| /* |
| * 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.openide.util; |
| |
| import java.util.concurrent.CountDownLatch; |
| import org.netbeans.junit.NbTestCase; |
| import org.openide.util.Exceptions; |
| |
| /** |
| * |
| * @author Jaroslav Tulach <jtulach@netbeans.org> |
| */ |
| public class MutexTryTest extends NbTestCase { |
| private Mutex.Privileged p; |
| private Mutex m; |
| |
| public MutexTryTest(String name) { |
| super(name); |
| } |
| |
| @Override |
| protected void setUp() throws Exception { |
| p = new Mutex.Privileged(); |
| m = new Mutex(p); |
| } |
| |
| @Override |
| protected int timeOut() { |
| return 10000; |
| } |
| |
| public void testTimeOutTryRead() throws Exception { |
| Block b = new Block(p, false); |
| b.block(); |
| |
| long now = System.currentTimeMillis(); |
| boolean res = p.tryReadAccess(1000); |
| long then = System.currentTimeMillis(); |
| |
| long delay = then - now; |
| |
| assertFalse("Locking has not succeeded", res); |
| assertFalse("No read lock held", m.isReadAccess()); |
| assertFalse("No write lock held", m.isWriteAccess()); |
| |
| assertTrue("Delay is 1s, was: " + delay + " ms", delay > 900); |
| } |
| |
| public void testSuccessfulTryRead() throws Exception { |
| Block b = new Block(p, true); |
| b.block(); |
| |
| boolean res = p.tryReadAccess(1000); |
| |
| assertTrue("Locking has succeeded", res); |
| assertTrue("read lock held", m.isReadAccess()); |
| assertFalse("No write lock held", m.isWriteAccess()); |
| } |
| |
| public void testTimeOutTryWrite() throws Exception { |
| Block b = new Block(p, false); |
| b.block(); |
| |
| long now = System.currentTimeMillis(); |
| boolean res = p.tryWriteAccess(1000); |
| long then = System.currentTimeMillis(); |
| |
| long delay = then - now; |
| |
| assertFalse("Locking has not succeeded", res); |
| assertFalse("No read lock held", m.isReadAccess()); |
| assertFalse("No write lock held", m.isWriteAccess()); |
| |
| assertTrue("Delay is 1s, was: " + delay + " ms", delay > 900); |
| } |
| |
| public void testSuccessfulTryWrite() throws Exception { |
| boolean res = p.tryWriteAccess(1000); |
| assertTrue("Access granted", res); |
| assertFalse("No read lock held", m.isReadAccess()); |
| assertTrue("Write lock held", m.isWriteAccess()); |
| } |
| |
| |
| private static class Block implements Runnable { |
| private final Mutex.Privileged p; |
| private final boolean read; |
| private final CountDownLatch runs = new CountDownLatch(1); |
| |
| Block(Mutex.Privileged p, boolean read) { |
| this.p = p; |
| this.read = read; |
| } |
| |
| void block() throws InterruptedException { |
| Thread t = new Thread(this, "Block mutex"); |
| t.start(); |
| runs.await(); |
| } |
| |
| @Override |
| public synchronized void run() { |
| if (read) { |
| p.enterReadAccess(); |
| } else { |
| p.enterWriteAccess(); |
| } |
| runs.countDown(); |
| for (;;) { |
| try { |
| wait(); |
| } catch (InterruptedException ex) { |
| Exceptions.printStackTrace(ex); |
| } |
| } |
| } |
| |
| } |
| } |