LimitingPriorityDeque.java

/*
 * Copyright (C) 2014 The Calrissian Authors
 *
 * 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.calrissian.flowmix.core.support.deque;

import java.util.Comparator;

public class LimitingPriorityDeque<E> extends PriorityBlockingDeque<E> {

  private long maxSize;

  protected long getMaxSize() {
    return maxSize;
  }

  public LimitingPriorityDeque(long maxSize, Comparator<E> comparator) {
    super(comparator);
    this.maxSize = maxSize;
  }

  @Override
  public boolean offerFirst(E e) {
    if(size() == maxSize)
      removeLast();

    return super.offerFirst(e);
  }

  @Override
  public boolean offerLast(E e) {
    if(size() == maxSize)
      removeFirst();

    return super.offerLast(e);
  }

}