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// 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.
#ifndef LEVELDB_UTILITIES_TTL_DB_TTL_H_
#define LEVELDB_UTILITIES_TTL_DB_TTL_H_
#include "include/leveldb/db.h"
#include "db/db_impl.h"
namespace leveldb {
class DBWithTTL : public DB {
public:
DBWithTTL(const int32_t ttl,
const Options& options,
const std::string& dbname,
Status& st);
virtual ~DBWithTTL();
virtual Status Put(const WriteOptions& o,
const Slice& key,
const Slice& val);
virtual Status Get(const ReadOptions& options,
const Slice& key,
std::string* value);
virtual Status Delete(const WriteOptions& wopts, const Slice& key);
virtual Status Write(const WriteOptions& opts, WriteBatch* updates);
virtual Iterator* NewIterator(const ReadOptions& opts);
virtual const Snapshot* GetSnapshot();
virtual void ReleaseSnapshot(const Snapshot* snapshot);
virtual bool GetProperty(const Slice& property, std::string* value);
virtual void GetApproximateSizes(const Range* r, int n, uint64_t* sizes);
virtual void CompactRange(const Slice* begin, const Slice* end);
virtual int NumberLevels();
virtual int MaxMemCompactionLevel();
virtual int Level0StopWriteTrigger();
virtual Status Flush(const FlushOptions& fopts);
virtual Status DisableFileDeletions();
virtual Status EnableFileDeletions();
virtual Status GetLiveFiles(std::vector<std::string>& vec, uint64_t* mfs);
virtual SequenceNumber GetLatestSequenceNumber();
virtual Status GetUpdatesSince(SequenceNumber seq_number,
unique_ptr<TransactionLogIterator>* iter);
// Simulate a db crash, no elegant closing of database.
void TEST_Destroy_DBWithTtl();
static bool DeleteByTS(void* args,
int level,
const Slice& key,
const Slice& old_val,
std::string* new_val,
bool* value_changed);
static bool IsStale(const Slice& value, int32_t ttl);
static Status AppendTS(const Slice& val, std::string& val_with_ts);
static Status StripTS(std::string* str);
static Status GetCurrentTime(int32_t& curtime);
static const int32_t kTSLength = sizeof(int32_t); // size of timestamp
private:
DB* db_;
int32_t ttl_;
};
}
#endif // LEVELDB_UTILITIES_TTL_DB_TTL_H_
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