Added a new usage

Author: buraksenyurt

Lesson_09/src/logging.rs

@@ -0,0 +1,28 @@
+use crate::models::{Level, Log};
+use std::io::{Write, stdout};
+
+pub fn log() -> impl FnMut(&Log) {
+    let mut error_count = 0;
+    let mut warn_count = 0;
+    let mut info_count = 0;
+    move |l| {
+        stdout()
+            .write(format!("{}\n", l.to_string()).as_bytes())
+            .unwrap();
+        match l.level {
+            Level::Error => error_count += 1,
+            Level::Warn => warn_count += 1,
+            Level::Info => info_count += 1,
+            _ => {}
+        }
+        stdout()
+            .write(
+                format!(
+                    "Log Tracker: {} errors, {} warnings, {} infos\n",
+                    error_count, warn_count, info_count
+                )
+                .as_bytes(),
+            )
+            .unwrap();
+    }
+}

Lesson_09/src/main.rs

@@ -1,7 +1,9 @@
+mod logging;
 mod models;
 mod repository;
 mod systems;
 
+use crate::logging::log;
 use crate::models::*;
 use crate::systems::*;
 use repository::*;
@@ -71,4 +73,15 @@ fn main() {
         total_team_score += p.score;
     });
     println!("Total score after update: {}", total_team_score);
+
+    // FnMut döndüren log fonksiyonunun kullanımı
+    let mut logger = log();
+
+    logger(&Log::new(Level::Info, "Authentication Success".to_string()));
+    logger(&Log::new(Level::Error, "File Not Found".to_string()));
+    logger(&Log::new(Level::Error, "Login failed".to_string()));
+    logger(&Log::new(
+        Level::Warn,
+        "Response Time Decreasing".to_string(),
+    ));
 }

Lesson_09/src/models.rs

@@ -1,3 +1,12 @@
+use std::fmt::Display;
+
+#[derive(Debug)]
+pub struct Game {
+    pub title: String,
+    pub year: u16,
+    pub popularity: f32,
+}
+
 #[derive(Debug)]
 pub struct Player {
     pub id: u32,
@@ -10,3 +19,38 @@ pub struct Player {
 pub struct GameWorld {
     pub players: Vec<Player>,
 }
+
+#[derive(Debug)]
+pub struct Log {
+    pub level: Level,
+    pub explanation: String,
+}
+
+impl Log {
+    pub fn new(level: Level, explanation: String) -> Self {
+        Log { level, explanation }
+    }
+}
+
+impl Display for Log {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}:{}", self.level, self.explanation)
+    }
+}
+
+#[derive(Debug)]
+pub enum Level {
+    Info,
+    Warn,
+    Error,
+}
+
+impl Display for Level {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Level::Info => write!(f, "INFO"),
+            Level::Warn => write!(f, "WARN"),
+            Level::Error => write!(f, "ERROR"),
+        }
+    }
+}

Lesson_09/src/repository.rs

@@ -1,9 +1,5 @@
-#[derive(Debug)]
-pub struct Game {
-    pub title: String,
-    pub year: u16,
-    pub popularity: f32,
-}
+use crate::models::Game;
+
 pub fn print_games(games: &Vec<Game>) {
     for game in games {
         println!("{}, {}", game.year, game.title);