Dependency Injection improvements

[DaanVanYperen]

Small extension to DI. Alternatively we could integrate Dagger 2?

• [ ] DI initialization time entity subscriptions

@all(chicken.class, enemy.class)
@exclude(exploding.class)
private EntitySubscription enemyChickens;

Edit: See @AspectDescriptor, it already allows injecting Archetype, Aspect, Aspect.Builder, EntitySubscription, EntityTransmuter instances.

• [ ] Lazy + Providers (runtime)

  class MapCollisionSystem .. {
  private Lazy<MapMask> solidMask;
  }
  ...
  if ( solidMask.has() ) collisionCheck(solidMask.get());

class MapSystem ... {
   @Provides(fieldName="solidMask")
   public MapMask getMask() {  ... }
   @Provides
   public MapMask getMask(String fieldName) {  ... }
}

• [ ] Tag Provider on TagManager

Lazily resolve tag in world.

private Lazy<Entity> player; mPos(player.get());
private Lazy<E> player; player.get().pos.x;

see #532 Query API .

[DaanVanYperen]

Oops. Forgot the Lazy part. Should double-take if this goes to far out of scope for odb.

[DaanVanYperen]

Singleton plugin solves this use-case. Closing. https://github.com/DaanVanYperen/artemis-odb-contrib/tree/develop/contrib-plugin-singleton