问题
I currently program in Futures, and I'm rather curious about actors. I'd like to hear from an experienced voice:
- What are the advantages of actors over futures?
- When should I use one instead of other?
As far as I've read, actors hold state and futures doesn't, is this the only difference? So if I have true immutability I shouldn't care about actors?
Please enlighten me :-)
回答1:
One important difference is that actors typically have internal state, and therefore theoretically, they are not composable; see this and this blog post for having some issues elaborated. However, in practice, they usually provide a sweet spot between the imperative and the purely functional approach. So if possible, it is recommended to stick to programming with only futures, but if the message-passing model fits your problem domain better, feel free to use actors.
来源：https://stackoverflow.com/questions/6682848/advantages-of-actors-over-futures