Module io.helidon.common

Package io.helidon.common

Interface LazyValue<T>

Type Parameters:

T - type of the provided object

All Superinterfaces:

Supplier<T>

public interface LazyValue<T>
extends Supplier<T>

A typed supplier that wraps another supplier and only retrieves the value on the first request to Supplier.get(), caching the value for all subsequent invocations.

Helidon implementations obtained through create(java.util.function.Supplier) and create(Object) are guaranteed to be thread safe.

Method Summary

Modifier and Type	Method	Description
static <T> LazyValue<T>	create(Supplier<T> supplier)	Create a lazy value from a supplier.
static <T> LazyValue<T>	create(T value)	Create a lazy value from a value.
boolean	isLoaded()	Return true if the value is loaded, false if the supplier was not invoked.

Methods inherited from interface java.util.function.Supplier

get

Method Detail

create

static <T> LazyValue<T> create(Supplier<T> supplier)

Create a lazy value from a supplier.

Type Parameters:

T - type of the value

Parameters:

supplier - supplier to get the value from

Returns:

a lazy value that will obtain the value from supplier on first call to Supplier.get()

create

static <T> LazyValue<T> create(T value)

Create a lazy value from a value.

Type Parameters:

T - type of the value

Parameters:

value - actual value to return

Returns:

a lazy value that will always return the value provided

isLoaded

boolean isLoaded()

Return true if the value is loaded, false if the supplier was not invoked.

Returns:

true if the value is loaded