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To “new” or not to “new”… (2008-09-30) http://misko.hevery.com/2008/09/30/to-new-or-not-to-new/ 區分 injectable 跟 newable，遵守 injectable 不透過 constructor 要求 newable，或是 newable 不透過 constructor 要求 injectable，就可以讓程式好測試
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When to inject: the distinction between newables and injectables - Invisible to the eye (2009-07-29) http://www.giorgiosironi.com/2009/07/when-to-inject-distinction-between.html 有看過
Mail會自己送信的嗎? 就算透過 factory 成功將MailService注入，還是會有一些問題，其中 serialization/deserialization 的觀點尤其特別；因為 entity 因為 stateful 所以是 newable，而 service 因為 stateless 所以是 injectable，掌握 "service 可以相依 entity，但反過來不行" 的原則，從$mail = new Mail($this._service, $title, $text); $mail->send();演變成$mail = new Mail($title, $text); $this->_service->send($mail); -
Never write the same code twice: Dependency Injection - Invisible to the eye (2009-07-28) http://www.giorgiosironi.com/2009/07/never-write-same-code-twice-dependency.html #ril
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Domain-Driven Design and Spring http://static.olivergierke.de/lectures/ddd-and-spring/#ddd.spring 提到 entity 跟 value object 都是 newable。
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Breaking the Law of Demeter is Like Looking for a Needle in the Haystack (2008-07-18) http://misko.hevery.com/2008/07/18/breaking-the-law-of-demeter-is-like-looking-for-a-needle-in-the-haystack/ 注入 A，再從 A 取得 B 是不好的 #ril
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Inversion of Control Containers and the Dependency Injection pattern https://www.martinfowler.com/articles/injection.html DI 的 Class Diagram #ril
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Dependency Injection Myth: Reference Passing (2008-10-21) http://misko.hevery.com/2008/10/21/dependency-injection-myth-reference-passing/ 只要求自己會用到的 dependency，若是要求 A 再拿到 B，應該要直接要求 B；但 injectable factory 是個例外嗎?? #ril
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Application Wiring on Auto-Pilot (2008-09-24) http://misko.hevery.com/2008/09/24/application-wiring-on-auto-pilot/ #ril
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Dagger ‡ A fast dependency injector for Android and Java. https://google.github.io/dagger/android.html 提到 "a class shouldn’t know anything about how it isinjected" 的原則?? #ril
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Dependency injection - Wikipedia https://en.wikipedia.org/wiki/Dependency_injection #ril
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Understanding Dependencies http://tutorials.jenkov.com/ood/understanding-dependencies.html #ril
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Circular Dependency in constructors and Dependency Injection http://misko.hevery.com/2008/08/01/circular-dependency-in-constructors-and-dependency-injection/ #ril
- Dependency Injection (DI) vs. Inversion of Control (IOC) - CodeProject https://www.codeproject.com/Articles/592372/Dependency-Injection-DI-vs-Inversion-of-Control-IO 提到 DI 是 IoC 的子集 (subtype) #ril
- Constructor Injection vs. Setter Injection (2009-02-19) http://misko.hevery.com/2009/02/19/constructor-injection-vs-setter-injection/ 一開始可能會覺得 setter injection 比較好，尤其測試期間可以透過 setter 換成 test doubles。但 constructor injection 可以要求 initialization 的順序 (做為別人的 collaborator，自己要先完成 initialization)、可以避免 circular dependencies、可以將 collaborator field 設為
final幫助理解它在 (object) lifetime 都不會變。反過來說，這就是 setter injection 的問題；setter injection 容易忘記呼叫 setter，什麼時候 wiring 才算完成也不清楚 (最後一個 setter call?) - Repeat After Me: Setter Injection is a Symptom of Design Problems - DZone Java (2012-06-15) https://dzone.com/articles/repeat-after-me-setter 如果發現 constructor injection 用起來不順手，通常反應了 design 上的問題；若真的遇到無法使用 constructor injection 的情境 (不是 design problem)，可以把 setter injection 當做是個 workaround。
- java - Why use constructor over setter injection in CDI? - Stack Overflow http://stackoverflow.com/questions/19381846/ #ril
- 總覺得 current user 與 database 裡的那個 user entity 是不同的?? 在 Android 上似乎不用規劃出一個 request scope，因為只有一個 user。
- To “new” or not to “new”… http://misko.hevery.com/2008/09/30/to-new-or-not-to-new/ 提到 newable (也就是 value object) 不適合由 injection framework 提供，但 user 算是 value object 嗎?? 或更精確地說是 "current user"
- Dependency injection with Dagger 2 - Custom scopes – froger_mcs dev blog – Coding with love http://frogermcs.github.io/dependency-injection-with-dagger-2-custom-scopes/ 提到
@UserScope，從系統架構來看，可以更方便取得Userinstance 而不用透過 intent 傳遞，需要用到 user data 的人也可以直接從 constructor 要求User。 - User object 似乎是個很特別的應用，像是個 configuration??
- Java dependency injection: Injecting domain objects instead of infrastructure components (2014-11-10) http://www.mscharhag.com/java/dependency-injection-domain-objects 利用 scope 將
Userdomain object 直接注入；這和 Law of Demeter 多少有點關係 #ril - The Future of Dependency Injection with Dagger 2 - YouTube (2016-01-04) https://www.youtube.com/watch?v=plK0zyRLIP8 13:00
TwitterModule的例子很有趣，因為需要一個 user name，所以要有一個明確的 constructor，這是把 (external) state 注入 graph 的方式。30:50 也提到定位在@Userscope 的TwitterComponent，可以在使用者登出時整個丟棄 (GC)，待下一個使用者登入時建立另一個TwitterComponent。 - Dependency injection with Dagger 2 - Custom scopes – froger_mcs dev blog – Coding with love (2015-07-01) http://frogermcs.github.io/dependency-injection-with-dagger-2-custom-scopes/ 在 application scope (
@Singleton) 與 activity scope (@ActivityScope) 中間增加一層 user scope (@UserScope)，方便直接從 constructor 注入User。
- Java dependency injection: Injecting domain objects instead of infrastructure components (2014-11-10) http://www.mscharhag.com/java/dependency-injection-domain-objects 利用 scope 將
- To “new” or not to “new”… (2008-09-30) http://misko.hevery.com/2008/09/30/to-new-or-not-to-new/ 提到 injectable 不透過 constructor 要求 newable，因為 DI framework 不知道要怎麼注入 (這跟好不好測無關)；但為什麼不是想辦法提供?? 因為這樣的需求確實存在
- http://stackoverflow.com/questions/37516736/ (2016-05-30) 討論到 "injectable factory" 及 "assisted injection"
- AssistedInject · google/guice Wiki https://github.com/google/guice/wiki/AssistedInject #ril
- Design for Testability and “Domain-Driven Design” http://misko.hevery.com/2009/03/16/design-for-testability-and-domain-driven-design/ 很明顯你不能說
injector.getInstance(CreditCard.class)，這是分辨 newable 與 injectable 的好方法，雖然injector.getInstance(HibernateSession.class).get(CreditCard.class, 123)這麼說也行，但中間透過 factory 又不算是 "fully injectable"。