RegisterableService (Java SE 12 & JDK 12 )

All Known Implementing Classes:

IIOServiceProvider, ImageInputStreamSpi, ImageOutputStreamSpi, ImageReaderSpi, ImageReaderWriterSpi, ImageTranscoderSpi, ImageWriterSpi
```
public interface RegisterableService
```
An optional interface that may be provided by service provider objects that will be registered with a ServiceRegistry. If this interface is present, notification of registration and deregistration will be performed.

See Also:

ServiceRegistry

Method Summary

Modifier and Type	Method	Description
`void`	`onDeregistration(ServiceRegistry registry, Class<?> category)`	Called when an object implementing this interface is removed from the given `category` of the given `registry`.
`void`	`onRegistration(ServiceRegistry registry, Class<?> category)`	Called when an object implementing this interface is added to the given `category` of the given `registry`.

- Method Detail
  - onRegistration
```
void onRegistration(ServiceRegistry registry,
                    Class<?> category)
```
    Called when an object implementing this interface is added to the given category of the given registry. The object may already be registered under another category or categories.
    
    Parameters:
    
    registry - a ServiceRegistry where this object has been registered.
    
    category - a Class object indicating the registry category under which this object has been registered.
  - onDeregistration
```
void onDeregistration(ServiceRegistry registry,
                      Class<?> category)
```
    Called when an object implementing this interface is removed from the given category of the given registry. The object may still be registered under another category or categories.
    
    Parameters:
    
    registry - a ServiceRegistry from which this object is being (wholly or partially) deregistered.
    
    category - a Class object indicating the registry category from which this object is being deregistered.