Package io.javago.sync

Class OnceValues<S,T>

java.lang.Object

io.javago.sync.OnceValues<S,T>

Type Parameters:

S - the type of the first value

T - the type of the second value

All Implemented Interfaces:

Supplier<OnceValues.Values<S,T>>

public class OnceValues<S,T>
extends Object
implements Supplier<OnceValues.Values<S,T>>

The OnceValues class implements Go's sync.OnceValues. A Supplier wrapper that ensures the wrapped Supplier is executed only once and returns a pair of values.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final record	OnceValues.Values<S,T>	A record that holds a pair of values.

Constructor Summary

Constructors

Constructor	Description
OnceValues(Supplier<OnceValues.Values<S,T>> supplier)	Constructs a new OnceValues that will wrap the given Supplier.

Method Summary

Modifier and Type	Method	Description
OnceValues.Values<S,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

OnceValues

public OnceValues(Supplier<OnceValues.Values<S,T>> supplier)

Constructs a new OnceValues that will wrap the given Supplier.

Parameters:

supplier - the Supplier to be wrapped and executed only once

Method Details

get

public OnceValues.Values<S,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<S>

Returns:

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