Newest Questions
64,221 questions
3
votes
1
answer
199
views
How to manage working directory in interactive development environments like Jupyter Notebook?
I'm having trouble with managing the working directory in Jupyter Notebook. For example, I have a .py script that requires me to change the working directory to its directory to run it properly. I've ...
- 47
6
votes
5
answers
488
views
Separate packages for mocks?
Say I have a package which handles sending emails over SMTP. Many of the apps I build use it.
For unit testing purposes, I create a mock of the email service from that package which logs raw mail ...
- 169
5
votes
3
answers
358
views
When is multiple validation layers of protection necessary?
I'm having a hard time of understanding at what point is multiple layers of validation protection necessary rather than a single point of failure and if the performance hit is a concern
Lets say you ...
3
votes
2
answers
145
views
How to segregate and name application services in DDD?
Below is an example scenario that can be used to illustrate your answer.
Let's say there is a CoffeeMachine aggregate with a set of methods similar to the following:
Methods used by admins.
...
- 407
3
votes
2
answers
228
views
Why do I need an authorisation server if my micro services can validate JWTs directly?
I'm working on a Spring-based micro service project and considering different approaches for handling authentication and authorisation. Instead of setting up a dedicated authorisation server, I’m ...
- 41
3
votes
1
answer
103
views
How does one concisely differentiate between a DNS-to-IP lookup and reverse ordering of TLD > domain > subdomain relationships?
Question, Rationale, and Context
Commonly, in AOSP package names, [2] and always, in Flatpak package names [4] (even some WinGet ones, too), [1] DNS is utilised as the naming scheme, yet is reversed ...
6
votes
7
answers
614
views
Why do "protected variables" tend to violate open closed principle?
According to Why is Clean Code suggesting avoiding protected variables?, I know there are tons of reasons to avoid protected variables.
However, there is a reason at the currently highest voted answer ...
- 2,993
0
votes
4
answers
160
views
Should release/deployment builds run tests again?
In many configurations of CI/CD pipelines I encounter, things run somewhat like this:
compilation and tests are run on a pull request
after merging, the build is triggered on the main branch, which ...
- 988
5
votes
3
answers
507
views
Reliability vs Fault Tolerance
I am confused with the following terms: Reliability and Fault Tolerance
According to Designing Data Intensive Applications book, the definition of Reliability is:
The system should continue to work ...
- 63
8
votes
5
answers
4k
views
Is it still a code smell if a class knows all subtypes but not using instanceof and downcasting?
According to Instanceof code smell, I know using "instanceof" is a code smell, so suppose there is a game with some Tools:
Tool.java:
public interface Tool{
public void printInfo();
}
...
- 2,993
2
votes
1
answer
77
views
how to update the state of many aggregates in event sourcing at once
I have one service that I plan to write using the concept of event sourcing and CQRS.
The bottom line is that it has an aggregate, let's say a Person.
Person{
ID
Name // name of person
Surname // ...
- 123
10
votes
7
answers
3k
views
Is it an anti-pattern to support different parameter types when using a dynamically-typed language?
In the Python code base we inherited there are several functions that check parameter types and try to "accommodate" different types. Example:
def process_data(arg):
json_ = {}
if ...
- 229
1
vote
3
answers
216
views
How does Object-Oriented Design fit into N-Layered Architecture?
Normally an N-Layered application is structured as follows.
User Interface layer
Business Logic Layer
Data Access Layer
DAL contains objects (data containers) representing business entities. The BLL ...
- 407
8
votes
11
answers
3k
views
Difficulty understanding benefit of Separation of Concerns
One of the motivations for separation of concerns is so a change in one place does not affect the other. I am going to make an argument with my limited understanding. Here is a scenario where I fail ...
- 407
3
votes
2
answers
135
views
UML class diagram for RBAC. I don't know if the permissions and roles are properly set
I am trying to create a UML class diagram using RBAC. I am new to this language and trying to make sense of it. I am attempting to showcase permissions to specific roles. I am not sure whether that is ...
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