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0
votes
5answers
558 views

should singleton be life-time available or should it be destroyable?

Should the singleton be designed so that it can be created and destroyed at any time in program or should it be created so that it is available in life-time of program. Which one is best practice? ...
3
votes
2answers
942 views

null values vs “empty” singleton for optional fields

First of all I'm developing a parser for an XML-based format for 3D graphics called XGL. But this question can be applied to any situation when you have fields in your class that are optional i.e. the ...
1
vote
3answers
247 views

Name for Osherove's modified singleton pattern?

I'm pretty well sold on the "singletons are evil" line of thought. Nevertheless, there are limited occurrences when you want to limit the creation of an object. Roy Osherove advises, If you're ...
25
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 ...
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?
4
votes
1answer
815 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 ...
0
votes
2answers
235 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
483 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
812 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.
14
votes
7answers
8k 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{ ...
20
votes
9answers
6k 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 ...
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 ...
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 ...
1
vote
3answers
592 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
467 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
154 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 ...
5
votes
2answers
375 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
919 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: ...