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/**
 * Copyright 2018 Nikita Koksharov
 *
 * 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.redisson.api;

import java.util.Comparator;
import java.util.List;
import java.util.Queue;

/**
 * 
 * @author Nikita Koksharov
 *
 * @param  value type
 */
public interface RPriorityQueue extends Queue, RObject {

    Comparator comparator();
    
    List readAll();
    
    V pollLastAndOfferFirstTo(String dequeName);
    
    /**
     * Sets new comparator only if current set is empty
     *
     * @param comparator for values
     * @return true if new comparator setted
     *         false otherwise
     */
    boolean trySetComparator(Comparator comparator);

}