io.reactivex.observable.extensions

Interface ScalarCallable<T>

Type Parameters:

T - the scalar value type held by the implementing reactive type

All Superinterfaces:

java.util.concurrent.Callable<T>

public interface ScalarCallable<T>
extends java.util.concurrent.Callable<T>

A marker interface indicating that a scalar, constant value is held by the implementing reactive type which can be safely extracted during assembly time can be used for optimization.

Implementors of call() should not throw any exception.

Design note: the interface extends Callable because if a scalar is safe to extract during assembly time, it is also safe to extract at subscription time or later. This allows optimizations to deal with such single-element sources uniformly.

Method Summary

Modifier and Type	Method and Description
T	call()

Method Detail

call

T call()

Specified by:

call in interface java.util.concurrent.Callable<T>