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// Copyright 2015 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_CORE_FRAME_DOM_TIMER_COORDINATOR_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_DOM_TIMER_COORDINATOR_H_
#include <memory>
#include "base/macros.h"
#include "base/single_thread_task_runner.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
namespace blink {
class DOMTimer;
class ExecutionContext;
class ScheduledAction;
// Maintains a set of DOMTimers for a given page or
// worker. DOMTimerCoordinator assigns IDs to timers; these IDs are
// the ones returned to web authors from setTimeout or setInterval. It
// also tracks recursive creation or iterative scheduling of timers,
// which is used as a signal for throttling repetitive timers.
class DOMTimerCoordinator {
DISALLOW_NEW();
public:
DOMTimerCoordinator() = default;
// Creates and installs a new timer. Returns the assigned ID.
int InstallNewTimeout(ExecutionContext*,
ScheduledAction*,
base::TimeDelta timeout,
bool single_shot);
// Removes and disposes the timer with the specified ID, if any. This may
// destroy the timer.
DOMTimer* RemoveTimeoutByID(int id);
// Timers created during the execution of other timers, and
// repeating timers, are throttled. Timer nesting level tracks the
// number of linked timers or repetitions of a timer. See
// https://html.spec.whatwg.org/C/#timers
int TimerNestingLevel() { return timer_nesting_level_; }
// Sets the timer nesting level. Set when a timer executes so that
// any timers created while the timer is executing will incur a
// deeper timer nesting level, see DOMTimer::DOMTimer.
void SetTimerNestingLevel(int level) { timer_nesting_level_ = level; }
void Trace(Visitor*); // Oilpan.
private:
int NextID();
using TimeoutMap = HeapHashMap<int, Member<DOMTimer>>;
TimeoutMap timers_;
int circular_sequential_id_ = 0;
int timer_nesting_level_ = 0;
DISALLOW_COPY_AND_ASSIGN(DOMTimerCoordinator);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_DOM_TIMER_COORDINATOR_H_
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