Dependency Injection

Mangoo I/O leverages Google Guice for dependency injection.

Injecting Dependencies

The simplest way to inject a dependency is by defining it as a member variable using the @Inject annotation:

@Inject
private MyClass myClass;

You can also obtain an instance of a class using the static method Application.getInstance():

MyClass myClass = Application.getInstance(MyClass.class);

The preferred approach for dependency injection is through the constructor, ensuring immutability and better testability:

private final Foo foo;

@Inject
public MyClass(Foo foo) {
    this.foo = Objects.requireNonNull(foo);
}

Constructor injection enforces dependency availability and prevents accidental modification of injected dependencies.

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