Broken link in FAQ #1045

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1. rcchan commented on Oct 23, 2016

   

   rcchan

   on Oct 23, 2016

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   It looks like the link is working again (content for reference):

   import com.google.inject.*;
   import com.google.inject.privatemodules.PrivateModule;
   
   import static java.lang.annotation.ElementType.*;
   import java.lang.annotation.Retention;
   import java.lang.annotation.RetentionPolicy;
   import java.lang.annotation.Target;
   import java.util.Date;
   
   public class RobotLegsProblem2 {
   
   
       public static void main(String[] args) {
           Injector injector = Guice.createInjector(new AbstractModule() {
               @Override
               protected void configure() {
                   // global stuff
                   // same to all
                   bind(Driveline.class).to(FrontWheelDrive.class);
                   bind(Engine.class).to(DieselEngine.class);
               }
           }, new PrivateModule() {
               @Override
               protected void configurePrivateBindings() {
                   // private Module is different story
                   // Bind car annotated with blue and expose it
                   bind(Car.class).annotatedWith(Blue.class).to(Car.class);
                   expose(Car.class).annotatedWith(Blue.class);
   
                   // What we bind in here only applies to the exposed stuff
                   // i.e. the exposed car from this module will get this injected
                   // where stuff in regular module (Engine,Driveline) is "inherited" - it is global
                   bind(Transmission.class).to(AutomaticTransmission.class);
               }
           }, new PrivateModule() {
               @Override
               protected void configurePrivateBindings() {
                   bind(Car.class).annotatedWith(Red.class).to(Car.class);
                   expose(Car.class).annotatedWith(Red.class);
   
                   bind(Transmission.class).to(ManualTransmission.class);
                  /*
                    The point is that you cannot do this with regular module i.e.
                    bind(Car.class).annotatedWith(Blue.class).to(Car.class);
                    bind(Car.class).annotatedWith(Red.class).to(Car.class);
                    now notice the dilemma
                    class Car{
                    @Inject Transmission transmission;
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                    You cannot solve this by
                    @Inject @Blue @Red Transmission transmission;
                    or
                    bind(Transmission.class).to(AutomaticTransmission.class).ifParentAnnotatedWith(Blue.class)
                    bind(Transmission.class).to(ManualTransmission.class).ifParentAnnotatedWith(Red.class)
                    but with private modules you can get this functionality
                    */
               }
           });
   
           Car blueCar = injector.getInstance(Key.get(Car.class, Blue.class));
           System.out.println("Blue car transmission: " + blueCar.getTransmission());
   
           Car redCar = injector.getInstance(Key.get(Car.class, Red.class));
           System.out.println("Red car transmission: " + redCar.getTransmission());
   
       }
   
   
   }
   
   @Retention(RetentionPolicy.RUNTIME)
   @Target({FIELD, PARAMETER, METHOD})
   @BindingAnnotation
           @interface Blue {
   }
   
   @Retention(RetentionPolicy.RUNTIME)
   @Target({FIELD, PARAMETER, METHOD})
   @BindingAnnotation
           @interface Red {
   }
   
   class Car {
   
       private final Engine engine;
       private final Transmission transmission;
       private final Driveline driveline;
   
       @Inject
       public Car(Engine engine, Transmission transmission, Driveline driveline) {
           this.engine = engine;
           this.transmission = transmission;
           this.driveline = driveline;;
       }
   
       public Driveline getDriveline() {
           return driveline;
       }
   
       public Engine getEngine() {
           return engine;
       }
   
       public Transmission getTransmission() {
           return transmission;
       }
   }
   
   
   interface Transmission {
   }
   
   class AutomaticTransmission implements Transmission {
   }
   
   class ManualTransmission implements Transmission {
   }
   
   interface Engine {
   }
   
   class DieselEngine implements Engine {
   }
   
   class PetrolEngine implements Engine {
   }
   
   interface Driveline {
   }
   
   class FourWheelDrive implements Driveline {
   }
   
   class FrontWheelDrive implements Driveline {
   }
   
   class RearWheelDrive implements Driveline {
   }
   

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2. EdgeCaseBerg commented on Oct 2, 2018

   

   EdgeCaseBerg

   on Oct 2, 2018

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   The link is broken again.
3. dimo414 commented on Oct 3, 2018

   

   dimo414

   on Oct 3, 2018

   Contributor

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   Looks like the pastie server is down. It might come back, but it seems better to update the link to point to this bug; thanks @rcchan for pulling in the content.
4. dimo414

   closed this as completedon Oct 3, 2018
5. abliss commented on Jul 25, 2019

   

   abliss

   on Jul 25, 2019

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   Hi, does this code sample still work in the latest version of Guice? it seems that perhaps PrivateModule changed packages and configurePrivateBindings became configure?

   👍React with 👍2Reacted by Philip Shao and sparklingyo