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https://github.com/aykhans/AzSuicideDataVisualization.git
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69 lines
1.7 KiB
C++
69 lines
1.7 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <unordered_map>
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#include <utility>
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#include "arrow/util/mutex.h"
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namespace arrow {
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namespace util {
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template <typename K, typename V>
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class ConcurrentMap {
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public:
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void Insert(const K& key, const V& value) {
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auto lock = mutex_.Lock();
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map_.insert({key, value});
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}
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template <typename ValueFunc>
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V GetOrInsert(const K& key, ValueFunc&& compute_value_func) {
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auto lock = mutex_.Lock();
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auto it = map_.find(key);
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if (it == map_.end()) {
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auto pair = map_.emplace(key, compute_value_func());
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it = pair.first;
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}
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return it->second;
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}
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void Erase(const K& key) {
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auto lock = mutex_.Lock();
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map_.erase(key);
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}
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void Clear() {
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auto lock = mutex_.Lock();
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map_.clear();
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}
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size_t size() const {
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auto lock = mutex_.Lock();
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return map_.size();
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}
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private:
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std::unordered_map<K, V> map_;
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mutable arrow::util::Mutex mutex_;
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};
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} // namespace util
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} // namespace arrow
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