001/* RegisterableService.java -- An interface for service providers.
002   Copyright (C) 2004, 2005  Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
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013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
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017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
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033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package javax.imageio.spi;
040
041
042/**
043 * An interface which service providers may optionally implement in
044 * order to get notified when they are added or removed from a {@link
045 * ServiceRegistry}.
046 *
047 * @since 1.4
048 *
049 * @author Sascha Brawer (brawer@dandelis.ch)
050 */
051public interface RegisterableService
052{
053  /**
054   * Informs this service provider that it has been registered in a
055   * {@link ServiceRegistry}. If this provider gets registered as an
056   * implementor for several service categories, its
057   * <code>onRegistration</code> method will be called multiple times.
058   *
059   * @param registry the registry to which this service provider has
060   * been added.
061   *
062   * @param category the service category for which this provider has
063   * been registered as an implementor.
064   */
065  void onRegistration(ServiceRegistry registry, Class<?> category);
066
067
068  /**
069   * Informs this service provider that it has been de-registered from
070   * a {@link ServiceRegistry}. If this provider had been registered
071   * as an implementor for several service categories, its
072   * <code>onDeregistration</code> method will be called multiple
073   * times.
074   *
075   * @param registry the registry from which this service provider has
076   * been removed.
077   *
078   * @param category the service category for which this provider has
079   * been registered as an implementor.
080   */
081  void onDeregistration(ServiceRegistry registry, Class<?> category);
082}