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stream_record_reader.h
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stream_record_reader.h
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/*
* Copyright 2023 Google LLC
*
* 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.
*/
#ifndef PUBLIC_DATA_LOADING_READERS_STREAM_RECORD_READER_H_
#define PUBLIC_DATA_LOADING_READERS_STREAM_RECORD_READER_H_
#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "public/data_loading/riegeli_metadata.pb.h"
namespace kv_server {
// Reader that can be used to load data from one data file.
//
// Subclasses should accept the data source through constructor and store the
// data source as its state.
//
// Not intended to be used by multiple threads.
class StreamRecordReader {
public:
virtual ~StreamRecordReader() = default;
// Returns the metadata associated with this file. Can only be called once
// before the first call to `ReadStreamRecords`.
virtual absl::StatusOr<KVFileMetadata> GetKVFileMetadata() = 0;
// Given a `data_input` stream representing a stream of string
// records, parses the records and calls `callback` once per record.
// If the callback returns a non-OK status, the function continues
// reading and logs the error at the end.
virtual absl::Status ReadStreamRecords(
const std::function<absl::Status(const std::string_view&)>& callback) = 0;
};
// Holds a stream of data.
class RecordStream {
public:
virtual ~RecordStream() = default;
virtual std::istream& Stream() = 0;
};
} // namespace kv_server
#endif // PUBLIC_DATA_LOADING_READERS_STREAM_RECORD_READER_H_