public void ThreadSafeSingletonPatternTest()
{
//Arrange
PrinterThreadSafe firstPrinterObject = null;
PrinterThreadSafe secondPrinterObject = null;
PrinterThreadSafe thirdPrinterObject = null;
//Act
Task task1 = Task.Factory.StartNew(() => {
firstPrinterObject = InitializePrinterThreadSafeObjectAndAddDocument("First", "First-Document");
});
Task task2 = Task.Factory.StartNew(() => {
secondPrinterObject = InitializePrinterThreadSafeObjectAndAddDocument("Second", "Second-Document");
});
Task task3 = Task.Factory.StartNew(() => {
thirdPrinterObject = InitializePrinterThreadSafeObjectAndAddDocument("Third", "Third-Document");
});
Task.WaitAll(task1, task2, task3);
//Assert
Assert.IsTrue(firstPrinterObject.Equals(secondPrinterObject));
Assert.IsTrue(firstPrinterObject.Equals(thirdPrinterObject));
Assert.IsTrue(thirdPrinterObject.Equals(secondPrinterObject));
}
public PrinterThreadSafe InitializePrinterThreadSafeObjectAndAddDocument(string instanceName, string documentName)
{
var printerObject = PrinterThreadSafe.GetPrinterInstance(instanceName);
printerObject.AddDocument(documentName);
printerObject.PrintDocument();
return(printerObject);
}
