oop-in-javaee
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Java EEにおけるDependency Injectionの基礎 某所で発表した10分間の「不出来な」スライドです。 先方を考慮して珍しく日本語フォントを使いましたが、どうでしょうか？
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JJUG 11月ナイトセミナー CDIをはじめよう
JJUG 11月ナイトセミナー CDIをはじめようNorito Agetsuma JJUG 11月ナイトセミナーの発表資料です。
DI使用時のインタフェース使用の要否については、はてなブログにて補足しています。
http://n-agetsuma.hatenablog.com/entry/2013/12/11/211017
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oop-in-javaee
- 1. Java EEにおける Dependency Injectionの基礎 2021-08-05 蓮沼 賢志 (HASUNUMA Kenji) [email protected]
- 2. 復習：オブジェクト指向プログラミングとは？ • オブジェクト＝データ(フィールド)と操作(メソッド)の集合体 • オブジェクトの定義＝クラス、オブジェクトの実体＝インスタンス • オブジェクト間のメッセージ・パッシング(=メソッド呼び出し)でデータ処理(=プログラム) を記述・実行する • オブジェクト指向プログラミングの３要素 ※上記に比べればさほど重要ではない • カプセル化 (Encapsulation) • 継承 (Inheritance) • 多態性 (Polymorphism)
- 3. オブジェクトと依存性について • “A は B に依存している” → A と B は密結合である • a が b を直接生成できないケー スがある • a と b の生存期間が異なる 例: a はHTTPリクエスト毎に生成 されるが、b は複数のリクエスト にまたがって生存する • b がネットワーク上のオブジェク トである(分散コンポーネント) • 解決案 → A と B を疎結合にする
- 4. 疎結合の実現方法①：JNDIルックアップ 1. A は B を知らない → b にアクセスできない 2. A は JNDI から B を取得する → b へのアクセス手段 b’ を 得られる 3. B として b’ を呼び出す → 間接的に b を呼び出す • 事前に B を JNDI へ登録してお く必要がある • A は JNDI から B を明示的に取 得する必要がある
- 5. 疎結合の実現方法②：Dependency Injection (DI) 1. m は A に B を設定する → A は m から B へのアクセ ス手段 b’ を得ている 2. B として b’ を呼び出す →間接的に b を呼び出す • m は A に対して B への依存性 (Dependency) を 注入 (Inject) している • b’ の取得方法がJNDIルック アップと逆になっている →制御の反転 (Inverse of Control)