| /* |
| * Copyright (C) 2008 The Guava Authors |
| * |
| * Licensed 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 com.google.common.testing; |
| |
| import com.google.common.annotations.GwtCompatible; |
| import com.google.common.annotations.GwtIncompatible; |
| import java.util.EnumSet; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.TimeUnit; |
| import junit.framework.TestCase; |
| |
| /** |
| * Unit test for {@link FakeTicker}. |
| * |
| * @author Jige Yu |
| */ |
| @GwtCompatible(emulated = true) |
| public class FakeTickerTest extends TestCase { |
| |
| @GwtIncompatible // NullPointerTester |
| public void testNullPointerExceptions() { |
| NullPointerTester tester = new NullPointerTester(); |
| tester.testAllPublicInstanceMethods(new FakeTicker()); |
| } |
| |
| @GwtIncompatible // java.time.Duration |
| public void testAdvance() { |
| FakeTicker ticker = new FakeTicker(); |
| assertEquals(0, ticker.read()); |
| assertSame(ticker, ticker.advance(10)); |
| assertEquals(10, ticker.read()); |
| ticker.advance(1, TimeUnit.MILLISECONDS); |
| assertEquals(1000010L, ticker.read()); |
| ticker.advance(java.time.Duration.ofMillis(1)); |
| assertEquals(2000010L, ticker.read()); |
| } |
| |
| public void testAutoIncrementStep_returnsSameInstance() { |
| FakeTicker ticker = new FakeTicker(); |
| assertSame(ticker, ticker.setAutoIncrementStep(10, TimeUnit.NANOSECONDS)); |
| } |
| |
| public void testAutoIncrementStep_nanos() { |
| FakeTicker ticker = new FakeTicker().setAutoIncrementStep(10, TimeUnit.NANOSECONDS); |
| assertEquals(0, ticker.read()); |
| assertEquals(10, ticker.read()); |
| assertEquals(20, ticker.read()); |
| } |
| |
| public void testAutoIncrementStep_millis() { |
| FakeTicker ticker = new FakeTicker().setAutoIncrementStep(1, TimeUnit.MILLISECONDS); |
| assertEquals(0, ticker.read()); |
| assertEquals(1000000, ticker.read()); |
| assertEquals(2000000, ticker.read()); |
| } |
| |
| public void testAutoIncrementStep_seconds() { |
| FakeTicker ticker = new FakeTicker().setAutoIncrementStep(3, TimeUnit.SECONDS); |
| assertEquals(0, ticker.read()); |
| assertEquals(3000000000L, ticker.read()); |
| assertEquals(6000000000L, ticker.read()); |
| } |
| |
| @GwtIncompatible // java.time.Duration |
| public void testAutoIncrementStep_duration() { |
| FakeTicker ticker = new FakeTicker().setAutoIncrementStep(java.time.Duration.ofMillis(1)); |
| assertEquals(0, ticker.read()); |
| assertEquals(1000000, ticker.read()); |
| assertEquals(2000000, ticker.read()); |
| } |
| |
| public void testAutoIncrementStep_resetToZero() { |
| FakeTicker ticker = new FakeTicker().setAutoIncrementStep(10, TimeUnit.NANOSECONDS); |
| assertEquals(0, ticker.read()); |
| assertEquals(10, ticker.read()); |
| assertEquals(20, ticker.read()); |
| |
| for (TimeUnit timeUnit : EnumSet.allOf(TimeUnit.class)) { |
| ticker.setAutoIncrementStep(0, timeUnit); |
| assertEquals( |
| "Expected no auto-increment when setting autoIncrementStep to 0 " + timeUnit, |
| 30, |
| ticker.read()); |
| } |
| } |
| |
| public void testAutoIncrement_negative() { |
| FakeTicker ticker = new FakeTicker(); |
| try { |
| ticker.setAutoIncrementStep(-1, TimeUnit.NANOSECONDS); |
| fail("Expected IllegalArgumentException"); |
| } catch (IllegalArgumentException expected) { |
| } |
| } |
| |
| @GwtIncompatible // concurrency |
| |
| public void testConcurrentAdvance() throws Exception { |
| final FakeTicker ticker = new FakeTicker(); |
| |
| int numberOfThreads = 64; |
| runConcurrentTest( |
| numberOfThreads, |
| new Callable<Void>() { |
| @Override |
| public Void call() throws Exception { |
| // adds two nanoseconds to the ticker |
| ticker.advance(1L); |
| Thread.sleep(10); |
| ticker.advance(1L); |
| return null; |
| } |
| }); |
| |
| assertEquals(numberOfThreads * 2, ticker.read()); |
| } |
| |
| @GwtIncompatible // concurrency |
| |
| public void testConcurrentAutoIncrementStep() throws Exception { |
| int incrementByNanos = 3; |
| final FakeTicker ticker = |
| new FakeTicker().setAutoIncrementStep(incrementByNanos, TimeUnit.NANOSECONDS); |
| |
| int numberOfThreads = 64; |
| runConcurrentTest( |
| numberOfThreads, |
| new Callable<Void>() { |
| @Override |
| public Void call() throws Exception { |
| ticker.read(); |
| return null; |
| } |
| }); |
| |
| assertEquals(incrementByNanos * numberOfThreads, ticker.read()); |
| } |
| |
| /** Runs {@code callable} concurrently {@code numberOfThreads} times. */ |
| @GwtIncompatible // concurrency |
| private void runConcurrentTest(int numberOfThreads, final Callable<Void> callable) |
| throws Exception { |
| ExecutorService executorService = Executors.newFixedThreadPool(numberOfThreads); |
| final CountDownLatch startLatch = new CountDownLatch(numberOfThreads); |
| final CountDownLatch doneLatch = new CountDownLatch(numberOfThreads); |
| for (int i = numberOfThreads; i > 0; i--) { |
| @SuppressWarnings("unused") // go/futurereturn-lsc |
| Future<?> possiblyIgnoredError = |
| executorService.submit( |
| new Callable<Void>() { |
| @Override |
| public Void call() throws Exception { |
| startLatch.countDown(); |
| startLatch.await(); |
| callable.call(); |
| doneLatch.countDown(); |
| return null; |
| } |
| }); |
| } |
| doneLatch.await(); |
| } |
| } |