Merge branch 'feature/backend-websockets' into 'main'

Backend websockets

See merge request cse1105/2025-2026/teams/csep-team-76!16

server/src/main/java/server/WebSocketConfig.java

@@ -0,0 +1,33 @@
+package server;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.messaging.simp.config.MessageBrokerRegistry;
+import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
+import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
+import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
+
+@Configuration
+@EnableWebSocketMessageBroker
+public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
+    @Override
+    public void configureMessageBroker(MessageBrokerRegistry registry) {
+
+        // SUBSCRIBE /subscribe/{mapping}, see UpdateMessagingController definition
+        // adds a broker endpoint subscribers listen to
+        registry.enableSimpleBroker("/subscribe");
+
+        // SEND /send/updates/{mapping}, see UpdateMessagingController definition
+        // the client pushes a new message to this address
+        registry.setApplicationDestinationPrefixes("/send");
+    }
+
+    @Override
+    public void registerStompEndpoints(StompEndpointRegistry registry) {
+        // a client can now push data to /send/updates/{mapping}, see UpdateMessagingController
+        // allow access from any origin: one server, many clients
+        registry.addEndpoint("/updates").setAllowedOrigins("*");
+        // optional, recommended to increase browser & networking support
+        registry.addEndpoint("/updates").setAllowedOrigins("*").withSockJS();
+
+    }
+}

server/src/main/java/server/api/RecipeController.java

@@ -2,10 +2,15 @@ package server.api;
 
 import commons.Recipe;
 
+import commons.ws.Topics;
+import commons.ws.messages.CreateRecipeMessage;
+import commons.ws.messages.DeleteRecipeMessage;
+import commons.ws.messages.UpdateRecipeMessage;
 import org.springframework.data.domain.Example;
 import org.springframework.data.domain.PageRequest;
 import org.springframework.http.ResponseEntity;
 
+import org.springframework.messaging.simp.SimpMessagingTemplate;
 import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
@@ -25,9 +30,11 @@ import java.util.Optional;
 @RequestMapping("/api")
 public class RecipeController {
     private final RecipeRepository recipeRepository; // JPA repository used in this controller
+    private final SimpMessagingTemplate messagingTemplate;
 
-    public RecipeController(RecipeRepository recipeRepository) {
+    public RecipeController(RecipeRepository recipeRepository, SimpMessagingTemplate messagingTemplate) {
         this.recipeRepository = recipeRepository;
+        this.messagingTemplate = messagingTemplate;
     }
 
     /**
@@ -61,6 +68,7 @@ public class RecipeController {
                             PageRequest.of(0, limit.get())
                     ).toList());
         }
+
         return ResponseEntity.ok(recipeRepository.findAll());
     }
 
@@ -76,9 +84,10 @@ public class RecipeController {
             return ResponseEntity.badRequest().build();
         }
 
-        // TODO: Send WS update to all subscribers with the updated recipe
+        Recipe saved = recipeRepository.save(recipe);
+        messagingTemplate.convertAndSend(Topics.RECIPES, new UpdateRecipeMessage(saved));
 
-        return ResponseEntity.ok(recipeRepository.save(recipe));
+        return ResponseEntity.ok(saved);
     }
 
     /**
@@ -104,9 +113,10 @@ public class RecipeController {
             return ResponseEntity.badRequest().build();
         }
 
-        // TODO: Send WS update to all subscribers with the new recipe
+        Recipe saved = recipeRepository.save(recipe);
+        messagingTemplate.convertAndSend(Topics.RECIPES, new CreateRecipeMessage(saved));
 
-        return ResponseEntity.ok(recipeRepository.save(recipe));
+        return ResponseEntity.ok(saved);
     }
 
     /**
@@ -124,7 +134,8 @@ public class RecipeController {
         }
         recipeRepository.deleteById(id);
 
-        // TODO: Send WS update to propagate deletion
+        messagingTemplate.convertAndSend(Topics.RECIPES, new DeleteRecipeMessage(id));
+
         return ResponseEntity.ok(true);
     }
 }

server/src/main/java/server/api/UpdateMessagingController.java

@@ -0,0 +1,29 @@
+package server.api;
+
+import commons.Recipe;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.messaging.handler.annotation.MessageMapping;
+import org.springframework.messaging.handler.annotation.SendTo;
+import org.springframework.stereotype.Controller;
+
+@Controller
+public class UpdateMessagingController {
+    private final RecipeController recipeController;
+    @Autowired
+    public UpdateMessagingController(
+            RecipeController recipeController) {
+        this.recipeController = recipeController;
+    }
+
+    /**
+     * Mapping for STOMP: <code>SEND /updates/recipe</code>
+     * @param recipe The request body as a new {@link Recipe} object to update the original into
+     * @return The updated {@link Recipe} object wrapped in a {@link org.springframework.http.ResponseEntity}.
+     */
+    @MessageMapping("/updates/recipe")
+    @SendTo("/subscribe/recipe")
+    public ResponseEntity<Recipe> broadcastRecipeUpdate(Recipe recipe) {
+        return recipeController.updateRecipe(recipe.getId(), recipe);
+    }
+}