feat: product finder

.gitignore

@@ -10,6 +10,9 @@
 # BlueJ files
 *.ctxt
 
+# Environment Variables
+.env
+
 # Mobile Tools for Java (J2ME)
 .mtj.tmp/
 

src/main/java/dev/waltercrdz/api/ecommerce/orders/infrastructure/in/error/ErrorHandler.java

@@ -12,6 +12,7 @@
 import dev.waltercrdz.api.ecommerce.shared.domain.exception.ErrorCode;
 import dev.waltercrdz.api.ecommerce.shared.domain.exception.NotEnoughStockException;
 import dev.waltercrdz.api.ecommerce.shared.domain.exception.ProductNotFoundException;
+import dev.waltercrdz.api.ecommerce.shared.infrastructure.in.error.ApiError;
 
 @ControllerAdvice
 public class ErrorHandler {

src/main/java/dev/waltercrdz/api/ecommerce/products/application/ProductFinder.java

@@ -0,0 +1,28 @@
+package dev.waltercrdz.api.ecommerce.products.application;
+
+import java.util.List;
+import java.util.UUID;
+
+import org.springframework.stereotype.Service;
+
+import dev.waltercrdz.api.ecommerce.products.domain.model.Product;
+import dev.waltercrdz.api.ecommerce.products.domain.repository.ProductQueryRepository;
+import dev.waltercrdz.api.ecommerce.shared.domain.exception.ProductNotFoundException;
+
+@Service
+public class ProductFinder {
+
+    private final ProductQueryRepository reader;
+
+    public ProductFinder(ProductQueryRepository reader) {
+        this.reader = reader;
+    }
+
+    public Product find(UUID id) {
+        return reader.findById(id).orElseThrow(() -> new ProductNotFoundException("Product not found", id));
+    }
+
+    public List<Product> findAll() {
+        return reader.findAll();
+    }
+}

src/main/java/dev/waltercrdz/api/ecommerce/products/application/ProductStockUpdater.java

@@ -5,20 +5,20 @@
 import org.springframework.stereotype.Service;
 
 import dev.waltercrdz.api.ecommerce.products.domain.repository.ProductCommandRepository;
-import dev.waltercrdz.api.ecommerce.shared.domain.exception.ProductNotFoundException;
 
 @Service
 public class ProductStockUpdater {
 
+    private final ProductFinder finder;
     private final ProductCommandRepository writer;
 
-    public ProductStockUpdater(ProductCommandRepository writer) {
+    public ProductStockUpdater(ProductFinder finder, ProductCommandRepository writer) {
+        this.finder = finder;
         this.writer = writer;
     }
 
     public void updateStock(UUID productId, Integer quantity) {
-        final var product = this.writer.findById(productId)
-                                    .orElseThrow(() -> new ProductNotFoundException("Product not found", productId));
+        final var product = finder.find(productId);
         product.decreaseStock(quantity);
         this.writer.save(product);
     }

src/main/java/dev/waltercrdz/api/ecommerce/products/domain/repository/ProductCommandRepository.java

@@ -1,13 +1,8 @@
 package dev.waltercrdz.api.ecommerce.products.domain.repository;
 
-import java.util.Optional;
-import java.util.UUID;
-
 import dev.waltercrdz.api.ecommerce.products.domain.model.Product;
 
 public interface ProductCommandRepository {
 
     void save(Product product);
-
-    Optional<Product> findById(UUID id);
-}
+}

src/main/java/dev/waltercrdz/api/ecommerce/products/domain/repository/ProductQueryRepository.java

@@ -0,0 +1,13 @@
+package dev.waltercrdz.api.ecommerce.products.domain.repository;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+import dev.waltercrdz.api.ecommerce.products.domain.model.Product;
+
+public interface ProductQueryRepository {
+
+    Optional<Product> findById(UUID id);
+    List<Product> findAll();
+}

src/main/java/dev/waltercrdz/api/ecommerce/products/infrastructure/in/controller/ProductController.java

@@ -0,0 +1,39 @@
+package dev.waltercrdz.api.ecommerce.products.infrastructure.in.controller;
+
+import java.util.List;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import dev.waltercrdz.api.ecommerce.products.application.ProductFinder;
+import dev.waltercrdz.api.ecommerce.products.infrastructure.in.dto.ProductResponse;
+import dev.waltercrdz.api.ecommerce.products.infrastructure.in.mapper.ProductMapper;
+
+@RestController
+@RequestMapping("/products")
+public class ProductController {
+
+    private final ProductFinder finder;
+
+    public ProductController(ProductFinder finder) {
+        this.finder = finder;
+    }
+
+    @GetMapping("/{id}")
+    public ProductResponse getProduct(UUID id) {
+        final var product = this.finder.find(id);
+        return ProductMapper.toResponse(product);
+    }
+
+    @GetMapping
+    public List<ProductResponse> getProducts() {
+        final var products = this.finder.findAll();
+        return products.stream()
+                       .map(ProductMapper::toResponse)
+                       .collect(Collectors.toList());
+    }
+
+}

src/main/java/dev/waltercrdz/api/ecommerce/products/infrastructure/in/dto/ProductResponse.java

@@ -0,0 +1,12 @@
+package dev.waltercrdz.api.ecommerce.products.infrastructure.in.dto;
+
+import java.math.BigDecimal;
+import java.util.UUID;
+
+public record ProductResponse(
+    UUID id,
+    String name,
+    String description,
+    BigDecimal price,
+    Integer stock) {
+}

src/main/java/dev/waltercrdz/api/ecommerce/products/infrastructure/in/mapper/ProductMapper.java

@@ -0,0 +1,16 @@
+package dev.waltercrdz.api.ecommerce.products.infrastructure.in.mapper;
+
+import dev.waltercrdz.api.ecommerce.products.domain.model.Product;
+import dev.waltercrdz.api.ecommerce.products.infrastructure.in.dto.ProductResponse;
+
+public class ProductMapper {
+
+    public static ProductResponse toResponse(Product product) {
+        return new ProductResponse(
+            product.getId(),
+            product.getName(),
+            product.getDescription(),
+            product.getPrice(),
+            product.getStock());
+    }
+}

src/main/java/dev/waltercrdz/api/ecommerce/products/infrastructure/out/persistence/repository/ProductRepositoryDefault.java

@@ -1,16 +1,19 @@
 package dev.waltercrdz.api.ecommerce.products.infrastructure.out.persistence.repository;
 
+import java.util.List;
 import java.util.Optional;
 import java.util.UUID;
+import java.util.stream.Collectors;
 
 import org.springframework.stereotype.Repository;
 
 import dev.waltercrdz.api.ecommerce.products.domain.model.Product;
 import dev.waltercrdz.api.ecommerce.products.domain.repository.ProductCommandRepository;
+import dev.waltercrdz.api.ecommerce.products.domain.repository.ProductQueryRepository;
 import dev.waltercrdz.api.ecommerce.products.infrastructure.out.persistence.mapper.ProductMapper;
 
 @Repository
-public class ProductRepositoryDefault implements ProductCommandRepository {
+public class ProductRepositoryDefault implements ProductCommandRepository, ProductQueryRepository {
 
     private final ProductPostgresRepository productPostgresRepository;
 
@@ -24,6 +27,13 @@ public Optional<Product> findById(UUID product_id) {
             .map(ProductMapper::toDomain);
     }
 
+    public List<Product> findAll() {
+        return this.productPostgresRepository.findAll()
+            .stream()
+            .map(ProductMapper::toDomain)
+            .collect(Collectors.toList());
+    }
+
     @Override
     public void save(Product product) {
         this.productPostgresRepository.save(ProductMapper.toEntity(product));

src/main/java/dev/waltercrdz/api/ecommerce/orders/infrastructure/in/error/ApiError.java → src/main/java/dev/waltercrdz/api/ecommerce/shared/infrastructure/in/error/ApiError.java

@@ -1,4 +1,4 @@
-package dev.waltercrdz.api.ecommerce.orders.infrastructure.in.error;
+package dev.waltercrdz.api.ecommerce.shared.infrastructure.in.error;
 
 import dev.waltercrdz.api.ecommerce.shared.domain.exception.DomainException;
 import dev.waltercrdz.api.ecommerce.shared.domain.exception.ErrorCode;