mcs/class/corlib/Test/System/LazyTest.cs

   1 //
   2 // LazyTest.cs - NUnit Test Cases for Lazy
   3 //
   4 // Author:
   5 //      Zoltan Varga (vargaz@gmail.com)
   6 //
   7 // Copyright (C) 2009 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 #if NET_4_0
  30
  31 using System;
  32 using System.Reflection;
  33 using System.Threading;
  34 using NUnit.Framework;
  35
  36 #pragma warning disable 219
  37 #pragma warning disable 168
  38
  39 namespace MonoTests.System
  40 {
  41         [TestFixture]
  42         public class LazyTest
  43         {
  44                 [Test]
  45                 [ExpectedException (typeof (ArgumentNullException))]
  46                 public void Ctor_Null_1 () {
  47                         new Lazy<int> (null);
  48                 }
  49
  50
  51                 [Test]
  52                 [ExpectedException (typeof (ArgumentNullException))]
  53                 public void Ctor_Null_2 () {
  54                         new Lazy<int> (null, false);
  55                 }
  56
  57                 [Test]
  58                 public void IsValueCreated () {
  59                         var l1 = new Lazy<int> ();
  60
  61                         Assert.IsFalse (l1.IsValueCreated);
  62
  63                         int i = l1.Value;
  64
  65                         Assert.IsTrue (l1.IsValueCreated);
  66                 }
  67
  68                 [Test]
  69                 public void DefaultCtor () {
  70                         var l1 = new Lazy<DefaultCtorClass> ();
  71
  72                         var o = l1.Value;
  73                         Assert.AreEqual (5, o.Prop);
  74                 }
  75
  76                 class DefaultCtorClass {
  77                         public DefaultCtorClass () {
  78                                 Prop = 5;
  79                         }
  80
  81                         public int Prop {
  82                                 get; set;
  83                         }
  84                 }
  85
  86                 [Test]
  87                 public void NoDefaultCtor () {
  88                         var l1 = new Lazy<NoDefaultCtorClass> ();
  89
  90                         try {
  91                                 var o = l1.Value;
  92                                 Assert.Fail ();
  93                         } catch (MissingMemberException) {
  94                         }
  95                 }
  96
  97                 class NoDefaultCtorClass {
  98                         public NoDefaultCtorClass (int i) {
  99                         }
 100                 }
 101
 102                 [Test]
 103                 public void NotThreadSafe () {
 104                         var l1 = new Lazy<int> ();
 105
 106                         Assert.AreEqual (0, l1.Value);
 107
 108                         var l2 = new Lazy<int> (delegate () { return 42; });
 109
 110                         Assert.AreEqual (42, l2.Value);
 111                 }
 112
 113                 static int counter;
 114
 115                 [Test]
 116                 public void EnsureSingleThreadSafeExecution () {
 117                         counter = 42;
 118
 119                         var l = new Lazy<int> (delegate () { return counter ++; }, true);
 120
 121                         object monitor = new object ();
 122                         var threads = new Thread [10];
 123                         for (int i = 0; i < 10; ++i) {
 124                                 threads [i] = new Thread (delegate () {
 125                                                 lock (monitor) {
 126                                                         Monitor.Wait (monitor);
 127                                                 }
 128                                                 int val = l.Value;
 129                                         });
 130                         }
 131                         for (int i = 0; i < 10; ++i)
 132                                 threads [i].Start ();
 133                         lock (monitor)
 134                                 Monitor.PulseAll (monitor);
 135
 136                         Assert.AreEqual (42, l.Value);
 137                 }
 138
 139                 [Test]
 140                 public void InitRecursion ()
 141                 {
 142                         Lazy<DefaultCtorClass> c = null;
 143                         c = new Lazy<DefaultCtorClass> (() => { Console.WriteLine (c.Value); return null; });
 144
 145                         try {
 146                                 var r = c.Value;
 147                                 Assert.Fail ();
 148                         } catch (InvalidOperationException) {
 149                         }
 150                 }
 151
 152                 [Test]
 153                 public void ModeNone ()
 154                 {
 155                         int x;
 156                         bool fail = true;
 157                         Lazy<int> lz = new Lazy<int> (() => { if (fail) throw new Exception (); else return 99; }, LazyThreadSafetyMode.None);
 158                         try {
 159                                 x = lz.Value;
 160                                 Assert.Fail ("#1");
 161                                 Console.WriteLine (x);
 162                         } catch (Exception ex) { }
 163
 164                         try {
 165                                 x = lz.Value;
 166                                 Assert.Fail ("#2");
 167                         } catch (Exception ex) { }
 168
 169                         fail = false;
 170                         try {
 171                                 x = lz.Value;
 172                                 Assert.Fail ("#3");
 173                         } catch (Exception ex) { }
 174
 175                         bool rec = true;
 176                         lz = new Lazy<int> (() => rec ? lz.Value : 99, LazyThreadSafetyMode.None);
 177
 178                         try {
 179                                 x = lz.Value;
 180                                 Assert.Fail ("#4");
 181                         } catch (InvalidOperationException ex) { }
 182
 183                         rec = false;
 184                         try {
 185                                 x = lz.Value;
 186                                 Assert.Fail ("#5");
 187                         } catch (InvalidOperationException ex) { }
 188                 }
 189
 190                 [Test]
 191                 public void ModePublicationOnly () {
 192                         bool fail = true;
 193                         int invoke = 0;
 194                         Lazy<int> lz = new Lazy<int> (() => { ++invoke; if (fail) throw new Exception (); else return 99; }, LazyThreadSafetyMode.PublicationOnly);
 195
 196                         try {
 197                                 int x = lz.Value;
 198                                 Assert.Fail ("#1");
 199                                 Console.WriteLine (x);
 200                         } catch (Exception ex) { }
 201
 202                         try {
 203                                 int x = lz.Value;
 204                                 Assert.Fail ("#2");
 205                         } catch (Exception ex) { }
 206
 207
 208                         Assert.AreEqual (2, invoke, "#3");
 209                         fail = false;
 210                         Assert.AreEqual (99,  lz.Value, "#4");
 211                         Assert.AreEqual (3, invoke, "#5");
 212
 213                         invoke = 0;
 214                         bool rec = true;
 215                         lz = new Lazy<int> (() => { ++invoke; bool r = rec; rec = false; return r ? lz.Value : 88; },   LazyThreadSafetyMode.PublicationOnly);
 216
 217                         Assert.AreEqual (88,  lz.Value, "#6");
 218                         Assert.AreEqual (2, invoke, "#7");
 219                 }
 220
 221                 [Test]
 222                 public void ModeExecutionAndPublication () {
 223                         int invoke = 0;
 224                         bool fail = true;
 225                         Lazy<int> lz = new Lazy<int> (() => { ++invoke; if (fail) throw new Exception (); else return 99; }, LazyThreadSafetyMode.ExecutionAndPublication);
 226
 227                         try {
 228                                 int x = lz.Value;
 229                                 Assert.Fail ("#1");
 230                                 Console.WriteLine (x);
 231                         } catch (Exception ex) { }
 232                         Assert.AreEqual (1, invoke, "#2");
 233
 234                         try {
 235                                 int x = lz.Value;
 236                                 Assert.Fail ("#3");
 237                         } catch (Exception ex) { }
 238                         Assert.AreEqual (1, invoke, "#4");
 239
 240                         fail = false;
 241                         try {
 242                                 int x = lz.Value;
 243                                 Assert.Fail ("#5");
 244                         } catch (Exception ex) { }
 245                         Assert.AreEqual (1, invoke, "#6");
 246
 247                         bool rec = true;
 248                         lz = new Lazy<int> (() => rec ? lz.Value : 99, LazyThreadSafetyMode.ExecutionAndPublication);
 249
 250                         try {
 251                                 int x = lz.Value;
 252                                 Assert.Fail ("#7");
 253                         } catch (InvalidOperationException ex) { }
 254
 255                         rec = false;
 256                         try {
 257                                 int x = lz.Value;
 258                                 Assert.Fail ("#8");
 259                         } catch (InvalidOperationException ex) { }
 260                 }
 261
 262                 static int Return22 () {
 263                         return 22;
 264                 }
 265
 266                 [Test]
 267                 public void Trivial_Lazy () {
 268                         var x = new Lazy<int> (Return22, false);
 269                         Assert.AreEqual (22, x.Value, "#1");
 270                 }
 271
 272                 [Test]
 273                 public void ConcurrentInitialization ()
 274                 {
 275                         var init = new AutoResetEvent (false);
 276                         var e1_set = new AutoResetEvent (false);
 277
 278                         var lazy = new Lazy<string> (() => {
 279                                 init.Set ();
 280                                 Thread.Sleep (10);
 281                                 throw new ApplicationException ();
 282                         });
 283
 284                         Exception e1 = null;
 285                         var thread = new Thread (() => {
 286                                 try {
 287                                         string value = lazy.Value;
 288                                 } catch (Exception ex) {
 289                                         e1 = ex;
 290                                         e1_set.Set ();
 291                                 }
 292                         });
 293                         thread.Start ();
 294
 295                         Assert.IsTrue (init.WaitOne (3000), "#1");
 296
 297                         Exception e2 = null;
 298                         try {
 299                                 string value = lazy.Value;
 300                         } catch (Exception ex) {
 301                                 e2 = ex;
 302                         }
 303
 304                         Exception e3 = null;
 305                         try {
 306                                 string value = lazy.Value;
 307                         } catch (Exception ex) {
 308                                 e3 = ex;
 309                         }
 310
 311                         Assert.IsTrue (e1_set.WaitOne (3000), "#2");
 312                         Assert.AreSame (e1, e2, "#3");
 313                         Assert.AreSame (e1, e3, "#4");
 314                 }
 315
 316         }
 317 }
 318
 319 #endif