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68 lines
2.3 KiB
68 lines
2.3 KiB
//
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// Created by 马也驰 on 2024/12/29.
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//
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#include "vlog_gc.h"
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#include "../db/vlog_set.h"
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void VlogGC::do_gc(size_t old_vlog_num, size_t new_vlog_num) {
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thread_pool_->enqueue([this, old_vlog_num, new_vlog_num]()
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{ this->exec_gc(old_vlog_num, new_vlog_num); });
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}
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void VlogGC::exec_gc(size_t old_vlog_num, size_t new_vlog_num) {
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auto old_vlog_name = vlog_set->get_vlog_name(old_vlog_num);
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auto new_vlog_name = vlog_set->get_vlog_name(new_vlog_num);
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auto old_vlog_info = vlog_set->get_vlog_info(old_vlog_num);
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auto new_vlog_info = vlog_set->get_vlog_info(new_vlog_num);
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auto old_vlog_handler = vlog_set->get_vlog_handler(old_vlog_num);
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auto new_vlog_handler = vlog_set->get_vlog_handler(new_vlog_num);
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old_vlog_handler->vlog_latch_.soft_lock();
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new_vlog_info->vlog_info_latch_.lock();
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new_vlog_handler->vlog_latch_.hard_lock();
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auto old_vlog = std::fstream(old_vlog_name, std::ios::in | std::ios::out);
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auto new_vlog = std::fstream(new_vlog_name, std::ios::in | std::ios::out);
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char old_vlog_buff[VLOG_SIZE];
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char new_vlog_buff[VLOG_SIZE];
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old_vlog.seekp(0);
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old_vlog.read(old_vlog_buff, VLOG_SIZE);
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// memcpy(new_vlog_buff, &value_nums, sizeof(size_t));
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size_t value_nums = old_vlog_info->value_nums;
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size_t ovb_off = 2 * sizeof(size_t);
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size_t nvb_off = 2 * sizeof(size_t);
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size_t new_vlog_value_nums = 0;
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for (auto i = 0; i < value_nums; i++) {
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char *value = &old_vlog_buff[ovb_off];
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uint16_t value_len = get_value_len(value);
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size_t slot_num = get_value_slotnum(value);
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if (!value_deleted(value_len)) {
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memcpy(&new_vlog_buff[nvb_off], &old_vlog_buff[ovb_off], value_len);
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struct slot_content scn(new_vlog_info->vlog_num, nvb_off);
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slot_page_->set_slot(slot_num, &scn);
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nvb_off += value_len;
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new_vlog_value_nums ++;
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}
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ovb_off += value_len;
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}
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new_vlog_info->value_nums = value_nums;
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new_vlog_info->curr_size = nvb_off;
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memcpy(new_vlog_buff, &nvb_off, sizeof(size_t));
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memcpy(&new_vlog_buff[sizeof(size_t)], &new_vlog_value_nums, sizeof(size_t));
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new_vlog.write(new_vlog_buff, VLOG_SIZE);
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new_vlog.flush();
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old_vlog.close();
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new_vlog.close();
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old_vlog_handler->vlog_latch_.soft_unlock();
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new_vlog_info->vlog_info_latch_.unlock();
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new_vlog_handler->vlog_latch_.hard_unlock();
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vlog_set->remove_old_vlog(old_vlog_num);
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}
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