像這樣的東西？

public class GuiceDependencyExample {

static class DBManager {}

static class DBManagerVendor1 extends DBManager {}

static class DBManagerVendor2 extends DBManager {}

static interface Consumer {

DBManager getDbManager();

}

static @Retention(RetentionPolicy.RUNTIME) @BindingAnnotation @interface DBManager1 {}

static @Retention(RetentionPolicy.RUNTIME) @BindingAnnotation @interface DBManager2 {}

static class ConsumerImpl implements Consumer {

DBManager m_dbm;

@Inject

public ConsumerImpl (DBManager dbm) { m_dbm = dbm; }

public DBManager getDbManager() { return m_dbm; }

}

static abstract class ConsumerModule extends PrivateModule {

private final Class extends Annotation> annotation;

ConsumerModule(Class extends Annotation> annotation) {

this.annotation = annotation;

}

@Override

protected void configure() {

bind(Consumer.class).annotatedWith(annotation).to(ConsumerImpl.class);

expose(Consumer.class).annotatedWith(annotation);

bindDbManager();

}

abstract void bindDbManager();

}

static class Client {

@DBManager1

@Inject

Consumer consumer1;

@DBManager2

@Inject

Consumer consumer2;

}

@Test

public void test() {

Injector i = Guice.createInjector(

new ConsumerModule(DBManager1.class) {

@Override void bindDbManager() {

bind(DBManager.class).toInstance(new DBManagerVendor1());

}

},

new ConsumerModule(DBManager2.class) {

@Override void bindDbManager() {

bind(DBManager.class).toInstance(new DBManagerVendor2());

}

});

Client client = i.getInstance(Client.class);

assertTrue(client.consumer1.getDbManager() instanceof DBManagerVendor1);

assertTrue(client.consumer2.getDbManager() instanceof DBManagerVendor2);

}

總結(jié)

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