Provider methods can have parameters and those parameters are injected.
@Provides
@Named("HandlerGroup1") Handler[] getHandlerGroup1(Provider<Handler>
handlerProvider) {
Handler[] handlers = new Handler[10];
for (int i = 0; i < handlers.length; i++) {
handlers[i] = handlerProvider.get();
}
return handlers;
}
On Wednesday, 12 February 2014 10:46:31 UTC-5, Denys Zakhozhyy wrote:
>
> While that does work, i found that my problem is on the next level.
>
> So to re-iterate, the problem is below:
>
> package guicetest;
>
> import com.google.inject.*;
> import com.google.inject.name.Named;
> import com.google.inject.name.Names;
>
> import java.util.Arrays;
> import java.util.concurrent.atomic.AtomicInteger;
>
> /**
> * {@code GuiceTest}
> */
> public class GuiceTest {
>
> public static void main(String[] args) {
>
>
> final Injector injector = Guice.createInjector(new
> AbstractModule() {
> @Override
> protected void configure() {
>
> bind(Integer.class).annotatedWith(Names.named("handlerParam")).toInstance(10);
> bind(Coordinator.class);
> bind(Handler.class).to(HandlerImpl.class);
> }
>
>
> @Provides
> Handler[] handlers() {
> final Handler[] handlers = new Handler[10];
>
> for (int i = 0; i < handlers.length; i++) {
>
> // how should I instantiate handlers here?
> handlers[i] = getProvider(Handler.class).get(); //
> this throws NPE because it this stage binder is set to null
> }
>
> return handlers;
> }
>
> });
>
>
> final Coordinator instance =
> injector.getInstance(Coordinator.class);
>
> System.out.println(instance);
> }
>
> }
>
>
> interface Handler {
>
> }
>
> class HandlerImpl implements Handler {
>
> static AtomicInteger instanceCounter = new AtomicInteger();
>
> private int handlerParam;
>
> @Inject
> HandlerImpl(@Named("handlerParam") int handlerParam) {
> this.handlerParam = handlerParam;
> instanceCounter.incrementAndGet();
> }
>
> @Override
> public String toString() {
> return "HandlerImpl{" + "handlerParam=" + handlerParam + '}';
> }
> }
>
>
> class Coordinator {
>
> private Handler[] handlers;
>
> @Inject
> Coordinator(Handler[] handlers) {
> this.handlers = handlers;
> }
>
> @Override
> public String toString() {
> return "Coordinator{" + "handlers=" + Arrays.toString(handlers) +
> '}';
> }
> }
>
>
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