data_chunk_source.hpp

/*
 * Copyright (c) 2021-2022, NVIDIA CORPORATION.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#pragma once
 
#include <cudf/utilities/span.hpp>
 
#include <rmm/cuda_stream_pool.hpp>
#include <rmm/device_buffer.hpp>
 
namespace cudf {
namespace io {
namespace text {
 
class device_data_chunk {
 public:
  virtual ~device_data_chunk() = default;
  [[nodiscard]] virtual char const* data() const = 0;
  [[nodiscard]] virtual std::size_t size() const = 0;
  virtual operator device_span<char const>() const = 0;
};
 
class data_chunk_reader {
 public:
  virtual ~data_chunk_reader() = default;
  virtual void skip_bytes(std::size_t size) = 0;
 
  virtual std::unique_ptr<device_data_chunk> get_next_chunk(std::size_t size,
                                                            rmm::cuda_stream_view stream) = 0;
};
 
class data_chunk_source {
 public:
  virtual ~data_chunk_source() = default;
 
  [[nodiscard]] virtual std::unique_ptr<data_chunk_reader> create_reader() const = 0;
};
 
}  // namespace text
}  // namespace io
}  // namespace cudf