I'm working on Guice bindings for MongoDB's new async driver. The goal is
to be able to call, e.g.
mongoModule.bindCollection("myCollection", MyDocument.class)
and then be able to inject
@Named("myCollection") MongoCollection<MyDocument>
I have this working just fine, but I'm actually implementing the JDK's
ParameterizedType to do it (code below).
Any reason this is a bad way to go about it, or that this approach might
explode on some future version of Guice? It appears to work fine - things
are injected as they should be - but implementing ParameterizedType is a
little out-there.
I did this for the older MongoDB driver by forcing the caller to pass a
TypeLiteral, which is a bit ugly since they're also passing the type
parameter as a Class object. So this results in a nicer API.
Thanks,
Tim
MongoTypedCollectionProvider<T> typedProvider = new
MongoTypedCollectionProvider<T>(dbProvider, collection, type,
knownProvider, opts, inits);
Type t = new FakeType<>(type);
Key<MongoCollection<T>> key = (Key<MongoCollection<T>>)
Key.get(t, Names.named(bindingName));
binder.bind(key).toProvider(typedProvider);
static class FakeType<T> implements ParameterizedType {
private final Class<T> genericType;
public FakeType(Class<T> genericType) {
this.genericType = genericType;
}
@Override
public String getTypeName() {
return MongoCollection.class.getName();
}
@Override
public Type[] getActualTypeArguments() {
return new Type[]{genericType};
}
@Override
public Type getRawType() {
return MongoCollection.class;
}
@Override
public Type getOwnerType() {
return null;
}
}
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