Rustでのファイル同期とフラッシュを徹底解説：sync_allの使い方と応用

use std::fs::File;
use std::io::{Write, Result};

fn main() -> Result<()> {
    // ファイルを開く（なければ作成）
    let mut file = File::create("example.txt")?;

    // データを書き込む
    file.write_all(b"Hello, Rust!")?;

    // データをディスクに確実に書き込む
    file.sync_all()?;

    Ok(())
}

use std::fs::File;
use std::io::{Write, Result};

fn write_data_safely(file_path: &str, data: &[u8]) -> Result<()> {
    // ファイルを開く（または作成）
    let mut file = File::create(file_path)?;

    // データを書き込む
    file.write_all(data)?;

    // データをディスクに確実に保存
    file.sync_all()?; // バッファをフラッシュし、同期を保証

    Ok(())
}

fn main() -> Result<()> {
    // 安全にデータを書き込む関数を呼び出す
    write_data_safely("secure_data.txt", b"Important data")?;
    println!("Data has been safely written and synced.");
    Ok(())
}

use std::fs::OpenOptions;
use std::io::{Write, Result};

fn log_message(file_path: &str, message: &str) -> Result<()> {
    let mut file = OpenOptions::new().create(true).append(true).open(file_path)?;
    writeln!(file, "{}", message)?;
    file.sync_all()?; // 各ログエントリを同期
    Ok(())
}

fn main() -> Result<()> {
    log_message("system.log", "Application started.")?;
    println!("Log has been written and synced.");
    Ok(())
}

use std::fs::File;
use std::io::{Write, Result};

fn main() -> Result<()> {
    let mut file = File::create("example.txt")?;

    // データを書き込む
    file.write_all(b"Hello, Rust!")?;

    // sync_all: データとメタデータを同期
    file.sync_all()?; 

    // sync_data: データ本体のみを同期
    file.sync_data()?; 

    Ok(())
}

use std::fs::File;
use std::io::{Write, Result};

fn main() -> Result<()> {
    let mut file = File::create("example.txt")?;
    file.write_all(b"Buffered data")?;

    // バッファをフラッシュ（ディスク同期は保証されない）
    file.flush()?; 

    Ok(())
}

use std::fs::File;
use std::io::{Write, Result};

fn main() -> Result<()> {
    // ファイルを作成または開く
    let mut file = File::create("example.txt")?;

    // データを書き込む
    file.write_all(b"This is a test data.")?;

    // データとメタデータをディスクに確実に書き込む
    file.sync_all()?; 

    println!("Data successfully written and synced.");
    Ok(())
}

use std::fs::File;
use std::io::{Write, Result};

fn main() -> Result<()> {
    // ファイルを作成
    let mut file = File::create("transaction_log.txt")?;

    // トランザクション開始
    file.write_all(b"Transaction Start\n")?;

    // データを追加
    file.write_all(b"Step 1: Write data\n")?;
    file.write_all(b"Step 2: Update record\n")?;

    // トランザクションを終了し、同期
    file.write_all(b"Transaction End\n")?;
    file.sync_all()?; 

    println!("Transaction data successfully written and synced.");
    Ok(())
}

use std::fs::OpenOptions;
use std::io::{Write, Result};

fn log_message(file_path: &str, message: &str) -> Result<()> {
    // ファイルを開き、追記モードを有効化
    let mut file = OpenOptions::new()
        .create(true)
        .append(true)
        .open(file_path)?;

    // メッセージを書き込む
    writeln!(file, "{}", message)?;

    // 各メッセージを確実に同期
    file.sync_all()?;
    Ok(())
}

fn main() -> Result<()> {
    // ログメッセージを記録
    log_message("app.log", "Application started.")?;
    log_message("app.log", "User logged in.")?;
    log_message("app.log", "Application shut down.")?;

    println!("Logs successfully written and synced.");
    Ok(())
}

use tokio::fs::File;
use tokio::io::{AsyncWriteExt, Result};

#[tokio::main]
async fn main() -> Result<()> {
    // 非同期ファイル作成
    let mut file = File::create("async_example.txt").await?;

    // 非同期データ書き込み
    file.write_all(b"Async data with sync_all").await?;

    // 同期操作
    file.sync_all().await?;

    println!("Async file operation completed with sync.");
    Ok(())
}

use std::fs::File;
use std::io::{Write, Result, ErrorKind};

fn main() -> Result<()> {
    // ファイルを作成
    let mut file = File::create("example.txt")?;

    // データを書き込む
    file.write_all(b"Hello, Rust!")?;

    // 同期操作とエラー処理
    match file.sync_all() {
        Ok(_) => println!("File synchronized successfully."),
        Err(e) => match e.kind() {
            ErrorKind::PermissionDenied => {
                eprintln!("Permission denied: Cannot sync the file.");
            }
            ErrorKind::OutOfMemory => {
                eprintln!("Disk full: Failed to sync the file.");
            }
            _ => {
                eprintln!("Unexpected error occurred: {:?}", e);
            }
        },
    }

    Ok(())
}

use std::fs::File;
use std::io::{Write, Result, Error};

fn sync_with_retry(file: &mut File, retries: usize) -> Result<()> {
    for _ in 0..retries {
        if file.sync_all().is_ok() {
            return Ok(());
        }
    }
    Err(Error::new(std::io::ErrorKind::Other, "Failed to sync after retries"))
}

fn main() -> Result<()> {
    // ファイルを作成
    let mut file = File::create("retry_example.txt")?;
    file.write_all(b"Retry logic in Rust")?;

    // リトライ処理付き同期
    if let Err(e) = sync_with_retry(&mut file, 3) {
        eprintln!("Sync failed: {:?}", e);
    } else {
        println!("File synchronized successfully with retries.");
    }

    Ok(())
}

use std::fs::{File, OpenOptions};
use std::io::{Write, Result};

fn log_error(log_path: &str, message: &str) -> Result<()> {
    let mut log_file = OpenOptions::new()
        .create(true)
        .append(true)
        .open(log_path)?;
    writeln!(log_file, "{}", message)?;
    Ok(())
}

fn main() -> Result<()> {
    let mut file = File::create("log_example.txt")?;
    file.write_all(b"Logging errors example.")?;

    if let Err(e) = file.sync_all() {
        log_error("error.log", &format!("Sync failed: {:?}", e))?;
    } else {
        println!("File synchronized successfully.");
    }

    Ok(())
}

use tokio::fs::File;
use tokio::io::AsyncWriteExt;
use std::fs::File as SyncFile;
use std::io::Write;

#[tokio::main]
async fn main() -> tokio::io::Result<()> {
    // 非同期でファイルを作成
    let mut async_file = File::create("async_with_sync.txt").await?;
    async_file.write_all(b"Async and Sync example").await?;

    // 同期操作を非同期タスク内で実行
    let sync_result = tokio::task::spawn_blocking(|| {
        let mut sync_file = SyncFile::open("async_with_sync.txt").expect("Failed to open file");
        sync_file.sync_all().expect("Failed to sync file");
    }).await;

    match sync_result {
        Ok(_) => println!("File synchronized successfully in a blocking task."),
        Err(e) => eprintln!("Failed to sync file: {:?}", e),
    }

    Ok(())
}

use tokio::fs::OpenOptions;
use tokio::io::AsyncWriteExt;
use std::fs::File as SyncFile;

async fn write_and_sync(file_path: &str, data: &str) -> tokio::io::Result<()> {
    // 非同期ファイル操作
    let mut async_file = OpenOptions::new()
        .create(true)
        .append(true)
        .open(file_path)
        .await?;
    async_file.write_all(data.as_bytes()).await?;

    // 同期操作を非同期タスクで実行
    tokio::task::spawn_blocking(move || {
        let mut sync_file = SyncFile::open(file_path).expect("Failed to open file");
        sync_file.sync_all().expect("Failed to sync file");
    }).await?;

    Ok(())
}

#[tokio::main]
async fn main() -> tokio::io::Result<()> {
    write_and_sync("async_sync_log.txt", "Log entry: Async and Sync integration\n").await?;
    println!("Log entry written and synchronized.");
    Ok(())
}

use std::fs::{OpenOptions, File};
use std::io::{Write, Result};

fn commit_transaction(db_path: &str, data: &str) -> Result<()> {
    let mut file = OpenOptions::new()
        .create(true)
        .append(true)
        .open(db_path)?;

    // データを書き込む
    writeln!(file, "{}", data)?;

    // データを同期
    file.sync_all()?;
    Ok(())
}

fn main() -> Result<()> {
    commit_transaction("database.log", "Transaction: Update record 123")?;
    println!("Transaction committed and synced.");
    Ok(())
}

use std::fs::{File, OpenOptions};
use std::io::{Write, Result};

fn log_event(file_path: &str, message: &str) -> Result<()> {
    let mut file = OpenOptions::new()
        .create(true)
        .append(true)
        .open(file_path)?;
    writeln!(file, "{}", message)?;
    file.sync_all()?; // 各ログエントリを同期
    Ok(())
}

fn main() -> Result<()> {
    log_event("system.log", "System initialized")?;
    log_event("system.log", "User logged in")?;
    log_event("system.log", "System shutting down")?;
    println!("Logs successfully written and synced.");
    Ok(())
}

use std::fs::{File, OpenOptions};
use std::io::{Write, Result};

fn record_progress(file_path: &str, progress: u32) -> Result<()> {
    let mut file = OpenOptions::new()
        .create(true)
        .append(true)
        .open(file_path)?;
    writeln!(file, "Progress: {}%", progress)?;
    file.sync_all()?; // 進行状況を同期
    Ok(())
}

fn main() -> Result<()> {
    record_progress("backup_progress.log", 10)?;
    record_progress("backup_progress.log", 50)?;
    record_progress("backup_progress.log", 100)?;
    println!("Backup progress recorded and synced.");
    Ok(())
}

use std::fs::File;
use std::io::{Write, Result};

fn save_temp_config(file_path: &str, config_data: &str) -> Result<()> {
    let mut file = File::create(file_path)?;
    file.write_all(config_data.as_bytes())?;
    file.sync_all()?; // 設定データを同期
    Ok(())
}

fn main() -> Result<()> {
    save_temp_config("temp_config.txt", "temp_setting=true")?;
    println!("Temporary configuration saved and synced.");
    Ok(())
}