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f229f244d2
https://github.com/milvus-io/milvus/issues/35112 This pr would not affect milvus functionality by now. It implments a Chunk memory layout that looks like ``` VariableColumn |offset|offset|offset| |data|data|data| ``` We maybe move offsets to the beginning and add null bitmaps later but not in this PR. And mmap test will also be added in another PR. --------- Signed-off-by: sunby <sunbingyi1992@gmail.com>
96 lines
2.3 KiB
C++
96 lines
2.3 KiB
C++
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "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 distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License
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#pragma once
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <cstddef>
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#include "common/File.h"
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namespace milvus {
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class ChunkTarget {
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public:
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virtual void
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write(const void* data, size_t size, bool append = true) = 0;
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virtual void
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skip(size_t size) = 0;
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virtual void
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seek(size_t offset) = 0;
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virtual std::pair<char*, size_t>
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get() = 0;
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virtual ~ChunkTarget() = default;
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virtual size_t
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tell() = 0;
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};
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class MmapChunkTarget : public ChunkTarget {
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public:
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MmapChunkTarget(File& file, size_t offset) : file_(file), offset_(offset) {
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}
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void
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write(const void* data, size_t size, bool append = true) override;
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void
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skip(size_t size) override;
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void
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seek(size_t offset) override;
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std::pair<char*, size_t>
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get() override;
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size_t
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tell() override;
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private:
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File& file_;
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size_t offset_ = 0;
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size_t size_ = 0;
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};
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class MemChunkTarget : public ChunkTarget {
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public:
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MemChunkTarget(size_t cap) : cap_(cap) {
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data_ = reinterpret_cast<char*>(mmap(nullptr,
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cap,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANON,
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-1,
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0));
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}
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void
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write(const void* data, size_t size, bool append = true) override;
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void
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skip(size_t size) override;
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void
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seek(size_t offset) override;
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std::pair<char*, size_t>
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get() override;
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size_t
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tell() override;
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private:
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char* data_; // no need to delete in destructor, will be deleted by Chunk
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size_t cap_;
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size_t size_ = 0;
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};
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} // namespace milvus
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