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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 MEDIA_MIDI_MIDI_SCHEDULER_H_
#define MEDIA_MIDI_MIDI_SCHEDULER_H_
#include <stddef.h>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_checker.h"
#include "media/midi/midi_export.h"
namespace midi {
class MidiManager;
class MidiManagerClient;
// TODO(crbug.com/467442): Make tasks cancelable per client.
class MIDI_EXPORT MidiScheduler final {
public:
// Both constructor and destructor should be run on the same thread. The
// instance is bound to the TaskRunner of the constructing thread, on which
// InvokeClosure() is run.
explicit MidiScheduler(MidiManager* manager);
~MidiScheduler();
// Post |closure| to |task_runner_| safely. The |closure| will not be invoked
// after MidiScheduler is deleted. AccumulateMidiBytesSent() of |client| is
// called internally. May be called on any thread, but the user should ensure
// this method is not called on other threads during/after MidiScheduler
// destruction.
void PostSendDataTask(MidiManagerClient* client,
size_t length,
double timestamp,
const base::Closure& closure);
private:
void InvokeClosure(MidiManagerClient* client,
size_t length,
const base::Closure& closure);
// MidiManager should own the MidiScheduler and be alive longer.
MidiManager* manager_;
// The TaskRunner of the thread on which the instance is constructed.
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
// Ensures |weak_factory_| is destructed, and WeakPtrs are dereferenced on the
// same thread.
base::ThreadChecker thread_checker_;
base::WeakPtrFactory<MidiScheduler> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(MidiScheduler);
};
} // namespace midi
#endif // MEDIA_MIDI_MIDI_SCHEDULER_H_
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