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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
extern crate crossbeam_channel;
extern crate ipc_channel;
extern crate serde;
pub mod base_channel {
pub use crossbeam_channel::*;
}
// Needed to re-export the select macro.
pub use crossbeam_channel::*;
use ipc_channel::ipc::IpcReceiver;
use ipc_channel::router::ROUTER;
use serde::{Deserialize, Serialize};
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Arc;
pub fn route_ipc_receiver_to_new_servo_receiver<T>(ipc_receiver: IpcReceiver<T>) -> Receiver<T>
where
T: for<'de> Deserialize<'de> + Serialize + Send + 'static,
{
let (servo_sender, servo_receiver) = channel();
ROUTER.add_route(
ipc_receiver.to_opaque(),
Box::new(move |message| drop(servo_sender.send(message.to::<T>().unwrap()))),
);
servo_receiver
}
pub fn route_ipc_receiver_to_new_servo_sender<T>(
ipc_receiver: IpcReceiver<T>,
servo_sender: Sender<T>,
) where
T: for<'de> Deserialize<'de> + Serialize + Send + 'static,
{
ROUTER.add_route(
ipc_receiver.to_opaque(),
Box::new(move |message| drop(servo_sender.send(message.to::<T>().unwrap()))),
)
}
pub fn channel<T>() -> (Sender<T>, Receiver<T>) {
let (base_sender, base_receiver) = crossbeam_channel::unbounded::<T>();
let is_disconnected = Arc::new(AtomicBool::new(false));
(
Sender::new(base_sender, is_disconnected.clone()),
Receiver::new(base_receiver, is_disconnected),
)
}
#[derive(Debug, PartialEq)]
pub enum ChannelError {
ChannelClosedError,
}
pub struct Receiver<T> {
receiver: crossbeam_channel::Receiver<T>,
is_disconnected: Arc<AtomicBool>,
}
impl<T> Drop for Receiver<T> {
fn drop(&mut self) {
self.is_disconnected.store(true, Ordering::SeqCst);
}
}
impl<T> Clone for Receiver<T> {
fn clone(&self) -> Self {
Receiver {
receiver: self.receiver.clone(),
is_disconnected: self.is_disconnected.clone(),
}
}
}
impl<T> Receiver<T> {
pub fn new(
receiver: crossbeam_channel::Receiver<T>,
is_disconnected: Arc<AtomicBool>,
) -> Receiver<T> {
Receiver {
receiver,
is_disconnected,
}
}
pub fn recv(&self) -> Option<T> {
self.receiver.recv()
}
pub fn try_recv(&self) -> Option<T> {
self.receiver.try_recv()
}
pub fn len(&self) -> usize {
self.receiver.len()
}
pub fn select(&self) -> &crossbeam_channel::Receiver<T> {
&self.receiver
}
}
impl<T> Iterator for Receiver<T> {
type Item = T;
fn next(&mut self) -> Option<Self::Item> {
self.receiver.recv()
}
}
impl<'a, T> IntoIterator for &'a Receiver<T> {
type Item = T;
type IntoIter = crossbeam_channel::Receiver<T>;
fn into_iter(self) -> Self::IntoIter {
self.receiver.clone()
}
}
pub struct Sender<T> {
sender: crossbeam_channel::Sender<T>,
is_disconnected: Arc<AtomicBool>,
}
impl<T> Clone for Sender<T> {
fn clone(&self) -> Self {
Sender {
sender: self.sender.clone(),
is_disconnected: self.is_disconnected.clone(),
}
}
}
impl<T> Sender<T> {
pub fn new(
sender: crossbeam_channel::Sender<T>,
is_disconnected: Arc<AtomicBool>,
) -> Sender<T> {
Sender {
sender,
is_disconnected,
}
}
pub fn send(&self, msg: T) -> Result<(), ChannelError> {
if self.is_disconnected.load(Ordering::SeqCst) {
Err(ChannelError::ChannelClosedError)
} else {
Ok(self.sender.send(msg))
}
}
pub fn len(&self) -> usize {
self.sender.len()
}
pub fn select(&self) -> Option<&crossbeam_channel::Sender<T>> {
if self.is_disconnected.load(Ordering::SeqCst) {
None
} else {
Some(&self.sender)
}
}
}
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