fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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95 lines
2.6 KiB
95 lines
2.6 KiB
// Copyright (c) 2012 Facebook. 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.
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#include "db/db_impl_readonly.h"
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#include "db/db_impl.h"
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#include <algorithm>
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#include <set>
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#include <string>
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#include <stdint.h>
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#include <stdio.h>
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#include <vector>
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#include <algorithm>
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#include "db/db_iter.h"
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#include "db/dbformat.h"
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#include "db/filename.h"
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#include "db/log_reader.h"
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#include "db/log_writer.h"
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#include "db/memtable.h"
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#include "db/table_cache.h"
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#include "db/version_set.h"
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#include "db/write_batch_internal.h"
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#include "rocksdb/db.h"
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#include "rocksdb/env.h"
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#include "rocksdb/status.h"
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#include "rocksdb/table_builder.h"
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#include "port/port.h"
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#include "table/block.h"
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#include "table/merger.h"
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#include "table/table.h"
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#include "table/two_level_iterator.h"
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#include "util/coding.h"
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#include "util/logging.h"
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#include "util/build_version.h"
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namespace leveldb {
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DBImplReadOnly::DBImplReadOnly(const Options& options,
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const std::string& dbname)
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: DBImpl(options, dbname) {
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Log(options_.info_log, "Opening the db in read only mode");
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}
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DBImplReadOnly::~DBImplReadOnly() {
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}
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// Implementations of the DB interface
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Status DBImplReadOnly::Get(const ReadOptions& options,
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const Slice& key,
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std::string* value) {
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Status s;
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MemTable* mem = GetMemTable();
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Version* current = versions_->current();
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SequenceNumber snapshot = versions_->LastSequence();
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std::deque<std::string> merge_operands;
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LookupKey lkey(key, snapshot);
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if (mem->Get(lkey, value, &s, &merge_operands, options_)) {
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} else {
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Version::GetStats stats;
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current->Get(options, lkey, value, &s, &merge_operands, &stats, options_);
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}
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return s;
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}
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Iterator* DBImplReadOnly::NewIterator(const ReadOptions& options) {
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SequenceNumber latest_snapshot;
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Iterator* internal_iter = NewInternalIterator(options, &latest_snapshot);
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return NewDBIterator(
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&dbname_, env_, options_, user_comparator(),internal_iter,
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(options.snapshot != nullptr
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? reinterpret_cast<const SnapshotImpl*>(options.snapshot)->number_
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: latest_snapshot));
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}
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Status DB::OpenForReadOnly(const Options& options, const std::string& dbname,
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DB** dbptr, bool error_if_log_file_exist) {
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*dbptr = nullptr;
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DBImplReadOnly* impl = new DBImplReadOnly(options, dbname);
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impl->mutex_.Lock();
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VersionEdit edit(impl->NumberLevels());
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Status s = impl->Recover(&edit, impl->GetMemTable(),
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error_if_log_file_exist);
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impl->mutex_.Unlock();
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if (s.ok()) {
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*dbptr = impl;
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} else {
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delete impl;
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}
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return s;
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}
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}
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