What are the differences between future and completion service in programming?

What are the differences between future and completion service in programming?

In programming, a 'future' represents a result that may not be available yet, while a 'completion service' is a framework for managing multiple futures and processing their results as they complete.

Can you give me an example of how each is used?

Sure! A 'future' can be used to fetch data asynchronously, while a 'completion service' can be used to submit multiple tasks and retrieve their results as they finish, improving efficiency.

Which one is better for handling multiple tasks?

A completion service is generally better for handling multiple tasks because it allows you to manage and process results from several futures concurrently.

Are there any performance considerations I should be aware of?

Yes, using a completion service can improve performance by reducing the overhead of managing multiple futures individually, but it also depends on the specific use case and workload.