Implement notify function in Notification service to notify each Subscriber.

src/service/notification.rs

@@ -32,5 +32,24 @@ impl NotificationService {
         }
     
         return Ok(result.unwrap());
-    }    
+    }
+
+    pub fn notify(&self, product_type: &str, status: &str, product: Product) {
+        let mut payload: Notification = Notification {
+            product_title: product.clone().title,
+            product_type: String::from(product_type),
+            product_url: product.clone().get_url(),
+            subscriber_name: String::from(""),
+            status: String::from(status),
+        };
+
+        let subscribers: Vec<Subscriber> = SubscriberRepository::list_all(product_type);
+        for subscriber in subscribers {
+            payload.subscriber_name = subscriber.clone().name;
+            let subscriber_clone = subscriber.clone();
+            let payload_clone = payload.clone();
+
+            thread::spawn(move || subscriber_clone.update(payload_clone));
+        }
+    }
 }
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