Hi, iPOJO provides different ways to handle optional (scalar) dependencies. When a service is unavailable, iPOJO can inject: - a Nullable object as in Dependency Manager - null - an object from a default implementation
In the last option, iPOJO creates an object from the specified default-implementation and injects this object when the required service is unavailable. Clement -----Original Message----- From: Richard S. Hall [mailto:[EMAIL PROTECTED] Sent: jeudi 18 septembre 2008 22:27 To: [email protected] Subject: Re: DependencyManager - dependencies restricted to interfaces peter.doornbosch wrote: > Hi Marcel, > >> Up to now I have not had anybody use it with services that are not >> interfaces, but I would not mind adding support for that. Obviously >> in that case I cannot support that null object pattern >> "automatically" anymore (automatically meaning me creating a proxy >> that does nothing) but I could: >> a) let the user supply some kind of factory method to supply a proxy >> b) add an option to completely turn off the creation of null objects >> c) anything reasonably that's suggested here :) > > (a) would be a good idea anyway, because it would make it possible to > use other null objects than the default ones the dep. mgr. provides. > For example, in some cases i would like to have a "null" object for a > LogService that prints to system out. Other examples are proxies that > throw exceptions on any invoked method, etc. Agreed. This is a useful feature. We added something similar to iPOJO so that you can specify a "default service implementation" in such situations. -> richard > > Regards > Peter > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
