hazelcast-master/hazelcast/src/test/java/com/hazelcast/client/loadBalancer/ClientRoundRobinLBTest.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.client.loadBalancer;

import com.hazelcast.client.config.ClientConfig;
import com.hazelcast.client.util.RoundRobinLB;
import com.hazelcast.cluster.Cluster;
import com.hazelcast.config.Config;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.cluster.Member;
import com.hazelcast.test.HazelcastParallelClassRunner;
import com.hazelcast.test.TestHazelcastInstanceFactory;
import com.hazelcast.test.annotation.ParallelJVMTest;
import com.hazelcast.test.annotation.QuickTest;
import org.junit.After;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;

@RunWith(HazelcastParallelClassRunner.class)
@Category({QuickTest.class, ParallelJVMTest.class})
public class ClientRoundRobinLBTest {

    private final TestHazelcastInstanceFactory factory = new TestHazelcastInstanceFactory();

    @After
    public void after() {
        factory.terminateAll();
    }

    @Test
    public void testRoundRobinLB_withoutMembers() {
        RoundRobinLB lb = new RoundRobinLB();

        assertNull(lb.next());
        assertNull(lb.nextDataMember());
    }

    @Test
    public void testRoundRobinLB_withMembers() {
        RoundRobinLB roundRobinLB = new RoundRobinLB();
        HazelcastInstance server = factory.newHazelcastInstance();

        Cluster cluster = server.getCluster();

        ClientConfig clientConfig = new ClientConfig();
        clientConfig.setLoadBalancer(roundRobinLB);

        roundRobinLB.init(cluster, clientConfig);

        Member member = cluster.getLocalMember();

        assertEquals(member, roundRobinLB.next());
        assertEquals(member, roundRobinLB.nextDataMember());
    }

    @Test
    public void testRoundRobinLB_withLiteMembers() {
        RoundRobinLB roundRobinLB = new RoundRobinLB();
        HazelcastInstance server = factory.newHazelcastInstance(new Config().setLiteMember(true));

        Cluster cluster = server.getCluster();

        ClientConfig clientConfig = new ClientConfig();
        clientConfig.setLoadBalancer(roundRobinLB);

        roundRobinLB.init(cluster, clientConfig);

        Member member = cluster.getLocalMember();

        assertEquals(member, roundRobinLB.next());
        assertNull(roundRobinLB.nextDataMember());
    }
}
