RegistryProtocolListener (Apache Dubbo 2.7.16 API)

所有已知实现类:

MigrationRuleListener
```
@SPI
public interface RegistryProtocolListener
```
RegistryProtocol listener is introduced to provide a chance to user to customize or change export and refer behavior of RegistryProtocol. For example: re-export or re-refer on the fly when certain condition meets.

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`void`	`onDestroy()`	Notify RegistryProtocol's listeners when the protocol is destroyed
`void`	`onExport(RegistryProtocol registryProtocol, org.apache.dubbo.rpc.Exporter<?> exporter)`	Notify RegistryProtocol's listeners when a service is registered
`void`	`onRefer(RegistryProtocol registryProtocol, ClusterInvoker<?> invoker, URL url)`	Notify RegistryProtocol's listeners when a service is subscribed

- 方法详细资料
  - onExport
```
void onExport(RegistryProtocol registryProtocol,
              org.apache.dubbo.rpc.Exporter<?> exporter)
```
    Notify RegistryProtocol's listeners when a service is registered
    
    参数:
    
    registryProtocol - RegistryProtocol instance
    
    exporter - exporter
    
    另请参阅:
    
    RegistryProtocol.export(org.apache.dubbo.rpc.Invoker)
  - onRefer
```
void onRefer(RegistryProtocol registryProtocol,
             ClusterInvoker<?> invoker,
             URL url)
```
    Notify RegistryProtocol's listeners when a service is subscribed
    
    参数:
    
    registryProtocol - RegistryProtocol instance
    
    invoker - invoker
    
    url -
    
    另请参阅:
    
    RegistryProtocol.refer(Class, URL)
  - onDestroy
```
void onDestroy()
```
    Notify RegistryProtocol's listeners when the protocol is destroyed