The canonical definition of a DTO is the data shape of an object without any behavior. ViewModels are the model of the view. ViewModels typically are full or partial data from one or more objects (or DTOs) plus any additional members specific to the view’s behavior (methods that can be executed by the view, properties … Read more
Some projects have all data twice. Once as domain objects, and once as data transfer objects. This duplication has a huge cost, so the architecture needs to get a huge benefit from this separation to be worth it.
Why you should use DTOs in your REST API DTO stands for Data Transfer Object. This pattern was created with a very well defined purpose: transfer data to remote interfaces, just like web services. This pattern fits very well in a REST API and DTOs will give you more flexibility in the long run. The … Read more
There are some libraries around there: Commons-BeanUtils: ConvertUtils -> Utility methods for converting String scalar values to objects of the specified Class, String arrays to arrays of the specified Class. Commons-Lang: ArrayUtils -> Operations on arrays, primitive arrays (like int[]) and primitive wrapper arrays (like Integer[]). Spring framework: Spring has an excellent support for PropertyEditors, … Read more
A Data Transfer Object is an object that is used to encapsulate data, and send it from one subsystem of an application to another. DTOs are most commonly used by the Services layer in an N-Tier application to transfer data between itself and the UI layer. The main benefit here is that it reduces the … Read more
A POCO follows the rules of OOP. It should (but doesn’t have to) have state and behavior. POCO comes from POJO, coined by Martin Fowler [anecdote here]. He used the term POJO as a way to make it more sexy to reject the framework heavy EJB implementations. POCO should be used in the same context … Read more
JavaBeans A JavaBean is a class that follows the JavaBeans conventions as defined by Sun. Wikipedia has a pretty good summary of what JavaBeans are: JavaBeans are reusable software components for Java that can be manipulated visually in a builder tool. Practically, they are classes written in the Java programming language conforming to a particular … Read more