| /* |
| * 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.logging.log4j.util; |
| |
| import org.junit.jupiter.api.Tag; |
| import org.junit.jupiter.api.Test; |
| import org.junit.jupiter.api.parallel.ResourceLock; |
| import org.junit.jupiter.api.parallel.Resources; |
| |
| import java.util.Properties; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| |
| /** |
| * Tests https://issues.apache.org/jira/browse/LOG4J2-2276. |
| */ |
| @Tag("concurrency") |
| @ResourceLock(Resources.SYSTEM_PROPERTIES) |
| public class SystemPropertiesPropertySourceTest { |
| |
| private static final int ITERATIONS = 10000; |
| |
| /** |
| * Tests avoiding a ConcurrentModificationException. For example: |
| * |
| * <pre> |
| * java.util.ConcurrentModificationException |
| * at java.util.Hashtable$Enumerator.next(Hashtable.java:1167) |
| * at org.apache.logging.log4j.util.SystemPropertiesPropertySource.forEach(SystemPropertiesPropertySource.java:38) |
| * at org.apache.logging.log4j.util.SystemPropertiesPropertySourceTest.testMultiThreadedAccess(SystemPropertiesPropertySourceTest.java:47) |
| * </pre> |
| * @throws InterruptedException |
| * @throws ExecutionException |
| */ |
| @Test |
| public void testMultiThreadedAccess() throws InterruptedException, ExecutionException { |
| ExecutorService threadPool = Executors.newSingleThreadExecutor(); |
| try { |
| Future<?> future = threadPool.submit(() -> { |
| final Properties properties = System.getProperties(); |
| for (int i = 0; i < ITERATIONS; i++) { |
| properties.setProperty("FOO_" + i, "BAR"); |
| } |
| }); |
| for (int i = 0; i < ITERATIONS; i++) |
| new SystemPropertiesPropertySource().forEach((key, value) -> { |
| // nothing |
| }); |
| future.get(); |
| } finally { |
| threadPool.shutdown(); |
| } |
| } |
| |
| } |