com.netflix.nfsidecar.utils.FifoQueue Maven / Gradle / Ivy

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/**
 * Copyright 2013 Netflix, Inc.
 *
 * 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 com.netflix.nfsidecar.utils;

import java.util.Comparator;
import java.util.TreeSet;

public class FifoQueue> extends TreeSet
{
    private static final long serialVersionUID = -7388604551920505669L;
    private int capacity;

    public FifoQueue(int capacity)
    {
        super(new Comparator()
        {
            @Override
            public int compare(E o1, E o2)
            {
                return o1.compareTo(o2);
            }
        });
        this.capacity = capacity;
    }

    public FifoQueue(int capacity, Comparator comparator)
    {
        super(comparator);
        this.capacity = capacity;
    }

    public synchronized void adjustAndAdd(E e)
    {
        add(e);
        if (capacity < size())
            pollFirst();
    }
}