What are the benefits of dependency injection?
Advantages. A basic benefit of dependency injection is decreased coupling between classes and their dependencies. By removing a client’s knowledge of how its dependencies are implemented, programs become more reusable, testable and maintainable.
What are the disadvantages of dependency injection?
Disadvantages of Dependency Injection:
- Dependency injection creates clients that demand configuration details to be supplied by construction code.
- Dependency injection can make code difficult to trace (read) because it separates behaviour from construction.
- It requires more upfront development effort.
What is dependency relationship with example?
Example. In an e-commerce application, a Cart class depends on a Product class because the Cart class uses the Product class as a parameter for an add operation. In a class diagram, a dependency relationship points from the Cart class to the Product class.
How does Magento determine which dependencies to inject?
Magento uses the di.xml file to determine which implementations to inject into the Builder class. Optional dependencies are objects that your class uses for specific methods and scenarios. If a class is expensive to instantiate and your class does not always use it, consider using a proxy.
What do you need to know about dependency injection?
Dependency Injection is a design pattern that allows an object A to declare its dependencies to an external object B that supplies those dependencies. The dependencies declared by A are usually class interfaces and the dependencies B provides are concrete implementations for those interfaces.
What does the objectmanager do in Magento 2?
The ObjectManager is a Magento service class that instantiates objects at the beginning of the bootstrapping process. Magento uses class constructor signatures to retrieve information about an object’s constructor dependencies.
Why do you need an interface in Magento?
Using interfaces in your code reduces the risk of incompatibility bugs when Magento changes the underlying implementation of those interfaces. It also lets you focus on what a class does instead of how its implemented.