1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
use stream::Stream; use executor; /// A stream combinator which converts an asynchronous stream to a **blocking /// iterator**. /// /// Created by the `Stream::wait` method, this function transforms any stream /// into a standard iterator. This is implemented by blocking the current thread /// while items on the underlying stream aren't ready yet. #[must_use = "iterators do nothing unless advanced"] #[derive(Debug)] pub struct Wait<S> { stream: executor::Spawn<S>, } impl<S> Wait<S> { /// Acquires a reference to the underlying stream that this combinator is /// pulling from. pub fn get_ref(&self) -> &S { self.stream.get_ref() } /// Acquires a mutable reference to the underlying stream that this /// combinator is pulling from. /// /// Note that care must be taken to avoid tampering with the state of the /// stream which may otherwise confuse this combinator. pub fn get_mut(&mut self) -> &mut S { self.stream.get_mut() } /// Consumes this combinator, returning the underlying stream. /// /// Note that this may discard intermediate state of this combinator, so /// care should be taken to avoid losing resources when this is called. pub fn into_inner(self) -> S { self.stream.into_inner() } } pub fn new<S: Stream>(s: S) -> Wait<S> { Wait { stream: executor::spawn(s), } } impl<S: Stream> Iterator for Wait<S> { type Item = Result<S::Item, S::Error>; fn next(&mut self) -> Option<Self::Item> { self.stream.wait_stream() } }