org.opencastproject.util.data

Class Lazy<A>

java.lang.Object

org.opencastproject.util.data.Lazy<A>

public final class Lazy<A>
extends Object

The value of a lazy is calculated on first access.

Implementation note

The calculation is not synchronized for performance reasons. As a trade off the value may be calculated multiple times if many threads concurrently access the lazy in uninitialized state. Since f is expected to be a pure function this is not a serious problem despite the fact that calculation may happens multiple times.

Constructor Summary

Constructors

Constructor and Description
Lazy(Function0<A> f) Create a new lazy value.

Method Summary

Modifier and Type	Method and Description
static <A> Lazy<A>	lazy(Function0<A> f)
A	value()

Methods inherited from class java.lang.Object

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

Constructor Detail

Lazy

public Lazy(Function0<A> f)

Create a new lazy value.

Parameters:

f - a pure, referentially transparent function returning the lazy's value

Method Detail

lazy

public static <A> Lazy<A> lazy(Function0<A> f)

value

public A value()