130 lines
4.2 KiB
Java
130 lines
4.2 KiB
Java
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.resolver.dns;
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import io.netty.util.NetUtil;
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import org.junit.Test;
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import java.net.InetSocketAddress;
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import java.util.Collections;
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import java.util.IdentityHashMap;
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import java.util.Iterator;
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import java.util.Set;
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import static org.hamcrest.Matchers.*;
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import static org.junit.Assert.*;
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public class DnsServerAddressesTest {
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private static final InetSocketAddress ADDR1 = new InetSocketAddress(NetUtil.LOCALHOST, 1);
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private static final InetSocketAddress ADDR2 = new InetSocketAddress(NetUtil.LOCALHOST, 2);
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private static final InetSocketAddress ADDR3 = new InetSocketAddress(NetUtil.LOCALHOST, 3);
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@Test
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public void testDefaultAddresses() {
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assertThat(DnsServerAddresses.defaultAddresses().size(), is(greaterThan(0)));
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}
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@Test
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public void testSequential() {
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Iterable<InetSocketAddress> seq = DnsServerAddresses.sequential(ADDR1, ADDR2, ADDR3);
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assertThat(seq.iterator(), is(not(sameInstance(seq.iterator()))));
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for (int j = 0; j < 2; j ++) {
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Iterator<InetSocketAddress> i = seq.iterator();
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assertNext(i, ADDR1);
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assertNext(i, ADDR2);
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assertNext(i, ADDR3);
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assertNext(i, ADDR1);
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assertNext(i, ADDR2);
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assertNext(i, ADDR3);
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}
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}
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@Test
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public void testRotational() {
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Iterable<InetSocketAddress> seq = DnsServerAddresses.rotational(ADDR1, ADDR2, ADDR3);
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Iterator<InetSocketAddress> i = seq.iterator();
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assertNext(i, ADDR1);
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assertNext(i, ADDR2);
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assertNext(i, ADDR3);
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assertNext(i, ADDR1);
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assertNext(i, ADDR2);
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assertNext(i, ADDR3);
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i = seq.iterator();
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assertNext(i, ADDR2);
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assertNext(i, ADDR3);
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assertNext(i, ADDR1);
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assertNext(i, ADDR2);
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assertNext(i, ADDR3);
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assertNext(i, ADDR1);
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i = seq.iterator();
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assertNext(i, ADDR3);
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assertNext(i, ADDR1);
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assertNext(i, ADDR2);
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assertNext(i, ADDR3);
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assertNext(i, ADDR1);
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assertNext(i, ADDR2);
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i = seq.iterator();
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assertNext(i, ADDR1);
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assertNext(i, ADDR2);
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assertNext(i, ADDR3);
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assertNext(i, ADDR1);
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assertNext(i, ADDR2);
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assertNext(i, ADDR3);
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}
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@Test
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public void testShuffled() {
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Iterable<InetSocketAddress> seq = DnsServerAddresses.shuffled(ADDR1, ADDR2, ADDR3);
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// Ensure that all three addresses are returned by the iterator.
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// In theory, this test can fail at extremely low chance, but we don't really care.
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Set<InetSocketAddress> set = Collections.newSetFromMap(new IdentityHashMap<InetSocketAddress, Boolean>());
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Iterator<InetSocketAddress> i = seq.iterator();
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for (int j = 0; j < 1048576; j ++) {
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assertThat(i.hasNext(), is(true));
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set.add(i.next());
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}
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assertThat(set.size(), is(3));
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assertThat(seq.iterator(), is(not(sameInstance(seq.iterator()))));
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}
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@Test
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public void testSingleton() {
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Iterable<InetSocketAddress> seq = DnsServerAddresses.singleton(ADDR1);
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// Should return the same iterator instance for least possible footprint.
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assertThat(seq.iterator(), is(sameInstance(seq.iterator())));
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Iterator<InetSocketAddress> i = seq.iterator();
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assertNext(i, ADDR1);
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assertNext(i, ADDR1);
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assertNext(i, ADDR1);
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}
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private static void assertNext(Iterator<InetSocketAddress> i, InetSocketAddress addr) {
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assertThat(i.hasNext(), is(true));
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assertThat(i.next(), is(sameInstance(addr)));
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}
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}
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