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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
// 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 "monitoring/perf_context_imp.h"
#include "rocksdb/comparator.h"
namespace ROCKSDB_NAMESPACE {
// Wrapper of user comparator, with auto increment to
// perf_context.user_key_comparison_count.
class UserComparatorWrapper {
public:
// `UserComparatorWrapper`s constructed with the default constructor are not
// usable and will segfault on any attempt to use them for comparisons.
UserComparatorWrapper() : user_comparator_(nullptr) {}
explicit UserComparatorWrapper(const Comparator* const user_cmp)
: user_comparator_(user_cmp) {}
~UserComparatorWrapper() = default;
const Comparator* user_comparator() const { return user_comparator_; }
int Compare(const Slice& a, const Slice& b) const {
PERF_COUNTER_ADD(user_key_comparison_count, 1);
return user_comparator_->Compare(a, b);
}
bool Equal(const Slice& a, const Slice& b) const {
PERF_COUNTER_ADD(user_key_comparison_count, 1);
return user_comparator_->Equal(a, b);
}
int CompareTimestamp(const Slice& ts1, const Slice& ts2) const {
return user_comparator_->CompareTimestamp(ts1, ts2);
}
int CompareWithoutTimestamp(const Slice& a, const Slice& b) const {
PERF_COUNTER_ADD(user_key_comparison_count, 1);
return user_comparator_->CompareWithoutTimestamp(a, b);
}
int CompareWithoutTimestamp(const Slice& a, bool a_has_ts, const Slice& b,
bool b_has_ts) const {
PERF_COUNTER_ADD(user_key_comparison_count, 1);
return user_comparator_->CompareWithoutTimestamp(a, a_has_ts, b, b_has_ts);
}
bool EqualWithoutTimestamp(const Slice& a, const Slice& b) const {
return user_comparator_->EqualWithoutTimestamp(a, b);
}
private:
const Comparator* user_comparator_;
};
} // namespace ROCKSDB_NAMESPACE
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