利用策略模式+模板方法实现项目中运维功能-易微帮

前段时间项目中有个需求：实现某业务的运维功能，主要是对10张数据库表的增删改查，没有复杂的业务逻辑，只是满足运维人员的基本需要，方便他们快速分析定位问题。这里简单记录分享下实现方案，仅供参考。

一、项目方案

根据不同的表定义各自的Vo，然后继承公共的BaseDataVo。设计接口IDataProcessor和抽象处理类AbstractDataProcessor，这个AbstractDataProcessor定义增删改查模板方法。根据不同策略执行不同的processor，比如NodeProcessorService、NodeAutoProcessorService等。
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二、代码实现

这里只实现了查询方法，其他增加、删除、修改可以依次实现！

1、定义Vo

BaseDataVo

@Getter
@Setter
public class BaseDataVo implements Serializable {
    private Integer id;
    private String creator;
    private String last_update_by;
    private Date create_time;
    private Date last_update_time;
}

NodeVo

@Getter
@Setter
public class NodeVo extends BaseDataVo{
    String esn;
    String name;
}

2、设计表名及对应服务枚举类TableNameServiceEnum

@Getter
@AllArgsConstructor
public enum TableNameServiceEnum {

    NODE("nodeVo", "nodeProcessorService"),
    NODE_AUTO("nodeAutoVo", "nodeAutoProcessorService");
    private String tableName;
    private String serviceName;
    public static Map<String, String> map = new HashMap<>();

    static {
        Arrays.stream(values()).forEach(v->map.put(v.getTableName(),v.getServiceName()));
    }

    public static String getServiceName(String tableName){
        return map.get(tableName);
    }
}

3、IDataProcessor用于定义AbstractDataProcessor所需的接口

public interface IDataProcessor {
    // 这里只实现了查询方法，其他增加、删除、修改可以依次实现
    List<? extends BaseDataVo> findList(SearchVo searchVo, String tableName);
}

IDataOperationService定义增删改查模板方法

public interface IDataOperationServices {
    List<? extends BaseDataVo> findList(SearchVo searchVo, String tableName);
}

4、抽象处理类及各自业务实现

AbstractDataProcessor

public abstract class AbstractDataProcessor implements IDataProcessor {

    @Override
    public List<? extends BaseDataVo> findList(SearchVo searchVo, String tableName) {
        return findPagedList(searchVo,tableName);
    }

    // 这里定义模板方法，执行具体的processor
    protected abstract List<? extends BaseDataVo> findPagedList(SearchVo searchVo, String tableName);
}

DataOperationService业务处理service层

@Service
public class DataOperationService implements IDataOperationServices {

    @Autowired
    private Map<String, IDataProcessor> dataProcessMap;

    // 这里根据tableName获取执行不同的processor
    @Override
    public List<? extends BaseDataVo> findList(SearchVo searchVo, String tableName) {
        return Optional.ofNullable(tableName)
                .filter(name -> !name.isEmpty())
                .map(this::getDataProcessor)
                .map(processor -> processor.findList(searchVo, tableName))
                .orElse(null);
    }

    // 这里根据tableName获取获取不同的processor
    private IDataProcessor getDataProcessor(String tableName) {
        String serviceName = TableNameServiceEnum.getServiceName(tableName);
        return dataProcessMap.get(serviceName);
    }
}

node_auto业务处理类

@Service
public class NodeAutoProcessorService extends AbstractDataProcessor{
    @Autowired
    private NodeAutoMapper nodeAutoMapper;
    @Override
    protected List<? extends BaseDataVo> findPagedList(SearchVo searchVo, String tableName) {
        QueryWrapper<NodeAutoVo> nodeAutoVoQueryWrapper = new QueryWrapper<>();
        nodeAutoVoQueryWrapper.eq("esn",searchVo.getEsn());
        nodeAutoVoQueryWrapper.eq("name",searchVo.getName());
        return nodeAutoMapper.selectList(nodeAutoVoQueryWrapper);
    }
}

node业务处理类

@Service
public class NodeProcessorService extends AbstractDataProcessor{
    @Autowired
    private NodeMapper nodeMapper;
    @Override
    protected List<? extends BaseDataVo> findPagedList(SearchVo searchVo, String tableName) {
        QueryWrapper<NodeVo> nodeVoQueryWrapper = new QueryWrapper<>();
        nodeVoQueryWrapper.eq("esn",searchVo.getEsn());
        nodeVoQueryWrapper.eq("name",searchVo.getName());
        return nodeMapper.selectList(nodeVoQueryWrapper);
    }
}

5、各自对应Mapper

这里是设置在多数源场景下，使用mysql1配置
NodeMapper

@DS("mysql1")
@Repository("NodeMapper")
public interface NodeMapper extends BaseMapper<NodeVo> {

}

NodeAutoMapper

@DS("mysql1")
@Repository("NodeAutoMapper")
public interface NodeAutoMapper extends BaseMapper<NodeAutoVo> {

}

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6、DataOperationController控制层

@RestController
public class DataOperationController {

    @Autowired
    private DataOperationService dataOperationService;

    @RequestMapping("findList")
    public List<? extends BaseDataVo> findList(@RequestBody SearchVo searchVo, @RequestParam String tableName) {
        return dataOperationService.findList(searchVo, tableName);
    }
}