cleancode | clean code code kata | Architecture library

I am building a complex system, based on clean architecture (https://blog.cleancoder.com/uncle-bob/2012/08/13/the-clean-architecture.html), using many external components, for example a payment terminal. The mentioned payment terminal has a library which contains basic functions, including a place to pass a callback, so that the terminal can inform about the progress of the transaction, e.g. (insert pin or remove the payment card).

Let's consider a scenario:

1. User presses the button "Perform transaction", using some kind of adapter system notices that user wants to perform transaction.
2. System using other kind of adapter calls external API and tells it "perform transaction".
3. Now we would like to inform user about the progress... via external API callback.

in order to use a callback API, one or more of our application classes must implement the callback method(s), and must therefore conform to some abstraction defined by the API’s provider. So our classes must depend on the API. Which means that the API can’t be easily mocked or stubbed. We have to treat our callback objects as being part of the adapter for that API, and test the rest of the application by mocking or stubbing them.

On one hand, I would not want to make the architecture dependent on an external API, but creating new entities specifically to handle API events seems over-engineered to me.

My error boundary caught error with useTranslation hook from i18next. I can't get proper error text because of that error boundary. Just got text like "above error occured in ...". Can you give me any ideas why is this happening?

Problems with this line:

I have been struggeling with a "simple" task for some time now and have figured out how to solve the problem in an alternative way. But I still would like to know what I was doing wrong in my first attempt where I used reduce. My goal is to count the number of blogs for each author so that I get this result: { 'Michael Chan': 1, 'Edsger W. Dijkstra': 2, 'Robert C. Martin': 3 }

My first attempt:

My code is below:

I have an array like this:

I have a new MacBook Air with the M1-CPU. I have installed eclipse and I can code with the IDE, but I can't open a .jar-File because it is grayed out. My target is, to open the file with eclipse, so that i can edit the file.

Eclipse-specifications:

Version: 2020-12 (4.18.0) | Build id: 20201210-1552

When I would try to open the .jar file without a IDE it comes a Error with the massage:

"CleanCode.jar" cannot be opened because it comes from an unverified developer.

Then I opened it with control:

macOS cannot verify the developer of "CleanCode.jar". Do you really want to open the app?

I accepted and then comes this Error:

Failed to launch the Java app.

In the Console I run this command:

java -jar Downloads/CleanCode.jar

And the Output was this:

Error: Invalid or corrupt jarfile Downloads/CleanCode.jar

My Settings:

java --version

Output: java 16 2021-03-16

I have installed Java SE Development Kit 16 for Mac and this Java Version 8 Update 281

In a clean architecture approach to software the entities are the innermost layer and should not depend on something like an ORM.

For convenience I would like to use an ORM in my project and gorm seems to be a popular library. In the gorm docs the recommended way to use it is by having the gorm.Model struct included in the structs you want to persist in the database.

When trying to use gorm in my project and following clean architecture I thus end up with a mapping layer which maps my entities to and from a persistence model specific to gorm in order to keep the gorm dependency out of my entities. This seems to eradicate all the benefits of using an ORM and in e.g. this blog post is explicitly warned about.

It seems to me avoiding the mapping layer while following clean architecture can only be achieved by using a less invasive ORM or even just a sql extension like e.g. sqlx where I can use my entities directly?

Hi I have a Json api for blog, In which I want to test and return one blog that has the highest likes but I couldn't get that done for two days now and I really made research and I can't solve am using JEST to test. I'll appreciate your help. Here is the api.

From what I understood in Clean Architecture, the objects in the Interface Adapters layer adapts the application's core to possible different infrastructures. That way the application's core can take input from different sources, like HTTP requests and console commands.

Generally a Controller takes the input and a Presenter gives the output, since the Controller is an adapter, it may be required to transform the given input to a different format accepted by the Use Case Interactor. In this case, what happens when the Controller gets a bad input? How can it tell the client that an error happened, since the output is given by the Presenter?

EDIT: Thinking better, the Controller should not care whether the input is valid or not, It should try to always convert the input, even if it's needed to convert an invalid input to another invalid input. The UseCaseInteractor should always return a meaningful response, it should not propagate exceptions to the caller. So when the Controller gets bad input, it simply sends bad input to the called interactors, which can then properly handle bad inputs (it's application logic) and present error message through its presenters. For the Controllers input is input, its job is to adapt at best, am I right?