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Yar API: provide the main interfaces to manipulate the registry

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/*
 * Copyright 2013 Romain Gilles
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package org.javabits.yar;

import javax.annotation.Nullable;

/**
 * TODO
 * Date: 2/19/13
 * Time: 9:27 AM
 *
 * @author Romain Gilles
 */
public interface Watcher {

    @Nullable
    Supplier add(Supplier element);

    void remove(Supplier element);
}