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/*
* 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());
}
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());
}
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());
}
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") // https://errorprone.info/bugpattern/FutureReturnValueIgnored
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();
}
}
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