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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_LIBRBD_ASYNC_REQUEST_H
#define CEPH_LIBRBD_ASYNC_REQUEST_H
#include "include/Context.h"
#include "include/rados/librados.hpp"
#include "include/xlist.h"
#include "include/compat.h"
namespace librbd {
class ImageCtx;
template <typename ImageCtxT = ImageCtx>
class AsyncRequest
{
public:
AsyncRequest(ImageCtxT &image_ctx, Context *on_finish);
virtual ~AsyncRequest();
void complete(int r) {
if (should_complete(r)) {
r = filter_return_code(r);
finish_and_destroy(r);
}
}
virtual void send() = 0;
inline bool is_canceled() const {
return m_canceled;
}
inline void cancel() {
m_canceled = true;
}
protected:
ImageCtxT &m_image_ctx;
librados::AioCompletion *create_callback_completion();
Context *create_callback_context();
Context *create_async_callback_context();
void async_complete(int r);
virtual bool should_complete(int r) = 0;
virtual int filter_return_code(int r) const {
return r;
}
// NOTE: temporary until converted to new state machine format
virtual void finish_and_destroy(int r) {
finish(r);
delete this;
}
virtual void finish(int r) {
finish_request();
m_on_finish->complete(r);
}
private:
Context *m_on_finish;
bool m_canceled;
typename xlist<AsyncRequest<ImageCtxT> *>::item m_xlist_item;
void start_request();
void finish_request();
};
} // namespace librbd
extern template class librbd::AsyncRequest<librbd::ImageCtx>;
#endif //CEPH_LIBRBD_ASYNC_REQUEST_H
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