cassandra-trunk/test/unit/org/apache/cassandra/locator/ReplicationStrategyEndpointCacheTest.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.locator;

import org.apache.commons.lang3.StringUtils;
import org.junit.BeforeClass;
import org.junit.Test;

import org.apache.cassandra.SchemaLoader;
import org.apache.cassandra.Util;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.dht.RandomPartitioner.BigIntegerToken;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.schema.KeyspaceParams;

public class ReplicationStrategyEndpointCacheTest
{
    private TokenMetadata tmd;
    private Token searchToken;
    private AbstractReplicationStrategy strategy;
    public static final String KEYSPACE = "ReplicationStrategyEndpointCacheTest";

    @BeforeClass
    public static void defineSchema()
    {
        SchemaLoader.prepareServer();
        SchemaLoader.createKeyspace(KEYSPACE, KeyspaceParams.simple(5));
    }

    public void setup() throws Exception
    {
        tmd = new TokenMetadata();
        searchToken = new BigIntegerToken(String.valueOf(15));
        strategy = getStrategyWithNewTokenMetadata(Keyspace.open(KEYSPACE).getReplicationStrategy(), tmd);

        for (int i = 1; i <= 8; i++)
            tmd.updateNormalToken(new BigIntegerToken(String.valueOf(i * 10)), InetAddressAndPort.getByName("127.0.0." + i));
    }

    @Test
    public void testEndpointsWereCached() throws Exception
    {
        setup();
        Util.assertRCEquals(strategy.getNaturalReplicasForToken(searchToken), strategy.getNaturalReplicasForToken(searchToken));
    }

    @Test
    public void testCacheRespectsTokenChanges() throws Exception
    {
        setup();
        EndpointsForToken initial;
        EndpointsForToken replicas;

        replicas = strategy.getNaturalReplicasForToken(searchToken);
        assert replicas.size() == 5 : StringUtils.join(replicas, ",");

        // test token addition, in DC2 before existing token
        initial = strategy.getNaturalReplicasForToken(searchToken);
        tmd.updateNormalToken(new BigIntegerToken(String.valueOf(35)), InetAddressAndPort.getByName("127.0.0.5"));
        replicas = strategy.getNaturalReplicasForToken(searchToken);
        assert replicas.size() == 5 : StringUtils.join(replicas, ",");
        Util.assertNotRCEquals(replicas, initial);

        // test token removal, newly created token
        initial = strategy.getNaturalReplicasForToken(searchToken);
        tmd.removeEndpoint(InetAddressAndPort.getByName("127.0.0.5"));
        replicas = strategy.getNaturalReplicasForToken(searchToken);
        assert replicas.size() == 5 : StringUtils.join(replicas, ",");
        assert !replicas.endpoints().contains(InetAddressAndPort.getByName("127.0.0.5"));
        Util.assertNotRCEquals(replicas, initial);

        // test token change
        initial = strategy.getNaturalReplicasForToken(searchToken);
        //move .8 after search token but before other DC3
        tmd.updateNormalToken(new BigIntegerToken(String.valueOf(25)), InetAddressAndPort.getByName("127.0.0.8"));
        replicas = strategy.getNaturalReplicasForToken(searchToken);
        assert replicas.size() == 5 : StringUtils.join(replicas, ",");
        Util.assertNotRCEquals(replicas, initial);
    }

    private AbstractReplicationStrategy getStrategyWithNewTokenMetadata(AbstractReplicationStrategy strategy, TokenMetadata newTmd) throws ConfigurationException
    {
        return AbstractReplicationStrategy.createReplicationStrategy(
                                                                    strategy.keyspaceName,
                                                                    AbstractReplicationStrategy.getClass(strategy.getClass().getName()),
                                                                    newTmd,
                                                                    strategy.snitch,
                                                                    strategy.configOptions);
    }

}
