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/*
Copyright (c) 2012,2015 Monty Program Ab
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA */
#pragma once
/* C++ system header files */
#include <string>
/* MySQL includes */
#include "./m_ctype.h"
/* RocksDB header files */
#include "rocksdb/comparator.h"
/* MyRocks header files */
#include "./rdb_utils.h"
namespace myrocks {
/*
The keys are in form: {index_number} {mem-comparable-key}
(todo: knowledge about this format is shared between this class and
Rdb_key_def)
*/
class Rdb_pk_comparator : public rocksdb::Comparator {
public:
Rdb_pk_comparator(const Rdb_pk_comparator &) = delete;
Rdb_pk_comparator &operator=(const Rdb_pk_comparator &) = delete;
Rdb_pk_comparator() = default;
// extracting from rocksdb::BytewiseComparator()->Compare() for optimization
int Compare(const rocksdb::Slice &a, const rocksdb::Slice &b) const override {
return a.compare(b);
}
const char *Name() const override { return "RocksDB_SE_v3.10"; }
// TODO: advanced funcs:
// - FindShortestSeparator
// - FindShortSuccessor
// for now, do-nothing implementations:
void FindShortestSeparator(std::string *start,
const rocksdb::Slice &limit) const override {
rocksdb::BytewiseComparator()->FindShortestSeparator(start, limit);
}
void FindShortSuccessor(std::string *key) const override {
rocksdb::BytewiseComparator()->FindShortSuccessor(key);
}
};
class Rdb_rev_comparator : public rocksdb::Comparator {
public:
Rdb_rev_comparator(const Rdb_rev_comparator &) = delete;
Rdb_rev_comparator &operator=(const Rdb_rev_comparator &) = delete;
Rdb_rev_comparator() = default;
// extracting from rocksdb::BytewiseComparator()->Compare() for optimization
int Compare(const rocksdb::Slice &a, const rocksdb::Slice &b) const override {
return -a.compare(b);
}
const char *Name() const override { return "rev:RocksDB_SE_v3.10"; }
void FindShortestSeparator(std::string *start,
const rocksdb::Slice &limit) const override {
rocksdb::ReverseBytewiseComparator()->FindShortestSeparator(start, limit);
}
void FindShortSuccessor(std::string *key) const override {
rocksdb::ReverseBytewiseComparator()->FindShortSuccessor(key);
}
};
} // namespace myrocks
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