设计模式-策略模式

1.Strategy接口

public interface Strategy {
    String getVpcList(String id);
}

2.ResourceA实现

@Component("A")
public class ResourceA implements Strategy {
    @Override
    public String getVpcList(String id){
        System.out.println("A,getVCPlist"+id);
        return id;
    }
}

3.ResourceB实现

@Component("B")
public class ResourceB implements Strategy {
    @Override
    public String getVpcList(String id){
        System.out.println("B,getVCPlist"+id);
        return id;
    }
}

4.SimpleContext实现：
通过Spring将实现Strategy的实现类都自动注入到strategyMap类中，当用户传入选择的资源池时，自动根据资源池id去对应的资源池实现中查找资源。

@Service
public class SimpleContex {
    @Autowired
    private  final Map<String,Strategy> strategyMap =new ConcurrentHashMap<>();
    public SimpleContex(Map<String,Strategy> strategyMap){
        this.strategyMap.clear();
        strategyMap.forEach((k, v)-> this.strategyMap.put(k, v));
    }
    public String getResource(String poolid){
        return strategyMap.get(poolid).getVpcList(poolid);
    }
}

5.使用测试

  @Autowired
    private SimpleContex simpleContex;
    @Test
    public void  strategytest(){
        simpleContex.getResource("A") ; //执行A
        simpleContex.getResource("B") ; //执行B
    }

output：

image.png