io.jsonwebtoken.impl.lang

Class Services

java.lang.Object

io.jsonwebtoken.impl.lang.Services

public final class Services
extends Object

Helper class for loading services from the classpath, using a ServiceLoader. Decouples loading logic for better separation of concerns and testability.

Method Summary

Methods

Modifier and Type	Method and Description
static <T> List<T>	loadAll(Class<T> spi) Loads and instantiates all service implementation of the given SPI class and returns them as a List.
static <T> T	loadFirst(Class<T> spi) Loads the first available implementation the given SPI class from the classpath.

Methods inherited from class java.lang.Object

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

Method Detail

loadAll

public static <T> List<T> loadAll(Class<T> spi)

Loads and instantiates all service implementation of the given SPI class and returns them as a List.

Type Parameters:

T - The type of the SPI

Parameters:

spi - The class of the Service Provider Interface

Returns:

An unmodifiable list with an instance of all available implementations of the SPI. No guarantee is given on the order of implementations, if more than one.

loadFirst

public static <T> T loadFirst(Class<T> spi)

Loads the first available implementation the given SPI class from the classpath. Uses the ServiceLoader to find implementations. When multiple implementations are available it will return the first one that it encounters. There is no guarantee with regard to ordering.

Type Parameters:

T - The type of the SPI

Parameters:

spi - The class of the Service Provider Interface

Returns:

A new instance of the service.

Throws:

UnavailableImplementationException - When no implementation the SPI is available on the classpath.