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.
101 lines
2.9 KiB
101 lines
2.9 KiB
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
//
|
|
// 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/merge_context.h"
|
|
#include "db/table_cache.h"
|
|
#include "db/version_set.h"
|
|
#include "db/write_batch_internal.h"
|
|
#include "rocksdb/db.h"
|
|
#include "rocksdb/env.h"
|
|
#include "rocksdb/status.h"
|
|
#include "rocksdb/table.h"
|
|
#include "rocksdb/merge_operator.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 rocksdb {
|
|
|
|
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;
|
|
MemTable* mem = GetMemTable();
|
|
Version* current = versions_->current();
|
|
SequenceNumber snapshot = versions_->LastSequence();
|
|
MergeContext merge_context;
|
|
LookupKey lkey(key, snapshot);
|
|
if (mem->Get(lkey, value, &s, merge_context, options_)) {
|
|
} else {
|
|
Version::GetStats stats;
|
|
current->Get(options, lkey, value, &s, &merge_context, &stats, options_);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Iterator* DBImplReadOnly::NewIterator(const ReadOptions& options) {
|
|
SequenceNumber latest_snapshot;
|
|
Iterator* internal_iter = NewInternalIterator(options, &latest_snapshot);
|
|
return NewDBIterator(
|
|
&dbname_, env_, options_, user_comparator(),internal_iter,
|
|
(options.snapshot != nullptr
|
|
? reinterpret_cast<const SnapshotImpl*>(options.snapshot)->number_
|
|
: latest_snapshot));
|
|
}
|
|
|
|
|
|
Status DB::OpenForReadOnly(const Options& options, const std::string& dbname,
|
|
DB** dbptr, bool error_if_log_file_exist) {
|
|
*dbptr = nullptr;
|
|
|
|
DBImplReadOnly* impl = new DBImplReadOnly(options, dbname);
|
|
impl->mutex_.Lock();
|
|
VersionEdit edit;
|
|
Status s = impl->Recover(&edit, impl->GetMemTable(),
|
|
error_if_log_file_exist);
|
|
impl->mutex_.Unlock();
|
|
if (s.ok()) {
|
|
*dbptr = impl;
|
|
} else {
|
|
delete impl;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
}
|
|
|