cassandra-analytics-core/src/test/java/org/apache/cassandra/spark/bulkwriter/CassandraTopologyMonitorTest.java

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *
 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.cassandra.spark.bulkwriter;

import java.util.concurrent.atomic.AtomicBoolean;

import com.google.common.collect.ImmutableMap;
import org.junit.jupiter.api.Test;

import org.apache.cassandra.spark.bulkwriter.token.TokenRangeMapping;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

class CassandraTopologyMonitorTest
{
    @Test
    void testNoTopologyChange()
    {
        ClusterInfo mockClusterInfo = mock(ClusterInfo.class);
        when(mockClusterInfo.getTokenRangeMapping(false)).thenReturn(buildTopology(10));
        AtomicBoolean noChange = new AtomicBoolean(true);
        CassandraTopologyMonitor monitor = new CassandraTopologyMonitor(mockClusterInfo, event -> noChange.set(false));
        monitor.checkTopologyOnDemand();
        assertTrue(noChange.get());
    }

    @Test
    void testTopologyChanged()
    {
        ClusterInfo mockClusterInfo = mock(ClusterInfo.class);
        when(mockClusterInfo.getTokenRangeMapping(false))
        .thenReturn(buildTopology(10))
        .thenReturn(buildTopology(11)); // token moved
        AtomicBoolean noChange = new AtomicBoolean(true);
        CassandraTopologyMonitor monitor = new CassandraTopologyMonitor(mockClusterInfo, event -> noChange.set(false));
        monitor.checkTopologyOnDemand();
        assertFalse(noChange.get());
    }

    private TokenRangeMapping<RingInstance> buildTopology(int instancesCount)
    {
        return TokenRangeMappingUtils.buildTokenRangeMapping(0, ImmutableMap.of("DC1", 3), instancesCount);
    }
}