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Please correct me if I am wrong but if I am trying to summerise the functionlity of IoC (DI specific), then it is some clever mechanisim to pass configuration data into my newly created objects.
If this it true what if I want to use some precreated objects to intialise my objects (What seems to me a much more general case then to create newly initialized object)
Most of my objects are created in Spring and I don`t have to retrieve them from somewhere else. But there are ways to pull beans outside of Spring into Spring. Check the FieldRetrievingFactoryBean for example.Quote:
Originally Posted by litterat
What are you trying to do? What objects do you want to pull into Spring?
DI-wise it's a bit more - it also allows you to define linkage between objects, not just configuration data. See http://martinfowler.com/articles/injection.htmlQuote:
Please correct me if I am wrong but if I am trying to summerise the functionlity of IoC (DI specific), then it is some clever mechanisim to pass configuration data into my newly created objects.
But what does pre-created mean? At startup time? Spring can insert beans created at startup time into newly created objects.Quote:
If this it true what if I want to use some precreated objects to intialise my objects
I will give a simple example.Quote:
What are you trying to do? What objects do you want to pull into Spring?
Lets say I have a report object that print a message,
the message is created from user input
I see no way for Spring to help me in intaiting the message object nor the report object
The problem is that the dependenicies of an object usually are not decided in creation time but might allready exist in the system
You can possibly use a factory method. See this thread: http://forum.springframework.org/showthread.php?t=17634
Anybody can outline to me the way you would do this in SpringQuote:
I will give a simple example.
Lets say I have a report object that print a message,
the message is created from user input
Could you give a more detailed example? And remember: Spring is not responsible for creating all objects (else Spring would be a nightmare to use).Quote:
Originally Posted by litterat
Try to make this clear in your example.Quote:
The problem is that the dependenicies of an object usually are not decided in creation time but might allready exist in the system