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I am tasked to write an assembler in C, which lends itself sufficiently well in certain design-pattern scenarios, and in a parsing phase, after tokenization, I need to “fill-in” certain information that was previously ignored by tokenization. I’ll skip details, but the way I thought to solve this is by having a sole instance ofRead more

I am working on a software assignment where the design is component based. The components have ports which provide interfaces. My professor argues that the Port class which is exposed by each component should be a Singleton, as the port must be the only way to interact with the component. As I see it, multipleRead more

I’ve created working setters/getters for a application, that will use few different classes. This classes will use one class, that will store all data. I know, when I will use standard constructor of container class, I’ll get tons on nulls, due to different instance of container class. I’ve created container class within a singleton, thatRead more

In UITableViewCell class, I have two properties. one is a UINavigationController @interface TableViewCell @property (nonatomic, strong) UINavigationController * targetNaviCtrl; @implementation TableViewCell – (UINavigationController *)targetNaviCtrl{ if(!_targetNaviCtrl){ UIResponder *target = self.nextResponder; do { target = target.nextResponder; } while (![target isKindOfClass:UINavigationController.self] && target != nil); _targetNaviCtrl = (UINavigationController *)target; } return _targetNaviCtrl; }// I use nextResponder to findRead more

Sei que o Singleton me garante uma única instância de um dado objeto. Isso eu entendi. O que me cria dúvida seria seu uso na prática assim. Vamos supor o código abaixo, usando Singleton com Generics(código tirado da internet). public sealed class Singleton<T> where T : class, new() { private static T instance; public staticRead more

I am looking to find the best implementation that would basically be a singleton strategy delegate design pattern. What would be the best/cleanest way to create singleton functionals in Java? I want to prevent unnecessary instance creation. I also want to make it so I can look up the correct function without doing a switchRead more

I want to create a media management tool, for which I try to draw an appropriate UML class diagram. The tool shall hold a collection of different media types (movies, music, etc.) which inherit from a basic medium class. Each medium has different attributes in addition (e.g. interpreter, director,…). I plan to fetch information aboutRead more

I created a singleton to have a unique instance of ExecutorService in my application. I whould like to know which is the better of the two classes below. First one : public class ExecutorServiceSingleton { private static final Logger LOG = LoggerFactory.getLogger(ExecutorServiceSingleton.class); private ScheduledExecutorService scheduledExecutorService; private static ExecutorServiceSingleton instance; private ExecutorServiceSingleton() { scheduledExecutorService = Executors.newScheduledThreadPool(1);Read more