disk_log_handler.h

/* Copyright (c) 2021-2022 OceanBase and/or its affiliates. All rights reserved.
miniob is licensed under Mulan PSL v2.
You can use this software according to the terms and conditions of the Mulan PSL v2.
You may obtain a copy of Mulan PSL v2 at:
         http://license.coscl.org.cn/MulanPSL2
THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
See the Mulan PSL v2 for more details. */
 
//
// Created by wangyunlai on 2024/02/01
//
 
#pragma once
 
#include "common/types.h"
#include "common/sys/rc.h"
#include "common/lang/vector.h"
#include "common/lang/deque.h"
#include "common/lang/memory.h"
#include "common/lang/thread.h"
#include "storage/clog/log_module.h"
#include "storage/clog/log_file.h"
#include "storage/clog/log_buffer.h"
#include "storage/clog/log_handler.h"
 
class LogReplayer;
 
class DiskLogHandler : public LogHandler
{
public:
  DiskLogHandler()          = default;
  virtual ~DiskLogHandler() = default;
 
  RC init(const char *path) override;
 
  RC start() override;
  RC stop() override;
 
  RC await_termination() override;
 
  RC replay(LogReplayer &replayer, LSN start_lsn) override;
 
  RC iterate(function<RC(LogEntry &)> consumer, LSN start_lsn) override;
 
  RC wait_lsn(LSN lsn) override;
 
  LSN current_lsn() const override { return entry_buffer_.current_lsn(); }
  LSN current_flushed_lsn() const { return entry_buffer_.flushed_lsn(); }
 
private:
  RC _append(LSN &lsn, LogModule module, vector<char> &&data) override;
 
private:
  void thread_func();
 
private:
  unique_ptr<thread> thread_;          
  atomic_bool        running_{false};  
 
  LogFileManager file_manager_;  
  LogEntryBuffer entry_buffer_;  
 
  string path_;  
};