From 8cd949d79e17635d03c8619c846b18efc56a5110 Mon Sep 17 00:00:00 2001
From: Alexander Baranov <baranovas@vtb.ru>
Date: Sat, 7 Mar 2026 16:37:13 +0300
Subject: [PATCH] subscribers - done

---
 smart-house/README.md                         | 10 ++++--
 .../bin/{room_builder.rs => house_builder.rs} |  0
 smart-house/src/bin/subscribers.rs            | 22 +++++++++++++
 smart-house/src/lib.rs                        |  2 ++
 smart-house/src/room.rs                       | 32 +++++++++++++++++--
 smart-house/src/subscriber.rs                 | 14 ++++++++
 6 files changed, 75 insertions(+), 5 deletions(-)
 rename smart-house/src/bin/{room_builder.rs => house_builder.rs} (100%)
 create mode 100644 smart-house/src/bin/subscribers.rs
 create mode 100644 smart-house/src/subscriber.rs

diff --git a/smart-house/README.md b/smart-house/README.md
index ccc3d67..e88640d 100644
--- a/smart-house/README.md
+++ b/smart-house/README.md
@@ -194,8 +194,8 @@
 
 Добавить возможность добавления callback-ов в объект комнаты, которые срабатывают при добавлении новых устройств в комнату (паттерн Observer).
 
-- [ ] Использовать динамический полиморфизм (трейт-объекты).
-- [ ] Можно передавать как объект-subscriber, так и [замыкание](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=06e9dc9bcce297d1e80a22d7e9338ee8).
+- [x] Использовать динамический полиморфизм (трейт-объекты).
+- [x] Можно передавать как объект-subscriber, так и [замыкание](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=06e9dc9bcce297d1e80a22d7e9338ee8).
 
 Добавить example-ы, демонстрирующие новый функционал.
 
@@ -205,3 +205,9 @@
 - Приложение-пример успешно выполняется.
 - Команды cargo clippy и cargo fmt --check не выводят ошибок и предупреждений.
 - Присутствуют и успешно выполняются модульные тесты.
+
+### Демонстационные примеры
+
+- `src/bin/house_builder.rs` - билдер для умного дома
+- `src/bin/reporter.rs` - компоновщик для построения отчета
+- `src/bin/subscribers.rs` - добавление коллбеков в объект комнаты
diff --git a/smart-house/src/bin/room_builder.rs b/smart-house/src/bin/house_builder.rs
similarity index 100%
rename from smart-house/src/bin/room_builder.rs
rename to smart-house/src/bin/house_builder.rs
diff --git a/smart-house/src/bin/subscribers.rs b/smart-house/src/bin/subscribers.rs
new file mode 100644
index 0000000..680177c
--- /dev/null
+++ b/smart-house/src/bin/subscribers.rs
@@ -0,0 +1,22 @@
+use smart_house::{Device, PowerSocket, Room, Subscriber};
+
+fn main() {
+    let mut room = Room::default();
+
+    room.subscribe(MySubscriber::default());
+
+    room.subscribe(|dev: &Device| {
+        println!("device added: {}", dev.display());
+    });
+
+    room.insert_device("", PowerSocket::stub(12.0, false).into());
+}
+
+#[derive(Default)]
+struct MySubscriber {}
+
+impl Subscriber for MySubscriber {
+    fn on_event(&mut self, dev: &Device) {
+        println!("DEVICE ADDED: {}", dev.display());
+    }
+}
diff --git a/smart-house/src/lib.rs b/smart-house/src/lib.rs
index 162173b..e54f81b 100644
--- a/smart-house/src/lib.rs
+++ b/smart-house/src/lib.rs
@@ -7,6 +7,7 @@ mod room;
 mod builders;
 mod print_status;
 mod reporter;
+mod subscriber;
 mod thermometer;
 
 pub use builders::{HouseBuilder, RoomBuilder};
@@ -17,4 +18,5 @@ pub use power_socket::PowerSocket;
 pub use print_status::PrintStatus;
 pub use reporter::Reporter;
 pub use room::Room;
+pub use subscriber::Subscriber;
 pub use thermometer::Thermometer;
diff --git a/smart-house/src/room.rs b/smart-house/src/room.rs
index 5078307..0437521 100644
--- a/smart-house/src/room.rs
+++ b/smart-house/src/room.rs
@@ -1,15 +1,19 @@
-use crate::{Device, PrintStatus};
+use crate::{Device, PrintStatus, Subscriber};
 use std::collections::HashMap;
+use std::fmt::{Debug, Formatter};
 use std::io::Write;
 
-#[derive(Debug)]
 pub struct Room {
     devices: HashMap<String, Device>,
+    subscribers: Vec<Box<dyn Subscriber>>,
 }
 
 impl Room {
     pub fn new(devices: HashMap<String, Device>) -> Self {
-        Self { devices }
+        Self {
+            devices,
+            subscribers: Vec::new(),
+        }
     }
 
     pub fn get_device(&self, name: &str) -> Option<&Device> {
@@ -21,12 +25,19 @@ impl Room {
     }
 
     pub fn insert_device(&mut self, name: &str, device: Device) -> Option<Device> {
+        for subscriber in &mut self.subscribers {
+            subscriber.on_event(&device);
+        }
         self.devices.insert(name.to_string(), device)
     }
 
     pub fn remove_device(&mut self, name: &str) -> Option<Device> {
         self.devices.remove(name)
     }
+
+    pub fn subscribe(&mut self, subscriber: impl Subscriber + 'static) {
+        self.subscribers.push(Box::new(subscriber));
+    }
 }
 
 impl PrintStatus for Room {
@@ -39,6 +50,21 @@ impl PrintStatus for Room {
     }
 }
 
+impl Debug for Room {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Room")
+            .field("devices", &self.devices)
+            .field("subscribers.len()", &self.subscribers.len())
+            .finish()
+    }
+}
+
+impl Default for Room {
+    fn default() -> Self {
+        Room::new(HashMap::new())
+    }
+}
+
 #[macro_export]
 macro_rules! room {
     ($($key:expr => $dev:expr),* $(,)?) => {
diff --git a/smart-house/src/subscriber.rs b/smart-house/src/subscriber.rs
new file mode 100644
index 0000000..42194ed
--- /dev/null
+++ b/smart-house/src/subscriber.rs
@@ -0,0 +1,14 @@
+use crate::Device;
+
+pub trait Subscriber {
+    fn on_event(&mut self, device: &Device);
+}
+
+impl<F> Subscriber for F
+where
+    F: Fn(&Device),
+{
+    fn on_event(&mut self, value: &Device) {
+        self(value)
+    }
+}