Defining Event Handlers

Defining Event handler for Events is quite simple with Eventify. The Event Handler class needs to implement the generic IEventHandler<T> interface, where T is a given Event for which you are defining event handler.

The IEventHandler interface only contains one method Handle which takes a given Event as a parameter. And this object holds the information which has passed while publishing event.

Take a look at the following simple example, where we have defined EventHandler for CustomerRegisterEvent, that we created here.

public class CustomerRegisteredEventHandler : IEventHandler<CustomerRegisteredEvent>
{
   private ILogger<CustomerRegisteredEventHandler> _logger;

   public CustomerRegisteredEventHandler(ILogger<CustomerRegisteredEventHandler> logger)
   {
       _logger = logger;
   }

   public Task Handle(CustomerRegisteredEvent event)
   {
       _logger.Log("Customer has been registed. {customerName}", event.RegisteredCustomer.Name);
   }
}

Just to highlight, one event can have as many as an event handler, and those all get called sequentially when the given event gets published.