Type safe selection of cache used by the JCache interceptors

Currently the name of the cache which will be used by the JCache interceptors has to be specified in JCache annotations (e.g. @CacheResult(cacheName="greeting-cache")).

This can be error prone (typo, refactoring ...). The CDI integration module provides the possibility to associate a qualifier to a cache. This qualifier could be re-used to provide a type safe selection of the cache used by a JCache interceptor. Something like:

public class GreetingService {

    @CacheResult @GreetingCache
    public String greet(String name) {
        return "Hello" + name;
    }
}

Here we need to be in sync with JCache specification. In my understanding of the spec the cache name is required for @CacheRemoveEntry and @CacheRemoveAll (but currently in the API there is a default value initialized to blank). For @CacheResult if no cache name is defined a default one is used.