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rocksdb/include/utilities/stackable_db.h

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4.6 KiB

// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#pragma once
#include "rocksdb/db.h"
namespace rocksdb {
// This class contains APIs to stack rocksdb wrappers.Eg. Stack TTL over base d
class StackableDB : public DB {
public:
explicit StackableDB(StackableDB* sdb) : sdb_(sdb) {}
// Returns the DB object that is the lowermost component in the stack of DBs
virtual DB* GetRawDB() {
return sdb_->GetRawDB();
}
// convert a DB to StackableDB
// TODO: This function does not work yet. Passing nullptr to StackableDB in
// NewStackableDB's constructor will cause segfault on object's usage
static StackableDB* DBToStackableDB(DB* db) {
class NewStackableDB : public StackableDB {
public:
NewStackableDB(DB* db)
: StackableDB(nullptr),
db_(db) {}
DB* GetRawDB() {
return db_;
}
private:
DB* db_;
};
return new NewStackableDB(db);
}
virtual Status Put(const WriteOptions& options,
const Slice& key,
const Slice& val) override {
return sdb_->Put(options, key, val);
}
virtual Status Get(const ReadOptions& options,
const Slice& key,
std::string* value) override {
return sdb_->Get(options, key, value);
}
virtual std::vector<Status> MultiGet(const ReadOptions& options,
const std::vector<Slice>& keys,
std::vector<std::string>* values)
override {
return sdb_->MultiGet(options, keys, values);
}
virtual bool KeyMayExist(const ReadOptions& options,
const Slice& key,
std::string* value,
bool* value_found = nullptr) override {
return sdb_->KeyMayExist(options, key, value, value_found);
}
virtual Status Delete(const WriteOptions& wopts, const Slice& key) override {
return sdb_->Delete(wopts, key);
}
virtual Status Merge(const WriteOptions& options,
const Slice& key,
const Slice& value) override {
return sdb_->Merge(options, key, value);
}
virtual Status Write(const WriteOptions& opts, WriteBatch* updates)
override {
return sdb_->Write(opts, updates);
}
virtual Iterator* NewIterator(const ReadOptions& opts) override {
return sdb_->NewIterator(opts);
}
virtual const Snapshot* GetSnapshot() override {
return sdb_->GetSnapshot();
}
virtual void ReleaseSnapshot(const Snapshot* snapshot) override {
return sdb_->ReleaseSnapshot(snapshot);
}
virtual bool GetProperty(const Slice& property, std::string* value)
override {
return sdb_->GetProperty(property, value);
}
virtual void GetApproximateSizes(const Range* r, int n, uint64_t* sizes)
override {
return sdb_->GetApproximateSizes(r, n, sizes);
}
virtual void CompactRange(const Slice* begin, const Slice* end,
bool reduce_level = false,
int target_level = -1) override {
return sdb_->CompactRange(begin, end, reduce_level, target_level);
}
virtual int NumberLevels() override {
return sdb_->NumberLevels();
}
virtual int MaxMemCompactionLevel() override {
return sdb_->MaxMemCompactionLevel();
}
virtual int Level0StopWriteTrigger() override {
return sdb_->Level0StopWriteTrigger();
}
virtual Status Flush(const FlushOptions& fopts) override {
return sdb_->Flush(fopts);
}
virtual Status DisableFileDeletions() override {
return sdb_->DisableFileDeletions();
}
virtual Status EnableFileDeletions() override {
return sdb_->EnableFileDeletions();
}
virtual Status GetLiveFiles(std::vector<std::string>& vec, uint64_t* mfs,
bool flush_memtable = true) override {
return sdb_->GetLiveFiles(vec, mfs, flush_memtable);
}
virtual SequenceNumber GetLatestSequenceNumber() override {
return sdb_->GetLatestSequenceNumber();
}
virtual Status GetSortedWalFiles(VectorLogPtr& files) override {
return sdb_->GetSortedWalFiles(files);
}
virtual Status DeleteWalFiles(const VectorLogPtr& files) override {
return sdb_->DeleteWalFiles(files);
}
virtual Status GetUpdatesSince(SequenceNumber seq_number,
unique_ptr<TransactionLogIterator>* iter)
override {
return sdb_->GetUpdatesSince(seq_number, iter);
}
protected:
StackableDB* sdb_;
};
} // namespace rocksdb