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Luis
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 Posted: Thu Dec 11, 2003 2:34 pm Post subject: How to pass external parameters to an object |
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How should I pass external, non persistent, parameters to an object before
save?
I maintained information of the logged user, like his Username, person
identifier, and other session variables, and sometimes I need to validate
the object at Save method using these external parameters.
// StartData, EndData and ModifiedBy belong to the object (also they're
mapped to a phisical table)
Task.StartDate:= edStartDate.Date;
Task.EndData:= edEndDate.Date;
Task.ModifiedBy:= AppSession.UsernameStr;
Task.UserId:= AppSession.UserId; <--- Non TTask related field
Task.Save;
Currently I included UserId at the TTask class, but I think it is not ok,
because is occupying memory, is not related to the object lifetime, and it
is only needed for a specific operation (save).
Thanks for advices,
Luis.
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Marc Rohloff
Guest
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| Posted: Thu Dec 11, 2003 3:14 pm Post subject: Re: How to pass external parameters to an object |
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Luis wrote on Thu, 11 Dec 2003 11:34:10 -0300 ...
| Quote: | I maintained information of the logged user, like his Username, person
identifier, and other session variables, and sometimes I need to validate
the object at Save method using these external parameters.
Task.Save;
Currently I included UserId at the TTask class, but I think it is not ok,
because is occupying memory, is not related to the object lifetime, and it
is only needed for a specific operation (save).
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How do you do your saving? Does Task save itself or does it delegate to
some other object/class?
Generally you would want to make the userid available to the persistance
layers in some other way. Since this usually global to a session you
might want to set it on some sort of global object (The persistance
manager, provider or broker if you have one) Or maybe create a new
global session object for this sort of information.
Marc Rohloff
marc rohloff at bigfoot dot com
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Luis
Guest
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| Posted: Thu Dec 11, 2003 3:29 pm Post subject: Re: How to pass external parameters to an object |
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"Marc Rohloff" <dont (AT) mailme (DOT) com> wrote
Hello Marc,
| Quote: | How do you do your saving? Does Task save itself or does it delegate to
some other object/class?
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Task delegates the save operation to a persistance object (TDMObject ala
P.brown). I also call a Validate method, if the object requires 'BeforeSave'
validation:
procedure TTask.Save;
begin
Validate;
inherited Save; // it also delgates to the persistence layer
end;
| Quote: | Generally you would want to make the userid available to the persistance
layers in some other way. Since this usually global to a session you
might want to set it on some sort of global object (The persistance
manager, provider or broker if you have one) Or maybe create a new
global session object for this sort of information.
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Ok, I think I will go to a 'FrameworkManager' global object. I don't want to
put those variables at the persistance layer, because they are not related
with them but the object problem domain.
But I think I'll have problems at future, because this time the framework is
being used in a traditional c/s application, when it upsizing to a web
application, my global FrameworkManager.UserId will not work ;)
Thanks,
Luis.
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