服务提供者框架适用于”服务有多个实现”的解耦, 比如商城平台接口有淘宝, 天猫, 京东等多实现.

    这里拿商城接口做示例, 结构如下图

    • MallServiceProvider中进行服务注册
    • MallService作为顶层服务接口, 当然还可以进一步根据业务功能细分, 比如OrderService ,ProductService(extends MallService) 等等
    • AbstractMallServic作为接口的抽象实现, 定义算法骨架, 提取具体实现中通用的操作, 比如通用校验等image.png

    MallServiceProvider

    1. @Component
    2. public class MallServiceProvider {
    3.     private static final Map<MallType, MallService> MALL_SERVICE_MAP = new ConcurrentHashMap<>();
    5.     public MallServiceProvider(List<MallService> mallServices) {
    6.         for (MallService mallService : mallServices) {
    7.             for (MallType mallType : mallService.supports()) {
    8.                 MALL_SERVICE_MAP.put(mallType, mallService);
    9.             }
    10.         }
    11.     }
    13.     public MallService getMallService(MallType mallType) {
    14.         return MALL_SERVICE_MAP.getOrDefault(mallType, MALL_SERVICE_MAP.get(MallType.DEFAULT));
    15.     }
    16. }

    MallService

    1. /**
    2.  * @author xinzhang
    3.  * @date 2021/1/29 14:09
    4.  */
    5. public interface MallService {
    6.     /**
    7.      * 示例方法
    8.      */
    9.     void demoFunction();
    11.     /**
    12.      * 支持哪些平台
    13.      *
    14.      * @return
    15.      */
    16.     MallType[] supports();
    17. }

    AbstractMallService

    1. /**
    2.  * @author xinzhang
    3.  * @date 2021/1/29 14:11
    4.  */
    5. public abstract class AbstractMallService implements MallService {
    6.     @Override
    7.     public void demoFunction() {
    8.         System.out.println("一些通用校验以及处理, 巴拉巴拉");
    9.         doDemoFunction();
    10.     }
    12.     /**
    13.      * 具体实现
    14.      */
    15.     protected abstract void doDemoFunction();
    16. }

    DefaultMallService

    1. @Component
    2. public class DefaultMallService extends AbstractMallService {
    3.     @Override
    4.     protected void doDemoFunction() {
    6.     }
    8.     @Override
    9.     public MallType[] supports() {
    10.         return new MallType[]{
    11.                 MallType.DEFAULT
    12.         };
    13.     }
    14. }

    JdMallService

    1. @Component
    2. public class JdMallService extends AbstractMallService {
    3.     @Override
    4.     protected void doDemoFunction() {
    5.         System.out.println("这里是京东商城服务");
    6.     }
    8.     @Override
    9.     public MallType[] supports() {
    10.         return new MallType[]{
    11.                 MallType.JD
    12.         };
    13.     }
    14. }

    TaoBaoMallService

    1. @Component
    2. public class TaoBaoMallService extends AbstractMallService {
    3.     @Override
    4.     protected void doDemoFunction() {
    5.         System.out.println("这里是淘宝, 天猫平台服务");
    6.     }
    8.     @Override
    9.     public MallType[] supports() {
    10.         return new MallType[]{
    11.                 MallType.TAOBAO, MallType.TMALL
    12.         };
    13.     }
    14. }

    MallType枚举

    1. public enum MallType {
    2.     DEFAULT("默认空实现", 0),
    3.     TAOBAO("淘宝", 1),
    4.     TMALL("天猫", 2),
    5.     JD("京东", 3);
    6.     private final String caption;
    7.     private final int value;
    9.     MallType(String caption, int value) {
    10.         this.caption = caption;
    11.         this.value = value;
    12.     }
    14.     public int value() {
    15.         return this.value;
    16.     }
    17. }

    测试

    1. @RunWith(SpringRunner.class)
    2. @SpringBootTest
    3. public class DemoApplicationTests {
    4.     @Autowired
    5.     private MallServiceProvider mallServiceProvider;
    7.     @Test
    8.     public void testConfiguration() {
    9.         MallService mallService = mallServiceProvider.getMallService(MallType.TAOBAO);
    10.         mallService.demoFunction();
    11.     }
    12. }
    13. --------------输出
    14. 一些通用校验以及处理, 巴拉巴拉
    15. 这里是淘宝, 天猫平台服务