4ca3c67bd3
Summary: This diff replaces compaction_filter_args and CompactionFilter with a single compaction_filter parameter. It gives CompactionFilter better encapsulation and a similar look to Comparator and MergeOpertor, which improves consistency of the overall interface. The change is not backward compatible. Nevertheless, the two references in fbcode are not in production yet. Test Plan: make check Reviewers: dhruba Reviewed By: dhruba CC: leveldb, zshao Differential Revision: https://reviews.facebook.net/D10773
105 lines
3.0 KiB
C++
105 lines
3.0 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 "include/leveldb/compaction_filter.h"
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#include "db/db_impl.h"
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namespace leveldb {
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class DBWithTTL : public DB, CompactionFilter {
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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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bool read_only);
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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 Merge(const WriteOptions& options,
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const Slice& key,
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const Slice& value);
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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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// The following two methods are for CompactionFilter
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virtual bool Filter(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) const override;
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virtual const char* Name() const override;
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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 SanityCheckTimestamp(const std::string& str);
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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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static const int32_t kMinTimestamp = 1368146402; // 05/09/2013:5:40PM
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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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