mirror of https://github.com/facebook/rocksdb.git
93 lines
2.5 KiB
C++
93 lines
2.5 KiB
C++
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// 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 "leveldb/db.h"
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#include "leveldb/env.h"
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#include "leveldb/status.h"
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#include "leveldb/table.h"
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#include "leveldb/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/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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Version* current = versions_->current();
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SequenceNumber snapshot = versions_->LastSequence();
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LookupKey lkey(key, snapshot);
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Version::GetStats stats;
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s = current->Get(options, lkey, value, &stats);
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return s;
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}
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Iterator* DBImplReadOnly::NewIterator(const ReadOptions& options) {
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std::vector<Iterator*> list;
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versions_->current()->AddIterators(options, &list);
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Iterator* internal_iter =
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NewMergingIterator(&internal_comparator_, &list[0], list.size());
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return NewDBIterator(
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&dbname_, env_, user_comparator(), internal_iter,
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reinterpret_cast<const SnapshotImpl*>(options.snapshot)->number_);
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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 no_log_recory, bool error_if_log_file_exist) {
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*dbptr = NULL;
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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, no_log_recory, error_if_log_file_exist);
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if (s.ok() && !no_log_recory) {
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s = impl->versions_->LogAndApply(&edit, &impl->mutex_);
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}
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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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