Re: [cdi-dev] Adding Lambdas as CDI beans

Am 17.10.2015 um 11:06 schrieb David Blevins <david.blevins(a)gmail.com&gt;: In brainstorming mode about fun that could be made possible with Java 8 and Java EE. Question in my mind is: is there some way we could make it possible for Lambdas or Method Refs to be CDI beans? It goes against the grain obviously as CDI creation is very much a “Don’t call us, we’ll call you” kind of thing. The VM dynamically creates a wrapper object around the Lambda or method reference and it implements the given interface. To make it work, there would need to be some non-producer method way of saying “put this thing in the context with these qualifiers”. Imagine a method somewhere that would allow you to: public <T> void addObserver(java.util.function.Consumer<T> observer, Annotation... qualifiers); Then you could take advantage as follows: final List<URI> uris = new ArrayList<>(); // @Observes URI addObserver((Consumer<URI>) uris::add); // @Observes Thread addObserver(Runtime.getRuntime()::addShutdownHook); // @Observes Runnable addObserver((Consumer<Runnable>) Executors.newFixedThreadPool(3)::submit); // @Observes URI addObserver((Consumer<URI>) System.out::println, new AnnotationLiteral<Fine>() { }); // @Observes Handler final Logger logger = Logger.getLogger("somewhere"); addObserver(logger::addHandler); // add handlers via event // @Observes @Fine String addObserver((Consumer<String>) logger::fine, new AnnotationLiteral<Fine>() {}); } -David -- David Blevins http://twitter.com/dblevins http://www.tomitribe.com _______________________________________________ cdi-dev mailing list cdi-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/cdi-dev Note that for all code provided on this list, the provider licenses the code under the Apache License, Version 2 (http://www.apache.org/licenses/LICENSE-2.0.html). For all other ideas provided on this list, the provider waives all patent and other intellectual property rights inherent in such information.