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
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
extern crate futures;
extern crate glib_itc;
extern crate gtk;
extern crate tokio_core;
use std::collections::VecDeque;
use std::io::Error;
use std::sync::{Arc, Mutex};
use std::sync::mpsc::channel;
use std::thread;
use futures::{Async, Poll, Stream};
use futures::task::{self, Task};
use glib_itc::Sender;
use tokio_core::reactor;
pub use tokio_core::reactor::{Handle, Remote};
pub struct Core { }
impl Core {
pub fn run() -> Remote {
let (sender, receiver) = channel();
thread::spawn(move || {
let mut core = reactor::Core::new().unwrap();
sender.send(core.remote()).unwrap();
loop {
core.turn(None);
}
});
receiver.recv().unwrap()
}
}
struct _EventStream<MSG> {
events: VecDeque<MSG>,
observers: Vec<Box<Fn(MSG) + Send>>,
sender: Arc<Mutex<Sender>>,
task: Option<Task>,
terminated: bool,
ui_events: VecDeque<MSG>,
}
#[derive(Clone)]
pub struct EventStream<MSG> {
stream: Arc<Mutex<_EventStream<MSG>>>,
}
impl<MSG> EventStream<MSG> {
pub fn new(sender: Arc<Mutex<Sender>>) -> Self {
EventStream {
stream: Arc::new(Mutex::new(_EventStream {
events: VecDeque::new(),
observers: vec![],
sender: sender,
task: None,
terminated: false,
ui_events: VecDeque::new(),
})),
}
}
pub fn close(&self) -> Result<(), Error> {
let mut stream = self.stream.lock().unwrap();
stream.sender.lock().unwrap().close()?;
stream.terminated = true;
if let Some(ref task) = stream.task {
task.unpark();
}
Ok(())
}
pub fn emit(&self, event: MSG)
where MSG: Clone + 'static
{
let mut stream = self.stream.lock().unwrap();
if let Some(ref task) = stream.task {
task.unpark();
}
stream.events.push_back(event.clone());
for observer in &stream.observers {
observer(event.clone());
}
}
fn get_event(&self) -> Option<MSG> {
self.stream.lock().unwrap().events.pop_front()
}
fn is_terminated(&self) -> bool {
let stream = self.stream.lock().unwrap();
stream.terminated
}
pub fn observe<CALLBACK: Fn(MSG) + Send + 'static>(&self, callback: CALLBACK) {
self.stream.lock().unwrap().observers.push(Box::new(callback));
}
pub fn pop_ui_events(&self) -> Option<MSG> {
self.stream.lock().unwrap().ui_events.pop_front()
}
}
impl<MSG: Clone + 'static> Stream for EventStream<MSG> {
type Item = MSG;
type Error = ();
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
if self.is_terminated() {
Ok(Async::Ready(None))
}
else {
match self.get_event() {
Some(event) => {
let mut stream = self.stream.lock().unwrap();
stream.task = None;
stream.ui_events.push_back(event.clone());
stream.sender.lock().unwrap().send();
Ok(Async::Ready(Some(event)))
},
None => {
let mut stream = self.stream.lock().unwrap();
stream.task = Some(task::park());
Ok(Async::NotReady)
},
}
}
}
}