封装，包装的使用

1.通用对象PriceRequest

public class PriceRequest {
    protected String regionId;
    protected int count;
    protected String pinAlias;
    protected ApplyType applyType;

    public ApplyType getApplyType() {
        return applyType;
    }

    public void setApplyType(ApplyType applyType) {
        this.applyType = applyType;
    }

    public String getPinAlias() {
        return pinAlias;
    }

    public void setPinAlias(String pinAlias) {
        this.pinAlias = pinAlias;
    }

    public String getRegionId() {
        return regionId;
    }

    public void setRegionId(String regionId) {
        this.regionId = regionId;
    }

    public int getCount() {
        return count;
    }

    public void setCount(int count) {
        this.count = count;
    }
}

2.接口CalculateTotalPrice 加泛型，功能是获取不同产品的价格，产品有redis,pod

public interface CalculateTotalPrice<T extends PriceRequest> {

    Number calculate(T info);
}

3.依赖redis的对象

public class RedisPriceRequest extends PriceRequest {

    private String instanceType;

    public String getInstanceType() {
        return instanceType;
    }

    public void setInstanceType(String instanceType) {
        this.instanceType = instanceType;
    }

}

4.接口实现类

public class RedisCalculatePrice extends AbstractPrice implements CalculateTotalPrice<RedisPriceRequest> {

    private static final Logger logger = LoggerFactory.getLogger(RedisCalculatePrice.class);

    private static final String SERVICE_CODE = "redis";

    private final BillingClientHolder clientHolder;

    public RedisCalculatePrice() {
        this.clientHolder = BeanContext.getBean(BillingClientHolder.class);
    }

    @Override
    public Number calculate(RedisPriceRequest info) {
        FamaPin pin = getPin(info.getPinAlias());
        CalculateTotalPriceRequest request = buildParam(info);
        CalculateTotalPriceResponse response = null;
        try {
             response = clientHolder.getClientByPin(pin).calculateTotalPrice(request);
            if (null == response.getResult()) {
                logger.error("get price has error :{}", response.getError().getMessage());
                return 0;
            }
            return response.getResult().getDiscountedTotalPrice();
        } catch (Exception ex) {
            logger.warn("query billing from jcloud failed", ex);
            logger.warn("request is {}, respond is {}", JsonUtils.toJSONString(request), JsonUtils.toJSONString(response));
            return 0;
        }
    }
}

5.实现类的再次封装

public class PriceServiceControl<T extends PriceRequest> {

    private final CalculateTotalPrice<T> price;

    public PriceServiceControl(CalculateTotalPrice<T> price) {
        this.price = price;
    }

    public Number calculate(T couponInfo) {
        return price.calculate(couponInfo);
    }
}

6.最终代码调用

PriceServiceControl<RedisPriceRequest> redisControl = new PriceServiceControl<>(new RedisCalculatePrice());
price = redisControl.calculate(redisPriceRequest);