1 /*
   2  * Copyright (c) 2015, 2020, 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.  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).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 import java.util.Arrays;
  27 import java.util.ConcurrentModificationException;
  28 import java.util.HashMap;
  29 import java.util.Hashtable;
  30 import java.util.Iterator;
  31 import java.util.LinkedHashMap;
  32 import java.util.Map;
  33 import java.util.TreeMap;
  34 import java.util.function.BiFunction;
  35 
  36 import org.testng.annotations.Test;
  37 import org.testng.annotations.DataProvider;
  38 
  39 /**
  40  * @test
  41  * @bug 8071667
  42  * @summary Ensure that ConcurrentModificationExceptions are thrown as specified from Map methods that accept Functions
  43  * @author bchristi
  44  * @build Defaults
  45  * @run testng FunctionalCMEs
  46  */
  47 public class FunctionalCMEs {
  48     static final String KEY = "key";
  49 
  50     @DataProvider(name = "Maps", parallel = true)
  51     private static Iterator<Object[]> makeMaps() {
  52         return Arrays.asList(
  53                 // Test maps that CME
  54                 new Object[]{new HashMap<>(), true},
  55                 new Object[]{new Hashtable<>(), true},
  56                 new Object[]{new LinkedHashMap<>(), true},
  57                 new Object[]{new TreeMap<>(), true},
  58                 // Test default Map methods - no CME
  59                 new Object[]{new Defaults.ExtendsAbstractMap<>(), false}
  60         ).iterator();
  61     }
  62 
  63     @Test(dataProvider = "Maps")
  64     public void testComputeIfAbsent(Map<String,String> map, boolean expectCME) {
  65         checkCME(() -> {
  66             map.computeIfAbsent(KEY, k -> {
  67                 putToForceRehash(map);
  68                 return "computedValue";
  69             });
  70         }, expectCME);
  71     }
  72 
  73     @Test(dataProvider = "Maps")
  74     public void testCompute(Map<String,String> map, boolean expectCME) {
  75         checkCME(() -> {
  76             map.compute(KEY, mkBiFunc(map));
  77         }, expectCME);
  78     }
  79 
  80     @Test(dataProvider = "Maps")
  81     public void testComputeWithKeyMapped(Map<String,String> map, boolean expectCME) {
  82         map.put(KEY, "firstValue");
  83         checkCME(() -> {
  84             map.compute(KEY, mkBiFunc(map));
  85         }, expectCME);
  86     }
  87 
  88     @Test(dataProvider = "Maps")
  89     public void testComputeIfPresent(Map<String,String> map, boolean expectCME) {
  90         map.put(KEY, "firstValue");
  91         checkCME(() -> {
  92            map.computeIfPresent(KEY, mkBiFunc(map));
  93         }, expectCME);
  94     }
  95 
  96     @Test(dataProvider = "Maps")
  97     public void testMerge(Map<String,String> map, boolean expectCME) {
  98         map.put(KEY, "firstValue");
  99         checkCME(() -> {
 100             map.merge(KEY, "nextValue", mkBiFunc(map));
 101         }, expectCME);
 102     }
 103 
 104     @Test(dataProvider = "Maps")
 105     public void testForEach(Map<String,String> map, boolean ignored) {
 106         checkCME(() -> {
 107             map.put(KEY, "firstValue");
 108             putToForceRehash(map);
 109             map.forEach((k,v) -> {
 110                 map.remove(KEY);
 111             });
 112         }, true);
 113     }
 114 
 115     @Test(dataProvider = "Maps")
 116     public void testReplaceAll(Map<String,String> map, boolean ignored) {
 117         checkCME(() -> {
 118             map.put(KEY, "firstValue");
 119             putToForceRehash(map);
 120             map.replaceAll((k,v) -> {
 121                 map.remove(KEY);
 122                 return "computedValue";
 123             });
 124         },true);
 125     }
 126 
 127     private static void checkCME(Runnable code, boolean expectCME) {
 128         try {
 129             code.run();
 130         } catch (ConcurrentModificationException cme) {
 131             if (expectCME) { return; } else { throw cme; }
 132         }
 133         if (expectCME) {
 134             throw new RuntimeException("Expected CME, but wasn't thrown");
 135         }
 136     }
 137 
 138     private static BiFunction<String,String,String> mkBiFunc(Map<String,String> map) {
 139         return (k,v) -> {
 140             putToForceRehash(map);
 141             return "computedValue";
 142         };
 143     }
 144 
 145     private static void putToForceRehash(Map<String,String> map) {
 146         for (int i = 0; i < 64; ++i) {
 147             map.put(i + "", "value");
 148         }
 149     }
 150 }