Dependency Lookup at XUnitPatterns.com
The book has now been published and the content of this chapter has likely changed substanstially. Please see page 686 of xUnit Test Patterns for the latest information. Also known as: Service Locator, Object Factory, Component Broker, Component Registry How do we design the system under test (SUT) so that we can replace its dependencies at run time? The SUT asks another object to return the depen
DI コンテナがコードに出現するのは dependency lookup が行われている兆候
Dependency Injection (DI) コンテナを基盤にしたアーキテクチャを採用している場合に、(プロダクト|テスト)コードに DI コンテナが登場するのは dependency lookup (依存コンポーネントの検索)を行っている兆候と考えることが出来ます(もちろん必要があってコンテナの injection が行われている場合もあります)。 テストに DI コンテナが出現することに気付いたら、 Dependency lookup から Dependency Injection (DI) へのリファクタリングの契機とすることもできるでしょう。 続きを読む
DIP in the Wild
The Dependency Inversion Principle (DIP) has been around since the early '90s, even so it seems easy to forget in the middle of solving a problem. After a few definitions, I'll present a number of applications of the DIP I've personally used on real projects so you'll have some examples from which to form your own conclusions. 21 May 2013 Brett is a generalist striving to get the basics right. He'
Object Scoping: A Triste Against Service Containers
Yesterday, I got in an interesting conversation on twitter about object scopes and what constitutes a global scope. The discussion started around a piece of code that I stumbled upon from Fuel 2.0. I am a firm believer that service containers are not a form of Dependency Injection, and are only slightly better than global variables. That led me to make a few comments that elicited a reply from two
Why is IoC / DI not common in Python?
In Java IoC / DI is a very common practice which is extensively used in web applications, nearly all available frameworks and Java EE. On the other hand, there are also lots of big Python web applications, but beside of Zope (which I've heard should be really horrible to code) IoC doesn't seem to be very common in the Python world. (Please name some examples if you think that I'm wrong). There are
Dependency injection with Symfony 2
A presentation on getting to understand dependency injection as well as the service container in Symfony2Read less
Circular Dependency in constructors and Dependency Injection
by Miško Hevery So you discovered dependency injection and GUICE and you are happily refactoring and writing new tests for you code until you come across this circular reference. class A { final B b; A(B b){ this.b = b; } } class B { final A a; B(){ this.a = new A(this); } } +---------+ +---------+ | A |<-----| B | | | | | | |----->| | +---------+ +---------+ Hm, dependency injection says that you
DIコンテナの本当の使いどころ | ウルシステムズ株式会社
DI の自由度は諸刃の剣 近ごろ、「実プロジェクトでDIコンテナ（注1）を導入している」という話をちらほら耳にするようになりました。それと同時に、「DIコンテナを使ったプロジェクトが大変なことになっている」という話も耳にするようになりました。DIの魅力を十分に享受して低コスト、高品質を実現しているプロジェクトがある一方で「DIを導入してみたのはいいのだけれど、DIの設定ファイルが大きくなりすぎて管理しきれない」「DIを使っているのに、テスタビリティが全然向上していない」など苦労しているプロジェクトもあるようです。この差はいったいどこから来るのでしょうか。 DIは、EJBなどと比べると比較的取っ付きやすい技術ではありますが、ほかの技術同様、誤った使い方では十分に力を発揮できません。DIコンテナは非常に単純明快な技術ではありますが、そのシンプルさ故に自由度が高くさまざまな使い方ができます。その
実戦での Scala: Cake パターンを用いた Dependency Injection (DI) · eed3si9n
2011-04-23 Akka の作者として益々注目を集めている Jonas Bonér が 2008年に書いた “Real-World Scala: Dependency Injection (DI)” を翻訳しました。翻訳の公開は本人より許諾済みです。翻訳の間違い等があれば遠慮なくご指摘ください。 2008年10月6日 Jonas Bonér 著 2011年4月22日 eed3si9n 訳 さて、実戦での Scala シリーズ第二弾の今回は、Scala を用いた Depenency Injection (DI) の実装をみていきたい。Scala は、備わっている言語機構だけを用いても何通りかの DI を実現できる非常に豊かでディープな言語だが、必要に応じて既存の Java DI フレームワークを使うこともできる。 Triental では、一つの戦略に落ち着くまで三つの異なる方法を試した
Real-World Scala: Dependency Injection (DI)
Update: Corrected typo in the Cake Pattern version of the last example. Update: Added a version of the last example using the Cake Pattern for easier comparison (see end of post). In this second post in the Real-World Scala series I am going to discuss how to implement/achieve Depenency Injection (DI) in Scala. Scala is a very rich and deep language that gives you several ways of doing DI solely
Is Dependency Injection Replacing the Factory Patterns?
Is Dependency Injection Replacing the Factory Patterns? Dependency Injection (DI) has been a hot topic since at least 2003 and onwards. Lots of dependency injection frameworks have appeared (including my own Butterfly DI Container), and lots of forums and blogs has discussed the technique. Yet I still experience big enterprise software development departments, who have not yet embraced the idea. I
Do it Yourself – Dependency Injection
A friend of mine has put together a set of documents which talk about do-it-yourself dependency-inject. Being that I am a fan of DI and how it helps with testability I wanted to share it with you. It is a good read for anyone interested in getting better at DI. by Chad Parry I want to evangelize this technique so that people know a lightweight way they can adopt DI. I think we need to refine the d
Dependency-Injection and JavaScript closures
As you can tell I am a big fan of DI, but I kept hearing that DI is not needed with dynamic languages, so after using JS for many months I am happy to say that DI is important there as well. In other words dependency managment and controll matters. But it is different. Say you have a class for greeting with DI. class Greeter { String greeting; Greeter(String greeting) { this.greeting = greeting; }
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This page has moved to /2010/02/03/ServiceLocatorisanAnti-Pattern.
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