mirror of https://github.com/milvus-io/milvus.git
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
// Licensed to the LF AI & Data foundation 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, 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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#pragma once
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#include "mmap/Column.h"
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namespace milvus::storage {
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extern std::map<std::string, int> ReadAheadPolicy_Map;
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class ChunkCache {
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public:
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explicit ChunkCache(std::string path,
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const std::string& read_ahead_policy,
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ChunkManagerPtr cm)
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: path_prefix_(std::move(path)), cm_(cm) {
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auto iter = ReadAheadPolicy_Map.find(read_ahead_policy);
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AssertInfo(iter != ReadAheadPolicy_Map.end(),
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"unrecognized read ahead policy: {}, "
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"should be one of `normal, random, sequential, "
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"willneed, dontneed`",
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read_ahead_policy);
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read_ahead_policy_ = iter->second;
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LOG_INFO("Init ChunkCache with prefix: {}, read_ahead_policy: {}",
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path_prefix_,
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read_ahead_policy);
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}
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~ChunkCache() = default;
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public:
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std::shared_ptr<ColumnBase>
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Read(const std::string& filepath);
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void
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Remove(const std::string& filepath);
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void
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Prefetch(const std::string& filepath);
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private:
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std::shared_ptr<ColumnBase>
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Mmap(const std::filesystem::path& path, const FieldDataPtr& field_data);
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std::string
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CachePath(const std::string& filepath);
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private:
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using ColumnTable =
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std::unordered_map<std::string, std::shared_ptr<ColumnBase>>;
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private:
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mutable std::shared_mutex mutex_;
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int read_ahead_policy_;
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const std::string path_prefix_;
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ChunkManagerPtr cm_;
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ColumnTable columns_;
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};
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using ChunkCachePtr = std::shared_ptr<milvus::storage::ChunkCache>;
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} // namespace milvus::storage
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