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Unify the task source and task canceller API

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I moved away from the `Window` struct all the logic to handle task
sources, into a new struct called `TaskManager`. In a happy world, I'd
be able to just have there two functions, of the types:

```rust
fn task_source<T: TaskSource>(&self, name: TaskSourceName) -> Box<T>
fn task_source_with_canceller<T: TaskSource>(&self, name: TaskSourceName)
  -> (Box<T>, TaskSourceCanceller)
```

And not so much duplicated code. However, because TaskSource can't be a
trait object (because it has generic type parameters), that's not
possible. Instead, I decided to reduce duplicated logic through macros.

For reasons[1], I have to pass both the name of the function with
canceller and the name of the function without, as I'm not able to
concatenate them in the macro itself. I could probably use
`concat_idents` to create both types already defined and reduce the
amount of arguments by one, but that macro is nightly only. At the same
time, not being able to declare macros inside `impl` forces me to pass
`self` as an argument.

All this makes this solution more verbose than it would be ideally. It
does reduce duplication, but it doesn't reduce the size of the file.

[1](https://github.com/rust-lang/rust/issues/29599)
This commit is contained in:
Agustin Chiappe Berrini 2018-09-24 19:31:59 -04:00
parent 14bc8ab754
commit 75eb94afca
26 changed files with 362 additions and 252 deletions
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7
components/script/dom/offlineaudiocontext.rs
View file

@ -20,7 +20,7 @@ use crate::dom::event::{Event, EventBubbles, EventCancelable};
use crate::dom::offlineaudiocompletionevent::OfflineAudioCompletionEvent;
use crate::dom::promise::Promise;
use crate::dom::window::Window;
use crate::task_source::{TaskSource, TaskSourceName};
use crate::task_source::TaskSource;
use dom_struct::dom_struct;
use servo_media::audio::context::OfflineAudioContextOptions as ServoMediaOfflineAudioContextOptions;
use std::cell::Cell;
@ -141,8 +141,9 @@ impl OfflineAudioContextMethods for OfflineAudioContext {
let this = Trusted::new(self);
let global = self.global();
let window = global.as_window();
let task_source = window.dom_manipulation_task_source();
let canceller = window.task_canceller(TaskSourceName::DOMManipulation);
let (task_source, canceller) = window
.task_manager()
.dom_manipulation_task_source_with_canceller();
Builder::new()
.name("OfflineAudioContextResolver".to_owned())
.spawn(move || {