Hi dear Guice users,
My problem is that i can't locate a generic service at runtime. To
illustrate this issue i have
written a testcase.
I am currently stuck in the method
private Butler<Person> findButler(Person person, Injector injector). I
don't know how
to get an instance for Butler<personClass>, where personClass is only
known at runtime.
I also tried searching the forum but could't find anything.
Here's the testcase:
import junit.framework.TestCase;
import com.google.inject.AbstractModule;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.TypeLiteral;
public class GuiceInjectServiceTest extends TestCase {
private static abstract class Person {
}
private static class BigPerson extends Person {
}
private static class SmallPerson extends Person {
}
public interface Butler<T extends Person> {
String serve(T person);
}
public static class BigPersonButler implements Butler<BigPerson>{
@Override
public String serve(BigPerson person) {
return "Beer";
}
}
public static class SmallPersonButler implements Butler<SmallPerson>{
@Override
public String serve(SmallPerson person) {
return "Water";
}
}
public void testGetInstance() throws Exception {
Injector injector = Guice.createInjector(new AbstractModule() {
@Override
protected void configure() {
bind(new TypeLiteral<Butler<BigPerson>>() {
}).to(BigPersonButler.class);
bind(new TypeLiteral<Butler<SmallPerson>>() {
}).to(SmallPersonButler.class);
}
});
BigPerson bigPerson = injector.getInstance(BigPerson.class);
Butler<Person> butler = findButler(bigPerson, injector);
String drink = butler.serve(bigPerson);
assertEquals("Beer", drink);
}
private Butler<Person> findButler(Person person, Injector injector){
Class<? extends Person> personClass = person.getClass();
/* How can i locate the class Butler<personClass> ?? */
// Key<Butler> butlerKey = Key.get(new TypeLiteral<Butler>(){});
// Butler butler = injector.getInstance(butlerKey);
// return butler;
return null;
}
}
Thanks in advance
Tim
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