Package dev.webfx.platform.service

Class MultipleServiceProviders

java.lang.Object

dev.webfx.platform.service.MultipleServiceProviders

public final class MultipleServiceProviders
extends Object

Very simple utility class to get a list of providers. Its main benefit is that it keeps those lists in memory, so it will always return the same lists of unique providers instances, without instantiating them again on subsequent calls. This would not be the case with the standard ServiceLoader, which creates new providers instances on each call. So this utility class can be useful for pieces of code that need to refer to a list of providers several times, with the guarantee to have the same unique instances each time. By using this utility class, you spare the declaration of a field for storing your providers, and it can therefore be used even in interface default methods. Typical usage: private static List<MyProvider> getMyProviders() { return MultipleServiceProviders.getProviders(MyProvider.class, () -> ServiceLoader.load(MyProvider.class)); } Note: the reason why ServiceLoader.load() is written in the caller code and not in this utility class is to be compliant with the Java Platform Module System. The caller module has to declare in module-info.java that it's using this service, and only the caller code can ask the ServiceLoader to load this service, this utility class can't.

Author:

Bruno Salmon

Constructor Summary

Constructors

Constructor	Description
MultipleServiceProviders()

Method Summary

Modifier and Type	Method	Description
static <S> List<S>	getProviders(Class<S> serviceClass, Supplier<ServiceLoader<S>> serviceLoaderSupplier)

Methods inherited from class java.lang.Object

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

Constructor Details

MultipleServiceProviders

public MultipleServiceProviders()

Method Details

getProviders

public static <S> List<S> getProviders(Class<S> serviceClass,
 Supplier<ServiceLoader<S>> serviceLoaderSupplier)