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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
Download patch file Download diff file Expand all files Collapse all files

24
components/script/script_thread.rs
View file

@ -70,6 +70,7 @@ use crate::microtask::{Microtask, MicrotaskQueue};
use crate::script_runtime::{get_reports, new_rt_and_cx, Runtime, ScriptPort};
use crate::script_runtime::{CommonScriptMsg, ScriptChan, ScriptThreadEventCategory};
use crate::serviceworkerjob::{Job, JobQueue};
use crate::task_manager::TaskManager;
use crate::task_queue::{QueuedTask, QueuedTaskConversion, TaskQueue};
use crate::task_source::dom_manipulation::DOMManipulationTaskSource;
use crate::task_source::file_reading::FileReadingTaskSource;
@ -2583,20 +2584,23 @@ impl ScriptThread {
pipeline_id: incomplete.pipeline_id,
};
let task_manager = TaskManager::new(
self.dom_manipulation_task_source(incomplete.pipeline_id),
self.file_reading_task_source(incomplete.pipeline_id),
self.history_traversal_task_source(incomplete.pipeline_id),
self.media_element_task_source(incomplete.pipeline_id),
self.networking_task_source(incomplete.pipeline_id),
self.performance_timeline_task_source(incomplete.pipeline_id)
.clone(),
self.user_interaction_task_source(incomplete.pipeline_id),
self.remote_event_task_source(incomplete.pipeline_id),
self.websocket_task_source(incomplete.pipeline_id),
);
// Create the window and document objects.
let window = Window::new(
self.js_runtime.clone(),
MainThreadScriptChan(sender.clone()),
self.dom_manipulation_task_source(incomplete.pipeline_id),
self.media_element_task_source(incomplete.pipeline_id),
self.user_interaction_task_source(incomplete.pipeline_id),
self.networking_task_source(incomplete.pipeline_id),
self.history_traversal_task_source(incomplete.pipeline_id),
self.file_reading_task_source(incomplete.pipeline_id),
self.performance_timeline_task_source(incomplete.pipeline_id)
.clone(),
self.remote_event_task_source(incomplete.pipeline_id),
self.websocket_task_source(incomplete.pipeline_id),
task_manager,
self.image_cache_channel.clone(),
self.image_cache.clone(),
self.resource_threads.clone(),