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WebClient9Test.java
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/*
* Copyright (c) 2002-2026 Gargoyle Software Inc.
*
* 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
* https://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.htmlunit;
import java.io.StringReader;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicInteger;
import org.htmlunit.WebClient.PooledCSS3Parser;
import org.htmlunit.cssparser.parser.CSSOMParser;
import org.htmlunit.cssparser.parser.InputSource;
import org.htmlunit.cssparser.parser.javacc.CSS3Parser;
import org.junit.jupiter.api.Test;
/**
* Tests for {@link WebClient} and its CSS3Parser pool.
*
* @author René Schwietzke
* @author Ronald Brill
*/
public class WebClient9Test extends SimpleWebTestCase {
/**
* Ensure that we always get fresh parser when there
* is none and we already fetched one.
*/
@Test
public void newParsersWhenNotReturning() {
try (WebClient webClient = new WebClient()) {
// ask for a parser
final CSS3Parser p1 = webClient.getCSS3Parser();
// if we ask again, it is not the same
final CSS3Parser p2 = webClient.getCSS3Parser();
assertFalse(p1 == p2);
}
}
/**
* When we close a parser, we get it again when
* asking the next time.
*/
@SuppressWarnings("resource")
@Test
public void closedParserIsPooled() {
try (WebClient webClient = new WebClient()) {
// ask for a parser
final PooledCSS3Parser p1;
final PooledCSS3Parser p2;
try (PooledCSS3Parser p = webClient.getCSS3Parser()) {
assertNotNull(p);
p1 = p;
}
try (PooledCSS3Parser p = webClient.getCSS3Parser()) {
assertNotNull(p);
p2 = p;
assertTrue(p == p1);
}
try (PooledCSS3Parser p = webClient.getCSS3Parser()) {
assertNotNull(p);
assertTrue(p == p2);
assertTrue(p1 == p2);
}
}
}
/**
* We can nest and get properly different parsers.
*/
@SuppressWarnings("resource")
@Test
public void nestingWorks() {
try (WebClient webClient = new WebClient()) {
final PooledCSS3Parser p1;
final PooledCSS3Parser p2;
try (PooledCSS3Parser p11 = webClient.getCSS3Parser()) {
try (PooledCSS3Parser p21 = webClient.getCSS3Parser()) {
assertNotNull(p11);
assertNotNull(p21);
assertFalse(p11 == p21);
// keep them
p1 = p11;
p2 = p21;
}
}
try (PooledCSS3Parser p11 = webClient.getCSS3Parser()) {
try (PooledCSS3Parser p21 = webClient.getCSS3Parser()) {
assertNotNull(p11);
assertNotNull(p21);
assertFalse(p11 == p21);
assertTrue(p11 == p1);
assertTrue(p21 == p2);
}
}
}
}
/**
* Take one, returned it, need two... get another new one
*/
@SuppressWarnings("resource")
@Test
public void flow1_2() {
try (WebClient webClient = new WebClient()) {
final PooledCSS3Parser p1;
try (PooledCSS3Parser p11 = webClient.getCSS3Parser()) {
p1 = p11;
}
try (PooledCSS3Parser p11 = webClient.getCSS3Parser()) {
assertNotNull(p11);
assertTrue(p11 == p1);
try (PooledCSS3Parser p21 = webClient.getCSS3Parser()) {
assertNotNull(p21);
assertFalse(p21 == p11);
}
}
}
}
/**
* @throws Exception if the test fails
*/
@Test
public void multithreading() throws InterruptedException {
final String css = "body { background-color: green; }";
final int numberOfThreads = 10;
final AtomicInteger errorCount = new AtomicInteger();
final CountDownLatch latch = new CountDownLatch(numberOfThreads);
final WebClient webClient = new WebClient();
for (int i = 0; i < numberOfThreads; i++) {
new Thread(() -> {
try {
for (int j = 0; j < 100_000; j++) {
try (PooledCSS3Parser pooledParser = webClient.getCSS3Parser()) {
assertNotNull(pooledParser);
try (InputSource source = new InputSource(new StringReader(css))) {
final CSSOMParser parser = new CSSOMParser(pooledParser);
parser.parseStyleSheet(source, null);
}
}
}
}
catch (final Exception e) {
errorCount.addAndGet(1);
}
latch.countDown();
}).start();
}
latch.await();
webClient.close();
assertEquals(0, errorCount.get());
}
}