add ID generators

2-Application/src/main/java/category/CategoryUseCase.java

@@ -13,7 +13,6 @@ public class CategoryUseCase {
 	}
 
 	public void addCategory(CategoryName name) {
-
 		var id = this.categoryIdGenerator.generateId();
 		this.categoryRepository.add(new Category(name, id));
 	}

2-Application/src/main/java/category/RandomCategoryIdGenerator.java

@@ -0,0 +1,20 @@
+package category;
+
+public class RandomCategoryIdGenerator implements CategoryIdGenerator {
+
+	private final CategoryRepository categoryRepository;
+
+	public RandomCategoryIdGenerator(CategoryRepository categoryRepository) {
+		this.categoryRepository = categoryRepository;
+	}
+
+	@Override
+	public CategoryId generateId() {
+		var randomID = (int) (Math.random() * 10000);
+
+		if (categoryRepository.getById(new CategoryId(randomID)).isPresent()) {
+			return generateId();
+		}
+		return new CategoryId(randomID);
+	}
+}

2-Application/src/main/java/link/LinkUseCase.java

@@ -41,7 +41,6 @@ public class LinkUseCase {
 		var link = new Link(id, creator, url, categoryIds, tags);
 
 		linkRepository.add(link);
-
 	}
 
 }

2-Application/src/main/java/link/RandomLinkIdGenerator.java

@@ -0,0 +1,19 @@
+package link;
+
+public class RandomLinkIdGenerator implements LinkIdGenerator {
+	private final LinkRepository linkRepository;
+
+	public RandomLinkIdGenerator(LinkRepository linkRepository) {
+		this.linkRepository = linkRepository;
+	}
+
+	@Override
+	public LinkId generateId() {
+		var randomID = (int) (Math.random() * 10000);
+
+		if (linkRepository.getById(new LinkId(randomID)).isPresent()) {
+			return generateId();
+		}
+		return new LinkId(randomID);
+	}
+}