BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  maintenance problem for customized application          BorlandTalk.com Forum Index -> Delphi OO design View previous topic :: View next topic   Author Message Roland Guest Posted: Mon Apr 02, 2007 5:46 am    Post subject: maintenance problem for customized application Hi: We have an application used by many customers. Some customers want their own special requirements which cause we modify the code and create special versin for these customers. Now there are about 50 special versions already. Usually we use directive to build up special version, like {$IFDEF CUSTOMER_A}do customer procedure ($ENDIF}. With so many special requirements, it causes our maintenance headech, especially for some major procedure, like saverecord for example it contains many directives. procedure saverecord; begin {$ifdef customer_a} do customer_a procedure; {$else} do general procedure; {$endif} {$ifdef customer_b} do customer_b procedure {$else} {$ifndef customer_c} do general procedure 2 {$endif} {$endif} end; Imagine the saverecord procedure already have more then 10 directives and could be more and more, so any small changes could cause bugs and sometime we have to test for every directive. Is there any way to use OOP idea to minimise these problem? Thanks. Roland Back to top Joanna Carter [TeamB] Guest Posted: Mon Apr 02, 2007 4:04 pm    Post subject: Re: maintenance problem for customized application Roland a écrit : Quote: We have an application used by many customers. Some customers want their own special requirements which cause we modify the code and create special versin for these customers. Now there are about 50 special versions already. Usually we use directive to build up special version, like {$IFDEF CUSTOMER_A}do customer procedure ($ENDIF}. With so many special requirements, it causes our maintenance headech, especially for some major procedure, like saverecord for example it contains many directives. procedure saverecord; begin {$ifdef customer_a} do customer_a procedure; {$else} do general procedure; {$endif} {$ifdef customer_b} do customer_b procedure {$else} {$ifndef customer_c} do general procedure 2 {$endif} {$endif} end; Imagine the saverecord procedure already have more then 10 directives and could be more and more, so any small changes could cause bugs and sometime we have to test for every directive. Is there any way to use OOP idea to minimise these problem? Thanks. Absolutely! Design a factory class that loads a runtime package that can be hold a class that holds the custom methods. Then all you have to do is to add each customer's packages to a predetermined location. To do this well, you need to have a well-defined class hierarchy from which each customer's special classes can derive. Joanna -- Joanna Carter [TeamB] Consultant Software Engineer Back to top Roland Guest Posted: Tue Apr 03, 2007 5:50 am    Post subject: Re: maintenance problem for customized application Thanks Joanna, I will have a try. Roland Back to top Bryan Crotaz Guest Posted: Sat Apr 07, 2007 9:00 pm    Post subject: Re: maintenance problem for customized application Extending what joanna said, I'd use the strategy pattern. Have the ability for objects to be registered for certain events (eg BeforeSave, AfterSave), with an appropriate interface: eg DLL exported procedure: procedure Register(AppServices: IAppServices); begin AppServices.Register('BeforeSave', TCustomerASaver as IBeforeSave); AppServices.Register('AfterSave', TCustomerASaver as IAfterSave); end; Back to top Roland Guest Posted: Wed Apr 11, 2007 8:13 am    Post subject: Re: maintenance problem for customized application Thanks Bryan, I will have a try. Roland "Bryan Crotaz" <bryan@inspiredsignage-not.at-all.com> wrote in message news:4617c039$1 (AT) newsgroups (DOT) borland.com... Quote: Extending what joanna said, I'd use the strategy pattern. Have the ability for objects to be registered for certain events (eg BeforeSave, AfterSave), with an appropriate interface: eg DLL exported procedure: procedure Register(AppServices: IAppServices); begin AppServices.Register('BeforeSave', TCustomerASaver as IBeforeSave); AppServices.Register('AfterSave', TCustomerASaver as IAfterSave); end; Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi OO design All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.