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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.quorum;

import com.ofcoder.klein.rpc.facade.Endpoint;

/**
 * Quorum check.
 *
 * @author 释慧利
 */
public interface Quorum {
    /**
     * the node refuse, refuse current request.
     *
     * @param node refuse node
     * @return refuse result
     */
    boolean refuse(Endpoint node);

    /**
     * the node pass, grant current request.
     *
     * @param node pass node
     * @return grant result
     */
    boolean grant(Endpoint node);

    GrantResult isGranted();

    enum GrantResult {
        PASS,
        REFUSE,
        GRANTING
    }

}