11d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Copyright (C) 2008 The Guava Authors 31d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 41d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Licensed under the Apache License, Version 2.0 (the "License"); 51d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * you may not use this file except in compliance with the License. 61d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * You may obtain a copy of the License at 71d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 81d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * http://www.apache.org/licenses/LICENSE-2.0 91d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Unless required by applicable law or agreed to in writing, software 111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * distributed under the License is distributed on an "AS IS" BASIS, 121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * See the License for the specific language governing permissions and 141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * limitations under the License. 151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpackage com.google.common.testing; 181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.annotations.GwtCompatible; 201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.annotations.GwtIncompatible; 211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport junit.framework.TestCase; 231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.concurrent.Callable; 251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.concurrent.CountDownLatch; 261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.concurrent.ExecutorService; 271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.concurrent.Executors; 281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.concurrent.TimeUnit; 291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/** 311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Unit test for {@link FakeTicker}. 321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @author benyu@google.com (Jige Yu) 341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert@GwtCompatible(emulated = true) 361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpublic class FakeTickerTest extends TestCase { 371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public void testAdvance() { 391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert FakeTicker ticker = new FakeTicker(); 401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertEquals(0, ticker.read()); 411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertSame(ticker, ticker.advance(10)); 421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertEquals(10, ticker.read()); 431d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ticker.advance(1, TimeUnit.MILLISECONDS); 441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertEquals(1000010L, ticker.read()); 451d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @GwtIncompatible("concurrency") 481d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 491d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public void testConcurrentAdvance() throws Exception { 501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert final FakeTicker ticker = new FakeTicker(); 511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 521d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int numberOfThreads = 64; 531d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ExecutorService executorService = Executors.newFixedThreadPool(numberOfThreads); 541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert final CountDownLatch startLatch = new CountDownLatch(numberOfThreads); 551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert final CountDownLatch doneLatch = new CountDownLatch(numberOfThreads); 561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert for (int i = numberOfThreads; i > 0; i--) { 571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert executorService.submit(new Callable<Void>() { 581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public Void call() throws Exception { 601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // adds two nanoseconds to the ticker 611d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert startLatch.countDown(); 621d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert startLatch.await(); 631d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ticker.advance(1L); 641d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Thread.sleep(10); 651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ticker.advance(1L); 661d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert doneLatch.countDown(); 671d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 681d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 691d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert }); 701d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 711d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert doneLatch.await(); 721d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertEquals(numberOfThreads * 2, ticker.read()); 731d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 741d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert} 75