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Singleton Patterns, where do I put it?Hello,
I am working on a 3teired project, data,bizlogic, userinterface...I have a global class that at current is being passed around as parameters, this is, to say the least messy... I am reading up about singletons, but I wonder where to place it? Should I stick it in with the userinterface....how do I make it globally accessable if its in a different layer/project... Sorry if I sound like a noob, I am noob... Thank you John If the singleton is used for UI bits, then the UI project (web project,
winforms project) is the correct place. The example here would be application settings for the UI. If not, then it does not belong there. It belongs in the layer where it is used. If it is database settings, you can guess where it goes. If neither DB nor UI, it is probably a business object. I say probably, as you may be using a facade pattern and have it there (not as likely). Short answer: Need to know more about what you are placing in the singleton to answer more concretely. -- Show quoteGregory A. Beamer MVP, MCP: +I, SE, SD, DBA ************************************************* | Think outside the box! | ************************************************* "John Sheppard" <spam@nospam.com> wrote in message news:fhtvkp0r2m@news2.newsguy.com... > Hello, > > I am working on a 3teired project, data,bizlogic, userinterface...I have a > global class that at current is being passed around as parameters, this > is, to say the least messy... > > I am reading up about singletons, but I wonder where to place it? Should I > stick it in with the userinterface....how do I make it globally accessable > if its in a different layer/project... > > Sorry if I sound like a noob, I am noob... > Thank you > John > > > Thanks Cowboy...
Sorry my server was lagging at work and didnt see your response... Im still learning about patterns, at current the singleton is the first pattern im implementing... At current it is a Business object so its going there...I know we have some bad architecture issues which im working through, so its kinda half UI half BO...but it will in the end be a BO layer... Thanks once again, good answer, I very much appreciate it John Show quote "Cowboy (Gregory A. Beamer)" <NoSpamMgbworld@comcast.netNoSpamM> wrote in message news:%231S3dV$KIHA.4272@TK2MSFTNGP06.phx.gbl... > If the singleton is used for UI bits, then the UI project (web project, > winforms project) is the correct place. The example here would be > application settings for the UI. > > If not, then it does not belong there. It belongs in the layer where it is > used. If it is database settings, you can guess where it goes. If neither > DB nor UI, it is probably a business object. I say probably, as you may be > using a facade pattern and have it there (not as likely). > > Short answer: Need to know more about what you are placing in the > singleton to answer more concretely. > > -- > Gregory A. Beamer > MVP, MCP: +I, SE, SD, DBA > > ************************************************* > | Think outside the box! | > ************************************************* > "John Sheppard" <spam@nospam.com> wrote in message > news:fhtvkp0r2m@news2.newsguy.com... >> Hello, >> >> I am working on a 3teired project, data,bizlogic, userinterface...I have >> a global class that at current is being passed around as parameters, this >> is, to say the least messy... >> >> I am reading up about singletons, but I wonder where to place it? Should >> I stick it in with the userinterface....how do I make it globally >> accessable if its in a different layer/project... >> >> Sorry if I sound like a noob, I am noob... >> Thank you >> John >> >> >> > > If you want a decent enough, and cheap enough, set of patterns in a "real
world" application, consider looking at dofactory.com and purchasing the Pattern Framework. I disagree with parts of the implementation, but it is a great learning tool. It implements nearly every pattern, somewhere, and illustrates the use of a facade between business and UI, which is rather nice. My biggest issue is with the implementation of the data layer, as I feel it is a bit too complex for a maintainable solution, but it does work as a basic pattern. -- Show quoteGregory A. Beamer MVP, MCP: +I, SE, SD, DBA ************************************************* | Think outside the box! | ************************************************* "John Sheppard" <nospam@spamspam.com> wrote in message news:fi0nj6023fq@news4.newsguy.com... > Thanks Cowboy... > > Sorry my server was lagging at work and didnt see your response... > > Im still learning about patterns, at current the singleton is the first > pattern im implementing... > > At current it is a Business object so its going there...I know we have > some bad architecture issues which im working through, so its kinda half > UI half BO...but it will in the end be a BO layer... > > Thanks once again, good answer, I very much appreciate it > John > > "Cowboy (Gregory A. Beamer)" <NoSpamMgbworld@comcast.netNoSpamM> wrote in > message news:%231S3dV$KIHA.4272@TK2MSFTNGP06.phx.gbl... >> If the singleton is used for UI bits, then the UI project (web project, >> winforms project) is the correct place. The example here would be >> application settings for the UI. >> >> If not, then it does not belong there. It belongs in the layer where it >> is used. If it is database settings, you can guess where it goes. If >> neither DB nor UI, it is probably a business object. I say probably, as >> you may be using a facade pattern and have it there (not as likely). >> >> Short answer: Need to know more about what you are placing in the >> singleton to answer more concretely. >> >> -- >> Gregory A. Beamer >> MVP, MCP: +I, SE, SD, DBA >> >> ************************************************* >> | Think outside the box! | >> ************************************************* >> "John Sheppard" <spam@nospam.com> wrote in message >> news:fhtvkp0r2m@news2.newsguy.com... >>> Hello, >>> >>> I am working on a 3teired project, data,bizlogic, userinterface...I have >>> a global class that at current is being passed around as parameters, >>> this is, to say the least messy... >>> >>> I am reading up about singletons, but I wonder where to place it? Should >>> I stick it in with the userinterface....how do I make it globally >>> accessable if its in a different layer/project... >>> >>> Sorry if I sound like a noob, I am noob... >>> Thank you >>> John >>> >>> >>> >> >> > I answered my own question...it works good!
I just put it in my Business Logic layer cause all lower layers use it... Thanks for anyone who read my message... Show quote "John Sheppard" <spam@nospam.com> wrote in message news:fhtvkp0r2m@news2.newsguy.com... > Hello, > > I am working on a 3teired project, data,bizlogic, userinterface...I have a > global class that at current is being passed around as parameters, this > is, to say the least messy... > > I am reading up about singletons, but I wonder where to place it? Should I > stick it in with the userinterface....how do I make it globally accessable > if its in a different layer/project... > > Sorry if I sound like a noob, I am noob... > Thank you > John > > >  |
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