[jboss-as7-dev] OSGi subsystem dependencies

This was talked about briefly on the pull request list, but no resolution was made. The issue is that JBAS-8585 and JBAS-8599 both add module dependencies from some of the core subsystems on to the osgi subsystem (naming and transactions). In addition we already have a module dependency from domain to osgi. So for all intents and purposes, we are moving towards AS7 having osgi as a required base level component. Before progressing much further in this direction we should evaluate whether this is the right thing to do, and how this solution compares to alternative approaches. I can think of three approaches right off the bat. 1. Continue as is, osgi is a core required component Pros: OSGi subsystem module is simpler, no additional subsystems or modules needed Cons: AS7 must always have OSGi binaries no matter the configuration 2. Change the osgi subsystem to use optional dependencies on all of the subsystems it maps. Pros: No additional subsystems are needed AS7 no longer requires OSGi binaries Cons: osgi subsystem code will need to do a lot of conditional checking for handling different subsystems being available 3. Create an osgi subsystem per subsystem it wraps (e.g. osgi-naming, osgi-transactions, etc) Pros: OSGi subsystem code is simpler AS7 no longer requires OSGi binaries Cons: More subsystems are introduced, almost one per functional subsystem. Let the debate begin :) -- Jason T. Greene JBoss, a division of Red Hat