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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_SCHEDULER_DOM_SCHEDULER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_SCHEDULER_DOM_SCHEDULER_H_
#include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_observer.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/scheduler/public/web_scheduling_priority.h"
#include "third_party/blink/renderer/platform/supplementable.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
namespace blink {
class DOMTask;
class DOMTaskSignal;
class ExceptionState;
class SchedulerPostTaskOptions;
class ScriptValue;
class V8Function;
class WebSchedulingTaskQueue;
class MODULES_EXPORT DOMScheduler : public ScriptWrappable,
public ExecutionContextLifecycleObserver,
public Supplement<LocalDOMWindow> {
DEFINE_WRAPPERTYPEINFO();
USING_GARBAGE_COLLECTED_MIXIN(DOMScheduler);
public:
static const char kSupplementName[];
static DOMScheduler* From(LocalDOMWindow&);
explicit DOMScheduler(LocalDOMWindow*);
// postTask creates and queues a DOMTask and returns a Promise that will
// resolve when it completes. The task will be scheduled in the queue
// corresponding to the priority in the SchedulerPostTaskOptions, or in a
// queue associated with the given DOMTaskSignal if one is provided. If the
// underlying context is destroyed, e.g. for detached windows, this will
// return a rejected promise.
ScriptPromise postTask(ScriptState*,
V8Function*,
SchedulerPostTaskOptions*,
const HeapVector<ScriptValue>& args,
ExceptionState&);
// Returns a TaskSignal representing the state when the current task was
// scheduled. If postTask is given a signal but no priority, it will return
// that signal. If postTask is given both a signal and a priority, it will
// return a signal with the given priority that follows the given signal.
// If a priority only was given, it will return a signal with the given
// priority that neither follows another signal nor is known to a controller,
// and is therefore unmodifiable. If called outside of a postTask task, it
// will return a task signal at the default priority (user-visible).
// NOTE: This uses V8's ContinuationPreservedEmbedderData to propagate the
// currentTaskSignal across microtask boundaries, so it will remain usable
// even in then() blocks or after an await in an async function.
DOMTaskSignal* currentTaskSignal(ScriptState*) const;
base::SingleThreadTaskRunner* GetTaskRunnerFor(WebSchedulingPriority);
void ContextDestroyed() override;
void Trace(Visitor*) override;
private:
static constexpr size_t kWebSchedulingPriorityCount =
static_cast<size_t>(WebSchedulingPriority::kLastPriority) + 1;
void CreateGlobalTaskQueues(LocalDOMWindow*);
// |global_task_queues_| is initialized with one entry per priority, indexed
// by priority. This will be empty when the window is detached.
Vector<std::unique_ptr<WebSchedulingTaskQueue>, kWebSchedulingPriorityCount>
global_task_queues_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_SCHEDULER_DOM_SCHEDULER_H_
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