2.6.5 迁移 2.7.9 不兼容

- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [ ] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 2.7.9
* Operating System version: mac
* Java version: 1.8

### Steps to reproduce this issue

1. 升级前的dubbo版本是2.6.5
2. 升级后的dubbo版本是2.7.9
3. 2.6.5有一段这样的代码，在新版本中不兼容，新版本中应该如何处理：
`Set providerInvokerWrapperSet = ProviderConsumerRegTable.getProviderInvoker(providerModel.getServiceName());
for (ProviderInvokerWrapper providerInvokerWrapper : providerInvokerWrapperSet) {
if (providerInvokerWrapper.isReg()) {
isReg = true;
break;
}
}`

`Set consumerInvokerWrapperSet = ProviderConsumerRegTable.getConsumerInvoker(consumerModel.getServiceName());

for (ConsumerInvokerWrapper consumerInvokerWrapper : consumerInvokerWrapperSet) {
Map urlInvokerMap = consumerInvokerWrapper.getRegistryDirectory().getUrlInvokerMap();`
Pls. provide [GitHub address] to reproduce this issue.

### Expected Result

What do you expected from the above steps？

### Actual Result

ProviderInvokerWrapper，ProviderConsumerRegTable,ConsumerInvokerWrapper,ProviderConsumerRegTable在新的版本中没有，导致编译错误

What actually happens?

期望有相同功能的写法

If there is an exception, please attach the exception trace:

```
Just put your stack trace here!
```