Interface PythonFunctionalInterfaceProvider

@Internal public interface PythonFunctionalInterfaceProvider
The functional interfaces the Python compiler found in the Java types the Python sources reference: the host access converts a Python callable to each of them by the arity of the callable, so that a Java method overloaded on functional interfaces, or on a functional interface and Iterable, is called with a plain lambda (see PythonCallables).

The compiler generates an implementation per compilation, a singleton bean that is also registered as a service, naming the functional interfaces the referenced Java types (imported types, Java bases of Python classes, type hints) accept as method parameters, the interfaces accepted by the methods of the types those methods return, and the referenced types that are functional interfaces themselves. A functional interface is an interface annotated with FunctionalInterface or, outside the JDK, an interface with a single abstract method.

Since:
5.2.4

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Interface
    Description
    static final record 
    PythonFunctionalInterfaceProvider.Entry
    A functional interface, named rather than referenced: an interface of a compile-time only dependency is absent at run time, and the host access skips an entry it cannot load instead of failing with the Python context.

  • Method Summary

    Modifier and Type
    Method
    Description
    List<PythonFunctionalInterfaceProvider.Entry>
    entries()