RegisterableService.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 *
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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
 *
 */
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);
}