I have found a (slightly hacky) solution be using an OrderedConfiruration and
adding a getTopic() to my Authorizer interface.
public interface Authorizer {
public String getTopic();
public boolean authorize(Context context);
}
public void contributeAuthorizers(OrderedConfiguration<Authorizer> config) {
config.add("auth1", new Authorizer1("topic1"));
config.add("auth2", new Authorizer1("topic1"), "before:auth1");
config.add("auth3", new Authorizer1("topic2"));
config.add("auth4", new Authorizer1("topic2"), "before:auth3");
}
public void buildAuthorizers(List<Authorizer> authorizers) {
MultiMap multimap = new HashMultiMap<String, Authorizer>();
for (Authorizer auth : authorizers) {
multimap.put(auth.getTopic(), auth);
}
return new AuthorizersImpl(multimap);
}
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