Component context to be passed to a component via
::com::sun::star::lang::XSingleComponentFactory.
Arbitrary values (e.g. deployment values) can be retrieved from the context.
Components can implement XUnloadingPreference in order to indicate
how they should be treated when their hosting library is to be unloaded.
When someone calls rtl_unloadUnusedModules then the unloading
listeners are notified by calling previously registered callback
functions. A listener is an entity that employs, registers, and
unregisters the callback functions on its behalf. Upon notification
(the callback function is being called)
a listener may release references to UNO components. Thus, the
loaded libraries can be unloaded, if no one else keeps any
objects from the library alive.
Before a listener releases references, it should ask for this interface.
If the interface is not implemented, then the listener may release the
object; otherwise, it calls releaseOnNotification. If the function
returns false then the listener should keep the reference, otherwise
it may release it.
