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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* 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
*
* 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
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package org.apache.cassandra.locator;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import org.junit.Test;
import static org.junit.Assert.*;
import org.apache.cassandra.locator.DynamicEndpointSnitch;
import org.apache.cassandra.locator.SimpleSnitch;
import org.apache.cassandra.utils.FBUtilities;
public class DynamicEndpointSnitchTest
{
@Test
public void testSnitch() throws UnknownHostException, InterruptedException
{
DynamicEndpointSnitch dsnitch = new DynamicEndpointSnitch(new SimpleSnitch());
InetAddress self = FBUtilities.getLocalAddress();
ArrayList<InetAddress> order = new ArrayList<InetAddress>();
InetAddress host1 = InetAddress.getByName("127.0.0.1");
InetAddress host2 = InetAddress.getByName("127.0.0.2");
InetAddress host3 = InetAddress.getByName("127.0.0.3");
// first, make all hosts equal
for (int i = 0; i < 5; i++)
{
dsnitch.receiveTiming(host1, 1.0);
dsnitch.receiveTiming(host2, 1.0);
dsnitch.receiveTiming(host3, 1.0);
}
Thread.sleep(1500);
order.add(host1);
order.add(host2);
order.add(host3);
assert dsnitch.getSortedListByProximity(self, order).equals(order);
// make host1 a little worse
dsnitch.receiveTiming(host1, 2.0);
Thread.sleep(1500);
order.clear();
order.add(host2);
order.add(host3);
order.add(host1);
assert dsnitch.getSortedListByProximity(self, order).equals(order);
// make host2 a little worse
dsnitch.receiveTiming(host2, 2.0);
Thread.sleep(1500);
order.clear();
order.add(host3);
order.add(host2);
order.add(host1);
assert dsnitch.getSortedListByProximity(self, order).equals(order);
// make host3 the worst
for (int i = 0; i < 2; i++)
{
dsnitch.receiveTiming(host3, 2.0);
}
Thread.sleep(1500);
order.clear();
order.add(host2);
order.add(host1);
order.add(host3);
// make host3 equal to the others
for (int i = 0; i < 2; i++)
{
dsnitch.receiveTiming(host3, 1.0);
}
Thread.sleep(1500);
order.clear();
order.add(host1);
order.add(host2);
order.add(host3);
assert dsnitch.getSortedListByProximity(self, order).equals(order);
}
}