Package org.opencastproject.util

Class NeedleEye

java.lang.Object

org.opencastproject.util.NeedleEye

public final class NeedleEye
extends Object

Only one function application can be threaded through the needle eye at a time.

Constructor Summary

Constructors

Constructor	Description
NeedleEye()

Method Summary

Modifier and Type	Method	Description
<A> Option<A>	apply(Function0<A> f)	Apply function f only if no other thread currently applies a function using this needle eye.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

NeedleEye

public NeedleEye()

Method Details

apply

public <A> Option<A> apply(Function0<A> f)

Apply function f only if no other thread currently applies a function using this needle eye. Please note that f must not return null, so please do not use Effect0.

Returns:

the result of f or none if another function is currently being applied.