fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
92 lines
2.5 KiB
92 lines
2.5 KiB
// Copyright (c) 2012 Facebook. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#include "db/db_impl_readonly.h"
|
|
#include "db/db_impl.h"
|
|
|
|
#include <algorithm>
|
|
#include <set>
|
|
#include <string>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <vector>
|
|
#include <algorithm>
|
|
#include "db/db_iter.h"
|
|
#include "db/dbformat.h"
|
|
#include "db/filename.h"
|
|
#include "db/log_reader.h"
|
|
#include "db/log_writer.h"
|
|
#include "db/memtable.h"
|
|
#include "db/table_cache.h"
|
|
#include "db/version_set.h"
|
|
#include "db/write_batch_internal.h"
|
|
#include "leveldb/db.h"
|
|
#include "leveldb/env.h"
|
|
#include "leveldb/status.h"
|
|
#include "leveldb/table.h"
|
|
#include "leveldb/table_builder.h"
|
|
#include "port/port.h"
|
|
#include "table/block.h"
|
|
#include "table/merger.h"
|
|
#include "table/two_level_iterator.h"
|
|
#include "util/coding.h"
|
|
#include "util/logging.h"
|
|
#include "util/build_version.h"
|
|
|
|
namespace leveldb {
|
|
|
|
DBImplReadOnly::DBImplReadOnly(const Options& options,
|
|
const std::string& dbname)
|
|
: DBImpl(options, dbname) {
|
|
Log(options_.info_log, "Opening the db in read only mode");
|
|
}
|
|
|
|
DBImplReadOnly::~DBImplReadOnly() {
|
|
}
|
|
|
|
// Implementations of the DB interface
|
|
Status DBImplReadOnly::Get(const ReadOptions& options,
|
|
const Slice& key,
|
|
std::string* value) {
|
|
Status s;
|
|
Version* current = versions_->current();
|
|
SequenceNumber snapshot = versions_->LastSequence();
|
|
LookupKey lkey(key, snapshot);
|
|
Version::GetStats stats;
|
|
s = current->Get(options, lkey, value, &stats);
|
|
return s;
|
|
}
|
|
|
|
Iterator* DBImplReadOnly::NewIterator(const ReadOptions& options) {
|
|
std::vector<Iterator*> list;
|
|
versions_->current()->AddIterators(options, &list);
|
|
Iterator* internal_iter =
|
|
NewMergingIterator(&internal_comparator_, &list[0], list.size());
|
|
return NewDBIterator(
|
|
&dbname_, env_, user_comparator(), internal_iter,
|
|
reinterpret_cast<const SnapshotImpl*>(options.snapshot)->number_);
|
|
}
|
|
|
|
|
|
Status DB::OpenForReadOnly(const Options& options, const std::string& dbname,
|
|
DB** dbptr, bool no_log_recory, bool error_if_log_file_exist) {
|
|
*dbptr = NULL;
|
|
|
|
DBImplReadOnly* impl = new DBImplReadOnly(options, dbname);
|
|
impl->mutex_.Lock();
|
|
VersionEdit edit(impl->NumberLevels());
|
|
Status s = impl->Recover(&edit, no_log_recory, error_if_log_file_exist);
|
|
if (s.ok() && !no_log_recory) {
|
|
s = impl->versions_->LogAndApply(&edit, &impl->mutex_);
|
|
}
|
|
impl->mutex_.Unlock();
|
|
if (s.ok()) {
|
|
*dbptr = impl;
|
|
} else {
|
|
delete impl;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
}
|
|
|