# Interface RegisterableService

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 Details

  - ### 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.