[wildfly-dev] JBoss MSC Plans

Hi everyone, I would like to outline a brief JBoss MSC Plans for Year 2018. Goals defined below address both: * Cloud First Effort - Reduce WildFly memory footprint - Speed up WildFly boot time * Potential Migration to MSC 2 MSC Library Goals: * SHORT TERM GOALS (MSC 1.2.x, 1.3.x) [1] simplify MSC state machine - deprecate useless MSC internal states (e.g. REMOVED, WONT_START, WAITING, REMOVING, STOPPING maybe others) [2] deprecate API exposing MSC internals (e.g. replace ServiceListener with LifecycleListener) [3] deprecate MSC Values, Injections & Injectors and provide alternative API (alternative API should have same minimalistic memory requirements like MSC 2) * LONG TERM GOALS (MSC 1.4.x) [4] remove deprecated APIs and all deprecated stuff WildFly MSC Integration Goals: + SHORT TERM GOALS (WildFly 12) * replace ServiceListeners with LifecycleListeners (LifecycleListeners don't expose MSC internals) * eliminate MSC optional dependencies from WildFLy Core * eliminate MSC Values, Injections & Injectors and migrate to alternative API * WildFly Management Layer should not expose MSC APIs as its public API (complicates potential migration to MSC2 and breaks encapsulation) + LONG TERM GOALS (WildFly versions targeting next major EAP) * eliminate MSC optional dependencies from WildFly (probably via Capabilities) (MSC Optional Dependencies have been fixed recently but there's still performance issue - in worst case scenario if service A has N optional dependencies it may happen service A is restarted N times before it is stabilized in UP state) Feedback and comments more than welcome! -- Rio