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99 lines
3.3 KiB
Rust
99 lines
3.3 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Tracking of pending loads in a document.
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//! https://html.spec.whatwg.org/multipage/#the-end
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use msg::constellation_msg::PipelineId;
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use net_traits::AsyncResponseTarget;
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use net_traits::{PendingAsyncLoad, ResourceTask};
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use std::sync::Arc;
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use url::Url;
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#[derive(JSTraceable, PartialEq, Clone, Debug, HeapSizeOf)]
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pub enum LoadType {
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Image(Url),
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Script(Url),
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Subframe(Url),
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Stylesheet(Url),
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PageSource(Url),
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}
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impl LoadType {
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fn url(&self) -> &Url {
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match *self {
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LoadType::Image(ref url) |
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LoadType::Script(ref url) |
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LoadType::Subframe(ref url) |
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LoadType::Stylesheet(ref url) |
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LoadType::PageSource(ref url) => url,
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}
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}
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}
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#[derive(JSTraceable, HeapSizeOf)]
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pub struct DocumentLoader {
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/// We use an `Arc<ResourceTask>` here in order to avoid file descriptor exhaustion when there
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/// are lots of iframes.
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#[ignore_heap_size_of = "channels are hard"]
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pub resource_task: Arc<ResourceTask>,
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pipeline: Option<PipelineId>,
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blocking_loads: Vec<LoadType>,
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events_inhibited: bool,
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}
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impl DocumentLoader {
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pub fn new(existing: &DocumentLoader) -> DocumentLoader {
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DocumentLoader::new_with_task(existing.resource_task.clone(), None, None)
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}
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/// We use an `Arc<ResourceTask>` here in order to avoid file descriptor exhaustion when there
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/// are lots of iframes.
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pub fn new_with_task(resource_task: Arc<ResourceTask>,
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pipeline: Option<PipelineId>,
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initial_load: Option<Url>)
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-> DocumentLoader {
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let initial_loads = initial_load.into_iter().map(LoadType::PageSource).collect();
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DocumentLoader {
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resource_task: resource_task,
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pipeline: pipeline,
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blocking_loads: initial_loads,
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events_inhibited: false,
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}
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}
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/// Create a new pending network request, which can be initiated at some point in
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/// the future.
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pub fn prepare_async_load(&mut self, load: LoadType) -> PendingAsyncLoad {
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let url = load.url().clone();
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self.blocking_loads.push(load);
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PendingAsyncLoad::new((*self.resource_task).clone(), url, self.pipeline)
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}
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/// Create and initiate a new network request.
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pub fn load_async(&mut self, load: LoadType, listener: AsyncResponseTarget) {
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let pending = self.prepare_async_load(load);
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pending.load_async(listener)
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}
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/// Mark an in-progress network request complete.
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pub fn finish_load(&mut self, load: LoadType) {
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let idx = self.blocking_loads.iter().position(|unfinished| *unfinished == load);
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self.blocking_loads.remove(idx.expect(&format!("unknown completed load {:?}", load)));
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}
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pub fn is_blocked(&self) -> bool {
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// TODO: Ensure that we report blocked if parsing is still ongoing.
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!self.blocking_loads.is_empty()
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}
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pub fn inhibit_events(&mut self) {
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self.events_inhibited = true;
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}
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pub fn events_inhibited(&self) -> bool {
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self.events_inhibited
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}
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}
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