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// Copyright (c) 2012 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 REMOTING_BASE_STOPPABLE_H_
#define REMOTING_BASE_STOPPABLE_H_
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/memory/ref_counted.h"
namespace base {
class SingleThreadTaskRunner;
} // namespace base
namespace remoting {
// A helper base class that implements asynchronous shutdown on a specific
// thread.
class Stoppable {
public:
// Constructs an object and stores the callback to be posted to |task_runner|
// once the object has been shutdown completely.
Stoppable(scoped_refptr<base::SingleThreadTaskRunner> task_runner,
const base::Closure& stopped_callback);
virtual ~Stoppable();
// Initiates shutdown. It can be called by both the owner of the object and
// the object itself resulting in the same shutdown sequence.
void Stop();
protected:
// Called by derived classes to notify about shutdown completion. Posts
// the completion task on |task_runner_| message loop.
void CompleteStopping();
// Derived classes have to override this method to implement the shutdown
// logic.
virtual void DoStop() = 0;
enum State {
kRunning,
kStopping,
kStopped
};
State stoppable_state() const { return state_; }
private:
State state_;
// A callback to be called when shutdown is completed.
base::Closure stopped_callback_;
// The target task runner where the shutdown notification will be posted.
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
DISALLOW_COPY_AND_ASSIGN(Stoppable);
};
} // namespace remoting
#endif // REMOTING_BASE_STOPPABLE_H_
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