desien-mode/src/main/java/strategyPattern/factory/OrderStrategyFactory.java

package strategyPattern.factory;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import strategyPattern.enums.OrderType;
import strategyPattern.service.OrderStrategy;
import strategyPattern.service.impl.GroupBuyOrderStrategy;
import strategyPattern.service.impl.NormalOrderStrategy;
import strategyPattern.service.impl.SeckillOrderStrategy;

import java.util.EnumMap;
import java.util.HashMap;
import java.util.Map;

public class OrderStrategyFactory {
    private static final Logger log = LoggerFactory.getLogger(OrderStrategyFactory.class);
    public static Map<String, OrderStrategy> STRATEGY_MAP = new HashMap<>();
    static {
        STRATEGY_MAP.put(OrderType.GROUPBY.getType(), new GroupBuyOrderStrategy());
        STRATEGY_MAP.put(OrderType.NORMAL.getType(), new NormalOrderStrategy());
        STRATEGY_MAP.put(OrderType.SECKILL.getType(), new SeckillOrderStrategy());
    }
    public static OrderStrategy getStrategy(String type) throws Exception {
        log.info("STRATEGY_MAP: " + STRATEGY_MAP);
        OrderStrategy o = STRATEGY_MAP.getOrDefault(type, null);
        if (o == null) {
            throw new Exception("没有对应的下单策略");
        }
        return o;
    }
}