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/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @summary Test ServiceLoader with two iterators, interleaving their use
* to test that they don't interfere with each other
* @run testng TwoIterators
*/
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.Iterator;
import java.util.ServiceLoader;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
import static org.testng.Assert.*;
public class TwoIterators {
// service type
public static interface S { }
// service provider implementations
public static class S1 implements S { }
public static class S2 implements S { }
private ClassLoader testClassLoader;
// creates the services configuration file and sets the ClassLoader
@BeforeClass
void setup() throws Exception {
String classes = System.getProperty("test.classes");
Path dir = Paths.get(classes, "META-INF", "services");
Files.createDirectories(dir);
Path config = dir.resolve(S.class.getName());
Files.write(config, Arrays.asList(S1.class.getName(), S2.class.getName()));
this.testClassLoader = TwoIterators.class.getClassLoader();
}
@Test
public void testSequentialUse1() {
ServiceLoader<S> sl = ServiceLoader.load(S.class, testClassLoader);
Iterator<S> iterator1 = sl.iterator();
iterator1.next();
iterator1.next();
assertFalse(iterator1.hasNext());
Iterator<S> iterator2 = sl.iterator();
iterator2.next();
iterator2.next();
assertFalse(iterator2.hasNext());
}
@Test
public void testSequentialUse2() {
ServiceLoader<S> sl = ServiceLoader.load(S.class, testClassLoader);
Iterator<S> iterator1 = sl.iterator();
Iterator<S> iterator2 = sl.iterator();
iterator1.next();
iterator1.next();
assertFalse(iterator1.hasNext());
iterator2.next();
iterator2.next();
assertFalse(iterator2.hasNext());
}
@Test
public void testInterleaved1() {
ServiceLoader<S> sl = ServiceLoader.load(S.class, testClassLoader);
Iterator<S> iterator1 = sl.iterator();
Iterator<S> iterator2 = sl.iterator();
iterator1.next();
iterator2.next();
iterator1.next();
iterator2.next();
assertFalse(iterator1.hasNext());
assertFalse(iterator2.hasNext());
}
@Test
public void testInterleaved2() {
ServiceLoader<S> sl = ServiceLoader.load(S.class, testClassLoader);
Iterator<S> iterator1 = sl.iterator();
iterator1.next();
Iterator<S> iterator2 = sl.iterator();
assertTrue(iterator1.hasNext());
assertTrue(iterator2.hasNext());
iterator1.next();
iterator2.next();
iterator2.next();
assertFalse(iterator1.hasNext());
assertFalse(iterator2.hasNext());
}
@Test
public void testInterleaved3() {
ServiceLoader<S> sl = ServiceLoader.load(S.class, testClassLoader);
Iterator<S> iterator1 = sl.iterator();
iterator1.next();
Iterator<S> iterator2 = sl.iterator();
assertTrue(iterator2.hasNext());
assertTrue(iterator1.hasNext());
iterator2.next();
iterator2.next();
iterator1.next();
assertFalse(iterator1.hasNext());
assertFalse(iterator2.hasNext());
}
}
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