d786b25e2d
Summary: When opened with DBTimestamp::Open call, timestamps are prepended to and stripped from the value during subsequent Put and Get calls respectively. The Timestamp is used to discard values in Get and custom compaction filter which have exceeded their TTL which is specified during Open. Have made a temporary change to Makefile to let us test with the temporary file TestTime.cc. Have also changed the private members of db_impl.h to protected to let them be inherited by the new class DBTimestamp Test Plan: make db_timestamp; TestTime.cc(will not check it in) shows how to use the apis currently, but I will write unit-tests shortly Reviewers: dhruba, vamsi, haobo, sheki, heyongqiang, vkrest Reviewed By: vamsi CC: zshao, xjin, vkrest, MarkCallaghan Differential Revision: https://reviews.facebook.net/D10311
92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#ifndef LEVELDB_UTILITIES_TTL_DB_TTL_H_
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#define LEVELDB_UTILITIES_TTL_DB_TTL_H_
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#include "include/leveldb/db.h"
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#include "db/db_impl.h"
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namespace leveldb {
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class DBWithTTL : public DB {
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public:
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DBWithTTL(const int32_t ttl,
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const Options& options,
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const std::string& dbname,
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Status& st);
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virtual ~DBWithTTL();
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virtual Status Put(const WriteOptions& o,
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const Slice& key,
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const Slice& val);
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virtual Status Get(const ReadOptions& options,
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const Slice& key,
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std::string* value);
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virtual Status Delete(const WriteOptions& wopts, const Slice& key);
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virtual Status Write(const WriteOptions& opts, WriteBatch* updates);
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virtual Iterator* NewIterator(const ReadOptions& opts);
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virtual const Snapshot* GetSnapshot();
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virtual void ReleaseSnapshot(const Snapshot* snapshot);
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virtual bool GetProperty(const Slice& property, std::string* value);
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virtual void GetApproximateSizes(const Range* r, int n, uint64_t* sizes);
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virtual void CompactRange(const Slice* begin, const Slice* end);
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virtual int NumberLevels();
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virtual int MaxMemCompactionLevel();
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virtual int Level0StopWriteTrigger();
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virtual Status Flush(const FlushOptions& fopts);
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virtual Status DisableFileDeletions();
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virtual Status EnableFileDeletions();
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virtual Status GetLiveFiles(std::vector<std::string>& vec, uint64_t* mfs);
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virtual SequenceNumber GetLatestSequenceNumber();
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virtual Status GetUpdatesSince(SequenceNumber seq_number,
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unique_ptr<TransactionLogIterator>* iter);
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// Simulate a db crash, no elegant closing of database.
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void TEST_Destroy_DBWithTtl();
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static bool DeleteByTS(void* args,
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int level,
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const Slice& key,
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const Slice& old_val,
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std::string* new_val,
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bool* value_changed);
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static bool IsStale(const Slice& value, int32_t ttl);
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static Status AppendTS(const Slice& val, std::string& val_with_ts);
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static Status StripTS(std::string* str);
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static Status GetCurrentTime(int32_t& curtime);
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static const int32_t kTSLength = sizeof(int32_t); // size of timestamp
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private:
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DB* db_;
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int32_t ttl_;
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};
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}
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#endif // LEVELDB_UTILITIES_TTL_DB_TTL_H_
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