servo/components/script/task_source/networking.rs

/* 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 https://mozilla.org/MPL/2.0/. */

use msg::constellation_msg::PipelineId;

use crate::script_runtime::{CommonScriptMsg, ScriptChan, ScriptThreadEventCategory};
use crate::task::{TaskCanceller, TaskOnce};
use crate::task_source::{TaskSource, TaskSourceName};

#[derive(JSTraceable)]
pub struct NetworkingTaskSource(
    pub Box<dyn ScriptChan + Send + 'static>,
    #[no_trace] pub PipelineId,
);

impl Clone for NetworkingTaskSource {
    fn clone(&self) -> NetworkingTaskSource {
        NetworkingTaskSource(self.0.clone(), self.1)
    }
}

impl TaskSource for NetworkingTaskSource {
    const NAME: TaskSourceName = TaskSourceName::Networking;

    fn queue_with_canceller<T>(&self, task: T, canceller: &TaskCanceller) -> Result<(), ()>
    where
        T: TaskOnce + 'static,
    {
        self.0.send(CommonScriptMsg::Task(
            ScriptThreadEventCategory::NetworkEvent,
            Box::new(canceller.wrap_task(task)),
            Some(self.1),
            NetworkingTaskSource::NAME,
        ))
    }
}

impl NetworkingTaskSource {
    /// This queues a task that will not be cancelled when its associated
    /// global scope gets destroyed.
    pub fn queue_unconditionally<T>(&self, task: T) -> Result<(), ()>
    where
        T: TaskOnce + 'static,
    {
        self.0.send(CommonScriptMsg::Task(
            ScriptThreadEventCategory::NetworkEvent,
            Box::new(task),
            Some(self.1),
            NetworkingTaskSource::NAME,
        ))
    }
}