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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
/*!
Higher level communication abstractions.
*/
use core::comm::{GenericChan, GenericSmartChan, GenericPort};
use core::comm::{Chan, Port, Selectable, Peekable};
use core::pipes;
use core::prelude::*;
/// An extension of `pipes::stream` that allows both sending and receiving.
pub struct DuplexStream<T, U> {
priv chan: Chan<T>,
priv port: Port<U>,
}
// Allow these methods to be used without import:
pub impl<T:Owned,U:Owned> DuplexStream<T, U> {
fn send(&self, x: T) {
self.chan.send(x)
}
fn try_send(&self, x: T) -> bool {
self.chan.try_send(x)
}
fn recv(&self, ) -> U {
self.port.recv()
}
fn try_recv(&self) -> Option<U> {
self.port.try_recv()
}
fn peek(&self) -> bool {
self.port.peek()
}
}
impl<T:Owned,U:Owned> GenericChan<T> for DuplexStream<T, U> {
fn send(&self, x: T) {
self.chan.send(x)
}
}
impl<T:Owned,U:Owned> GenericSmartChan<T> for DuplexStream<T, U> {
fn try_send(&self, x: T) -> bool {
self.chan.try_send(x)
}
}
impl<T:Owned,U:Owned> GenericPort<U> for DuplexStream<T, U> {
fn recv(&self) -> U {
self.port.recv()
}
fn try_recv(&self) -> Option<U> {
self.port.try_recv()
}
}
impl<T:Owned,U:Owned> Peekable<U> for DuplexStream<T, U> {
fn peek(&self) -> bool {
self.port.peek()
}
}
impl<T:Owned,U:Owned> Selectable for DuplexStream<T, U> {
fn header(&self) -> *pipes::PacketHeader {
self.port.header()
}
}
/// Creates a bidirectional stream.
pub fn DuplexStream<T:Owned,U:Owned>()
-> (DuplexStream<T, U>, DuplexStream<U, T>)
{
let (p1, c2) = comm::stream();
let (p2, c1) = comm::stream();
(DuplexStream {
chan: c1,
port: p1
},
DuplexStream {
chan: c2,
port: p2
})
}
#[cfg(test)]
mod test {
use comm::DuplexStream;
#[test]
pub fn DuplexStream1() {
let (left, right) = DuplexStream();
left.send(~"abc");
right.send(123);
assert!(left.recv() == 123);
assert!(right.recv() == ~"abc");
}
}
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