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 Details

    • 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