// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:nil -*-
// vim: ts=8 sw=2 sts=2 expandtab

#ifndef CEPH_LIBRBD_IO_OBJECT_DISPATCH_INTERFACE_H
#define CEPH_LIBRBD_IO_OBJECT_DISPATCH_INTERFACE_H

#include "include/int_types.h"
#include "include/buffer.h"
#include "include/rados/librados.hpp"
#include "common/zipkin_trace.h"
#include "librbd/Types.h"
#include "librbd/io/Types.h"

struct Context;
struct RWLock;

namespace librbd {
namespace io {

struct AioCompletion;
struct ObjectDispatchInterface;
struct ObjectDispatchSpec;

struct ObjectDispatchInterface {
  typedef ObjectDispatchInterface Dispatch;
  typedef ObjectDispatchLayer DispatchLayer;
  typedef ObjectDispatchSpec DispatchSpec;

  virtual ~ObjectDispatchInterface() {
  }

  virtual ObjectDispatchLayer get_dispatch_layer() const = 0;

  virtual void shut_down(Context* on_finish) = 0;

  virtual bool read(
      uint64_t object_no, ReadExtents* extents, IOContext io_context,
      int op_flags, int read_flags, const ZTracer::Trace &parent_trace,
      uint64_t* version, int* object_dispatch_flags,
      DispatchResult* dispatch_result, Context** on_finish,
      Context* on_dispatched) = 0;

  virtual bool discard(
      uint64_t object_no, uint64_t object_off, uint64_t object_len,
      IOContext io_context, int discard_flags,
      const ZTracer::Trace &parent_trace, int* object_dispatch_flags,
      uint64_t* journal_tid, DispatchResult* dispatch_result,
      Context**on_finish, Context* on_dispatched) = 0;

  virtual bool write(
      uint64_t object_no, uint64_t object_off, ceph::bufferlist&& data,
      IOContext io_context, int op_flags, int write_flags,
      std::optional<uint64_t> assert_version,
      const ZTracer::Trace &parent_trace, int* object_dispatch_flags,
      uint64_t* journal_tid, DispatchResult* dispatch_result,
      Context**on_finish, Context* on_dispatched) = 0;

  virtual bool write_same(
      uint64_t object_no, uint64_t object_off, uint64_t object_len,
      LightweightBufferExtents&& buffer_extents, ceph::bufferlist&& data,
      IOContext io_context, int op_flags, const ZTracer::Trace &parent_trace,
      int* object_dispatch_flags, uint64_t* journal_tid,
      DispatchResult* dispatch_result, Context**on_finish,
      Context* on_dispatched) = 0;

  virtual bool compare_and_write(
      uint64_t object_no, uint64_t object_off, ceph::bufferlist&& cmp_data,
      ceph::bufferlist&& write_data, IOContext io_context, int op_flags,
      const ZTracer::Trace &parent_trace, uint64_t* mismatch_offset,
      int* object_dispatch_flags, uint64_t* journal_tid,
      DispatchResult* dispatch_result, Context** on_finish,
      Context* on_dispatched) = 0;

  virtual bool flush(
      FlushSource flush_source, const ZTracer::Trace &parent_trace,
      uint64_t* journal_tid, DispatchResult* dispatch_result,
      Context** on_finish, Context* on_dispatched) = 0;

  virtual bool list_snaps(
      uint64_t object_no, Extents&& extents, SnapIds&& snap_ids,
      int list_snap_flags, const ZTracer::Trace &parent_trace,
      SnapshotDelta* snapshot_delta, int* object_dispatch_flags,
      DispatchResult* dispatch_result, Context** on_finish,
      Context* on_dispatched) = 0;

  virtual bool invalidate_cache(Context* on_finish) = 0;
  virtual bool reset_existence_cache(Context* on_finish) = 0;

  virtual void extent_overwritten(
      uint64_t object_no, uint64_t object_off, uint64_t object_len,
      uint64_t journal_tid, uint64_t new_journal_tid) = 0;

  virtual int prepare_copyup(
      uint64_t object_no,
      SnapshotSparseBufferlist* snapshot_sparse_bufferlist) = 0;

};

} // namespace io
} // namespace librbd

#endif // CEPH_LIBRBD_IO_OBJECT_DISPATCH_INTERFACE_H
