public static MessageHandlerDecoratorChainBuilder StartingWith(IMessageHandlerDecorator smh)
{
var b = new MessageHandlerDecoratorChainBuilder();
b.Add(smh);
return(b);
}
public Action <SubscriberIdAndMessage, IServiceProvider> Decorate(MessageHandler messageHandler)
{
MessageHandlerDecoratorChainBuilder builder = MessageHandlerDecoratorChainBuilder.StartingWith(_decorators[0]);
foreach (IMessageHandlerDecorator mhd in _decorators.Skip(1))
{
builder = builder.AndThen(mhd);
}
IMessageHandlerDecoratorChain chain = builder.AndFinally((smh, serviceProvider) => {
String subscriberId = smh.SubscriberId;
IMessage message = smh.Message;
try {
_logger.LogTrace($"Invoking handler {subscriberId} {message.Id}");
messageHandler(smh.Message, serviceProvider);
_logger.LogTrace($"handled message {subscriberId} {message.Id}");
} catch (Exception e) {
_logger.LogTrace($"Got exception {subscriberId} {message.Id}: {e}");
throw;
}
});
return((subscriberIdAndMessage, serviceProvider) => chain.InvokeNext(subscriberIdAndMessage, serviceProvider));
}
