Alexi Polenur wrote:
>Hi all,
>
> I just started discovering Avalon framework, and I
>have a question described in the title of this email.
>
> I think I can understand potential difference
>between notion of component and service.
> IMHO the Component and Service are very closely
>related concepts or rather two different view or
>prospective on the same consept.
>
Correct. The service package was introduced as a candidate replacement
of the coponent package in order to eliminate artifical implications
introduced my the Component interface. In all respects the component
package and service package are equivilent with the exception that
Component is replaced by java.lang.Object in the service package.
>The both refer to the
>"reusable", "replaceable", "interchangeable" chunk of
>software. The difference is that term Component is
>used to look at the concept from the "structural"
>prospective when term service used to emphasize
>"behavior" aspect of the concept. In other words
>Service is a Component which exposes set of behaviors.
>
Nope - sorry about the confusion here - the service package is
functionally the smae as the component package - no semantic
differences. The service package is the preferred approach and as work
on the container side of things nears completion, wel will probably
deprecate the component package and clearly document the reasons,
rationale and replacements under the service package.
> Even though I would be really interested to hear
>your comments on my understanding (right or wrong) of
>consepts of Service and Component, my real question is
>more practicle.
>
> The question is not "What the difference between
>Component and Service concepts" but rather "What the
>reason of having two very similar set of interfaces
>one in package org.apache.avalon.framework.component
>and another in org.apache.avalon.framework.service".
> Looking at the interfaces and JavaDoc description it
>seems to me that this two packages are modeling very
>similar abstractions.
>
>
I hope that clears it up for you.
Cheers, Steve.
>Thanks in advance Alexi
>
>
>
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