Package io.javago.sync

Class OnceValue<T>

java.lang.Object

io.javago.sync.OnceValue<T>

Type Parameters:

T - the type of results supplied by this supplier

All Implemented Interfaces:

Supplier<T>

public class OnceValue<T>
extends Object
implements Supplier<T>

The OnceValue class implements Go's sync.OnceValue. A Supplier wrapper that ensures the wrapped Supplier is executed only once.

Constructor Summary

Constructors

Constructor	Description
OnceValue(Supplier<T> func)	Constructs a new OnceValue that will wrap the given Supplier.

Method Summary

Modifier and Type	Method	Description
T	get()	Executes the wrapped Supplier only once.

Methods inherited from class java.lang.Object

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

Constructor Details

OnceValue

public OnceValue(Supplier<T> func)

Constructs a new OnceValue that will wrap the given Supplier.

Parameters:

func - the Supplier to be wrapped and executed only once

Method Details

get

public T get()

Executes the wrapped Supplier only once. If this method is called multiple times, the wrapped Supplier will only be executed the first time and its result will be returned. Subsequent calls will return null.

Specified by:

get in interface Supplier<T>

Returns:

the result supplied by the wrapped Supplier on its first execution, or null on subsequent calls