hazelcast-master/hazelcast/src/main/java/com/hazelcast/jet/impl/submitjob/clientside/SubmitJobTargetMemberFinder.java
/*
 * Copyright (c) 2008-2023, 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.jet.impl.submitjob.clientside;

import com.hazelcast.client.impl.clientside.HazelcastClientInstanceImpl;
import com.hazelcast.cluster.Member;
import com.hazelcast.jet.JetException;

import java.util.ArrayList;
import java.util.Collections;
import java.util.UUID;

/**
 * Used by client side to find a target cluster member
 */
public class SubmitJobTargetMemberFinder {

    /**
     * Pick a random cluster member
     */
    public UUID getRandomMemberId(HazelcastClientInstanceImpl client) {
        ArrayList<Member> memberList = new ArrayList<>(client.getClientClusterService().getMemberList());
        return getRandomIdFromList(memberList);
    }

    UUID getRandomIdFromList(ArrayList<Member> memberList) {
        if (memberList.isEmpty()) {
            throw new JetException("Cluster member list is empty");
        }
        Collections.shuffle(memberList);
        Member member = memberList.get(0);
        return member.getUuid();
    }
}
