This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
public static interface SendableBuilder.BooleanConsumer
Represents an operation that accepts a single boolean-valued argument and
returns no result. This is the primitive type specialization of Consumer
for boolean. Unlike most other functional interfaces, BooleanConsumer is
expected to operate via side-effects.
This is a functional interface whose functional method is accept(boolean).