@Autowired踩坑记录

被spring管理的类不能被new出来，否则@Autowired注入为null

@Component
public class OrderContext {

    public static Map<String, OrderStrategy> orderStrategyMap;

    @Autowired
    private void setOrderStrategyMap(List<OrderStrategy> orderStrategies) {
        // 注入各种类型的订单处理类
        orderStrategyMap = orderStrategies.stream().collect(
                Collectors.toMap(orderStrategy -> AnnotationUtils.findAnnotation(orderStrategy.getClass(), OrderSource.class).source(),
                        v -> v, (v1, v2) -> v1));
    }

    // 获取具体策略类
    public static OrderStrategy getStrategy(String orderSource) {
        if (null == orderStrategyMap) {
            return null;
        }
        return orderStrategyMap.get(orderSource);
    }
}