All Questions
Tagged with factory-pattern singleton
32 questions
1
vote
1
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156
views
Is this right for a factory method producing singletons?
I've got this bit of code for a factory method to produce singletons. I have a small MAUI app and want to have persistent global data.
public static class FactoryService
{
private static ...
- 404
0
votes
0
answers
25
views
Is this the Abstract Factory pattern or something else?
I have an abstract class that's following the singleton pattern, then I have a few concrete classes that extend it:
UML Diagram
At startup, based on the current system, I'm setting a concrete instance ...
- 11
0
votes
1
answer
1k
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what is the best way to move logic from controller to a service
my question is : How to take my business logic out of controller and transfer it to a service ???
I am currently using two separate controllers for Post model in Laravel. One for user-related logic ...
4
votes
1
answer
4k
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How to implement Singleton pattern in Dart using factory constructors?
I'm trying to implement the singleton pattern in a database helper class, but, I can't seem to understand the purpose of a factory constructor and if there's an alternative method to using it.
class ...
- 1,260
0
votes
3
answers
663
views
Changing `self` for another instance of same object?
I want to create a class, and all objects need to have a unique identifier key, and If I attempt to create a new instance of the object with a previously existent key, the instance should be the same ...
- 842
2
votes
2
answers
5k
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Combining the Factory Method and Singleton Design Patterns
I am currently implementing a game in which there are different types of maps. Being all maps, they naturally share certain attributes and methods, so an abstract class Map was created, to then be ...
- 1,463
0
votes
2
answers
702
views
What is the best way to implement Singleton pattern combined with Factory pattern in Java? Detail in description
I am learning design patterns for JAVA. I wanted to use factory pattern with singleton. Now I am not sure If I went with correct approach or not.
Let me share what I have tried first.
I have used ...
- 430
3
votes
4
answers
297
views
How do I return a limited number of cached instances in Java?
I have a "configuration" class that becomes a field of several other classes. It indicates some kind of configuration or "abilities" of those other classes to allow or disallow actions. The ...
- 2,074
0
votes
1
answer
76
views
Is this singleton design pattern bad? Is it wrong to use Singleton in this case?
The problem:
For simplicity i'll use a simple example. In a sample application, a Class-A reads some data.
Class-A then instantiates Class-B, which then instantiates Class-C. So in all there is a 3-...
- 16.6k
0
votes
1
answer
815
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Optimized way to create OracleConnection and Command objects in c#
I have the following code in DAL layer:
using(OracleConnection conn= new OracleConnection(connString))
using(OracleCommand cmd = new OracleCommand(sql.ToString(), conn))
{
conn.Open();
}
The above ...
- 688
0
votes
1
answer
108
views
C++ Factory of templated sigleton
Here a simple project in C++ with 2 design pattern: singleton and factory, sigleton is a templated class too and an interface (IHash) and a class (Hash1).
A simple factory class (HashFactory) creates ...
- 565
1
vote
1
answer
1k
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Where to initialize Factory object?
I'm used to creating Singletons to implement a globally shared state, and I'm reading about how Singletons aren't testable and that the Factory pattern should be used instead. The problem I'm having ...
- 568
2
votes
1
answer
850
views
Java Abstract Factories and Singletons [duplicate]
I would like to implement an example of abstract factory, however concrete factories must be served as singletons.
Giving the example of Mr. Banas here : http://www.newthinktank.com/2012/09/abstract-...
- 65
1
vote
1
answer
2k
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how to use singleton and/or factory patterns in business logic layer
I understand the purpose of singleton and factory patterns, however I have doubts implementing it. My problem is that whenever I need to call a method from BLL, then I have create an instance of BLL ...
- 8,271
-2
votes
2
answers
658
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Singleton pattern combined with Factory [closed]
I'm running an email marketing program that runs and schedules campaigns. So I have two types of campaigns in it:
Ad hoc
Scheduled
And since I want my program to create one campaign at a time. I ...
- 7,268