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46 lines
1.0 KiB
46 lines
1.0 KiB
//
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// Created by 马也驰 on 2024/12/29.
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//
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#ifndef LEVELDB_VLOG_GC_H
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#define LEVELDB_VLOG_GC_H
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#include <string>
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#include <mutex>
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#include "../db/slotpage.h"
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#include "../db/threadpool.h"
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#include "../db/vlog.h"
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// 前向声明 VlogSet
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class VlogSet;
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class VlogGC {
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public:
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VlogGC(SlotPage *s, VlogSet *vs) : slot_page_(s), vlog_set(vs) {}
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void do_gc(size_t old_vlog_num, size_t new_vlog_num);
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private:
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void exec_gc(size_t old_vlog_num, size_t new_vlog_num);
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inline bool value_deleted(uint16_t value_len) {
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return !(value_len >> 15);
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}
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inline uint16_t get_value_len(char *value) {
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uint16_t value_len;
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memcpy(&value_len, value, sizeof(uint16_t));
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return value_len;
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}
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inline size_t get_value_slotnum(char *value) {
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size_t slot_num;
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memcpy(&slot_num, &value[sizeof(uint16_t)], sizeof(size_t));
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return slot_num;
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}
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SlotPage *slot_page_;
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ThreadPool *thread_pool_;
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VlogSet *vlog_set; // 仅声明为指针，具体定义放在 vlog_gc.cpp
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};
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#endif // LEVELDB_VLOG_GC_H
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