I'm creating rest api in spring boot and I need suggestions on whats the best approach to use builder pattern in Spring because I'm new to Spring.
Product.java (Database entity)
public class Product{
private String name;
private String sku;
//getter-setter
}
ProductBuilder.java
public interface ProductBuilder {
public ProductBuilder setBasicDetails(String name, String sku)
}
ProductBuilderImpl.java
public class ProductBuilderImpl implements ProductBuilder{
// issue is with creating new object of `Product`
@Override
public ProductBuilder setBasicDetails(String name, String sku) {
product.setName(name);
product.setSku(sku);
return this;
}
}
Suggestions for creating new object of Product for multiple HTTPRequest in following approaches.
Approach 1: @Autowired ProductBuilder.
@Service
public class xyzServiceImpl implements xyzService{
@Autowired
private ProductBuilder productBuilder;
// business logic
}
xyzServiceImpl is singleton so ProductBuilder will create only one object of Product and its shared between Thread/Request
HTTP Request 1: Product is initialized with id = null > Perform save > id = 123
HTTP Request 2: Got the object[Product.id = 123] updated in HTTP Request 1 but I want new object every time.
So I tried following solution but not working
@Configuration
public class ModelBuilderConfiguration {
@Bean
@Scope(value = "prototype")
public ProductBuilder productBuilder(){
return new ProductBuilderImpl();
}
}
and creating initMethod in ProductBuilderImpl to create new object.
@Configuration
public class ModelBuilderConfiguration {
@Bean(initMethod = "initMethod")
@Scope(value = "prototype")
public ProductBuilder productBuilder(){
return new ProductBuilderImpl();
}
}
and I used @Scope(value = "prototype", proxyMode = ScopedProxyMode.TARGET_CLASS) but this is also not working.
And using ThreadLocal works with @Autowired but is it recommended?
public class ProductBuilderImpl implements ProductBuilder{
private ThreadLocal<Product> product = new ThreadLocal<Product>(){
@Override
protected Product initialValue() {
return new Product();
}
};
@Override
public ProductBuilder setBasicDetails(String name, String sku) {
product.get().setName(name);
product.get().setSku(sku);
return this;
}
}
Approach 2: Create new object in constructor.
public class ProductBuilderImpl implements ProductBuilder{
private Product product;
public ProductBuilderImpl() {
product = new Product();
}
@Override
public ProductBuilder setBasicDetails(String name, String sku) {
product.setName(name);
product.setSku(sku);
return this;
}
}
And use it in xyzServiceImpl like ProductBuilder productBuilder = new ProductBuilderImpl(); so I'll get the new object every time.
So which is best approach considering spring? Or suggest better way for initializing Product object.
