Module org.elasticsearch.server

Package org.elasticsearch.plugins

Class ExtensionLoader

java.lang.Object

org.elasticsearch.plugins.ExtensionLoader

public class ExtensionLoader
extends Object

A utility for loading SPI extensions.

Constructor Summary

Constructors

Constructor	Description
ExtensionLoader()

Method Summary

Modifier and Type	Method	Description
static <T> Optional<T>	loadSingleton(ServiceLoader<T> loader)	Loads a single SPI extension.

Methods inherited from class java.lang.Object

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

Constructor Details

ExtensionLoader

public ExtensionLoader()

Method Details

loadSingleton

public static <T> Optional<T> loadSingleton(ServiceLoader<T> loader)

Loads a single SPI extension. There should be no more than one extension found. Note: A ServiceLoader is needed rather than the service class because ServiceLoaders must be loaded by a module with the uses declaration. Since this utility class is in server, it will not have uses (or even know about) all the service classes it may load. Thus, the caller must load the ServiceLoader.

Type Parameters:

T - the SPI extension type

Parameters:

loader - a service loader instance to find the singleton extension in

Returns:

an instance of the extension