cassandra-trunk/test/distributed/org/apache/cassandra/distributed/test/NetworkTopologyTest.java
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 * 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
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 * 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
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package org.apache.cassandra.distributed.test;

import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.junit.Assert;
import org.junit.Test;

import org.apache.cassandra.distributed.Cluster;
import org.apache.cassandra.distributed.api.ICluster;
import org.apache.cassandra.distributed.api.IInstance;
import org.apache.cassandra.distributed.api.IInvokableInstance;
import org.apache.cassandra.distributed.shared.NetworkTopology;

import static org.apache.cassandra.distributed.api.Feature.GOSSIP;
import static org.apache.cassandra.distributed.api.Feature.NETWORK;

// TODO: this test should be removed after running in-jvm dtests is set up via the shared API repository
public class NetworkTopologyTest extends TestBaseImpl
{
    @Test
    public void namedDcTest() throws Throwable
    {
        try (ICluster<IInvokableInstance> cluster = builder()
                                                    .withNodeIdTopology(Collections.singletonMap(1, NetworkTopology.dcAndRack("somewhere", "rack0")))
                                                    .withRack("elsewhere", "firstrack", 1)
                                                    .withRack("elsewhere", "secondrack", 2)
                                                    .withDC("nearthere", 4)
                                                    .createWithoutStarting())
        {
            Assert.assertEquals(1, cluster.stream("somewhere").count());
            Assert.assertEquals(1, cluster.stream("elsewhere", "firstrack").count());
            Assert.assertEquals(2, cluster.stream("elsewhere", "secondrack").count());
            Assert.assertEquals(3, cluster.stream("elsewhere").count());
            Assert.assertEquals(4, cluster.stream("nearthere").count());

            Set<IInstance> expect = cluster.stream().collect(Collectors.toSet());
            Set<IInstance> result = Stream.concat(Stream.concat(cluster.stream("somewhere"),
                                                                cluster.stream("elsewhere")),
                                                  cluster.stream("nearthere")).collect(Collectors.toSet());
            Assert.assertEquals(expect, result);
        }
    }

    @Test
    public void automaticNamedDcTest() throws Throwable

    {
        try (ICluster cluster = builder().withRacks(2, 1, 3)
                                         .createWithoutStarting())
        {
            Assert.assertEquals(6, cluster.stream().count());
            Assert.assertEquals(3, cluster.stream("datacenter1").count());
            Assert.assertEquals(3, cluster.stream("datacenter2", "rack1").count());
        }
    }

    @Test(expected = IllegalStateException.class)
    public void noCountsAfterNamingDCsTest() throws IOException
    {
        builder().withDC("nameddc", 1)
                 .withDCs(1)
                 .createWithoutStarting();
    }

    @Test(expected = IllegalStateException.class)
    public void mustProvideNodeCountBeforeWithDCsTest() throws IOException
    {
        builder().withDCs(1)
                 .createWithoutStarting();
    }

    @Test(expected = IllegalStateException.class)
    public void noEmptyNodeIdTopologyTest()
    {
        builder().withNodeIdTopology(Collections.emptyMap());
    }

    @Test(expected = IllegalStateException.class)
    public void noHolesInNodeIdTopologyTest()
    {
        builder().withNodeIdTopology(Collections.singletonMap(2, NetworkTopology.dcAndRack("doomed", "rack")));
    }

    @Test
    public void noWarningForNetworkTopologyStategyConfigOnRestart() throws Exception {
        int nodesPerDc = 2;
        try (Cluster cluster = builder().withConfig(c -> c.with(GOSSIP, NETWORK))
                                        .withRacks(2, 1, nodesPerDc)
                                        .start()) {
            cluster.schemaChange("CREATE KEYSPACE " + KEYSPACE +
                                 " WITH replication = {'class': 'NetworkTopologyStrategy', " +
                                 "'datacenter1' : " + nodesPerDc + ", 'datacenter2' : " + nodesPerDc + " };");
            cluster.get(2).nodetool("flush");
            // Stop node 2 in datacenter 1
            cluster.get(2).shutdown().get();
            // Restart node 2 in datacenter 1
            cluster.get(2).startup();
            List<String> result = cluster.get(2).logs().grep("Ignoring Unrecognized strategy option \\{datacenter2\\}").getResult();
            Assert.assertTrue("Not expected to see the warning about unrecognized option", result.isEmpty());
        }
    }
}
