diff --git a/.gitignore b/.gitignore
index 1ac43a1..28b9f56 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ test/coverage
 # Dev
 .DS_Store
 .nova/*
+.php-cs-fixer.cache
diff --git a/README.md b/README.md
index c10302d..32df986 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ PHP >= 8.0
 ### MySQL
 
 ```php
-use Phant\Client\MySQL as ClientMySQL;
+use Phant\Client\Service\MySQL as ClientMySQL;
 
 $clientMySQL = new ClientMySQL(
 	'127.0.0.1',
@@ -99,16 +99,35 @@ $exist = $clientMySQL->existByColumnValue(
 ### S3
 
 ```php
-use Phant\Client\S3 as ClientS3;
+use Phant\Client\Service\S3 as ClientS3;
 
 $clientS3 = new ClientS3(
 	$region,
 	$endpoint,
 	$accessKey,
 	$secretKey,
+);
+$clientS3->setObject($bucket, 'foo', 'bar');
+$bar = $clientS3->getObject($bucket, 'foo');
+$clientS3->deleteObject($bucket, 'foo');
+```
+
+### S3 Bucket
+
+```php
+use Phant\Client\Service\S3 as ClientS3;
+use Phant\Client\Service\S3\Object as ClientS3Object;
+
+$clientS3Object = new ClientS3Object(
+	new ClientS3(
+		$region,
+		$endpoint,
+		$accessKey,
+		$secretKey,
+	),
 	$bucket
 );
-$clientS3->set('foo', 'bar');
-$bar = $clientS3->get('foo');
-$clientS3->delete('foo');
+$clientS3Object->set('foo', 'bar');
+$bar = $clientS3Object->get('foo');
+$clientS3Object->delete('foo');
 ```
diff --git a/component/MySQL.php b/component/MySQL.php
deleted file mode 100644
index 14e35b2..0000000
--- a/component/MySQL.php
+++ /dev/null
@@ -1,108 +0,0 @@
-<?php
-declare(strict_types=1);
-
-namespace Phant\Client;
-
-use PDO;
-
-use Phant\Error\NotFound;
-
-class MySQL
-{
-	protected PDO $pdo;
-	
-	public function __construct(
-		string $host,
-		string $dbname,
-		string $user,
-		string $pass,
-		string $port = '3306',
-		string $charset = 'utf8mb4'
-	)
-	{
-		$this->pdo = new PDO(
-			'mysql:host=' . $host . ';dbname=' . $dbname . ';port=' . $port . ';charset=' . $charset, 
-			$user, 
-			$pass, 
-			[
-				PDO::ATTR_EMULATE_PREPARES		=> false,
-				PDO::MYSQL_ATTR_DIRECT_QUERY	=> false,
-				PDO::ATTR_ERRMODE				=> PDO::ERRMODE_EXCEPTION
-			]
-		);
-	}
-	
-	public function execute(string $query, array $values = []): void
-	{
-		$query = $this->pdo->prepare($query);
-		$query->execute($values);
-	}
-	
-	public function getList(string $query, array $values = []): array
-	{
-		$query = $this->pdo->prepare($query);
-		$query->execute($values);
-		$all = $query->fetchAll();
-		
-		if ($query->rowCount() == 0) {
-			throw new NotFound;
-		}
-		
-		return $all;
-	}
-	
-	public function getListByColumnValue(string $table, string $column, string|int|float|bool $value): array
-	{
-		return $this->getList('
-			SELECT * 
-			FROM `' . $table . '` 
-			WHERE `' . $column . '` = :value
-		', [
-			':value'	=> $value,
-		]);
-	}
-	
-	public function get(string $query, array $values = []): array
-	{
-		$query = $this->pdo->prepare($query);
-		$query->execute($values);
-		$one = $query->fetch();
-		
-		if ($query->rowCount() == 0) {
-			throw new NotFound;
-		}
-		
-		return $one;
-	}
-	
-	public function getByColumnValue(string $table, string $column, string|int|float|bool $value): array
-	{
-		return $this->get('
-			SELECT * 
-			FROM `' . $table . '` 
-			WHERE `' . $column . '` = :value
-		', [
-			':value'	=> $value,
-		]);
-	}
-	
-	public function exist(string $query, array $values = []): bool
-	{
-		$query = $this->pdo->prepare($query);
-		$query->execute($values);
-		$exist = $query->fetch(PDO::FETCH_ASSOC);
-		
-		return ($exist != false);
-	}
-	
-	public function existByColumnValue(string $table, string $column, string|int|float|bool $value): bool
-	{
-		return $this->exist('
-			SELECT * 
-			FROM `' . $table . '` 
-			WHERE `' . $column . '` = :value
-		', [
-			':value'	=> $value,
-		]);
-	}
-}
diff --git a/component/Port/MySQL.php b/component/Port/MySQL.php
new file mode 100644
index 0000000..20525dc
--- /dev/null
+++ b/component/Port/MySQL.php
@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phant\Client\Port;
+
+interface MySQL
+{
+    public function execute(
+        string $query,
+        array $values = []
+    ): void;
+
+    public function getList(
+        string $query,
+        array $values = []
+    ): array;
+
+    public function getListByColumnValue(
+        string $table,
+        string $column,
+        string|int|float|bool $value
+    ): array;
+
+    public function get(
+        string $query,
+        array $values = []
+    ): array;
+
+    public function getByColumnValue(
+        string $table,
+        string $column,
+        string|int|float|bool $value
+    ): array;
+
+    public function exist(
+        string $query,
+        array $values = []
+    ): bool;
+
+    public function existByColumnValue(
+        string $table,
+        string $column,
+        string|int|float|bool $value
+    ): bool;
+}
diff --git a/component/Port/S3.php b/component/Port/S3.php
new file mode 100644
index 0000000..ac301eb
--- /dev/null
+++ b/component/Port/S3.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phant\Client\Port;
+
+interface S3
+{
+    public function setObject(
+        string $bucket,
+        string $key,
+        string $body
+    ): void;
+
+    public function getObject(
+        string $bucket,
+        string $key
+    ): string;
+
+    public function deleteObject(
+        string $bucket,
+        string $key
+    ): void;
+}
diff --git a/component/Port/S3/Object.php b/component/Port/S3/Object.php
new file mode 100644
index 0000000..901eff7
--- /dev/null
+++ b/component/Port/S3/Object.php
@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phant\Client\Port\S3;
+
+interface Object
+{
+    public function set(
+        string $key,
+        string $body
+    ): void;
+
+    public function get(
+        string $key
+    ): string;
+
+    public function delete(
+        string $key
+    ): void;
+}
diff --git a/component/S3.php b/component/S3.php
deleted file mode 100644
index 0fd901f..0000000
--- a/component/S3.php
+++ /dev/null
@@ -1,62 +0,0 @@
-<?php
-declare(strict_types=1);
-
-namespace Phant\Client;
-
-use Aws\S3\S3Client;
-
-use Phant\Error\NotFound;
-
-class S3
-{
-	protected S3Client $S3Client;
-	
-	public function __construct(string $region, string $endpoint, string $accessKey, string $secretKey, string $version = '2006-03-01')
-	{
-		$this->S3Client = new S3Client([
-			'region' => $region,
-			'endpoint' => $endpoint,
-			'credentials' => [
-				'key'		=> $accessKey,
-				'secret'	=> $secretKey,
-			],
-			'version' => $version,
-			'use_path_style_endpoint' => true
-		]);
-	}
-	
-	public function set(string $bucket, string $key, string $body)
-	{
-		$this->S3Client->putObject([
-			'Bucket'	=> $bucket,
-			'Key'		=> $key,
-			'Body'		=> $body,
-		]);
-	}
-	
-	public function get(string $bucket, string $key): string
-	{
-		try {
-			$object = $this->S3Client->getObject([
-				'Bucket'	=> $bucket,
-				'Key'		=> $key,
-			]);
-			
-			return $object['Body']->getContents();
-		} catch (\Exception $e) {
-			throw new NotFound('Object : ' . $key);
-		}
-	}
-	
-	public function delete(string $bucket, string $key)
-	{
-		try {
-			$this->S3Client->deleteObject([
-				'Bucket'	=> $bucket,
-				'Key'		=> $key,
-			]);
-		} catch (\Exception $e) {
-			throw new NotFound('Object : ' . $key);
-		}
-	}
-}
diff --git a/component/Service/MySQL.php b/component/Service/MySQL.php
new file mode 100644
index 0000000..12d0adf
--- /dev/null
+++ b/component/Service/MySQL.php
@@ -0,0 +1,122 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phant\Client\Service;
+
+use PDO;
+use Phant\Error\NotFound;
+
+class MySQL implements \Phant\Client\Port\MySQL
+{
+    protected PDO $pdo;
+
+    public function __construct(
+        string $host,
+        string $dbname,
+        string $user,
+        string $pass,
+        int $port = 3306,
+        string $charset = 'utf8mb4',
+        ?array $config = [
+            PDO::ATTR_EMULATE_PREPARES		=> false,
+            PDO::MYSQL_ATTR_DIRECT_QUERY	=> false,
+            PDO::ATTR_ERRMODE				=> PDO::ERRMODE_EXCEPTION
+        ]
+    ) {
+        $this->pdo = new PDO(
+            'mysql:host=' . $host . ';dbname=' . $dbname . ';port=' . $port . ';charset=' . $charset,
+            $user,
+            $pass,
+            $config
+        );
+    }
+
+    public function execute(
+        string $query,
+        array $values = []
+    ): void {
+        $statement = $this->pdo->prepare($query);
+        $statement->execute($values);
+    }
+
+    public function getList(
+        string $query,
+        array $values = []
+    ): array {
+        $statement = $this->pdo->prepare($query);
+        $statement->execute($values);
+        $all = $statement->fetchAll();
+
+        if ($statement->rowCount() == 0) {
+            throw new NotFound();
+        }
+
+        return $all;
+    }
+
+    public function getListByColumnValue(
+        string $table,
+        string $column,
+        string|int|float|bool $value
+    ): array {
+        return $this->getList(
+            'SELECT * FROM `' . $table . '` WHERE `' . $column . '` = :value',
+            [
+                ':value'	=> $value,
+            ]
+        );
+    }
+
+    public function get(
+        string $query,
+        array $values = []
+    ): array {
+        $statement = $this->pdo->prepare($query);
+        $statement->execute($values);
+        $one = $statement->fetch();
+
+        if ($statement->rowCount() == 0) {
+            throw new NotFound();
+        }
+
+        return $one;
+    }
+
+    public function getByColumnValue(
+        string $table,
+        string $column,
+        string|int|float|bool $value
+    ): array {
+        return $this->get(
+            'SELECT * FROM `' . $table . '` WHERE `' . $column . '` = :value',
+            [
+                ':value'	=> $value,
+            ]
+        );
+    }
+
+    public function exist(
+        string $query,
+        array $values = []
+    ): bool {
+        $statement = $this->pdo->prepare($query);
+        $statement->execute($values);
+        $exist = $statement->fetch(PDO::FETCH_ASSOC);
+
+        return ($exist != false);
+    }
+
+    public function existByColumnValue(
+        string $table,
+        string $column,
+        string|int|float|bool $value
+    ): bool {
+        return $this->exist(
+            'SELECT * FROM `' . $table . '` WHERE `' . $column . '` = :value',
+            [
+                ':value'	=> $value,
+            ]
+        );
+    }
+}
diff --git a/component/Service/S3.php b/component/Service/S3.php
new file mode 100644
index 0000000..77ee9bf
--- /dev/null
+++ b/component/Service/S3.php
@@ -0,0 +1,74 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phant\Client\Service;
+
+use Aws\S3\S3Client;
+use Phant\Error\NotFound;
+
+class S3 implements \Phant\Client\Port\S3
+{
+    protected S3Client $S3Client;
+
+    public function __construct(
+        string $region,
+        string $endpoint,
+        string $accessKey,
+        string $secretKey,
+        string $version = '2006-03-01'
+    ) {
+        $this->S3Client = new S3Client([
+            'region' => $region,
+            'endpoint' => $endpoint,
+            'credentials' => [
+                'key'		=> $accessKey,
+                'secret'	=> $secretKey,
+            ],
+            'version' => $version,
+            'use_path_style_endpoint' => true
+        ]);
+    }
+
+    public function setObject(
+        string $bucket,
+        string $key,
+        string $body
+    ): void {
+        $this->S3Client->putObject([
+            'Bucket'	=> $bucket,
+            'Key'		=> $key,
+            'Body'		=> $body,
+        ]);
+    }
+
+    public function getObject(
+        string $bucket,
+        string $key
+    ): string {
+        try {
+            $object = $this->S3Client->getObject([
+                'Bucket'	=> $bucket,
+                'Key'		=> $key,
+            ]);
+
+            return $object['Body']->getContents();
+        } catch (\Exception $e) {
+            throw new NotFound('Object : ' . $key);
+        }
+    }
+
+    public function deleteObject(
+        string $bucket,
+        string $key
+    ): void {
+        try {
+            $this->S3Client->deleteObject([
+                'Bucket'	=> $bucket,
+                'Key'		=> $key,
+            ]);
+        } catch (\Exception $e) {
+            throw new NotFound('Object : ' . $key);
+        }
+    }
+}
diff --git a/component/Service/S3/Object.php b/component/Service/S3/Object.php
new file mode 100644
index 0000000..e371a37
--- /dev/null
+++ b/component/Service/S3/Object.php
@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phant\Client\Service\S3;
+
+use Phant\Client\Service\S3;
+
+class Object implements \Phant\Client\Port\S3\Object
+{
+    public function __construct(
+        protected readonly S3 $client,
+        protected readonly string $bucket
+    ) {
+    }
+
+    public function set(
+        string $key,
+        string $body
+    ): void {
+        $this->client->setObject(
+            $this->bucket,
+            $key,
+            $body,
+        );
+    }
+
+    public function get(
+        string $key
+    ): string {
+        return $this->client->getObject(
+            $this->bucket,
+            $key,
+        );
+    }
+
+    public function delete(
+        string $key
+    ): void {
+        $this->client->deleteObject(
+            $this->bucket,
+            $key,
+        );
+    }
+}
diff --git a/composer.json b/composer.json
index 9c2710a..b0ec56e 100644
--- a/composer.json
+++ b/composer.json
@@ -10,14 +10,16 @@
         }
     ],
     "require": {
-        "php": "^8.0",
+        "php": ">=8.1",
         "phant/error": "1.*",
-        "aws/aws-sdk-php": "^3.215"
+        "aws/aws-sdk-php": "3.*"
     },
     "require-dev": {
+        "friendsofphp/php-cs-fixer": "^3.0",
         "phpstan/phpstan": "^1.4"
     },
     "scripts": {
+        "lint": "vendor/bin/php-cs-fixer fix ./ --rules=@PSR12",
         "analyse": "vendor/bin/phpstan analyse component --memory-limit=4G"
     },
     "autoload": {