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Feature/lru cache
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| /* | ||
| * (C) Copyright 2024- ECMWF. | ||
| * | ||
| * This software is licensed under the terms of the Apache Licence Version 2.0 | ||
| * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0. | ||
| * In applying this licence, ECMWF does not waive the privileges and immunities | ||
| * granted to it by virtue of its status as an intergovernmental organisation nor | ||
| * does it submit to any jurisdiction. | ||
| */ | ||
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| /// @author Christopher Bradley | ||
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| #pragma once | ||
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| #include <list> | ||
| #include <unordered_map> | ||
| #include "eckit/exception/Exceptions.h" | ||
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| namespace gribjump { | ||
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| // Note: not a thread safe container, use an external lock if needed | ||
| template <typename K, typename V> | ||
| class LRUCache { | ||
| public: | ||
| LRUCache(size_t capacity) : capacity_(capacity) {} | ||
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| void put(const K& key, const V& value) { | ||
| if (map_.find(key) == map_.end()) { | ||
| if (list_.size() == capacity_) { | ||
| auto last = list_.back(); | ||
| list_.pop_back(); | ||
| map_.erase(last); | ||
| } | ||
| list_.push_front(key); | ||
| } else { | ||
| list_.remove(key); | ||
| list_.push_front(key); | ||
| } | ||
| map_[key] = value; | ||
| } | ||
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| V& get(const K& key) { | ||
| if (map_.find(key) == map_.end()) { | ||
| throw eckit::BadValue("Key does not exist"); | ||
| } | ||
| list_.remove(key); | ||
| list_.push_front(key); | ||
| return map_[key]; | ||
| } | ||
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| bool exists(const K& key) { | ||
| return map_.find(key) != map_.end(); | ||
| } | ||
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| typename std::unordered_map<K, V>::const_iterator begin() const { | ||
| return map_.begin(); | ||
| } | ||
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| typename std::unordered_map<K, V>::const_iterator end() const { | ||
| return map_.end(); | ||
| } | ||
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| void clear() { | ||
| list_.clear(); | ||
| map_.clear(); | ||
| } | ||
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| private: | ||
| size_t capacity_; | ||
| std::list<K> list_; | ||
| std::unordered_map<K, V> map_; | ||
| }; | ||
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| } // namespace gribjump |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| /* | ||
| * (C) Copyright 2024- ECMWF. | ||
| * | ||
| * This software is licensed under the terms of the Apache Licence Version 2.0 | ||
| * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0. | ||
| * In applying this licence, ECMWF does not waive the privileges and immunities | ||
| * granted to it by virtue of its status as an intergovernmental organisation | ||
| * nor does it submit to any jurisdiction. | ||
| */ | ||
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| #include <cmath> | ||
| #include <fstream> | ||
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| #include "eckit/testing/Test.h" | ||
| #include "gribjump/info/LRUCache.h" | ||
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| #include "metkit/mars/MarsParser.h" | ||
| #include "metkit/mars/MarsExpension.h" | ||
| using namespace eckit::testing; | ||
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| namespace gribjump { | ||
| namespace test { | ||
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| // Miscellanous unit tests | ||
| //----------------------------------------------------------------------------- | ||
| CASE( "test_lru" ){ | ||
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| LRUCache<std::string, int> cache(3); | ||
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| // Check basic functionality | ||
| cache.put("a", 1); | ||
| cache.put("b", 2); | ||
| cache.put("c", 3); | ||
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| EXPECT(cache.get("a") == 1); | ||
| EXPECT(cache.get("b") == 2); | ||
| EXPECT(cache.get("c") == 3); | ||
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| cache.put("d", 4); | ||
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| EXPECT_THROWS_AS(cache.get("a"), eckit::BadValue); | ||
| EXPECT(cache.get("d") == 4); | ||
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| // Check recency is updated with get | ||
| cache.put("x", 1); | ||
| cache.put("y", 2); | ||
| cache.put("z", 3); | ||
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| EXPECT(cache.get("z") == 3); | ||
| EXPECT(cache.get("y") == 2); | ||
| EXPECT(cache.get("x") == 1); | ||
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| // z should now be the least recently used | ||
| cache.put("w", 1); | ||
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| EXPECT_THROWS_AS(cache.get("z"), eckit::BadValue); | ||
| } | ||
| //----------------------------------------------------------------------------- | ||
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| } // namespace test | ||
| } // namespace gribjump | ||
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| int main(int argc, char **argv) | ||
| { | ||
| return run_tests ( argc, argv ); | ||
| } |