1/*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/**
25 * @test
26 * @summary Test ServiceLoader with two iterators, interleaving their use
27 *   to test that they don't interfere with each other
28 * @run testng TwoIterators
29 */
30
31import java.nio.file.Files;
32import java.nio.file.Path;
33import java.nio.file.Paths;
34import java.util.Arrays;
35import java.util.Iterator;
36import java.util.ServiceLoader;
37
38import org.testng.annotations.BeforeClass;
39import org.testng.annotations.Test;
40import static org.testng.Assert.*;
41
42public class TwoIterators {
43
44    // service type
45    public static interface S { }
46
47    // service provider implementations
48    public static class S1 implements S { }
49    public static class S2 implements S { }
50
51    private ClassLoader testClassLoader;
52
53    // creates the services configuration file and sets the ClassLoader
54    @BeforeClass
55    void setup() throws Exception {
56        String classes = System.getProperty("test.classes");
57        Path dir = Paths.get(classes, "META-INF", "services");
58        Files.createDirectories(dir);
59        Path config = dir.resolve(S.class.getName());
60        Files.write(config, Arrays.asList(S1.class.getName(), S2.class.getName()));
61
62        this.testClassLoader = TwoIterators.class.getClassLoader();
63    }
64
65    @Test
66    public void testSequentialUse1() {
67        ServiceLoader<S> sl = ServiceLoader.load(S.class, testClassLoader);
68
69        Iterator<S> iterator1 = sl.iterator();
70        iterator1.next();
71        iterator1.next();
72        assertFalse(iterator1.hasNext());
73
74        Iterator<S> iterator2 = sl.iterator();
75        iterator2.next();
76        iterator2.next();
77        assertFalse(iterator2.hasNext());
78    }
79
80    @Test
81    public void testSequentialUse2() {
82        ServiceLoader<S> sl = ServiceLoader.load(S.class, testClassLoader);
83
84        Iterator<S> iterator1 = sl.iterator();
85        Iterator<S> iterator2 = sl.iterator();
86
87        iterator1.next();
88        iterator1.next();
89        assertFalse(iterator1.hasNext());
90
91        iterator2.next();
92        iterator2.next();
93        assertFalse(iterator2.hasNext());
94    }
95
96    @Test
97    public void testInterleaved1() {
98        ServiceLoader<S> sl = ServiceLoader.load(S.class, testClassLoader);
99
100        Iterator<S> iterator1 = sl.iterator();
101        Iterator<S> iterator2 = sl.iterator();
102
103        iterator1.next();
104        iterator2.next();
105        iterator1.next();
106        iterator2.next();
107        assertFalse(iterator1.hasNext());
108        assertFalse(iterator2.hasNext());
109    }
110
111    @Test
112    public void testInterleaved2() {
113        ServiceLoader<S> sl = ServiceLoader.load(S.class, testClassLoader);
114
115        Iterator<S> iterator1 = sl.iterator();
116        iterator1.next();
117
118        Iterator<S> iterator2 = sl.iterator();
119
120        assertTrue(iterator1.hasNext());
121        assertTrue(iterator2.hasNext());
122
123        iterator1.next();
124        iterator2.next();
125        iterator2.next();
126
127        assertFalse(iterator1.hasNext());
128        assertFalse(iterator2.hasNext());
129    }
130
131    @Test
132    public void testInterleaved3() {
133        ServiceLoader<S> sl = ServiceLoader.load(S.class, testClassLoader);
134
135        Iterator<S> iterator1 = sl.iterator();
136        iterator1.next();
137
138        Iterator<S> iterator2 = sl.iterator();
139
140        assertTrue(iterator2.hasNext());
141        assertTrue(iterator1.hasNext());
142
143        iterator2.next();
144        iterator2.next();
145        iterator1.next();
146
147        assertFalse(iterator1.hasNext());
148        assertFalse(iterator2.hasNext());
149    }
150}
151
152