Module io.helidon.builder.api

Package io.helidon.builder.api

Class BuilderSupport

java.lang.Object

io.helidon.builder.api.BuilderSupport

public final class BuilderSupport
extends Object

Static methods used from generated prototypes and builders.

This only contains methods that can be used without additional dependencies (i.e. ServiceLoader based).

Method Summary

Modifier and Type	Method	Description
static <C> Optional<C>	discoverService(Class<C> contract, boolean discoverServices, Optional<C> existingInstance)	Discover a service from ServiceLoader.
static <C> List<C>	discoverServices(Class<C> contract, boolean discoverServices, List<C> existingInstances)	Discover services from Java ServiceLoader.

Methods inherited from class java.lang.Object

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

Method Details

discoverServices

public static <C> List<C> discoverServices(Class<C> contract,
 boolean discoverServices,
 List<C> existingInstances)

Discover services from Java ServiceLoader. This method will only add instances of classes that are not already part of existingInstances.

Type Parameters:

C - type of the contract to use

Parameters:

contract - service contract (or provider interface as used in ServiceLoader)

discoverServices - whether to discover services from service loader, if set to false, service loader is ignored

existingInstances - instances already configured on the builder

Returns:

a list of new instances to add to the builder

discoverService

public static <C> Optional<C> discoverService(Class<C> contract,
 boolean discoverServices,
 Optional<C> existingInstance)

Discover a service from ServiceLoader. This method will only query the service loader if the existingInstance is empty.

Type Parameters:

C - type of the contract

Parameters:

contract - service contract (or provider interface as used in ServiceLoader)

discoverServices - whether to discover services from service loader, if set to false, service loader is ignored

existingInstance - an instance configured on the builder

Returns:

value to be used by the builder (either the existing instance, an instance from ServiceLoader, or empty if none found