Strategy pattern with spring beans

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灰色年华 2020-12-04 10:00

Say I\'m using spring, I have the following strategies...

Interface

public interface MealStrategy {
    cook(Meat meat);
}

First st

2条回答

情话喂你 (楼主)

2020-12-04 10:36

I would use simple Dependency Injection.

@Component("burger")
public class BurgerStrategy implements MealStrategy { ... }

@Component("sausage")
public class SausageStrategy implements MealStrategy { ... }

Controller

Option A:

@Resource(name = "burger")
MealStrategy burger;

@Resource(name = "sausage")
MealStrategy sausage;

@RequestMapping(method = RequestMethod.POST)
public @ResponseBody Something makeMeal(Meat meat) {
    burger.cookMeal(meat);
}

Option B:

@Autowired
BeanFactory bf;

@RequestMapping(method = RequestMethod.POST)
public @ResponseBody Something makeMeal(Meat meat) {
    bf.getBean("burger", MealStrategy.class).cookMeal(meat);
}

You can choose to create JSR-330 qualifiers instead of textual names to catch misspellings during compile time.