rocksdb/db/db_impl_readonly.h
heyongqiang 3fcf533ed0 Add a readonly db
Summary: as subject

Test Plan: run db_bench readrandom

Reviewers: dhruba

Reviewed By: dhruba

CC: MarkCallaghan, emayanke, sheki

Differential Revision: https://reviews.facebook.net/D6495
2012-11-07 14:19:48 -08:00

73 lines
2.1 KiB
C++

// 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.
#ifndef STORAGE_LEVELDB_DB_DB_IMPL_READONLY_H_
#define STORAGE_LEVELDB_DB_DB_IMPL_READONLY_H_
#include "db/db_impl.h"
#include <deque>
#include <set>
#include "db/dbformat.h"
#include "db/log_writer.h"
#include "db/snapshot.h"
#include "leveldb/db.h"
#include "leveldb/env.h"
#include "port/port.h"
#include "util/stats_logger.h"
#ifdef USE_SCRIBE
#include "scribe/scribe_logger.h"
#endif
namespace leveldb {
class DBImplReadOnly : public DBImpl {
public:
DBImplReadOnly(const Options& options, const std::string& dbname);
virtual ~DBImplReadOnly();
// Implementations of the DB interface
virtual Status Get(const ReadOptions& options,
const Slice& key,
std::string* value);
virtual Iterator* NewIterator(const ReadOptions&);
virtual Status Put(const WriteOptions&, const Slice& key, const Slice& value) {
return Status::NotSupported("Not supported operation in read only mode.");
}
virtual Status Delete(const WriteOptions&, const Slice& key) {
return Status::NotSupported("Not supported operation in read only mode.");
}
virtual Status Write(const WriteOptions& options, WriteBatch* updates) {
return Status::NotSupported("Not supported operation in read only mode.");
}
virtual void CompactRange(const Slice* begin, const Slice* end) {
}
virtual Status DisableFileDeletions() {
return Status::NotSupported("Not supported operation in read only mode.");
}
virtual Status EnableFileDeletions() {
return Status::NotSupported("Not supported operation in read only mode.");
}
virtual Status GetLiveFiles(std::vector<std::string>&,
uint64_t* manifest_file_size) {
return Status::NotSupported("Not supported operation in read only mode.");
}
virtual Status Flush(const FlushOptions& options) {
return Status::NotSupported("Not supported operation in read only mode.");
}
private:
friend class DB;
// No copying allowed
DBImplReadOnly(const DBImplReadOnly&);
void operator=(const DBImplReadOnly&);
};
}
#endif