Hi Alex, 1 of the smaller suggestions in my blogpost ( https://devcreativity.wordpress.com/2019/03/02/java-modules-wish-list-provide-services-using-lambda-functions-and-more/) was to pass in the class of the expected service type as a parameter into the provider method if the signature is defined with a Class as single parameter. This little extension of the convention would allow already a lot more flexibility. Would it be possible to consider it?
Thanks, Tom - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Op ma 4 mrt. 2019 om 21:27 schreef Alex Buckley <alex.buck...@oracle.com>: > Hi Tom, > > Nice to see thoughts about modular services. > > FYI Jigsaw's goals in this area were quite limited > (http://openjdk.java.net/projects/jigsaw/spec/reqs/#services) and the > static provider method was a relatively late add-on > (http://openjdk.java.net/projects/jigsaw/spec/issues/#services). > > I agree that a static provider method offers a basic level of > indirection (e.g. multiple `provides` directives can employ the same one > if its return type implements multiple services) but it doesn't add much > in the way of abstraction (e.g. over the desired service). This isn't > the only place where ServiceLoader suffers from a lack of abstraction: > you can't parameterize services because there's no way to request an > implementation of a parameterized service (i.e. you can't say > `ServiceLoader.load(ServiceA<Foo>.class)`). > > Frankly, we are not likely to revisit any of these limitations in the > near future, but I think that ServiceLoader will always be a handy > built-in option for limited use cases. > > Alex > > On 3/2/2019 9:19 AM, Tom De Wolf wrote: > > The current ServiceLoader mechanism and Java Modules have a limited set > of > > options to provide an instance for a service from a module. Or you use > the > > constructor, or you use a static 'provider' method. > > > > When interacting with frameworks like Spring this does not give a lot of > > flexibility. I described the problem statement and some ideas which could > > be considered for evolving the services support in the module system in > > this blog post: > > > > > https://devcreativity.wordpress.com/2019/03/02/java-modules-wish-list-provide-services-using-lambda-functions-and-more/ > > > > > > I would appreciate if some of the oracle contributors that worked on the > > module system could read the post and provide me and the community with > > some feedback if such a change could be a good idea? > > > > Thanks in advance > > > > Tom > > >
