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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#pragma once
#ifndef ROCKSDB_LITE
#include <string>
#include <vector>
#include "db/db_impl/db_impl.h"
namespace ROCKSDB_NAMESPACE {
// TODO: Share common structure with CompactedDBImpl and DBImplSecondary
class DBImplReadOnly : public DBImpl {
public:
DBImplReadOnly(const DBOptions& options, const std::string& dbname);
// No copying allowed
DBImplReadOnly(const DBImplReadOnly&) = delete;
void operator=(const DBImplReadOnly&) = delete;
virtual ~DBImplReadOnly();
// Implementations of the DB interface
using DB::Get;
virtual Status Get(const ReadOptions& options,
ColumnFamilyHandle* column_family, const Slice& key,
PinnableSlice* value) override;
Status Get(const ReadOptions& options, ColumnFamilyHandle* column_family,
const Slice& key, PinnableSlice* value,
std::string* timestamp) override;
// TODO: Implement ReadOnly MultiGet?
using DBImpl::NewIterator;
virtual Iterator* NewIterator(const ReadOptions&,
ColumnFamilyHandle* column_family) override;
virtual Status NewIterators(
const ReadOptions& options,
const std::vector<ColumnFamilyHandle*>& column_families,
std::vector<Iterator*>* iterators) override;
using DBImpl::Put;
virtual Status Put(const WriteOptions& /*options*/,
ColumnFamilyHandle* /*column_family*/,
const Slice& /*key*/, const Slice& /*value*/) override {
return Status::NotSupported("Not supported operation in read only mode.");
}
using DBImpl::PutEntity;
Status PutEntity(const WriteOptions& /* options */,
ColumnFamilyHandle* /* column_family */,
const Slice& /* key */,
const WideColumns& /* columns */) override {
return Status::NotSupported("Not supported operation in read only mode.");
}
using DBImpl::Merge;
virtual Status Merge(const WriteOptions& /*options*/,
ColumnFamilyHandle* /*column_family*/,
const Slice& /*key*/, const Slice& /*value*/) override {
return Status::NotSupported("Not supported operation in read only mode.");
}
using DBImpl::Delete;
virtual Status Delete(const WriteOptions& /*options*/,
ColumnFamilyHandle* /*column_family*/,
const Slice& /*key*/) override {
return Status::NotSupported("Not supported operation in read only mode.");
}
using DBImpl::SingleDelete;
virtual Status SingleDelete(const WriteOptions& /*options*/,
ColumnFamilyHandle* /*column_family*/,
const Slice& /*key*/) override {
return Status::NotSupported("Not supported operation in read only mode.");
}
virtual Status Write(const WriteOptions& /*options*/,
WriteBatch* /*updates*/) override {
return Status::NotSupported("Not supported operation in read only mode.");
}
using DBImpl::CompactRange;
virtual Status CompactRange(const CompactRangeOptions& /*options*/,
ColumnFamilyHandle* /*column_family*/,
const Slice* /*begin*/,
const Slice* /*end*/) override {
return Status::NotSupported("Not supported operation in read only mode.");
}
using DBImpl::CompactFiles;
virtual Status CompactFiles(
const CompactionOptions& /*compact_options*/,
ColumnFamilyHandle* /*column_family*/,
const std::vector<std::string>& /*input_file_names*/,
const int /*output_level*/, const int /*output_path_id*/ = -1,
std::vector<std::string>* const /*output_file_names*/ = nullptr,
CompactionJobInfo* /*compaction_job_info*/ = nullptr) override {
return Status::NotSupported("Not supported operation in read only mode.");
}
virtual Status DisableFileDeletions() override {
return Status::NotSupported("Not supported operation in read only mode.");
}
virtual Status EnableFileDeletions(bool /*force*/) override {
return Status::NotSupported("Not supported operation in read only mode.");
}
virtual Status GetLiveFiles(std::vector<std::string>& ret,
uint64_t* manifest_file_size,
bool /*flush_memtable*/) override {
return DBImpl::GetLiveFiles(ret, manifest_file_size,
false /* flush_memtable */);
}
using DBImpl::Flush;
virtual Status Flush(const FlushOptions& /*options*/,
ColumnFamilyHandle* /*column_family*/) override {
return Status::NotSupported("Not supported operation in read only mode.");
}
using DBImpl::SyncWAL;
virtual Status SyncWAL() override {
return Status::NotSupported("Not supported operation in read only mode.");
}
using DB::IngestExternalFile;
virtual Status IngestExternalFile(
ColumnFamilyHandle* /*column_family*/,
const std::vector<std::string>& /*external_files*/,
const IngestExternalFileOptions& /*ingestion_options*/) override {
return Status::NotSupported("Not supported operation in read only mode.");
}
using DB::CreateColumnFamilyWithImport;
virtual Status CreateColumnFamilyWithImport(
const ColumnFamilyOptions& /*options*/,
const std::string& /*column_family_name*/,
const ImportColumnFamilyOptions& /*import_options*/,
const ExportImportFilesMetaData& /*metadata*/,
ColumnFamilyHandle** /*handle*/) override {
return Status::NotSupported("Not supported operation in read only mode.");
}
// FIXME: some missing overrides for more "write" functions
protected:
#ifndef ROCKSDB_LITE
Status FlushForGetLiveFiles() override {
// No-op for read-only DB
return Status::OK();
}
#endif // !ROCKSDB_LITE
private:
// A "helper" function for DB::OpenForReadOnly without column families
// to reduce unnecessary I/O
// It has the same functionality as DB::OpenForReadOnly with column families
// but does not check the existence of dbname in the file system
static Status OpenForReadOnlyWithoutCheck(
const DBOptions& db_options, const std::string& dbname,
const std::vector<ColumnFamilyDescriptor>& column_families,
std::vector<ColumnFamilyHandle*>* handles, DB** dbptr,
bool error_if_wal_file_exists = false);
friend class DB;
};
} // namespace ROCKSDB_NAMESPACE
#endif // !ROCKSDB_LITE
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