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// Copyright 2013 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_MEMORY_REF_COUNTED_DELETE_ON_MESSAGE_LOOP_H_
#define BASE_MEMORY_REF_COUNTED_DELETE_ON_MESSAGE_LOOP_H_
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/single_thread_task_runner.h"
namespace base {
// RefCountedDeleteOnMessageLoop is similar to RefCountedThreadSafe, and ensures
// that the object will be deleted on a specified message loop.
//
// Sample usage:
// class Foo : public RefCountedDeleteOnMessageLoop<Foo> {
//
// Foo(const scoped_refptr<SingleThreadTaskRunner>& loop)
// : RefCountedDeleteOnMessageLoop<Foo>(loop) {
// ...
// }
// ...
// private:
// friend class RefCountedDeleteOnMessageLoop<Foo>;
// friend class DeleteHelper<Foo>;
//
// ~Foo();
// };
// TODO(skyostil): Rename this to RefCountedDeleteOnTaskRunner.
template <class T>
class RefCountedDeleteOnMessageLoop : public subtle::RefCountedThreadSafeBase {
public:
// This constructor will accept a MessageL00pProxy object, but new code should
// prefer a SingleThreadTaskRunner. A SingleThreadTaskRunner for the
// MessageLoop on the current thread can be acquired by calling
// MessageLoop::current()->task_runner().
RefCountedDeleteOnMessageLoop(
const scoped_refptr<SingleThreadTaskRunner>& task_runner)
: task_runner_(task_runner) {
DCHECK(task_runner_);
}
void AddRef() const {
subtle::RefCountedThreadSafeBase::AddRef();
}
void Release() const {
if (subtle::RefCountedThreadSafeBase::Release())
DestructOnMessageLoop();
}
protected:
friend class DeleteHelper<RefCountedDeleteOnMessageLoop>;
~RefCountedDeleteOnMessageLoop() {}
void DestructOnMessageLoop() const {
const T* t = static_cast<const T*>(this);
if (task_runner_->BelongsToCurrentThread())
delete t;
else
task_runner_->DeleteSoon(FROM_HERE, t);
}
scoped_refptr<SingleThreadTaskRunner> task_runner_;
private:
DISALLOW_COPY_AND_ASSIGN(RefCountedDeleteOnMessageLoop);
};
} // namespace base
#endif // BASE_MEMORY_REF_COUNTED_DELETE_ON_MESSAGE_LOOP_H_
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