84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
/*
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* Copyright 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <cstddef>
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#include <map>
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#include <mutex>
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#include <unordered_map>
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#include <vector>
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template <typename T>
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class SyncMapCount {
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public:
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struct Item {
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T item;
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size_t count;
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};
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private:
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std::map<const T, std::size_t> map_;
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size_t max_size_{SIZE_MAX};
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mutable std::mutex mutex_;
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std::vector<Item> Vectorize() const {
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std::vector<Item> vec;
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for (auto& it : this->Get()) {
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vec.push_back(Item{it.first, it.second});
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}
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return vec;
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}
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std::vector<Item> GetSorted(std::function<bool(const Item& a, const Item& b)> sort_func) const {
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std::vector<Item> vec = Vectorize();
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sort(vec.begin(), vec.end(), [=](const Item& a, const Item& b) -> bool { return sort_func(a, b); });
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return vec;
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}
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public:
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SyncMapCount() : max_size_(SIZE_MAX) {}
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explicit SyncMapCount(size_t max_size) : max_size_(max_size) {}
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~SyncMapCount() = default;
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void Put(const T item) {
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std::unique_lock<std::mutex> lock(mutex_);
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if (map_.size() == max_size_) return;
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(map_.count(item) > 0) ? map_[item] += 1 : map_[item] = 1;
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}
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std::map<const T, std::size_t> Get() const {
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std::unique_lock<std::mutex> lock(mutex_);
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return map_;
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}
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std::size_t Size() const {
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std::unique_lock<std::mutex> lock(mutex_);
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return map_.size();
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}
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void Clear() {
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std::unique_lock<std::mutex> lock(mutex_);
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map_.clear();
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}
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std::vector<Item> GetSortedHighToLow() const {
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return GetSorted([](const Item& a, const Item& b) -> bool { return a.count > b.count; });
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}
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std::vector<Item> GetSortedLowToHigh() const {
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return GetSorted([](const Item& a, const Item& b) -> bool { return a.count < b.count; });
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}
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};
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