Multibindings are the way Guice is implementing plug-in mechanism.
The best I can think of is having a single SetBinder and add all
pluggable classes there.
Then implement your own methods which iterate over all binded classes
and filter for the criteria you need.
class Fruity {
@Inject Set<Object> fruits;
Set<HasSeed> getAllFruitsWithSeed() {
Set<HasSeed> result = new HashSet<>();
for (Object candidate : fruits) {
if (candidate instanceof HasSeed) {
result.add((HasSeed) candidate);
}
}
}
On 05.06.2018 23:57, 'Mariano Gonzalez' via google-guice wrote:
Hello,
I want to perform a hierarchical lookup. Suppose I have the following
code:
|
bind(Apple.class).in(Singleton.class);
bind(Banana.class).in(Singleton.class);
bind(Grape.class).in(Singleton.class);
|
Now suppose that Apple and Grape implement the JuiceFactory interface,
which Banana does not.
How do I programmatically lookup all the JuiceFactory instances? In
Spring there's a getBeansOfType() method which allows for any random
hierarchical queries, I'm wondering how to achieve the same with
Guice. Reason why I need this is that my modules will be pluggable so
I don't know the fruits I'll be handling before hand. Also, I might
later want to do a lookup by the HasSeed interface, where I also
expect the Apple and Grape instances to be returned, so MultiBinder is
not really an option.
Thanks!
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