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.  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.function.BiFunction;
  34 
  35 import org.testng.annotations.Test;
  36 import org.testng.annotations.DataProvider;
  37 
  38 /**
  39  * @test
  40  * @bug 8071667
  41  * @summary Ensure that ConcurrentModificationExceptions are thrown as specified from Map methods that accept Functions
  42  * @author bchristi
  43  * @build Defaults
  44  * @run testng FunctionalCMEs
  45  */
  46 public class FunctionalCMEs {
  47     static final String KEY = "key";
  48 
  49     @DataProvider(name = "Maps", parallel = true)
  50     private static Iterator<Object[]> makeMaps() {
  51         return Arrays.asList(
  52                 // Test maps that CME
  53                 new Object[]{new HashMap<>(), true},
  54                 new Object[]{new Hashtable<>(), true},
  55                 new Object[]{new LinkedHashMap<>(), true},
  56                 // Test default Map methods - no CME
  57                 new Object[]{new Defaults.ExtendsAbstractMap<>(), false}
  58         ).iterator();
  59     }
  60 
  61     @Test(dataProvider = "Maps")
  62     public void testComputeIfAbsent(Map<String,String> map, boolean expectCME) {
  63         checkCME(() -> {
  64             map.computeIfAbsent(KEY, k -> {
  65                 putToForceRehash(map);
  66                 return "computedValue";
  67             });
  68         }, expectCME);
  69     }
  70 
  71     @Test(dataProvider = "Maps")
  72     public void testCompute(Map<String,String> map, boolean expectCME) {
  73         checkCME(() -> {
  74             map.compute(KEY, mkBiFunc(map));
  75         }, expectCME);
  76     }
  77 
  78     @Test(dataProvider = "Maps")
  79     public void testComputeWithKeyMapped(Map<String,String> map, boolean expectCME) {
  80         map.put(KEY, "firstValue");
  81         checkCME(() -> {
  82             map.compute(KEY, mkBiFunc(map));
  83         }, expectCME);
  84     }
  85 
  86     @Test(dataProvider = "Maps")
  87     public void testComputeIfPresent(Map<String,String> map, boolean expectCME) {
  88         map.put(KEY, "firstValue");
  89         checkCME(() -> {
  90            map.computeIfPresent(KEY, mkBiFunc(map));
  91         }, expectCME);
  92     }
  93 
  94     @Test(dataProvider = "Maps")
  95     public void testMerge(Map<String,String> map, boolean expectCME) {
  96         map.put(KEY, "firstValue");
  97         checkCME(() -> {
  98             map.merge(KEY, "nextValue", mkBiFunc(map));
  99         }, expectCME);
 100     }
 101 
 102     @Test(dataProvider = "Maps")
 103     public void testForEach(Map<String,String> map, boolean ignored) {
 104         checkCME(() -> {
 105             map.put(KEY, "firstValue");
 106             putToForceRehash(map);
 107             map.forEach((k,v) -> {
 108                 map.remove(KEY);
 109             });
 110         }, true);
 111     }
 112 
 113     @Test(dataProvider = "Maps")
 114     public void testReplaceAll(Map<String,String> map, boolean ignored) {
 115         checkCME(() -> {
 116             map.put(KEY, "firstValue");
 117             putToForceRehash(map);
 118             map.replaceAll((k,v) -> {
 119                 map.remove(KEY);
 120                 return "computedValue";
 121             });
 122         },true);
 123     }
 124 
 125     private static void checkCME(Runnable code, boolean expectCME) {
 126         try {
 127             code.run();
 128         } catch (ConcurrentModificationException cme) {
 129             if (expectCME) { return; } else { throw cme; }
 130         }
 131         if (expectCME) {
 132             throw new RuntimeException("Expected CME, but wasn't thrown");
 133         }
 134     }
 135 
 136     private static BiFunction<String,String,String> mkBiFunc(Map<String,String> map) {
 137         return (k,v) -> {
 138             putToForceRehash(map);
 139             return "computedValue";
 140         };
 141     }
 142 
 143     private static void putToForceRehash(Map<String,String> map) {
 144         for (int i = 0; i < 64; ++i) {
 145             map.put(i + "", "value");
 146         }
 147     }
 148 }