com.ofcoder.klein.consensus.facade.nwr.Nwr Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.ofcoder.klein.consensus.facade.nwr;

import com.ofcoder.klein.spi.SPI;

/**
 * NWR: N ＞ W + R.
 * R is read quorum, W is write quorum.
 *
 * @author 释慧利
 */
@SPI
public interface Nwr {
    /**
     * calculate read quorum.
     *
     * @param n total size
     * @return read quorum
     */
    int r(int n);

    /**
     * calculate write quorum.
     *
     * @param n total size
     * @return write quorum
     */
    int w(int n);
}