data == null)
{
throw new ArgumentNullException(nameof(@event.Data));
}
switch (data.Type)
{
case EventTypes.AmountUpdated:
var amount = data.Payload as int?;
if (amount != null)
{
return((IMessage <object>)AmountUpdated.Create(@event, data.Id, amount.Value));
}
break;
case EventTypes.ProductCreated:
if (data.Payload is Product product)
{
return((IMessage <object>)ProductCreated.Create(@event, product));
}
break;
case EventTypes.ProductDeleted:
return((IMessage <object>)ProductDeleted.Create(@event, data.Id));
case EventTypes.TitleUpdated:
var title = data.Payload as string;
return((IMessage <object>)TitleUpdated.Create(@event, data.Id, title));
default:
break;
}
throw new ArgumentException($"InvalidEvent data: {data.Id}, " +
$"{data.Type}, {data.Payload}");
}