gistfile1.java

public interface AlgorithmService {

    boolean isApplicableFor(final MrpAlgorithm algorothm);
    
    Map<Entity, BigDecimal> perform(final Map<Entity, BigDecimal> productComponentQuantities, final Set<Entity> nonComponents,
                       final MrpAlgorithm algorithm, final String type);
}

---------------------------------------------

@Service
public class ConcreteAlgorithmService implements AlgorithmService {

    @Override
    public boolean isApplicableFor(final MrpAlgorithm algorothm) {
        return MrpAlgorithm.COSTAM.equals(algorithm);
    }

    @Override
    public Map<Entity, BigDecimal> perform(Map<Entity, BigDecimal> productComponentQuantities, Set<Entity> nonComponents) {
        // specific ProductQuantitiesServiceImpl.getProducts overriding implemnetation here
        return ..;
    }

}

-------------------------------------------

@Aspect
public abstract class AbstractAlgorithmResolverAspect {

    protected abstract AlgorithmService getAlgorithmService();

    @Pointcut("execution(private Map<Entity, BigDecimal> com.qcadoo.mes.technologies.ProductQuantitiesServiceImpl.getProducts(..)) "
                       + "&& args(productComponentQuantities,nonComponents, algorithm, type)")
               public void getProductsMethodExecution(final Map<Entity, BigDecimal> productComponentQuantities,
                       final Set<Entity> nonComponents, final MrpAlgorithm algorithm, final String type) {
               }
    
    @Around("getProductsMethodExecution(productComponentQuantities,nonComponents, algorithm, type)")
    public Map<Entity, BigDecimal> aroundGetProductsMethodExecution(final ProceedingJoinPoint pjp, final Map<Entity, BigDecimal> productComponentQuantities, final Set<Entity> nonComponents, final MrpAlgorithm algorithm, final String type) throws Throwable {
             if (getAlgorithmService().isApplicableFor(algorithm)) {
                 getAlgorithmService().perform(productComponentQuantities, nonComponents ...);
             } else {
                 pjp.proceed();
             }
    }
}

-----------------------------------------------

@Aspect
@RunIfEnabled("techSubcontractors")
public final class ConcreteAlgorithmResolverAspect extends AbstractAlgorithmResolverAspect {

    @Autowired
    private AlgorithmService concreAlgorithmService;
    
    protected AlgorithmService getAlgorithmService() {
        return concreAlgorithmService;
    }
}