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// Copyright 2014 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 CC_BASE_DELAYED_UNIQUE_NOTIFIER_H_
#define CC_BASE_DELAYED_UNIQUE_NOTIFIER_H_
#include "base/callback.h"
#include "base/memory/weak_ptr.h"
#include "cc/base/cc_export.h"
namespace base {
class SequencedTaskRunner;
} // namespace base
namespace cc {
class CC_EXPORT DelayedUniqueNotifier {
public:
// Configure this notifier to issue the |closure| notification in |delay| time
// from Schedule() call.
DelayedUniqueNotifier(base::SequencedTaskRunner* task_runner,
const base::Closure& closure,
const base::TimeDelta& delay);
// Destroying the notifier will ensure that no further notifications will
// happen from this class.
virtual ~DelayedUniqueNotifier();
// Schedule a notification to be run. If another notification is already
// pending, then it will happen in (at least) given delay from now. That is,
// if delay is 16ms and a notification has been scheduled 10ms ago (ie, it
// should trigger in no less than 6ms), then calling schedule will ensure that
// the only notification that arrives will happen in (at least) 16ms from now.
void Schedule();
// Cancel any previously scheduled runs.
void Cancel();
// Returns true if a notification is currently scheduled to run.
bool HasPendingNotification() const;
protected:
// Virtual for testing.
virtual base::TimeTicks Now() const;
private:
void NotifyIfTime();
base::SequencedTaskRunner* task_runner_;
base::Closure closure_;
base::TimeDelta delay_;
base::TimeTicks next_notification_time_;
bool notification_pending_;
base::WeakPtrFactory<DelayedUniqueNotifier> weak_ptr_factory_;
};
} // namespace cc
#endif // CC_BASE_DELAYED_UNIQUE_NOTIFIER_H_
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