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From Marcel Offermans <>
Subject Re: Licensing model
Date Fri, 10 Aug 2012 10:26:32 GMT
Hello Mickael,

Sorry for not getting back to you sooner.

On Jul 24, 2012, at 13:50 , Mickael Marrache wrote:

> Company A wants to sell an application server to companies B and C. The
> application server consists of multiple bundles. For each company, many
> application servers may be installed on different nodes. So, on each node,
> I think there would be one Apache Felix instance and the bundles that
> compose the application server installed on it.

Yes. ACE can manage an OSGi framework if you install the "management agent" bundle in this
framework (this is called a "target" in ACE). You can either do that with a startup script,
or we have a version of Felix that "embeds" this management agent.

> But, for each application server installation, some bundles are provided
> following a license. For example, company B may have bought a license to
> use a certain bundle of the application server, that provides a particular
> service. Company C may have bought a more expensive license, therefore
> using the same bundle as B plus another bundle that provides another
> service.

Using the features and distributions of ACE, you can group certain bundles and configuration
files together to form such licenses. You can then associate a distribution (or more of them)
with a target (= an OSGi framework with management agent).

So for this example, you might have one "base" distribution with the plain application server,
and some "extra" distributions with the licensed add-ons.

> So, I need a way to differentiate the nodes (i.e. a node belongs to a
> particular customer). I also need a way to control which bundles are
> installed/used on a certain node following certain license information.

Targets (nodes) can be tagged with custom tags. It would therefore be easy to add a "customer=Foo"
to a target to associate it with a customer. You can then create a custom "association" between
a distribution and "any target that has the customer=Foo tag".

> Is it possible using Apache Ace? If yes, is it enough mature to be used in
> production?

We are using it in production in the Amazon Cloud. We are using trunk now, and we are working
hard on getting a "1.0" release done. There definitely are still some rough edges though.

Greetings, Marcel

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