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3
votes
3answers
2k views

Is the singleton pattern prone to thread safety problems?

Is the singleton pattern prone to thread safety problems? If so, what are the best methods to work around them?
0
votes
2answers
242 views

Template rendering engine legitimate use of a singleton?

I wrote a standalone singleton class (scaffold) tonight that serves as a facade to a few other classes, including a template class and a view class. Templates and views are both named and instances ...
1
vote
5answers
503 views

Does “Property” in C# cost much?

I have a class created in some namespace, like SomeNameSpace.SubNameSpace.StaticClassName Here is a code snippet from other code file where I want to use this class many more times, so I created a ...
-1
votes
1answer
849 views

What is the difference between class level attributes, Class constants and singleton methods?

What the difference given they all exist 'once per class'. When should I use one over another, i.e. for what purpose? I use Ruby.
2
votes
1answer
1k views

const vs. readonly for a singleton

I have a singleton that anchors together some different data structures. Part of what I expose through that singleton are some lists and other objects, which represent the necessary keys or columns ...
22
votes
9answers
7k views

Alternatives to the singleton pattern

I have read different opinions about the singleton pattern. Some maintain that it should be avoided at all costs and others that it can be be useful in certain situations. One situation in which I ...
14
votes
7answers
9k views

What are the roles of singletons, abstract classes and interfaces?

I am studying OOP in C++ and, even though I am aware of the definitions of these 3 concepts, I cannot really realize when or how to use it. Let's use this class for the example: class Person{ ...
6
votes
4answers
1k views

C++ - Best way to have a central data repository

I'm coding in C++. I have a server that will have clients connect to it, and each client gets spun off into its own thread for communication. This server is hosting a game, so there is information ...
4
votes
1answer
848 views

DAO/Webservice Consumption in Web Application

I am currently working on converting a "legacy" web-based (Coldfusion) application from single data source (MSSQL database) to multi-tier OOP. In my current system there is a read/write database with ...
3
votes
3answers
9k views

Static class vs Singleton class in C# [duplicate]

Possible Duplicate: What is the difference between all-static-methods and applying a singleton pattern? I need to make a decision for a project I'm working of whether to use static or ...
9
votes
4answers
5k views

Dependency Injection and Singleton. Are they two entirely different concepts?

I've been hearing about using the dependency injection over Singleton for my colleague. I still can't make out if it they are two orthogonal patterns which can be replaced with one another? Or is DI a ...
1
vote
3answers
614 views

Memory problems with singletons in a test suite

I am having a memory leak when running a test suite due to singleton objects are created and not cleared after each test case. And these singleton objects are holding references to heavy objects. So ...
8
votes
4answers
469 views

Is there is a case when there is no any reasonable replacement for singleton design pattern? [duplicate]

Possible Duplicate: When is Singleton appropriate? I've seen many explanations why is Singleton is evil. But is there really no such a case when Singleton is the only beautiful solution?
0
votes
1answer
155 views

Is using Singleton correct for Jtree & DefaultTreeModel?

Basically I have one Tree view which uses a single DefaultTreeModel. Is it okay to use singleton for Tree extending JTree and another singleton for TreeModel extending DefaultTreeModel? If not, what ...
1
vote
6answers
2k views

Static classes and/or singletons — How many does it take to become a code smell? [closed]

In my projects I use quite a lot of static classes. These are usually classes that naturally seem to fit into a single-instance type of thing. Many times I use static classes and recently I've started ...
13
votes
3answers
2k views

Could a singleton type replace static methods and classes? [duplicate]

Possible Duplicate: What is the difference between all-static-methods and applying a singleton pattern? In C# Static methods has long served a purpose allowing us to call them without ...
12
votes
5answers
928 views

What to say to your boss if they want you to use a global variable

I am currently 4 months into an internship, and when reviewing my code, my boss didn't like that I had kept a specific object local to a number of methods across a few separate classes within one ...
26
votes
7answers
2k views

The Singleton Pattern [duplicate]

Possible Duplicate: When is Singleton appropriate? I am a new programmer (4 months into my first job) and have recently taken an interest in design patterns. One that I have used recently ...
16
votes
5answers
9k views

What is the difference between all-static-methods and applying a singleton pattern?

I am making a database to store information about the users of my website (I am using stuts2 and hence Java EE technology). For the database I'll be making a DBManager. Should I apply singleton ...
5
votes
2answers
380 views

Are the default objects of VB a type of singleton?

Are the default objects supported by My keyword in VB.net is a kind of singleton? If not, what is the difference? Again is this "default object" feature is something useful? If yes, then why it is ...
11
votes
4answers
947 views

Does “notification center” pattern encourage good or bad program design?

Sometimes I come across these message-hub-style APIs, for example the Cocoa NSNotificationCenter: ...
45
votes
5answers
4k views

When is Singleton appropriate?

Some hold that the Singleton Pattern is always an anti-pattern. What do you think?