All Questions
Tagged with javadesign-patterns
507 questions
-1votes
1answer
204views
Which pattern is suitable for this scenario?
I would like to refactor some code of a process that must perform a processing. The processing involves several steps, each of which can fail or go well. If successful, it must proceed to the next ...
3votes
1answer
153views
Deciding on granularity of SOLID's SRP
I am currently working in a project where we are utilizing kafka as a Message Queue. We have two use cases here, one is to consume the messages in parallel, no ordering of any kind required. And one ...
2votes
3answers
951views
Is breaking encapsulation a necessary compromise for serialization?
I've been considering the way to solve this problem for a while, and I'm currently stuck between two options I both feel are suboptimal. Here's an abstract example of what I'm dealing with: I have a ...
2votes
4answers
345views
Builder with non-defaultable required args
Suppose a class needs multiple properties of the same type. I don't want a big constructor where the user can mess up the order of args (remember, they are of the same type, no compile-time errors) ...
- 1,599
5votes
1answer
307views
What do you call an enum that translates its own values?
I see this pattern a lot, especially with countries, or more generally regions. An enum is defined with additional fields and with methods that translate to and from these values. Example: import ...
- 159
23votes
5answers
17kviews
Are "factory methods" anti-pattern now?
I consider Joshua Bloch's Effective Java the best book on the language that I read. However, I started to wonder about something One of the things he suggested was to prefer public static factory ...
- 347
4votes
4answers
1kviews
How to do "Separation of concerns"
I understood(edit: I assume) the importance of seperation of concerns and benifits in an application, But struggling to identify what are considered to be a concern (developer, feature, consumer or ...
1vote
2answers
127views
How do I reduce number of FieldValidator derivations?
I am trying to write RSQL Parser which checks if the RSQL is logically correct. while the RSQL Java library checks whether the RSQL expression is grammatically correct, it doesn't check if the ...
5votes
6answers
2kviews
Is it a good idea to return a Builder from a Factory?
I would want to have a builder for creating a complex object, for example Employee. I would want to be able to create my objects in two ways: Case 1. Get Employee with default values Case 2. Get ...
- 221
0votes
1answer
265views
How to correctly extend runtime exception?
We have a GraphQL server which sends data to the front end client. We have other tenants who will use our sever and host their code. I want to create a system where they all can create any custom ...
- 109
3votes
4answers
1kviews
Representing vectors as arrays of points vs. as data structures
I'm writing a program in Java where I need to represent the position, scale, and other 3-dimensional properties of objects in a world using vectors. I can use either of these two approaches: ...
- 643
1vote
5answers
933views
DTO vs POJO (Entity) on POST request
If I have for example a User POJO like the following @AllArgsConstructor public class User { @Id private final String id; private String username; private String password; private Date createdDate;...
- 119
0votes
0answers
98views
By creating an architecture, it is better to have many classes that handles different scenarios, or a single one that handles all? [duplicate]
During my limited professional experience, I have been involved in microservices projects with a common structure: The Controller takes a request and validates it using the jakarta.validation....
0votes
0answers
117views
Spring data exchange between components?
Please advise me what pattern to use in following case: I have a Java/Spring Boot application. There is a component with @KafkaListener method which receives Kafka Messages on CRUD of various subject ...
- 107
3votes
9answers
4kviews
Is it an anti-pattern to use interface for entity?
I read an article about that using an interface for an entity is an anti-pattern for these reasons: Your interface signature is identical to your class. There’s only one implementation of your ...
- 81
