29 lines
928 B
C++
29 lines
928 B
C++
#pragma once
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#include "file_reader.hpp"
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#include "file_writer.hpp"
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#include "record.hpp"
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#include <vector>
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class MergeSorter {
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private:
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std::vector<Record> buffer_;
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const std::string& tmp_dir_;
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size_t buffer_rows_ = 0;
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size_t disk_reads_ = 0;
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size_t disk_writes_ = 0;
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size_t phases_ = 0;
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std::span<Record> get_chunk_span(size_t chunk_index);
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size_t create_initial_runs(const std::string& input_file, const std::string& next_dir);
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size_t merge_pass(const std::string& current_dir, const std::string& next_dir, size_t run_count);
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void perform_k_way_merge(std::vector<std::unique_ptr<FileReader>>& readers,
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FileWriter& writer);
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public:
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MergeSorter(size_t buffer_rows, size_t buffer_cols, const std::string& tmp_dir);
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void sort_file(const std::string& input_file, const std::string& output_file);
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size_t disk_reads();
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size_t disk_writes();
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size_t phases();
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};
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