dom_scheduler.h | Explore in Territory

// Copyright 2019 The Chromium Authors
// 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_CORE_SCHEDULER_DOM_SCHEDULER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_SCHEDULER_DOM_SCHEDULER_H_

#include "base/memory/scoped_refptr.h"
#include "third_party/abseil-cpp/absl/types/variant.h"
#include "third_party/blink/public/common/scheduler/task_attribution_id.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_observer.h"
#include "third_party/blink/renderer/core/scheduler/dom_task_signal.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_map.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/scheduler/public/web_scheduling_priority.h"
#include "third_party/blink/renderer/platform/scheduler/public/web_scheduling_queue_type.h"
#include "third_party/blink/renderer/platform/supplementable.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"

namespace base {
class SingleThreadTaskRunner;
}  // namespace base

namespace blink {
class AbortSignal;
class DOMTaskSignal;
class ExceptionState;
class SchedulerPostTaskOptions;
class DOMSchedulerTest;
class V8SchedulerPostTaskCallback;
class WebSchedulingTaskQueue;

/*
 * DOMScheduler maintains a set of DOMTaskQueues (wrappers around
 * WebSchedulingTaskQueues) which are used to schedule tasks.
 *
 * There are two types of task queues that the scheduler maintains:
 *  1. Fixed-priority, shared task queues. The priority of these task queues
 *  never changes, which allows them to be shared by any tasks that don't
 *  require variable priority. These are postTask tasks created where one of the
 *  following are passed to postTask:
 *    a) A fixed priority
 *    b) Undefined priority and an AbortSignal or undefined signal
 *  These task queues are created when the DOMScheduler is created and destroyed
 *  when the underlying context is destroyed.
 *
 *  2. Variable-priority, per-signal task queues. The priority of these task
 *  queues can change, and is controlled by the associated TaskController. These
 *  task queues are created the first time a TaskSignal is passed to postTask,
 *  and their lifetime matches that of the associated TaskSignal.
 */
class CORE_EXPORT DOMScheduler : public ScriptWrappable,
                                 public ExecutionContextLifecycleObserver,
                                 public Supplement<ExecutionContext> { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_SCHEDULER_DOM_SCHEDULER_H_
chromium/third_party/blink/renderer/core/scheduler/dom_scheduler.h
