fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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86 lines
3.3 KiB
86 lines
3.3 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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// Copyright (c) 2013 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#pragma once
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#include <cassert>
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#include <map>
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#include <memory>
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#include <string>
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#include <vector>
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#include "rocksdb/status.h"
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namespace ROCKSDB_NAMESPACE {
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// FileChecksumFunc is the function class to generates the checksum value
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// for each file when the file is written to the file system.
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class FileChecksumFunc {
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public:
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virtual ~FileChecksumFunc() {}
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// Return the checksum of concat (A, data[0,n-1]) where init_checksum is the
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// returned value of some string A. It is used to maintain the checksum of a
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// stream of data
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virtual std::string Extend(const std::string& init_checksum, const char* data,
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size_t n) = 0;
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// Return the checksum value of data[0,n-1]
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virtual std::string Value(const char* data, size_t n) = 0;
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// Return a processed value of the checksum for store in somewhere
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virtual std::string ProcessChecksum(const std::string& checksum) = 0;
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// Returns a name that identifies the current file checksum function.
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virtual const char* Name() const = 0;
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};
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// FileChecksumList stores the checksum information of a list of files (e.g.,
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// SST files). The FileChecksumLIst can be used to store the checksum
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// information of all SST file getting from the MANIFEST, which are
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// the checksum information of all valid SST file of a DB instance. It can
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// also be used to store the checksum information of a list of SST files to
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// be ingested.
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class FileChecksumList {
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public:
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virtual ~FileChecksumList() {}
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// Clean the previously stored file checksum information.
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virtual void reset() = 0;
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// Get the number of checksums in the checksum list
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virtual size_t size() const = 0;
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// Return all the file checksum information being stored in a unordered_map.
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// File_number is the key, the first part of the value is checksum value,
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// and the second part of the value is checksum function name.
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virtual Status GetAllFileChecksums(
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std::vector<uint64_t>* file_numbers, std::vector<std::string>* checksums,
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std::vector<std::string>* checksum_func_names) = 0;
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// Given the file_number, it searches if the file checksum information is
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// stored.
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virtual Status SearchOneFileChecksum(uint64_t file_number,
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std::string* checksum,
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std::string* checksum_func_name) = 0;
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// Insert the checksum information of one file to the FileChecksumList.
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virtual Status InsertOneFileChecksum(
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uint64_t file_number, const std::string& checksum,
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const std::string& checksum_func_name) = 0;
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// Remove the checksum information of one SST file.
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virtual Status RemoveOneFileChecksum(uint64_t file_number) = 0;
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};
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// Create a new file checksum list.
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extern FileChecksumList* NewFileChecksumList();
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// Create a Crc32c based file checksum function
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extern FileChecksumFunc* CreateFileChecksumFuncCrc32c();
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} // namespace ROCKSDB_NAMESPACE
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