| /* |
| * Copyright (c) 2021 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| // Contributors: |
| // Oracle - initial API and implementation |
| package org.eclipse.persistence.testing.tests.junit.helper; |
| |
| import java.util.concurrent.Semaphore; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.eclipse.persistence.internal.helper.ConcurrencySemaphore; |
| import org.junit.Assert; |
| |
| import static org.junit.Assert.assertTrue; |
| |
| public class ConcurrencySemaphoreThread implements Runnable { |
| |
| /** |
| * Semaphore related properties. |
| */ |
| private static final ThreadLocal<Boolean> SEMAPHORE_THREAD_LOCAL_VAR = new ThreadLocal<>(); |
| private static final int SEMAPHORE_MAX_NUMBER_THREADS = 12; |
| private static final Semaphore SEMAPHORE_LIMIT_MAX_NUMBER_OF_THREADS_IN_TEST = new Semaphore(SEMAPHORE_MAX_NUMBER_THREADS); |
| private ConcurrencySemaphore testSemaphore = new ConcurrencySemaphore(SEMAPHORE_THREAD_LOCAL_VAR, SEMAPHORE_MAX_NUMBER_THREADS, SEMAPHORE_LIMIT_MAX_NUMBER_OF_THREADS_IN_TEST, this, "object_builder_semaphore_acquired_01"); |
| |
| private static AtomicInteger currentNoOfThreads = new AtomicInteger(0); |
| |
| @Override |
| public void run() { |
| boolean semaphoreWasAcquired = false; |
| try { |
| //Semaphore call |
| semaphoreWasAcquired = testSemaphore.acquireSemaphoreIfAppropriate(true); |
| //Current No of threads there can't be more than SEMAPHORE_MAX_NUMBER_THREADS |
| assertTrue(currentNoOfThreads.incrementAndGet() <= SEMAPHORE_MAX_NUMBER_THREADS); |
| //Instead of some code which should take some time is there sleep. |
| Thread.sleep(300); |
| } catch (InterruptedException ex) { |
| Assert.fail("Semaphore Test thread was interrupted. Test failed to run properly"); |
| } finally { |
| currentNoOfThreads.decrementAndGet(); |
| testSemaphore.releaseSemaphoreAllowOtherThreadsToStartDoingObjectBuilding(semaphoreWasAcquired); |
| } |
| } |
| } |