Marc Portier wrote:
Reinhard Poetz wrote:
Today, Jorg and I had a long chat about this. In short, we failed to
find a solution that works with Maven 2 as it is today. The problem is
that Cocoon block requirements have a different purpose than Maven 2
dependencies. Cocoon block requirements desribe what a block needs to
run while Maven 2 dependencies describe what a project needs to compile.
Additionally we want to describe our dependencies as contracts and not
as direct dependencies to a JAR.
how is that different?
well, in Cocoon we don't have "direct" dependencies between blocks. A Cocoon
block only requires other blocks that implement a certain contract. Have a look
at this example:
<block xmlns="http://apache.org/cocoon/blocks/cob/1.0";
id="http://cocoon.apache.org/blocks/anyblock/1.0";>
<requirements>
<requires
interface="http://cocoon.apache.org/contracts/portal/1.0";
name="portal"
default="http://cocoon.apache.org/blocks/portal/1.0.2";
/>
</requirements>
</block>
Here the block "http://cocoon.apache.org/blocks/anyblock/1.0"; requires a block
that implements the contract "http://cocoon.apache.org/contract/portal/1.0";.
One block that obiously implements this contract is
"http://cocoon.apache.org/blocks/portal/1.0.2";.
Compare this with a Maven project descriptor. There we say which *concrete"
dependencies (jars, blocks) one project has. In this special case this is a
block dependency.
> I would guess this just means your 'contract' is available in a separate
> jar/artifact from your implementation?
I'm not sure if I understand completly what you're asking/suggesting here. Do
you mean that we should make the contract a JAR dependency too?
> is that a constraint that is hard to keep up with?
I'm not sure. I have to think more about it. In any case, having the contracts
as JAR dependencies is an interesting thought!
--
Reinhard Pötz Independent Consultant, Trainer & (IT)-Coach
{Software Engineering, Open Source, Web Applications, Apache Cocoon}
web(log): http://www.poetz.cc
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