public static void MisTakenImmutability()
{
MyImmutableType immutable = new MyImmutableType();
CancellationTokenSource tokenSource = new CancellationTokenSource();
Task task1 = new Task(() =>
{
while (true)
{
double circ = 2 * immutable.refData.PI * immutable.circleSize;
Console.WriteLine("Circumference: {0}", circ);
if (circ == 4)
{
Console.WriteLine("mutation detected");
break;
}
tokenSource.Token.WaitHandle.WaitOne(250);
}
}, tokenSource.Token);
task1.Start();
Task.Delay(1000);
immutable.refData.PI = 2;
task1.Wait();
EndofProgram();
}
public void TestReadOnlyAutoProp()
{
MyImmutableType myImmutableType = new MyImmutableType(88m, DateTime.UtcNow);
string display = myImmutableType.ToString();
System.Diagnostics.Debug.WriteLine(display);
// myImmutableType.AmountDeposit = 80000m; // Get this error: Property or indexer 'property' cannot be assigned to — it is read only
}
public void CanDumpImmutableObject()
{
// Arrange
var input = new MyImmutableType("John Doe", 20);
// Act
var actual = input.Dump();
// Assert
actual.Should().Be(
@"{
""Name"": ""John Doe"" [System.String],
""Age"": 20 [System.Int32]
} [CrossCutting.Utilities.ObjectDumper.Tests.Helpers.MyImmutableType]");
}
static void Main47(string[] args)
{
// create a new instance of the immutable type
MyImmutableType immutable = new MyImmutableType();
// create a cancellation token source
CancellationTokenSource tokenSource = new CancellationTokenSource();
// create a task that will calculate the circumference
// of a 1 unit circle and check the result
Task task1 = new Task(() =>
{
while (true)
{
// perform the calculation
double circ = 2 * immutable.refData.PI * immutable.circleSize;
Console.WriteLine("Circumference: {0}", circ);
// check for the mutation
if (circ == 4)
{
// the mutation has occurred - break
// out of the loop
Console.WriteLine("Mutation detected");
break;
}
// sleep for a moment
tokenSource.Token.WaitHandle.WaitOne(250);
}
}, tokenSource.Token);
// start the task
task1.Start();
// wait to let the task start work
Thread.Sleep(1000);
// perform the mutation
immutable.refData.PI = 2;
// join the task
task1.Wait();
// wait for input before exiting
Console.WriteLine("Press enter to finish");
Console.ReadLine();
}
public static void Main(){
MyImmutableType mit = new MyImmutableType("An immutable type's state cannot be changed.", 49);
Console.WriteLine(mit);
}
