ProviderIn: 'root'; makes Angular service singleton, and what I understood from word singleton is having one common instance for whole application. If I instantiate that service in constructor of two components(creating an object from a class) that means I am…
According to the design rules, a singleton pattern must exist in an instance. If I remove the line of code and return an object, will the function be a single pattern? const singleton = (function(){ let instance, counter = 0;…
I am using Sequelize with Node.js and TypeScript to connect to a PostgreSQL database. I want to export and import a single Sequelize instance throughout my application, so that I have a single connection to the database. I have seen…
class Logger { factory Logger(String name) => Logger._internal(name); Logger._internal(this.name); final String name; } Does this way of writing hold as a so-called singleton pattern?
Is there a way in ASP.NET to get all singletons? I want to implement a health check which would instantiate all the registered singletons and only after that return a healthy status. I am trying to get all the singletons…
How to initialize view models after a singleton in swiftUI? I have an app in swiftUI. There are two views: ClassPosts View, where users can see posts made in their class at university, and a use profile view, where users…
I have ASP.NET WebApi with one service which is added as a singleton in the following way: services.AddSingleton<IService, Service>(); As I can see constructor of this service is called not once (like we suppose to be as a singleton) but…
I'm facing an issue with resetting a singleton object in a Flutter test. I have the following limitations that need to be taken into consideration while solving the problem: 1- The _singleton variable must remain final. 2- I cannot define…
I have this code to get some data from an API: const data = async () => { const apiResponse = await dataFromAPI(); return apiResponse; } The apiResponse will always be the same for a session where this code is…
I can't figure why my widget ScrollViewStory won't update when CurrentStoryModel.instance changes. Is there a problem with the fact that CurrentStoryModel is a singleton ? Here are the widgets: class Story extends StatelessWidget { @override Widget build(BuildContext _) { return…