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
//! Conversion to the `Stream` type from iterators.
use progress::Timestamp;
use Data;
use dataflow::channels::Content;
use dataflow::operators::operator::source;
use dataflow::{Stream, Scope};
/// Converts to a timely `Stream`.
pub trait ToStream<T: Timestamp, D: Data> {
/// Converts to a timely `Stream`.
///
/// #Examples
///
/// ```
/// use timely::dataflow::operators::{ToStream, Capture};
/// use timely::dataflow::operators::capture::Extract;
///
/// let (data1, data2) = timely::example(|scope| {
/// let data1 = (0..3).to_stream(scope).capture();
/// let data2 = vec![0,1,2].to_stream(scope).capture();
/// (data1, data2)
/// });
///
/// assert_eq!(data1.extract(), data2.extract());
/// ```
fn to_stream<S: Scope<Timestamp=T>>(self, scope: &mut S) -> Stream<S, D>;
}
impl<T: Timestamp, I: IntoIterator+'static> ToStream<T, I::Item> for I where I::Item: Data {
fn to_stream<S: Scope<Timestamp=T>>(self, scope: &mut S) -> Stream<S, I::Item> {
source(scope, "ToStream", |capability| {
let mut iterator = self.into_iter().fuse();
let mut capability = Some(capability);
move |output| {
if let Some(element) = iterator.next() {
let mut session = output.session(capability.as_ref().unwrap());
session.give(element);
for element in iterator.by_ref().take((256 * Content::<I::Item>::default_length()) - 1) {
session.give(element);
}
}
else {
capability = None;
}
}
})
}
}