57th: Scala Dependency Injection in-depth practical explanation

We're going to learn the next dependency injection. Let's start with the code:

Package Scala.learn

Trait Logger {def log (msg:string)}
Trait Auth {
Auth:logger =
Def Act (msg:string) {
Log (msg)
}
}

Object DI extends Auth with Logger {
Override def log (msg:string) = println (msg)
}

Object test57{
def main (args:array[string]) {
Di.act ("I hope you'll like it")
}
}

First, define a trait, which is the structure type.

Then define another trait, its this pointer alias is auth, and specify mixed logger traits. In this way, the pair that inherits the Auth trait must also be mixed with the logger trait, and must have a string type parameter.

Then, define a singleton pair like Di, which inherits from Auth and mixes the logger trait, so the pair is like a logger type with a string type argument, and it overrides the log method.

In this way, the pair like di can normally invoke the Act method in the Auth method, and the Act method invokes the rewritten log method, which eventually prints the MSG.

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57th: Scala Dependency Injection in-depth practical explanation