org.apache.reef.tang.annotations

Annotation Type Unit

@Target(value=TYPE)
@Retention(value=RUNTIME)
public @interface Unit

A TANG Unit consists of an outer class and some non-static inner classes. TANG injectors automatically treat all the classes in a unit as singletons.

In order to inject the singleton instance of each inner class, TANG first instantiates the outer class and then uses the resulting instance to instantiate each inner class.

Classes annotated in this way must have at least one non-static inner class and no static inner classes. The inner classes must not declare any constructors.

Furthermore, classes annotated with Unit may not have injectable (or Unit) subclasses.