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[stor4nfv.git] / src / ceph / src / librbd / AsyncRequest.h

diff --git a/src/ceph/src/librbd/AsyncRequest.h b/src/ceph/src/librbd/AsyncRequest.h
new file mode 100644 (file)
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+++ b/src/ceph/src/librbd/AsyncRequest.h
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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