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// Copyright 2011 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_SCHEDULER_DELAY_BASED_TIME_SOURCE_H_
#define CC_SCHEDULER_DELAY_BASED_TIME_SOURCE_H_
#include <string>
#include "base/cancelable_callback.h"
#include "base/memory/weak_ptr.h"
#include "base/values.h"
#include "cc/base/cc_export.h"
namespace base {
namespace trace_event {
class TracedValue;
}
class SingleThreadTaskRunner;
}
namespace cc {
class CC_EXPORT DelayBasedTimeSourceClient {
public:
virtual void OnTimerTick() = 0;
protected:
virtual ~DelayBasedTimeSourceClient() {}
};
// This timer implements a time source that achieves the specified interval
// in face of millisecond-precision delayed callbacks and random queueing
// delays. DelayBasedTimeSource uses base::TimeTicks::Now as its timebase.
class CC_EXPORT DelayBasedTimeSource {
public:
static scoped_ptr<DelayBasedTimeSource> Create(
base::TimeDelta interval,
base::SingleThreadTaskRunner* task_runner) {
return make_scoped_ptr(new DelayBasedTimeSource(interval, task_runner));
}
virtual ~DelayBasedTimeSource();
void SetClient(DelayBasedTimeSourceClient* client);
void SetTimebaseAndInterval(base::TimeTicks timebase,
base::TimeDelta interval);
base::TimeDelta Interval() const;
// Returns the time for the last missed tick.
base::TimeTicks SetActive(bool active);
bool Active() const;
// Get the last and next tick times. NextTickTime() returns null when
// inactive.
base::TimeTicks LastTickTime() const;
base::TimeTicks NextTickTime() const;
virtual void AsValueInto(base::trace_event::TracedValue* dict) const;
protected:
DelayBasedTimeSource(base::TimeDelta interval,
base::SingleThreadTaskRunner* task_runner);
// Virtual for testing.
virtual base::TimeTicks Now() const;
virtual std::string TypeString() const;
private:
base::TimeTicks NextTickTarget(base::TimeTicks now) const;
void PostNextTickTask(base::TimeTicks now);
void ResetTickTask(base::TimeTicks now);
void OnTimerTick();
DelayBasedTimeSourceClient* client_;
bool active_;
base::TimeTicks timebase_;
base::TimeDelta interval_;
base::TimeTicks last_tick_time_;
base::TimeTicks next_tick_time_;
base::CancelableClosure tick_closure_;
base::SingleThreadTaskRunner* task_runner_;
base::WeakPtrFactory<DelayBasedTimeSource> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(DelayBasedTimeSource);
};
} // namespace cc
#endif // CC_SCHEDULER_DELAY_BASED_TIME_SOURCE_H_
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