Programming Beyond Practices by Gregory T Brown

Author:Gregory T Brown
Language: eng
Format: epub
Publisher: O'Reilly Media
Published: 2016-10-20T04:00:00+00:00

Student: Make the Supplier sleep for a second before it generates a new widget?

You: That’s a good idea, but we’re working in an asynchronous programming environment. So there isn’t a direct way to tell a process to sleep. Instead, you’d set up some sort of callback to be executed after a set period of delay.

Student: OK, do that then.

You: I would, but it’s not so simple. Right now when order.submit() is called, it immediately triggers a call to supplier.produce(), which returns a Widget. The returned Widget is then pushed into the Crate. If we change supplier.produce() to use an asynchronous callback, it will no longer have a meaningful return value, breaking the whole chain.

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