public void ApproveExpenseWithInstanceExpenseApprover()
{
ExpenseHandler mary = new ExpenseHandler(new Employee("Mary Manager", new Decimal(1000)));
ApprovalResponse response = mary.Approve(new ExpenseReport(500));
Assert.Equal(ApprovalResponse.Approved, response);
}
public void SetUp()
{
_initialApprover = new ExpenseHandler(new Employee("Donald", decimal.Zero));
var mickey = new ExpenseHandler(new Employee("Mickey", new decimal(1000)));
var goofy = new ExpenseHandler(new Employee("Goofy", new decimal(5000)));
var daisy = new ExpenseHandler(new Employee("Daisy", new decimal(10000)));
_initialApprover.RegisterNext(mickey);
mickey.RegisterNext(goofy);
goofy.RegisterNext(daisy);
}
public void DeclineExpenseForAmountThatNoExpenseHandlerCanApprove()
{
ExpenseHandler mary = new ExpenseHandler(new Employee("Mary Manager", new Decimal(1000)));
ExpenseHandler victor = new ExpenseHandler(new Employee("Victor Vicepres", new Decimal(5000)));
mary.RegisterNext(victor);
ApprovalResponse response = mary.Approve(new ExpenseReport(15000));
Assert.Equal(ApprovalResponse.Denied, response);
}
public void ApproveExpenseWithInstanceNextExpenseHandler()
{
ExpenseHandler mary = new ExpenseHandler(new Employee("Mary Manager", new Decimal(1000)));
ExpenseHandler victor = new ExpenseHandler(new Employee("Victor Vicepres", new Decimal(5000)));
mary.RegisterNext(victor);
ApprovalResponse response = mary.Approve(new ExpenseReport(1500));
Assert.Equal(ApprovalResponse.Approved, response);
}
public IHttpActionResult GetExpensesByExpenseID(ExpenseDetailsRequest request)
{
if (!ModelState.IsValid)
{
return(BadRequest());
}
var response = ExpenseHandler.GetExpenseDetails(request);
return(Ok(response));
}
public void ApproveCorrect(int valueToApprove, ApprovalResponse expected)
{
var william = new ExpenseHandler(new Employee("William Worker", new decimal(0)));
var mary = new ExpenseHandler(new Employee("Mary Manager", new decimal(1000)));
var victor = new ExpenseHandler(new Employee("Victor Vicepres", new decimal(5000)));
var paula = new ExpenseHandler(new Employee("Paula President", new decimal(20000)));
william.RegisterNext(mary);
mary.RegisterNext(victor);
victor.RegisterNext(paula);
var expense = new ExpenseReport(valueToApprove);
var actual = william.Approve(expense);
Assert.Equal(expected, actual);
}
public void Should_Deny_An_Expense()
{
//Arrange
ExpenseHandler gwen = new ExpenseHandler(new Employee("Gwen Stacy", 45000));
ExpenseHandler harry = new ExpenseHandler(new Employee("Harry Osborn", 50000));
ExpenseHandler norman = new ExpenseHandler(new Employee("Norman Osborn", 8000000));
gwen.SetNext(harry);
harry.SetNext(norman);
var expenseAmount = 9000000;
IExpenseReport expenseReport = new ExpenseReport(expenseAmount);
//Act
var response = harry.Approve(expenseReport);
//Assert
Assert.Equal(ApprovalResponse.Denied, response);
}
public static void Execute()
{
IExpenseHandler YigitAli = new ExpenseHandler(new Employee("Yiğit Ali", 500));
IExpenseHandler Aysun = new ExpenseHandler(new Employee("Aysun", 1000));
IExpenseHandler Halit = new ExpenseHandler(new Employee("Halit", 10000));
YigitAli.RegisterNext(Aysun);
Aysun.RegisterNext(Halit);
decimal expenseReportAmount;
if (ConsoleInput.TryReadDecimal("Expense report amount: ", out expenseReportAmount))
{
string approverName;
IExpenseReport expenseReport = new ExpenseReport(expenseReportAmount);
ApprovalResponse response = YigitAli.Approve(expenseReport, out approverName);
string approvedBy = !string.IsNullOrEmpty(approverName) ? $" by {approverName}." : ".";
Console.WriteLine($"The request was {response}{approvedBy}");
}
}
public static void Run()
{
var head = new ExpenseHandler(new Employee("1st Level Manager", 1000))
.SetNext(new ExpenseHandler(new Employee("2nd Level Manager", 10000)))
.SetNext(new ExpenseHandler(new Employee("3nd Level Manager", 100000)))
.SetNext(new ExpenseHandler(new Employee("C Level Manager", 1000000)));
var smallCost = 500;
var largeCost = 95000;
var hugeCost = 950000;
var massiveCost = 1500000;
var smallExpense = new ExpenseReport(smallCost, worthIt: true);
var largeExpense = new ExpenseReport(largeCost, worthIt: false);
var hugeExpense = new ExpenseReport(hugeCost, worthIt: true);
var massiveExpense = new ExpenseReport(massiveCost, worthIt: true);
Console.WriteLine($"{smallCost:C} expense: {head.Approve(smallExpense)}");
Console.WriteLine($"{largeCost:C} expense: {head.Approve(largeExpense)}");
Console.WriteLine($"{hugeCost:C} expense: {head.Approve(hugeExpense)}");
Console.WriteLine($"{massiveCost:C} expense: {head.Approve(massiveExpense)}");
}
static void Main(string[] args)
{
ExpenseHandler william = new ExpenseHandler(new Employee("William Worker", Decimal.Zero));
ExpenseHandler mary = new ExpenseHandler(new Employee("Mary Managerr", 1000));
ExpenseHandler victor = new ExpenseHandler(new Employee("Victor VP", 5000));
ExpenseHandler paula = new ExpenseHandler(new Employee("Paula President", 20000));
william.RegisterNext(mary);
mary.RegisterNext(victor);
victor.RegisterNext(paula);
Decimal expenseAmount;
Decimal.TryParse(Console.ReadLine(), out expenseAmount);
var expense = new Expense(expenseAmount);
ApprovalResponse response = william.Approve(expense);
Console.WriteLine($"The expense was {response}");
Console.ReadKey();
}
public static void ChainOfCommand()
{
ExpenseHandler william = new ExpenseHandler(new Employee(0));
ExpenseHandler mary = new ExpenseHandler(new Employee(1000));
ExpenseHandler victor = new ExpenseHandler(new Employee(5000));
ExpenseHandler paula = new ExpenseHandler(new Employee(20000));
william.RegisterNext(mary);
mary.RegisterNext(victor);
paula.RegisterNext(paula);
Console.WriteLine("Please enter the expense amount;");
var expenseAmount = decimal.Parse(Console.ReadLine());
var response = william.Approve(new ExpenseReport()
{
Total = expenseAmount
});
Console.WriteLine(response);
Console.ReadKey();
}
private static void DemoChainOfResponsibilityPattern()
{
#region Problem of Logic to handle expenseReport is captured at wrong level.
/* Caller is responsible for iterating over the list.
* This means, business logic of how expenseReport is promoted in Management chain is captured at the wrong level.
* I should not be worried about getting approval of my expense report in Management chain. My manager should do it for me.
* With the Chain of Responsibility pattern, we'll able to achieve the abstraction required behind the scenes.
*/
//var employees = new List<Employee>
//{
// new Employee("William Worker", decimal.Zero),
// new Employee("Mary Manager", 1000),
// new Employee("Victor VicePres", 5000),
// new Employee("Paula President", 20000),
//};
//decimal expenseReportAmount;
//while(ConsoleInput.TryReadDecimal("Expense report amount:", out expenseReportAmount))
//{
// IExpenseReport expense = new ExpenseReport(expenseReportAmount);
// bool expenseProcessed = false;
// foreach (var approver in employees)
// {
// var response = approver.ApproveResponse(expense);
// if (response != ApprovalResponse.BeyondApprovalLimit)
// {
// Console.WriteLine($"The request was {response}.");
// expenseProcessed = true;
// break;
// }
// }
// if (!expenseProcessed)
// {
// Console.WriteLine("No one was able to approve your expense.");
// }
//}
#endregion
#region Solution through Chain of Responsibility pattern
ExpenseHandler william = new ExpenseHandler(new Employee("William Worker", decimal.Zero));
ExpenseHandler mary = new ExpenseHandler(new Employee("Mary Manager", 1000));
ExpenseHandler victor = new ExpenseHandler(new Employee("Victor VicePres", 5000));
ExpenseHandler paula = new ExpenseHandler(new Employee("Paula President", 20000));
william.RegisterNext(mary);
mary.RegisterNext(victor);
victor.RegisterNext(paula);
while (ConsoleInput.TryReadDecimal("Expense report amount:", out decimal expenseReportAmount))
{
IExpenseReport expense = new ExpenseReport(expenseReportAmount);
ApprovalResponse response = william.Approve(expense);
Console.WriteLine($"The request was {response}.");
}
#endregion
}
public ExpenseController(ExpenseHandler handler,
IExpenseRepository expenseRepository)
{
_handler = handler;
_expenseRepository = expenseRepository;
}
public SaveExpenseResponse EvaluateExpense(ManageExpenseRequest request)
{
return(ExpenseHandler.ManageExpenses(request));
}
public SaveExpenseResponse SaveExpense(SaveExpenseRequest request)
{
return(ExpenseHandler.SubmitExpenseToDatabase(request));
}
public ExpenseResponse GetExpensesByUserID(GetExpensesRequest request)
{
return(ExpenseHandler.GetAllExpenses(request));
}
