| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.hadoop.util; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.util.concurrent.atomic.AtomicLong; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| |
| import org.junit.Rule; |
| import org.junit.Test; |
| import org.junit.rules.TestName; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A test class for InstrumentedReadLock and InstrumentedWriteLock. |
| */ |
| public class TestInstrumentedReadWriteLock { |
| |
| static final Logger LOG = LoggerFactory.getLogger( |
| TestInstrumentedReadWriteLock.class); |
| |
| @Rule |
| public TestName name = new TestName(); |
| |
| /** |
| * Tests exclusive access of the write lock. |
| * @throws Exception |
| */ |
| @Test(timeout=10000) |
| public void testWriteLock() throws Exception { |
| String testname = name.getMethodName(); |
| final ThreadLocal<Boolean> locked = new ThreadLocal<Boolean>(); |
| locked.set(Boolean.FALSE); |
| InstrumentedReadWriteLock readWriteLock = new InstrumentedReadWriteLock( |
| true, testname, LOG, 2000, 300); |
| final AutoCloseableLock writeLock = new AutoCloseableLock( |
| readWriteLock.writeLock()) { |
| @Override |
| public AutoCloseableLock acquire() { |
| AutoCloseableLock lock = super.acquire(); |
| locked.set(Boolean.TRUE); |
| return lock; |
| } |
| |
| @Override |
| public void release() { |
| super.release(); |
| locked.set(Boolean.FALSE); |
| } |
| }; |
| final AutoCloseableLock readLock = new AutoCloseableLock( |
| readWriteLock.readLock()); |
| try (AutoCloseableLock lock = writeLock.acquire()) { |
| Thread competingWriteThread = new Thread() { |
| @Override |
| public void run() { |
| assertFalse(writeLock.tryLock()); |
| } |
| }; |
| competingWriteThread.start(); |
| competingWriteThread.join(); |
| Thread competingReadThread = new Thread() { |
| @Override |
| public void run() { |
| assertFalse(readLock.tryLock()); |
| }; |
| }; |
| competingReadThread.start(); |
| competingReadThread.join(); |
| } |
| assertFalse(locked.get()); |
| locked.remove(); |
| } |
| |
| /** |
| * Tests the read lock. |
| * @throws Exception |
| */ |
| @Test(timeout=10000) |
| public void testReadLock() throws Exception { |
| String testname = name.getMethodName(); |
| InstrumentedReadWriteLock readWriteLock = new InstrumentedReadWriteLock( |
| true, testname, LOG, 2000, 300); |
| final AutoCloseableLock readLock = new AutoCloseableLock( |
| readWriteLock.readLock()); |
| final AutoCloseableLock writeLock = new AutoCloseableLock( |
| readWriteLock.writeLock()); |
| try (AutoCloseableLock lock = readLock.acquire()) { |
| Thread competingReadThread = new Thread() { |
| @Override |
| public void run() { |
| assertTrue(readLock.tryLock()); |
| readLock.release(); |
| } |
| }; |
| competingReadThread.start(); |
| competingReadThread.join(); |
| Thread competingWriteThread = new Thread() { |
| @Override |
| public void run() { |
| assertFalse(writeLock.tryLock()); |
| } |
| }; |
| competingWriteThread.start(); |
| competingWriteThread.join(); |
| } |
| } |
| |
| /** |
| * Tests the warning when the read lock is held longer than threshold. |
| * @throws Exception |
| */ |
| @Test(timeout=10000) |
| public void testReadLockLongHoldingReport() throws Exception { |
| String testname = name.getMethodName(); |
| final AtomicLong time = new AtomicLong(0); |
| Timer mclock = new Timer() { |
| @Override |
| public long monotonicNow() { |
| return time.get(); |
| } |
| }; |
| |
| final AtomicLong wlogged = new AtomicLong(0); |
| final AtomicLong wsuppresed = new AtomicLong(0); |
| ReentrantReadWriteLock readWriteLock = new ReentrantReadWriteLock(true); |
| InstrumentedReadLock readLock = new InstrumentedReadLock(testname, LOG, |
| readWriteLock, 2000, 300, mclock) { |
| @Override |
| protected void logWarning(long lockHeldTime, long suppressed) { |
| wlogged.incrementAndGet(); |
| wsuppresed.set(suppressed); |
| } |
| }; |
| |
| readLock.lock(); // t = 0 |
| time.set(100); |
| readLock.unlock(); // t = 100 |
| assertEquals(0, wlogged.get()); |
| assertEquals(0, wsuppresed.get()); |
| |
| readLock.lock(); // t = 100 |
| time.set(500); |
| readLock.unlock(); // t = 500 |
| assertEquals(1, wlogged.get()); |
| assertEquals(0, wsuppresed.get()); |
| |
| // the suppress counting is only changed when |
| // log is needed in the test |
| readLock.lock(); // t = 500 |
| time.set(900); |
| readLock.unlock(); // t = 900 |
| assertEquals(1, wlogged.get()); |
| assertEquals(0, wsuppresed.get()); |
| |
| readLock.lock(); // t = 900 |
| time.set(3000); |
| readLock.unlock(); // t = 3000 |
| assertEquals(2, wlogged.get()); |
| assertEquals(1, wsuppresed.get()); |
| } |
| |
| /** |
| * Tests the warning when the write lock is held longer than threshold. |
| * @throws Exception |
| */ |
| @Test(timeout=10000) |
| public void testWriteLockLongHoldingReport() throws Exception { |
| String testname = name.getMethodName(); |
| final AtomicLong time = new AtomicLong(0); |
| Timer mclock = new Timer() { |
| @Override |
| public long monotonicNow() { |
| return time.get(); |
| } |
| }; |
| |
| final AtomicLong wlogged = new AtomicLong(0); |
| final AtomicLong wsuppresed = new AtomicLong(0); |
| ReentrantReadWriteLock readWriteLock = new ReentrantReadWriteLock(true); |
| InstrumentedWriteLock writeLock = new InstrumentedWriteLock(testname, LOG, |
| readWriteLock, 2000, 300, mclock) { |
| @Override |
| protected void logWarning(long lockHeldTime, long suppressed) { |
| wlogged.incrementAndGet(); |
| wsuppresed.set(suppressed); |
| } |
| }; |
| |
| writeLock.lock(); // t = 0 |
| time.set(100); |
| writeLock.unlock(); // t = 100 |
| assertEquals(0, wlogged.get()); |
| assertEquals(0, wsuppresed.get()); |
| |
| writeLock.lock(); // t = 100 |
| time.set(500); |
| writeLock.unlock(); // t = 500 |
| assertEquals(1, wlogged.get()); |
| assertEquals(0, wsuppresed.get()); |
| |
| // the suppress counting is only changed when |
| // log is needed in the test |
| writeLock.lock(); // t = 500 |
| time.set(900); |
| writeLock.unlock(); // t = 900 |
| assertEquals(1, wlogged.get()); |
| assertEquals(0, wsuppresed.get()); |
| |
| writeLock.lock(); // t = 900 |
| time.set(3000); |
| writeLock.unlock(); // t = 3000 |
| assertEquals(2, wlogged.get()); |
| assertEquals(1, wsuppresed.get()); |
| } |
| } |