/* RegisterableService.java -- An interface for service providers.
   Copyright (C) 2004, 2005  Free Software Foundation, Inc.

This file is part of GNU Classpath.

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it under the terms of the GNU General Public License as published by
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02110-1301 USA.

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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
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package javax.imageio.spi;


/**
 * An interface which service providers may optionally implement in
 * order to get notified when they are added or removed from a {@link
 * ServiceRegistry}.
 *
 * @since 1.4
 *
 * @author Sascha Brawer (brawer@dandelis.ch)
 */
public interface RegisterableService
{
  /**
   * Informs this service provider that it has been registered in a
   * {@link ServiceRegistry}. If this provider gets registered as an
   * implementor for several service categories, its
   * <code>onRegistration</code> method will be called multiple times.
   *
   * @param registry the registry to which this service provider has
   * been added.
   *
   * @param category the service category for which this provider has
   * been registered as an implementor.
   */
  void onRegistration(ServiceRegistry registry, Class<?> category);


  /**
   * Informs this service provider that it has been de-registered from
   * a {@link ServiceRegistry}. If this provider had been registered
   * as an implementor for several service categories, its
   * <code>onDeregistration</code> method will be called multiple
   * times.
   *
   * @param registry the registry from which this service provider has
   * been removed.
   *
   * @param category the service category for which this provider has
   * been registered as an implementor.
   */
  void onDeregistration(ServiceRegistry registry, Class<?> category);
}