/// <summary>
/// Registers a message handler if one doesn't exist for the given message type, otherwise
/// overwrites the previously registered handler for that message type.
/// </summary>
/// <param name="messageType">The message type to set the handler for.</param>
/// <param name="messageHandler">The message handler.</param>
/// <returns></returns>
public MessageHandlerCollectionBuilder SetHandler(string messageType, HandlerAsyncDelegate messageHandler)
{
if (messageType == null)
{
throw new ArgumentNullException(nameof(messageType));
}
this.MessageHandlerCollection[messageType] = messageHandler ?? throw new ArgumentNullException(nameof(messageHandler));
return(this);
}
/// <summary>
/// Sets the default handler to use when a message has a type which has no registered handlers.
/// </summary>
/// <param name="messageHandler">The default handler implementation.</param>
public MessageHandlerCollectionBuilder SetDefaultHandler(HandlerAsyncDelegate messageHandler)
{
this.MessageHandlerCollection.FallbackMessageHandler = messageHandler ?? throw new ArgumentNullException(nameof(messageHandler));
return(this);
}