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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/. */
// XXX The spec says that the performance timeline task source should be
// a low priority task and it should be processed during idle periods.
// We are currently treating this task queue as a normal priority queue.
use dom::bindings::refcounted::Trusted;
use dom::globalscope::GlobalScope;
use script_runtime::{CommonScriptMsg, ScriptChan, ScriptThreadEventCategory};
use std::fmt;
use std::result::Result;
use task::{TaskCanceller, TaskOnce};
use task_source::TaskSource;
#[derive(JSTraceable)]
pub struct PerformanceTimelineTaskSource(pub Box<ScriptChan + Send + 'static>);
impl Clone for PerformanceTimelineTaskSource {
fn clone(&self) -> PerformanceTimelineTaskSource {
PerformanceTimelineTaskSource(self.0.clone())
}
}
impl fmt::Debug for PerformanceTimelineTaskSource {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "PerformanceTimelineTaskSource(...)")
}
}
impl TaskSource for PerformanceTimelineTaskSource {
fn queue_with_canceller<T>(
&self,
task: T,
canceller: &TaskCanceller,
) -> Result<(), ()>
where
T: TaskOnce + 'static,
{
let msg = CommonScriptMsg::Task(
ScriptThreadEventCategory::PerformanceTimelineTask,
Box::new(canceller.wrap_task(task)),
None
);
self.0.send(msg).map_err(|_| ())
}
}
impl PerformanceTimelineTaskSource {
pub fn queue_notification(&self, global: &GlobalScope) {
let owner = Trusted::new(&*global.performance());
// FIXME(nox): Why are errors silenced here?
let _ = self.queue(
task!(notify_performance_observers: move || {
owner.root().notify_observers();
}),
global,
);
}
}
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