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From: jim_snead <basswoodNObaSPAM@my-deja.com.invalid>
Subject: Re: Is Apex dead as an environment for Ada & Java?
Date: 1999/11/30
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In article <38441AAE.29B2D8@hso.link.com>, "Samuel T. Harris"
<sam_harris@hso.link.com> wrote:
> One way to eliminate circular dependencies is to insure
> each interface is in a separate subsystem from its users.
> For instance, say I have two major code collections called
> X and Y. They both interface with each other, so X provides
> an interface which Y uses and Y provides an interface which
> X uses. If X's interface in packaged with X's code and similarly
> for Y, then we have a mutual import dependency.
> However, if I split the interfaces out into separate subsystems,
> say X_Iface, X_Model, Y_Iface, and Y_Model, then I eliminate
> the circular dependencies. If all models have a separate Iface
> subsystem, then I never get circular dependencies no matter
> what the interface topology. This also alows a natural release
> strategy of releasing updated interfaces independently. This
> allows all models to progress to the new interfaces in succession.
> This architecture is very flexible to a variety of scheduling
> paradims.

So specs go into the IFace and bodies go into the Model subsystems?




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