Update the service locator example

Author: nemanjarogic

src/AdditionalPatterns/ServiceLocator/OrderProcessing/Executor.cs

@@ -21,4 +21,4 @@ public override void Execute()
         var orderManager = new OrderManager(serviceLocator);
         orderManager.ProcessOrder(order);
     }
-}
+}

src/AdditionalPatterns/ServiceLocator/OrderProcessing/IServiceLocator.cs

@@ -3,10 +3,7 @@
 public interface IServiceLocator
 {
     void AddService<T>(T service);
-
     void AddService<T>(string serviceName, T service);
-
     T GetService<T>();
-
     object GetService<T>(string serviceName);
-}
+}

src/AdditionalPatterns/ServiceLocator/OrderProcessing/Order.cs

@@ -2,9 +2,7 @@
 
 public class Order
 {
-    public Guid ProductId { get; set; }
-
-    public decimal UnitPrice { get; set; }
-
-    public int Quantity { get; set; }
-}
+    public Guid ProductId { get; init; }
+    public decimal UnitPrice { get; init; }
+    public int Quantity { get; init; }
+}

src/AdditionalPatterns/ServiceLocator/OrderProcessing/OrderManager.cs

@@ -15,10 +15,10 @@ public void ProcessOrder(Order order)
     {
         _logger.Log("Processing new order...");
 
-        decimal totalPrice = order.UnitPrice * order.Quantity;
+        var totalPrice = order.UnitPrice * order.Quantity;
 
         var paymentProcessor = _serviceLocator.GetService<PaymentProcessor>();
-        bool isPaymentSuccessful = paymentProcessor.ProcessPayment(totalPrice);
+        var isPaymentSuccessful = paymentProcessor.ProcessPayment(totalPrice);
 
         NotifyCustomer(isPaymentSuccessful);
     }
@@ -35,4 +35,4 @@ private void NotifyCustomer(bool isPaymentSuccessful)
         notifier.NotifyCustomer("Payment failed");
         _logger.Log("Payment failed");
     }
-}
+}

src/AdditionalPatterns/ServiceLocator/OrderProcessing/PaymentProcessor.cs

@@ -4,7 +4,7 @@ public class PaymentProcessor
 {
     public bool ProcessPayment(decimal amount)
     {
-        Console.WriteLine($"Payment processor: Processing payment...");
+        Console.WriteLine("Payment processor: Processing payment...");
         return amount <= 100;
     }
-}
+}

src/AdditionalPatterns/ServiceLocator/OrderProcessing/ServiceLocator.cs

@@ -4,7 +4,7 @@
 /// The service locator plays the middleman and allow consumers
 /// to find and connect with various services.
 /// Possible improvements:
-/// 1) The service locator itself might be a singleton. There usually is no need to have two instances of a service locator.
+/// 1) The service locator itself might be a singleton. Usually, there is no need to have two instances of a service locator.
 /// 2) Lazy initialization of services might be considered.
 ///    In the example above, the constructor creates new instances for all possible services.
 ///    Initialization might be deferred until some client actually requests a particular service.
@@ -20,8 +20,8 @@ public ServiceLocator()
         // Services can be pre-populated, but users could add them dynamically too.
         _services = new Dictionary<string, object>()
         {
-            { typeof(PaymentProcessor).Name, new PaymentProcessor() },
-            { typeof(NotificationManager).Name, new NotificationManager() },
+            { nameof(PaymentProcessor), new PaymentProcessor() },
+            { nameof(NotificationManager), new NotificationManager() },
         };
     }