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Currently there is a concept of provided services in {{ServiceManager}} which allows to provide services programmatically. These services have precedence over discovered services.
There are a couple of considerations:
* # Currently these services are neither started or stopped. I guess the assumption is that this is taken care of by the provider of the services. Personally I am not sure whether it would be better to mange the life cycle of these services as well.
* # the way to add a provided service is to get the map of existing provided services and add to it. eg {{configuration.getProvidedServices().put( FooService.class, new FooService() )}}. I think we should offer a dedicated method for that and make the getter return an unmodifiable map
* # there are several services which are completely internal. They should become internal provided services instead of being discovered via the {{ServiceLoader}}. This requires that we work out how the life cycle of provided services is supposed to work.
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