mirror of https://github.com/facebook/rocksdb.git
88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
// 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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#ifndef ROCKSDB_LITE
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#include "rocksdb/sst_file_reader.h"
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#include "db/db_iter.h"
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#include "db/dbformat.h"
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#include "options/cf_options.h"
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#include "table/get_context.h"
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#include "table/table_builder.h"
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#include "table/table_reader.h"
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#include "util/file_reader_writer.h"
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namespace rocksdb {
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struct SstFileReader::Rep {
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Options options;
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EnvOptions soptions;
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ImmutableCFOptions ioptions;
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MutableCFOptions moptions;
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std::unique_ptr<TableReader> table_reader;
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Rep(const Options& opts)
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: options(opts),
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soptions(options),
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ioptions(options),
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moptions(ColumnFamilyOptions(options)) {}
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};
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SstFileReader::SstFileReader(const Options& options) : rep_(new Rep(options)) {}
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SstFileReader::~SstFileReader() {}
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Status SstFileReader::Open(const std::string& file_path) {
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auto r = rep_.get();
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Status s;
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uint64_t file_size = 0;
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std::unique_ptr<RandomAccessFile> file;
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std::unique_ptr<RandomAccessFileReader> file_reader;
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s = r->options.env->GetFileSize(file_path, &file_size);
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if (s.ok()) {
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s = r->options.env->NewRandomAccessFile(file_path, &file, r->soptions);
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}
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if (s.ok()) {
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file_reader.reset(new RandomAccessFileReader(std::move(file), file_path));
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}
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if (s.ok()) {
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TableReaderOptions t_opt(r->ioptions, r->moptions.prefix_extractor.get(),
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r->soptions, r->ioptions.internal_comparator);
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// Allow open file with global sequence number for backward compatibility.
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t_opt.largest_seqno = kMaxSequenceNumber;
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s = r->options.table_factory->NewTableReader(t_opt, std::move(file_reader),
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file_size, &r->table_reader);
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}
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return s;
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}
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Iterator* SstFileReader::NewIterator(const ReadOptions& options) {
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auto r = rep_.get();
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auto sequence = options.snapshot != nullptr
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? options.snapshot->GetSequenceNumber()
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: kMaxSequenceNumber;
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auto internal_iter =
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r->table_reader->NewIterator(options, r->moptions.prefix_extractor.get());
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return NewDBIterator(r->options.env, options, r->ioptions, r->moptions,
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r->ioptions.user_comparator, internal_iter, sequence,
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r->moptions.max_sequential_skip_in_iterations,
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nullptr /* read_callback */);
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}
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std::shared_ptr<const TableProperties> SstFileReader::GetTableProperties()
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const {
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return rep_->table_reader->GetTableProperties();
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}
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Status SstFileReader::VerifyChecksum() {
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return rep_->table_reader->VerifyChecksum();
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}
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} // namespace rocksdb
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#endif // !ROCKSDB_LITE
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