Performance Timeline API

1 files changed, 58 insertions, 0 deletions

diff --git a/components/script/task_source/performance_timeline.rs b/components/script/task_source/performance_timeline.rs
new file mode 100644
index 00000000000..272d971737d
--- /dev/null
+++ b/components/script/task_source/performance_timeline.rs
@@ -0,0 +1,58 @@
+/* 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::inheritance::Castable;
+use dom::bindings::refcounted::Trusted;
+use dom::performance::{NotifyPerformanceObserverRunnable, Performance};
+use dom::window::Window;
+use script_thread::{MainThreadScriptMsg, Runnable, RunnableWrapper, ScriptThread};
+use std::fmt;
+use std::result::Result;
+use std::sync::mpsc::Sender;
+use task_source::TaskSource;
+
+#[derive(JSTraceable, Clone)]
+pub struct PerformanceTimelineTaskSource(pub Sender<MainThreadScriptMsg>);
+
+impl fmt::Debug for PerformanceTimelineTaskSource {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "PerformanceTimelineTaskSource(...)")
+    }
+}
+
+impl TaskSource for PerformanceTimelineTaskSource {
+    fn queue_with_wrapper<T>(&self,
+                             msg: Box<T>,
+                             wrapper: &RunnableWrapper) -> Result<(), ()>
+                             where T: Runnable + Send + 'static {
+        let msg = PerformanceTimelineTask(wrapper.wrap_runnable(msg));
+        self.0.send(MainThreadScriptMsg::PerformanceTimeline(msg)).map_err(|_| ())
+    }
+}
+
+impl PerformanceTimelineTaskSource {
+    pub fn queue_notification(&self, owner: &Performance, window: &Window) {
+        let owner = Trusted::new(owner);
+        let runnable = box NotifyPerformanceObserverRunnable::new(owner);
+        let _ = self.queue(runnable, window.upcast());
+    }
+}
+
+pub struct PerformanceTimelineTask(pub Box<Runnable + Send>);
+
+impl fmt::Debug for PerformanceTimelineTask {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "PerformanceTimelineTask(...)")
+    }
+}
+
+impl PerformanceTimelineTask {
+    pub fn handle_task(self, script_thread: &ScriptThread) {
+        self.0.main_thread_handler(script_thread);
+    }
+}