[equinox-dev] Activate component only after another component's state is

[Luciana Alvite <luciana.alvite@xxxxxxxxx>]

Hello dear fellow OSGi devs,

I have the following simplified scenario in my Declarative Services based project:

2 Components: Network and Login
Login depends on 1..1 Network component. Network takes care of connecting and disconnecting from a given network.




I would like to make the Login component dependency on Network
satisfied only when the Network is actually connected, meaning the
component would only be activated after the "network.connect()" method
is successfully executed.

Approaches I have tried:
 - ConfigAdmin > Setting a property
"isConnected" for the Network component using the ConfigAdmin when the
"connect" method is successfully executed
Result: Does not work,
since changing the properties will require a reactivation of the
Network component, therefore recreating the component and losing the
connection.

- Events > Make login implement EventHandler and listen to
Network events. When event is "connected", react accordingly. the
problem here is that the component must be enabled to be able to
actually receive events. and this goes against the goal of only
activating the component AFTER the network is connected..

I have tried google, read the specs several times but could not yet
think of any suitable implementation , any ideas of how I could solve
this?

Thanks in advance for any help or pointers!

-- 
Best Regards

Luciana Alvite