/*
 * @(#)RegisterableService.java	1.9 04/05/05
 *
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.imageio.spi;

/**
 * An optional interface that may be provided by service provider
 * objects that will be registered with a
 * <code>ServiceRegistry</code>.  If this interface is present,
 * notification of registration and deregistration will be performed.
 *
 * @see ServiceRegistry
 *
 * @version 0.5
 */
public interface RegisterableService {

    /**
     * Called when an object implementing this interface is added to
     * the given <code>category</code> of the given
     * <code>registry</code>.  The object may already be registered
     * under another category or categories.
     *
     * @param registry a <code>ServiceRegistry</code> where this
     * object has been registered.
     * @param category a <code>Class</code> object indicating the
     * registry category under which this object has been registered.
     */
    void onRegistration(ServiceRegistry registry, Class<?> category);

    /**
     * Called when an object implementing this interface is removed
     * from the given <code>category</code> of the given
     * <code>registry</code>.  The object may still be registered
     * under another category or categories.
     *
     * @param registry a <code>ServiceRegistry</code> from which this
     * object is being (wholly or partially) deregistered.
     * @param category a <code>Class</code> object indicating the
     * registry category from which this object is being deregistered.
     */
    void onDeregistration(ServiceRegistry registry, Class<?> category);
}