/** Create a Transactional using a MR+SW (Multiple Reader AND a Single Writer) lock */ public static TransactionalLock createMRPlusSW() { return create(new LockMRPlusSW()) ; }
@Override public void leaveCriticalSection() { if (isHeldByCurrentThread()) unlock(); } }
@Override public void enterCriticalSection(final boolean readLockRequested) { if (!readLockRequested) lock(); }
@Test public void testOneWriterAtATime() throws InterruptedException { final Lock testLock = new LockMRPlusSW(); testLock.enterCriticalSection(false); final AtomicBoolean secondWriterHasLock = new AtomicBoolean(); // new writer defaultThreadFactory().newThread(() -> { testLock.enterCriticalSection(false); secondWriterHasLock.set(true); }).start(); sleep(5000); assertFalse("Multiple writers were allowed!", secondWriterHasLock.get()); }
@Override public void leaveCriticalSection() { if (isHeldByCurrentThread()) unlock(); } }
@Override public void enterCriticalSection(final boolean readLockRequested) { if (!readLockRequested) lock(); }
@Test public void testOneWriterAtATime() throws InterruptedException { final Lock testLock = new LockMRPlusSW(); testLock.enterCriticalSection(false); final AtomicBoolean secondWriterHasLock = new AtomicBoolean(); // new writer defaultThreadFactory().newThread(() -> { testLock.enterCriticalSection(false); secondWriterHasLock.set(true); }).start(); sleep(5000); assertFalse("Multiple writers were allowed!", secondWriterHasLock.get()); }
@Test public void testMultipleReadersAtATime() { final Lock testLock = new LockMRPlusSW(); testLock.enterCriticalSection(true); final AtomicBoolean secondReaderHasLock = new AtomicBoolean(); // new reader defaultThreadFactory().newThread(() -> { testLock.enterCriticalSection(true); secondReaderHasLock.set(true); }).start(); // the only way to fail is to timeout await().untilTrue(secondReaderHasLock); }
@Test public void testAWriterDoesNotBlockReaders() { final Lock testLock = new LockMRPlusSW(); testLock.enterCriticalSection(false); final AtomicBoolean readerHasLock = new AtomicBoolean(); // new reader defaultThreadFactory().newThread(() -> { testLock.enterCriticalSection(true); readerHasLock.set(true); }).start(); await().untilTrue(readerHasLock); } }
@Test public void testAWriterDoesNotBlockReaders() { final Lock testLock = new LockMRPlusSW(); testLock.enterCriticalSection(false); final AtomicBoolean readerHasLock = new AtomicBoolean(); // new reader defaultThreadFactory().newThread(() -> { testLock.enterCriticalSection(true); readerHasLock.set(true); }).start(); await().untilTrue(readerHasLock); } }
@Test public void testMultipleReadersAtATime() { final Lock testLock = new LockMRPlusSW(); testLock.enterCriticalSection(true); final AtomicBoolean secondReaderHasLock = new AtomicBoolean(); // new reader defaultThreadFactory().newThread(() -> { testLock.enterCriticalSection(true); secondReaderHasLock.set(true); }).start(); // the only way to fail is to timeout await().untilTrue(secondReaderHasLock); }