FunctionalCMEs.java revision 12745:f068a4ffddd2 
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.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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25import java.util.Arrays;
26import java.util.ConcurrentModificationException;
27import java.util.HashMap;
28import java.util.Hashtable;
29import java.util.Iterator;
30import java.util.LinkedHashMap;
31import java.util.Map;
32import java.util.function.BiFunction;
33
34import org.testng.annotations.Test;
35import org.testng.annotations.DataProvider;
36
37/**
38 * @test
39 * @bug 8071667
40 * @summary Ensure that ConcurrentModificationExceptions are thrown as specified from Map methods that accept Functions
41 * @author bchristi
42 * @build Defaults
43 * @run testng FunctionalCMEs
44 */
45public class FunctionalCMEs {
46    static final String KEY = "key";
47
48    @DataProvider(name = "Maps", parallel = true)
49    private static Iterator<Object[]> makeMaps() {
50        return Arrays.asList(
51                // Test maps that CME
52                new Object[]{new HashMap<>(), true},
53                new Object[]{new Hashtable<>(), true},
54                new Object[]{new LinkedHashMap<>(), true},
55                // Test default Map methods - no CME
56                new Object[]{new Defaults.ExtendsAbstractMap<>(), false}
57        ).iterator();
58    }
59
60    @Test(dataProvider = "Maps")
61    public void testComputeIfAbsent(Map<String,String> map, boolean expectCME) {
62        checkCME(() -> {
63            map.computeIfAbsent(KEY, k -> {
64                putToForceRehash(map);
65                return "computedValue";
66            });
67        }, expectCME);
68    }
69
70    @Test(dataProvider = "Maps")
71    public void testCompute(Map<String,String> map, boolean expectCME) {
72        checkCME(() -> {
73            map.compute(KEY, mkBiFunc(map));
74        }, expectCME);
75    }
76
77    @Test(dataProvider = "Maps")
78    public void testComputeWithKeyMapped(Map<String,String> map, boolean expectCME) {
79        map.put(KEY, "firstValue");
80        checkCME(() -> {
81            map.compute(KEY, mkBiFunc(map));
82        }, expectCME);
83    }
84
85    @Test(dataProvider = "Maps")
86    public void testComputeIfPresent(Map<String,String> map, boolean expectCME) {
87        map.put(KEY, "firstValue");
88        checkCME(() -> {
89           map.computeIfPresent(KEY, mkBiFunc(map));
90        }, expectCME);
91    }
92
93    @Test(dataProvider = "Maps")
94    public void testMerge(Map<String,String> map, boolean expectCME) {
95        map.put(KEY, "firstValue");
96        checkCME(() -> {
97            map.merge(KEY, "nextValue", mkBiFunc(map));
98        }, expectCME);
99    }
100
101    @Test(dataProvider = "Maps")
102    public void testForEach(Map<String,String> map, boolean ignored) {
103        checkCME(() -> {
104            map.put(KEY, "firstValue");
105            putToForceRehash(map);
106            map.forEach((k,v) -> {
107                map.remove(KEY);
108            });
109        }, true);
110    }
111
112    @Test(dataProvider = "Maps")
113    public void testReplaceAll(Map<String,String> map, boolean ignored) {
114        checkCME(() -> {
115            map.put(KEY, "firstValue");
116            putToForceRehash(map);
117            map.replaceAll((k,v) -> {
118                map.remove(KEY);
119                return "computedValue";
120            });
121        },true);
122    }
123
124    private static void checkCME(Runnable code, boolean expectCME) {
125        try {
126            code.run();
127        } catch (ConcurrentModificationException cme) {
128            if (expectCME) { return; } else { throw cme; }
129        }
130        if (expectCME) {
131            throw new RuntimeException("Expected CME, but wasn't thrown");
132        }
133    }
134
135    private static BiFunction<String,String,String> mkBiFunc(Map<String,String> map) {
136        return (k,v) -> {
137            putToForceRehash(map);
138            return "computedValue";
139        };
140    }
141
142    private static void putToForceRehash(Map<String,String> map) {
143        for (int i = 0; i < 64; ++i) {
144            map.put(i + "", "value");
145        }
146    }
147}
148