feat: topics, recipe messages

commons/src/main/java/commons/ws/Topics.java

@@ -0,0 +1,5 @@
+package commons.ws;
+
+public class Topics {
+    public static final String RECIPES = "/subscribe/recipe";
+}

commons/src/main/java/commons/ws/messages/CreateRecipeMessage.java

@@ -0,0 +1,30 @@
+package commons.ws.messages;
+
+import commons.Recipe;
+
+/**
+ * Message sent when a new recipe is created.
+ *
+ * @see commons.ws.messages.Message.Type#RECIPE_CREATE
+ */
+public class CreateRecipeMessage implements Message {
+    private Recipe recipe;
+
+    public CreateRecipeMessage(Recipe recipe) {
+        this.recipe = recipe;
+    }
+
+    @Override
+    public Type getType() {
+        return Type.RECIPE_CREATE;
+    }
+
+    /**
+     * Get the created recipe.
+     *
+     * @return The created recipe.
+     */
+    public Recipe getRecipe() {
+        return recipe;
+    }
+}

commons/src/main/java/commons/ws/messages/DeleteRecipeMessage.java

@@ -0,0 +1,28 @@
+package commons.ws.messages;
+
+/**
+ * Message sent when a recipe is deleted.
+ *
+ * @see commons.ws.messages.Message.Type#RECIPE_DELETE
+ */
+public class DeleteRecipeMessage implements Message {
+    private Long recipeId;
+
+    public DeleteRecipeMessage(Long recipeId) {
+        this.recipeId = recipeId;
+    }
+
+    @Override
+    public Type getType() {
+        return Type.RECIPE_DELETE;
+    }
+
+    /**
+     * Get the ID of the deleted recipe.
+     *
+     * @return The ID of the deleted recipe.
+     */
+    public Long getRecipeId() {
+        return recipeId;
+    }
+}

commons/src/main/java/commons/ws/messages/Message.java

@@ -0,0 +1,44 @@
+package commons.ws.messages;
+
+public interface Message {
+    public enum Type {
+        /**
+         * Message sent when a new recipe is created.
+         *
+         * @see commons.ws.messages.CreateRecipeMessage
+         */
+        RECIPE_CREATE,
+
+        /**
+         * Message sent when an existing recipe is updated.
+         *
+         * @see commons.ws.messages.UpdateRecipeMessage
+         */
+        RECIPE_UPDATE,
+
+        /**
+         * Message sent when a recipe is deleted.
+         *
+         * @see commons.ws.messages.DeleteRecipeMessage
+         */
+        RECIPE_DELETE
+    }
+
+    /**
+     * Get the type of the message.
+     * This can be used to match the message to the appropriate handler.
+     *
+     * <h3>Example</h3>
+     * <pre>
+     * Message msg = ...;
+     * switch (msg.getType()) {
+     *     case RECIPE_CREATE -> handleCreate((CreateRecipeMessage) msg);
+     *     case RECIPE_UPDATE -> handleUpdate((UpdateRecipeMessage) msg);
+     *     default -> { /* handle other cases *\/ }
+     * }
+     * </pre>
+     *
+     * @return The type of the message.
+     */
+    public Type getType();
+}

commons/src/main/java/commons/ws/messages/UpdateRecipeMessage.java

@@ -0,0 +1,30 @@
+package commons.ws.messages;
+
+import commons.Recipe;
+
+/**
+ * Message sent when an existing recipe is updated.
+ *
+ * @see commons.ws.messages.Message.Type#RECIPE_UPDATE
+ */
+public class UpdateRecipeMessage implements Message {
+    private Recipe recipe;
+
+    public UpdateRecipeMessage(Recipe recipe) {
+        this.recipe = recipe;
+    }
+
+    @Override
+    public Type getType() {
+        return Type.RECIPE_UPDATE;
+    }
+
+    /**
+     * Get the updated recipe.
+     *
+     * @return The updated recipe.
+     */
+    public Recipe getRecipe() {
+        return recipe;
+    }
+}

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/test/java/server/api/RecipeControllerTest.java

@@ -9,6 +9,7 @@ import org.junit.jupiter.api.TestInfo;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
 import org.springframework.http.HttpStatus;
+import org.springframework.messaging.simp.SimpMessagingTemplate;
 import org.springframework.test.context.ActiveProfiles;
 import server.database.RecipeRepository;
 
@@ -30,6 +31,10 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
 // This config uses an in-memory database
 @ActiveProfiles("mock-data-test")
 public class RecipeControllerTest {
+
+    @Autowired
+    private SimpMessagingTemplate template;
+
     private RecipeController controller;
     private List<Recipe> recipes;
     private final RecipeRepository recipeRepository;
@@ -48,7 +53,7 @@ public class RecipeControllerTest {
                 .range(0, NUM_RECIPES)
                 .mapToObj(x -> new Recipe(null, "Recipe " + x, List.of(), List.of()))
                 .toList();
-        controller = new RecipeController(recipeRepository);
+        controller = new RecipeController(recipeRepository, template);
         Set<String> tags = info.getTags();
         List<Long> ids = new ArrayList<>();