// 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 <shared_mutex>

#include <unordered_map>

#include "io/cache/file_cache_storage.h"

namespace doris::io {

class ShardMemHashTable {

public:

    ShardMemHashTable() = default;

    Status remove(const FileCacheKey& key);

    Status append(const FileCacheKey& key, const Slice& value);

    Status appendv(const FileCacheKey& key, const Slice* values, size_t value_cnt);

    Status append_iobuf(const FileCacheKey& key, const butil::IOBuf& value);

    Status read(const FileCacheKey& key, size_t value_offset, Slice buffer);

    Status read_to_iobuf(const FileCacheKey& key, size_t value_offset, size_t bytes_req,

                         butil::IOBuf* out, size_t* bytes_read);

    Status clear();

private:

    std::shared_mutex _shard_mt;

    std::unordered_map<FileWriterMapKey, MemBlock, FileWriterMapKeyHash> _cache_map;

};

} // namespace doris::io