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* release/3.6.x: Issue #431: Issue using SPI-enabled type systems embedded into PEARs Issue #431: Issue using SPI-enabled type systems embedded into PEARs Issue #431: Issue using SPI-enabled type systems embedded into PEARs Issue #431: Issue using SPI-enabled type systems embedded into PEARs Issue #431: Issue using SPI-enabled type systems embedded into PEARs Issue #431: Issue using SPI-enabled type systems embedded into PEARs
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uimaj-core/src/main/java/org/apache/uima/internal/util/ServiceLoaderUtil.java
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|---|---|---|
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
| package org.apache.uima.internal.util; | ||
|
|
||
| import java.lang.invoke.MethodHandles; | ||
| import java.util.Collection; | ||
| import java.util.Iterator; | ||
| import java.util.ServiceConfigurationError; | ||
| import java.util.ServiceLoader; | ||
| import java.util.Spliterator; | ||
| import java.util.function.Consumer; | ||
| import java.util.stream.Stream; | ||
| import java.util.stream.StreamSupport; | ||
|
|
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
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| public class ServiceLoaderUtil { | ||
| private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); | ||
| private static final int MAX_BROKEN_SERVICES = 16; | ||
|
|
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| public static <T> Stream<T> loadServicesSafely(Class<T> aService) { | ||
| var cl = ClassLoaderUtils.findClassLoader(); | ||
| return loadServicesSafely(aService, cl, null); | ||
| } | ||
|
|
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| public static <T> Stream<T> loadServicesSafely(Class<T> aService, ClassLoader aClassLoader) { | ||
| return loadServicesSafely(aService, aClassLoader, null); | ||
| } | ||
|
|
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| static <T> Stream<T> loadServicesSafely(Class<T> aService, ClassLoader aClassLoader, | ||
| Collection<Throwable> aErrorCollector) { | ||
| var loader = ServiceLoader.load(aService, aClassLoader); | ||
| return StreamSupport.stream( | ||
| new ServiceLoaderSpliterator<T>(aService, loader.iterator(), aErrorCollector), false); | ||
| } | ||
|
|
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| private static class ServiceLoaderSpliterator<T> implements Spliterator<T> { | ||
|
|
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| private final Logger log; | ||
| private final Iterator<T> serviceIterator; | ||
| private final Class<T> service; | ||
| private final Collection<Throwable> errorCollector; | ||
|
|
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| public ServiceLoaderSpliterator(Class<T> aService, Iterator<T> aIterator, | ||
| Collection<Throwable> aErrorCollector) { | ||
| serviceIterator = aIterator; | ||
| service = aService; | ||
| errorCollector = aErrorCollector; | ||
| log = aErrorCollector == null ? LOG : null; | ||
| } | ||
|
|
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| @Override | ||
| public boolean tryAdvance(final Consumer<? super T> aAction) { | ||
| int i = MAX_BROKEN_SERVICES; | ||
| while (i-- > 0) { | ||
| try { | ||
| if (serviceIterator.hasNext()) { | ||
| aAction.accept(serviceIterator.next()); | ||
| return true; | ||
| } | ||
| } catch (ServiceConfigurationError | LinkageError e) { | ||
| handle(e); | ||
| } catch (Throwable e) { | ||
| handle(e); | ||
| throw e; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
|
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| private void handle(Throwable e) { | ||
| if (log != null) { | ||
| log.warn("Unable to load service class for service {}", service, e); | ||
| } | ||
| if (errorCollector != null) { | ||
| errorCollector.add(e); | ||
| } | ||
| } | ||
|
|
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| @Override | ||
| public Spliterator<T> trySplit() { | ||
| return null; | ||
| } | ||
|
|
||
| @Override | ||
| public long estimateSize() { | ||
| return Long.MAX_VALUE; | ||
| } | ||
|
|
||
| @Override | ||
| public int characteristics() { | ||
| return NONNULL | IMMUTABLE; | ||
| } | ||
| } | ||
| } |
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