Package org.apache.logging.log4j.util

Class ServiceLoaderUtil

java.lang.Object

org.apache.logging.log4j.util.ServiceLoaderUtil

@InternalApi
public final class ServiceLoaderUtil
extends Object

An utility class to retrieve services in a safe way.

This class should be considered internal.

A common source of ServiceLoader failures, when running in a multi-classloader environment, is the presence of multiple classes with the same class name in the same classloader hierarchy. Since ServiceLoader retrieves services by class name, it is entirely possible that the registered services don't extend the required interface and cause an exception to be thrown by ServiceLoader.

The purpose of this class is to:

1. skip faulty services, allowing for a partial retrieval of the good ones,
2. allow to integrate other sources of services like OSGi services.

Since:

2.18.0

Method Summary

Modifier and Type	Method	Description
static <S> Stream<S>	safeStream(Class<S> serviceType, ServiceLoader<? extends S> serviceLoader, Logger logger)	Retrieves services registered with ServiceLoader

Methods inherited from class java.lang.Object

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

Method Details

safeStream

public static <S> Stream<S> safeStream(Class<S> serviceType,
 ServiceLoader<? extends S> serviceLoader,
 Logger logger)

Retrieves services registered with ServiceLoader

It ignores the most common service loading errors.

Parameters:

serviceType - The service type to use for OSGi service retrieval.

serviceLoader - The service loader instance to use.

logger - The logger to use to report service failures.

Returns:

A stream of all correctly loaded services.

Since:

2.24.0