From 6244d508cd20be0e2adab05cfb684475cd5f074b Mon Sep 17 00:00:00 2001
From: Claudiu Farcas <claudiu.farcas@cgm.com>
Date: Tue, 20 Apr 2021 22:28:01 +0300
Subject: [PATCH] bridge design pattern

---
 Program.cs                        |  4 +-
 structural/bridge/BridgeSample.cs | 77 +++++++++++++++++++++++++++++++
 2 files changed, 80 insertions(+), 1 deletion(-)
 create mode 100644 structural/bridge/BridgeSample.cs

diff --git a/Program.cs b/Program.cs
index 1f4f950..16ec312 100644
--- a/Program.cs
+++ b/Program.cs
@@ -8,6 +8,7 @@ using design_patterns.creational.facadebuilder;
 using design_patterns.creational.singleton;
 using design_patterns.creational.prototype;
 using design_patterns.structural.adapter;
+using design_patterns.structural.bridge;
 
 namespace design_patterns
 {
@@ -27,7 +28,8 @@ namespace design_patterns
                 // await PrototypeSample.Run();
 
                 // structural
-                await AdapterSample.Run();
+                // await AdapterSample.Run();
+                await BridgeSample.Run();
             }
             catch (System.Exception ex)
             {
diff --git a/structural/bridge/BridgeSample.cs b/structural/bridge/BridgeSample.cs
new file mode 100644
index 0000000..a475bae
--- /dev/null
+++ b/structural/bridge/BridgeSample.cs
@@ -0,0 +1,77 @@
+using System;
+using System.Threading.Tasks;
+
+namespace design_patterns.structural.bridge
+{
+    /// <summary>
+    /// Bridge is a structural design pattern that lets you split a large class 
+    /// or a set of closely related classes into two separate 
+    /// hierarchies— abstraction and implementation — which can be 
+    /// developed independently of each other.
+    /// 
+    /// - Used when you want to divide and organize a monolithic class.
+    /// - Used when you need to extend a class in several orthogonal 
+    ///     (independent) dimensions.
+    /// - Used if you need to be able to switch implementations at runtime.
+    /// </summary>
+    public class BridgeSample
+    {
+        public static async Task Run()
+        {
+            Console.WriteLine("Structural - Bridge");
+
+            var notification = new Notification {
+                Category = "Cat1",
+                Priority = "High",
+                Message = "Something happend"
+            };
+            var notSender = new NotificationSender(new EmailSenderService());
+            notSender.SendNotification(notification);
+            notSender = new NotificationSender(new SmsSenderService());
+            notSender.SendNotification(notification);
+        }
+    }
+
+    public class Notification
+    {
+        public string Category { get; set; }
+        public string Message { get; set; }
+        public string Priority { get; set; }
+    }
+
+    // Abstraction
+    public class NotificationSender
+    {
+        private readonly ISenderService senderservice;
+        public NotificationSender(ISenderService senderservice)
+        {
+            this.senderservice = senderservice;
+        }
+
+        public void SendNotification (Notification notification) {
+            var message = $"\tCategory: {notification.Category}\n\r\tPriority: {notification.Priority}\n\r\tMessage: {notification.Message}";
+            senderservice.SendMessage(message);
+        }
+    }
+
+    // Implementation
+    public interface ISenderService {
+        void SendMessage(string message);
+    }
+
+    public class EmailSenderService : ISenderService
+    {
+        public void SendMessage(string message)
+        {
+            System.Console.WriteLine($"Emailing message:\n\r{message}");
+        }
+    }
+
+    public class SmsSenderService : ISenderService
+    {
+        public void SendMessage(string message)
+        {
+            System.Console.WriteLine($"Sms message:\r\n{message}");
+        }
+    }
+}
\ No newline at end of file