שאלה | What is the main-difference between data-centric and message-centric middleware?

What is the main-difference between data-centric and message-centric middleware?

		When using data-centric middleware we need to write code that specifies how to send messages but when using message-centric middle we only need to write code that specifies how and when to send them.
		Data-centric middleware has better run-time than message-centric middleware.
		Data-centric middleware has lower memory consumption than message-centric middleware.
		There is not difference between them.