NetworkTopologyStrategyTest.java

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package org.apache.cassandra.locator;

import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.xml.parsers.ParserConfigurationException;

import org.junit.Test;

import org.apache.cassandra.config.ConfigurationException;
import org.apache.cassandra.dht.StringToken;
import org.apache.cassandra.dht.Token;
import org.xml.sax.SAXException;

public class NetworkTopologyStrategyTest
{
    private String table = "Keyspace1";

    @Test
    public void testProperties() throws IOException, ParserConfigurationException, SAXException, ConfigurationException
    {
        IEndpointSnitch snitch = new PropertyFileSnitch();
        TokenMetadata metadata = new TokenMetadata();
        createDummyTokens(metadata, true);

        Map<String, String> configOptions = new HashMap<String, String>();
        configOptions.put("DC1", "3");
        configOptions.put("DC2", "2");
        configOptions.put("DC3", "1");

        // Set the localhost to the tokenmetadata. Embedded cassandra way?
        NetworkTopologyStrategy strategy = new NetworkTopologyStrategy(table, metadata, snitch, configOptions);
        assert strategy.getReplicationFactor("DC1") == 3;
        assert strategy.getReplicationFactor("DC2") == 2;
        assert strategy.getReplicationFactor("DC3") == 1;
        // Query for the natural hosts
        Set<InetAddress> endpoints = strategy.getNaturalEndpoints(new StringToken("123")).keySet();
        assert 6 == endpoints.size();
        //assert 6 == new HashSet<InetAddress>(endpoints).size(); // ensure uniqueness
    }

    @Test
    public void testPropertiesWithEmptyDC() throws IOException, ParserConfigurationException, SAXException, ConfigurationException
    {
        IEndpointSnitch snitch = new PropertyFileSnitch();
        TokenMetadata metadata = new TokenMetadata();
        createDummyTokens(metadata, false);

        Map<String, String> configOptions = new HashMap<String, String>();
        configOptions.put("DC1", "3");
        configOptions.put("DC2", "3");
        configOptions.put("DC3", "0");

        // Set the localhost to the tokenmetadata. Embedded cassandra way?
        NetworkTopologyStrategy strategy = new NetworkTopologyStrategy(table, metadata, snitch, configOptions);
        assert strategy.getReplicationFactor("DC1") == 3;
        assert strategy.getReplicationFactor("DC2") == 3;
        assert strategy.getReplicationFactor("DC3") == 0;
        // Query for the natural hosts
        Set<InetAddress> endpoints = strategy.getNaturalEndpoints(new StringToken("123")).keySet();
        assert 6 == endpoints.size();
        //assert 6 == new HashSet<InetAddress>(endpoints).size(); // ensure uniqueness
    }

    public void createDummyTokens(TokenMetadata metadata, boolean populateDC3) throws UnknownHostException
    {
        // DC 1
        tokenFactory(metadata, "123", new byte[]{ 10, 0, 0, 10 });
        tokenFactory(metadata, "234", new byte[]{ 10, 0, 0, 11 });
        tokenFactory(metadata, "345", new byte[]{ 10, 0, 0, 12 });
        // Tokens for DC 2
        tokenFactory(metadata, "789", new byte[]{ 10, 20, 114, 10 });
        tokenFactory(metadata, "890", new byte[]{ 10, 20, 114, 11 });
        //tokens for DC3
        if (populateDC3)
        {
            tokenFactory(metadata, "456", new byte[]{ 10, 21, 119, 13 });
            tokenFactory(metadata, "567", new byte[]{ 10, 21, 119, 10 });
        }
        // Extra Tokens
        tokenFactory(metadata, "90A", new byte[]{ 10, 0, 0, 13 });
        if (populateDC3)
            tokenFactory(metadata, "0AB", new byte[]{ 10, 21, 119, 14 });
        tokenFactory(metadata, "ABC", new byte[]{ 10, 20, 114, 15 });
    }

    public void tokenFactory(TokenMetadata metadata, String token, byte[] bytes) throws UnknownHostException
    {
        Token token1 = new StringToken(token);
        InetAddress add1 = InetAddress.getByAddress(bytes);
        metadata.updateNormalToken(token1, add1);
    }
}