198 lines
7.0 KiB
Java
198 lines
7.0 KiB
Java
/*
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* Copyright 2017 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.util;
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import io.netty.util.internal.SystemPropertyUtil;
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import org.junit.Test;
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import java.util.concurrent.BrokenBarrierException;
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import java.util.concurrent.CyclicBarrier;
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import java.util.concurrent.atomic.AtomicReference;
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import static org.hamcrest.Matchers.containsString;
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import static org.hamcrest.Matchers.equalTo;
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import static org.hamcrest.Matchers.hasToString;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertNull;
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import static org.junit.Assert.assertThat;
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import static org.junit.Assert.fail;
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public class NettyRuntimeTests {
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@Test
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public void testIllegalSet() {
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final NettyRuntime.AvailableProcessorsHolder holder = new NettyRuntime.AvailableProcessorsHolder();
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for (final int i : new int[] { -1, 0 }) {
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try {
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holder.setAvailableProcessors(i);
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fail();
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} catch (final IllegalArgumentException e) {
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assertThat(e, hasToString(containsString("(expected: > 0)")));
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}
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}
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}
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@Test
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public void testMultipleSets() {
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final NettyRuntime.AvailableProcessorsHolder holder = new NettyRuntime.AvailableProcessorsHolder();
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holder.setAvailableProcessors(1);
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try {
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holder.setAvailableProcessors(2);
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fail();
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} catch (final IllegalStateException e) {
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assertThat(e, hasToString(containsString("availableProcessors is already set to [1], rejecting [2]")));
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}
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}
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@Test
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public void testSetAfterGet() {
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final NettyRuntime.AvailableProcessorsHolder holder = new NettyRuntime.AvailableProcessorsHolder();
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holder.availableProcessors();
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try {
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holder.setAvailableProcessors(1);
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fail();
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} catch (final IllegalStateException e) {
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assertThat(e, hasToString(containsString("availableProcessors is already set")));
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}
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}
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@Test
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public void testRacingGetAndGet() throws InterruptedException {
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final NettyRuntime.AvailableProcessorsHolder holder = new NettyRuntime.AvailableProcessorsHolder();
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final CyclicBarrier barrier = new CyclicBarrier(3);
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final AtomicReference<IllegalStateException> firstReference = new AtomicReference<>();
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final Runnable firstTarget = getRunnable(holder, barrier, firstReference);
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final Thread firstGet = new Thread(firstTarget);
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firstGet.start();
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final AtomicReference<IllegalStateException> secondRefernce = new AtomicReference<>();
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final Runnable secondTarget = getRunnable(holder, barrier, secondRefernce);
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final Thread secondGet = new Thread(secondTarget);
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secondGet.start();
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// release the hounds
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await(barrier);
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// wait for the hounds
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await(barrier);
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firstGet.join();
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secondGet.join();
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assertNull(firstReference.get());
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assertNull(secondRefernce.get());
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}
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private static Runnable getRunnable(
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final NettyRuntime.AvailableProcessorsHolder holder,
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final CyclicBarrier barrier,
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final AtomicReference<IllegalStateException> reference) {
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return () -> {
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await(barrier);
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try {
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holder.availableProcessors();
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} catch (final IllegalStateException e) {
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reference.set(e);
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}
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await(barrier);
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};
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}
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@Test
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public void testRacingGetAndSet() throws InterruptedException {
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final NettyRuntime.AvailableProcessorsHolder holder = new NettyRuntime.AvailableProcessorsHolder();
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final CyclicBarrier barrier = new CyclicBarrier(3);
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final Thread get = new Thread(() -> {
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await(barrier);
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holder.availableProcessors();
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await(barrier);
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});
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get.start();
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final AtomicReference<IllegalStateException> setException = new AtomicReference<>();
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final Thread set = new Thread(() -> {
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await(barrier);
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try {
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holder.setAvailableProcessors(2048);
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} catch (final IllegalStateException e) {
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setException.set(e);
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}
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await(barrier);
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});
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set.start();
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// release the hounds
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await(barrier);
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// wait for the hounds
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await(barrier);
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get.join();
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set.join();
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if (setException.get() == null) {
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assertThat(holder.availableProcessors(), equalTo(2048));
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} else {
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assertNotNull(setException.get());
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}
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}
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@Test
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public void testGetWithSystemProperty() {
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final String availableProcessorsSystemProperty = SystemPropertyUtil.get("io.netty.availableProcessors");
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try {
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System.setProperty("io.netty.availableProcessors", "2048");
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final NettyRuntime.AvailableProcessorsHolder holder = new NettyRuntime.AvailableProcessorsHolder();
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assertThat(holder.availableProcessors(), equalTo(2048));
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} finally {
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if (availableProcessorsSystemProperty != null) {
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System.setProperty("io.netty.availableProcessors", availableProcessorsSystemProperty);
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} else {
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System.clearProperty("io.netty.availableProcessors");
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}
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}
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}
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@Test
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@SuppressForbidden(reason = "testing fallback to Runtime#availableProcessors")
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public void testGet() {
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final String availableProcessorsSystemProperty = SystemPropertyUtil.get("io.netty.availableProcessors");
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try {
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System.clearProperty("io.netty.availableProcessors");
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final NettyRuntime.AvailableProcessorsHolder holder = new NettyRuntime.AvailableProcessorsHolder();
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assertThat(holder.availableProcessors(), equalTo(Runtime.getRuntime().availableProcessors()));
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} finally {
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if (availableProcessorsSystemProperty != null) {
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System.setProperty("io.netty.availableProcessors", availableProcessorsSystemProperty);
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} else {
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System.clearProperty("io.netty.availableProcessors");
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}
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}
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}
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private static void await(final CyclicBarrier barrier) {
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try {
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barrier.await();
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} catch (final InterruptedException e) {
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fail(e.toString());
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} catch (final BrokenBarrierException e) {
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fail(e.toString());
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}
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}
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}
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