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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_BASE_QUEUED_TASK_POSTER_H_
#define REMOTING_BASE_QUEUED_TASK_POSTER_H_
#include "base/containers/queue.h"
#include "base/functional/callback.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/task/single_thread_task_runner.h"
namespace remoting {
// This is a helper class ensuring tasks posted to |target_task_runner| inside
// the same task slot will be queued up and executed together after current
// task is done on |source_task_runner|. This can prevent unrelated tasks to
// be scheduled on |target_task_runner| in between the task sequence.
// This class can be created on any thread but must be used and deleted on the
// thread of |source_task_runner|.
class QueuedTaskPoster {
public:
QueuedTaskPoster(
scoped_refptr<base::SingleThreadTaskRunner> target_task_runner);
QueuedTaskPoster(const QueuedTaskPoster&) = delete;
QueuedTaskPoster& operator=(const QueuedTaskPoster&) = delete;
~QueuedTaskPoster();
void AddTask(base::OnceClosure closure);
private:
void TransferTaskQueue();
scoped_refptr<base::SingleThreadTaskRunner> source_task_runner_;
scoped_refptr<base::SingleThreadTaskRunner> target_task_runner_;
base::queue<base::OnceClosure> task_queue_;
bool transfer_task_scheduled_ = false;
base::WeakPtrFactory<QueuedTaskPoster> weak_factory_{this};
};
} // namespace remoting
#endif // REMOTING_BASE_QUEUED_TASK_POSTER_H_
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