You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: log.rs
    path of file: ./repos/CYFS/src/component/cyfs-backup/src/data
    
    the code of the file until where you have to start completion: use cyfs_base::*;

use file_rotate::{compression::Compression, suffix::AppendCount, ContentLimit, FileRotate};
use std::sync::Mutex;
use std::{io::Write, path::PathBuf};
    
    pub fn new(state_default_isolate: Option<ObjectId>, dir: PathBuf) -> Self {
        let file = dir.join("error.log");
        let error = BackupLogFile::new(file);

        let file = dir.join("missing.log");
        let missing = BackupLogFile::new(file);

        Self {
            state_default_isolate,
            error: Mutex::new(error),
            missing: Mutex::new(missing),
        }
    }