BAEL-4472 - old file removed
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package com.baeldung.binarysemaphorereentrantlock;
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import static org.junit.Assert.assertEquals;
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import java.util.concurrent.Semaphore;
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import java.util.concurrent.locks.ReentrantLock;
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import org.junit.Test;
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public class BinarySemaphoreVsReentrantLockUnitTest {
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@Test
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public void givenBinarySemaphore_whenAcquireAndRelease_thenCheckAvailablePermits() throws InterruptedException {
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Semaphore binarySemaphore = new Semaphore(1);
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try {
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binarySemaphore.acquire();
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assertEquals(0, binarySemaphore.availablePermits());
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} catch (InterruptedException e) {
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e.printStackTrace();
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} finally {
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binarySemaphore.release();
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assertEquals(1, binarySemaphore.availablePermits());
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}
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}
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@Test
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public void givenReentrantLock_whenLockAndUnlock_thenCheckHoldCountAndIsLocked() throws InterruptedException {
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ReentrantLock reentrantLock = new ReentrantLock();
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try {
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reentrantLock.lock();
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assertEquals(1, reentrantLock.getHoldCount());
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assertEquals(true, reentrantLock.isLocked());
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} finally {
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reentrantLock.unlock();
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assertEquals(0, reentrantLock.getHoldCount());
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assertEquals(false, reentrantLock.isLocked());
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}
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}
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@Test
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public void givenReentrantLock_whenLockMultipleTimes_thenUnlockMultipleTimesToRelease() throws InterruptedException {
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ReentrantLock reentrantLock = new ReentrantLock();
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try {
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reentrantLock.lock();
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reentrantLock.lock();
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assertEquals(2, reentrantLock.getHoldCount());
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assertEquals(true, reentrantLock.isLocked());
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} finally {
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reentrantLock.unlock();
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assertEquals(1, reentrantLock.getHoldCount());
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assertEquals(true, reentrantLock.isLocked());
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reentrantLock.unlock();
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assertEquals(0, reentrantLock.getHoldCount());
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assertEquals(false, reentrantLock.isLocked());
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}
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}
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}
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