com.hazelcast.quorum.QuorumFunction Maven / Gradle / Ivy

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/*
 * Copyright (c) 2008-2016, Hazelcast, Inc. All Rights Reserved.
 *
 * 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.hazelcast.quorum;

import com.hazelcast.core.Member;
import java.util.Collection;

/**
 * A function that can be used for conclude absence/presence of quorum.
 * This function is triggered when any change happens to member list.
 */
public interface QuorumFunction {

    /**
     * Determines if quorum is present based on the member-list.
     *
     * @param members snapshot of current member list
     * @return boolean presence/absence of quorum
     */
    boolean apply(Collection members);
}