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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/. */
use dom::bindings::cell::DOMRefCell;
use script_task::{FireTimerMsg, ScriptChan};
use script_task::{TimerSource, FromWindow, FromWorker};
use servo_util::task::spawn_named;
use js::jsapi::JS_CallFunctionValue;
use js::jsapi::{JSContext, JSObject};
use js::jsval::{JSVal, NullValue};
use js::rust::with_compartment;
use std::cell::Cell;
use std::cmp;
use std::collections::HashMap;
use std::comm::{channel, Sender};
use std::comm::Select;
use std::hash::{Hash, sip};
use std::io::timer::Timer;
use std::ptr;
use std::time::duration::Duration;
#[deriving(PartialEq, Eq)]
#[jstraceable]
pub struct TimerId(i32);
#[jstraceable]
#[privatize]
struct TimerHandle {
handle: TimerId,
data: TimerData,
cancel_chan: Option<Sender<()>>,
}
impl Hash for TimerId {
fn hash(&self, state: &mut sip::SipState) {
let TimerId(id) = *self;
id.hash(state);
}
}
impl TimerHandle {
fn cancel(&mut self) {
self.cancel_chan.as_ref().map(|chan| chan.send_opt(()).ok());
}
}
#[jstraceable]
#[privatize]
pub struct TimerManager {
active_timers: DOMRefCell<HashMap<TimerId, TimerHandle>>,
next_timer_handle: Cell<i32>,
}
#[unsafe_destructor]
impl Drop for TimerManager {
fn drop(&mut self) {
for (_, timer_handle) in self.active_timers.borrow_mut().iter_mut() {
timer_handle.cancel();
}
}
}
// Holder for the various JS values associated with setTimeout
// (ie. function value to invoke and all arguments to pass
// to the function when calling it)
#[jstraceable]
#[privatize]
struct TimerData {
is_interval: bool,
funval: JSVal,
}
impl TimerManager {
pub fn new() -> TimerManager {
TimerManager {
active_timers: DOMRefCell::new(HashMap::new()),
next_timer_handle: Cell::new(0)
}
}
pub fn set_timeout_or_interval(&self,
callback: JSVal,
timeout: i32,
is_interval: bool,
source: TimerSource,
script_chan: ScriptChan)
-> i32 {
let timeout = cmp::max(0, timeout) as u64;
let handle = self.next_timer_handle.get();
self.next_timer_handle.set(handle + 1);
// Spawn a new timer task; it will dispatch the FireTimerMsg
// to the relevant script handler that will deal with it.
let tm = Timer::new().unwrap();
let (cancel_chan, cancel_port) = channel();
let spawn_name = match source {
FromWindow(_) if is_interval => "Window:SetInterval",
FromWorker if is_interval => "Worker:SetInterval",
FromWindow(_) => "Window:SetTimeout",
FromWorker => "Worker:SetTimeout",
};
spawn_named(spawn_name, proc() {
let mut tm = tm;
let duration = Duration::milliseconds(timeout as i64);
let timeout_port = if is_interval {
tm.periodic(duration)
} else {
tm.oneshot(duration)
};
let cancel_port = cancel_port;
let select = Select::new();
let mut timeout_handle = select.handle(&timeout_port);
unsafe { timeout_handle.add() };
let mut cancel_handle = select.handle(&cancel_port);
unsafe { cancel_handle.add() };
loop {
let id = select.wait();
if id == timeout_handle.id() {
timeout_port.recv();
let ScriptChan(ref chan) = script_chan;
chan.send(FireTimerMsg(source, TimerId(handle)));
if !is_interval {
break;
}
} else if id == cancel_handle.id() {
break;
}
}
});
let timer_id = TimerId(handle);
let timer = TimerHandle {
handle: timer_id,
cancel_chan: Some(cancel_chan),
data: TimerData {
is_interval: is_interval,
funval: callback,
}
};
self.active_timers.borrow_mut().insert(timer_id, timer);
handle
}
pub fn clear_timeout_or_interval(&self, handle: i32) {
let mut timer_handle = self.active_timers.borrow_mut().remove(&TimerId(handle));
match timer_handle {
Some(ref mut handle) => handle.cancel(),
None => { }
}
}
pub fn fire_timer(&self, timer_id: TimerId, this: *mut JSObject, cx: *mut JSContext) {
let data = match self.active_timers.borrow().get(&timer_id) {
None => return,
Some(timer_handle) => timer_handle.data,
};
// TODO: Support extra arguments. This requires passing a `*JSVal` array as `argv`.
with_compartment(cx, this, || {
let mut rval = NullValue();
unsafe {
JS_CallFunctionValue(cx, this, data.funval,
0, ptr::null_mut(), &mut rval);
}
});
if !data.is_interval {
self.active_timers.borrow_mut().remove(&timer_id);
}
}
}
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