@Override
                    public boolean isReleasable() {
                        return result != NULL;
                    }
A factory class for methods that wrap functional interfaces like
{@link Supplier} in a "blocking" ({@link ManagedBlocker}) equivalent, which
can be used with the {@link ForkJoinPool}.

@author Lukas Eder
jOOL-java-8/src/main/java/org/jooq/lambda/Blocking.java