Re: What is Inversion of Control (IoC)
Nyimi Jose wrote: More and more my fellow Java's friends tell me about IoC. What is IoC in Perl world ? Examples ? Here are some links about IoC a friend gave to me : http://picocontainer.org/ioc.html http://jakarta.apache-korea.org/avalon/framework/guide-patterns-ioc.html http://www.springframework.org/docs/lightweight_container.html http://javangelist.snipsnap.org/space/IoC Hi José. This pairs nicely with Kevin's question about callbacks, because that's essentially what IoC is. In the classic model the code know all about the structure of the program as a whole and where to find the functions it needs. You will code your Perl program to call a particular member function from a specific package. In IoC your code only needs to declare what it's able to do and the lower-level software will decide when to call it. In Joseph's 'sort' example in the 'What is a callback' thread the compare function just sets itself up, saying 'I can tell you which order a pair of values should be in'. It then sits back and waits to be summoned. Another obvious IoC situation is in Windows programming, where the program is effectively just a fixed set of subroutines that Windows needs to call at the appropriate time. But don't go trying to write code using IoC just because somebody's recently thought of a name for it. The idea's been around a long time and it isn't often a good way to write stuff. HTH, Rob -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: What is Inversion of Control (IoC)
Hi Rob, Indeed the question i had in mind while posting was should i care about IoC while developping in Perl ?. Your answer seems to be *no*. Then how can i argue to my friends that IoC is not often a good way to write stuff. Have you some examples ? José. -Original Message- From: Rob Dixon [mailto:[EMAIL PROTECTED] Sent: Monday, November 24, 2003 11:51 AM To: [EMAIL PROTECTED] Subject: Re: What is Inversion of Control (IoC) Nyimi Jose wrote: More and more my fellow Java's friends tell me about IoC. What is IoC in Perl world ? Examples ? Here are some links about IoC a friend gave to me : http://picocontainer.org/ioc.html http://jakarta.apache-korea.org/avalon/framework/guide-patterns-ioc.ht ml http://www.springframework.org/docs/lightweight_container.html http://javangelist.snipsnap.org/space/IoC Hi José. This pairs nicely with Kevin's question about callbacks, because that's essentially what IoC is. In the classic model the code know all about the structure of the program as a whole and where to find the functions it needs. You will code your Perl program to call a particular member function from a specific package. In IoC your code only needs to declare what it's able to do and the lower-level software will decide when to call it. In Joseph's 'sort' example in the 'What is a callback' thread the compare function just sets itself up, saying 'I can tell you which order a pair of values should be in'. It then sits back and waits to be summoned. Another obvious IoC situation is in Windows programming, where the program is effectively just a fixed set of subroutines that Windows needs to call at the appropriate time. But don't go trying to write code using IoC just because somebody's recently thought of a name for it. The idea's been around a long time and it isn't often a good way to write stuff. HTH, Rob -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] DISCLAIMER This e-mail and any attachment thereto may contain information which is confidential and/or protected by intellectual property rights and are intended for the sole use of the recipient(s) named above. Any use of the information contained herein (including, but not limited to, total or partial reproduction, communication or distribution in any form) by other persons than the designated recipient(s) is prohibited. If you have received this e-mail in error, please notify the sender either by telephone or by e-mail and delete the material from any computer. Thank you for your cooperation. For further information about Proximus mobile phone services please see our website at http://www.proximus.be or refer to any Proximus agent. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: What is Inversion of Control (IoC)
On Nov 24, 2003, at 5:08 AM, NYIMI Jose (BMB) wrote: Hi Rob, Indeed the question i had in mind while posting was should i care about IoC while developping in Perl ?. Your answer seems to be *no*. I think you're over generalizing here. First, this isn't a Perl issue, specifically, you could ask the same question of any development tool. The correct answer is probably just as general, Sure, you should care about IoC when it makes sense to and leave it at home the rest of the time. Then how can i argue to my friends that IoC is not often a good way to write stuff. Have you some examples ? Well, grab a book on Design Patterns and recommend some of the others. They all have their uses. James -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: What is Inversion of Control (IoC)
Nyimi Jose wrote: Hi Rob, Indeed the question i had in mind while posting was should i care about IoC while developping in Perl ?. Your answer seems to be *no*. Then how can i argue to my friends that IoC is not often a good way to write stuff. Have you some examples ? As James says, it's not a language question: Perl can do callbacks too! But it's never a good idea to program according to this month's buzzword. It's an advanced decision to choose IoC over normal threaded code. Ask your friends where they would use it and how and, when they burble, just understand that they've simply hit on a fad. Rob -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: What is Inversion of Control (IoC)
rob Ask your friends where they would use it and how and, when they burble, just understand that they've simply hit on a fad. /rob Yes! I will do :-) José. -Original Message- From: Rob Dixon [mailto:[EMAIL PROTECTED] Sent: Monday, November 24, 2003 5:15 PM To: [EMAIL PROTECTED] Subject: Re: What is Inversion of Control (IoC) Nyimi Jose wrote: Hi Rob, Indeed the question i had in mind while posting was should i care about IoC while developping in Perl ?. Your answer seems to be *no*. Then how can i argue to my friends that IoC is not often a good way to write stuff. Have you some examples ? As James says, it's not a language question: Perl can do callbacks too! But it's never a good idea to program according to this month's buzzword. It's an advanced decision to choose IoC over normal threaded code. Rob -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] DISCLAIMER This e-mail and any attachment thereto may contain information which is confidential and/or protected by intellectual property rights and are intended for the sole use of the recipient(s) named above. Any use of the information contained herein (including, but not limited to, total or partial reproduction, communication or distribution in any form) by other persons than the designated recipient(s) is prohibited. If you have received this e-mail in error, please notify the sender either by telephone or by e-mail and delete the material from any computer. Thank you for your cooperation. For further information about Proximus mobile phone services please see our website at http://www.proximus.be or refer to any Proximus agent. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
