// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

#pragma once

#include "io/file_factory.h"

#include "io/fs/file_reader_writer_fwd.h"

#include "util/obj_lru_cache.h"

namespace doris {

// A file meta cache depends on a LRU cache.

// Such as parsed parquet footer.

// The capacity will limit the number of cache entries in cache.

class FileMetaCache {

public:

    FileMetaCache(int64_t capacity) : _cache(capacity) {}

    FileMetaCache(const FileMetaCache&) = delete;

    const FileMetaCache& operator=(const FileMetaCache&) = delete;

    ObjLRUCache& cache() { return _cache; }

    static std::string get_key(const std::string file_name, int64_t modification_time,

                               int64_t file_size);

    static std::string get_key(io::FileReaderSPtr file_reader,

                               const io::FileDescription& _file_description);

    bool lookup(const std::string& key, ObjLRUCache::CacheHandle* handle) {

        return _cache.lookup({key}, handle);

    }

    template <typename T>

    void insert(const std::string& key, T* value, ObjLRUCache::CacheHandle* handle) {

        _cache.insert({key}, value, handle);

    }

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    void insert(const std::string& key, T* value, ObjLRUCache::CacheHandle* handle) {

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        _cache.insert({key}, value, handle);

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    }

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    void insert(const std::string& key, T* value, ObjLRUCache::CacheHandle* handle) {

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        _cache.insert({key}, value, handle);

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    }

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    void insert(const std::string& key, T* value, ObjLRUCache::CacheHandle* handle) {

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        _cache.insert({key}, value, handle);

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    }

    bool enabled() const { return _cache.enabled(); }

private:

    ObjLRUCache _cache;

};

} // namespace doris