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// Copyright 2019 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 BASE_TASK_SINGLE_THREAD_TASK_EXECUTOR_H_
#define BASE_TASK_SINGLE_THREAD_TASK_EXECUTOR_H_
#include <memory>
#include "base/base_export.h"
#include "base/memory/scoped_refptr.h"
#include "base/message_loop/message_pump_type.h"
#include "base/single_thread_task_runner.h"
namespace base {
namespace sequence_manager {
class SequenceManager;
class TaskQueue;
} // namespace sequence_manager
// A simple single thread TaskExecutor intended for non-test usage. Tests should
// generally use TaskEnvironment or BrowserTaskEnvironment instead.
// TODO(alexclarke): Inherit from TaskExecutor to support base::Here().
class BASE_EXPORT SingleThreadTaskExecutor {
public:
explicit SingleThreadTaskExecutor(
MessagePumpType type = MessagePumpType::DEFAULT);
// Shuts down the SingleThreadTaskExecutor, after this no tasks can be
// executed and the base::TaskExecutor APIs are non-functional but won't crash
// if called.
~SingleThreadTaskExecutor();
scoped_refptr<SingleThreadTaskRunner> task_runner() const;
MessagePumpType type() const { return type_; }
private:
std::unique_ptr<sequence_manager::SequenceManager> sequence_manager_;
scoped_refptr<sequence_manager::TaskQueue> default_task_queue_;
MessagePumpType type_;
DISALLOW_COPY_AND_ASSIGN(SingleThreadTaskExecutor);
};
} // namespace base
#endif // BASE_TASK_SINGLE_THREAD_TASK_EXECUTOR_H_
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