1 /*
2 * Copyright 2015 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16
17 package io.netty.resolver.dns;
18
19 import java.net.InetSocketAddress;
20
21 /**
22 * An infinite stream of DNS server addresses.
23 */
24 public interface DnsServerAddressStream {
25 /**
26 * Retrieves the next DNS server address from the stream.
27 */
28 InetSocketAddress next();
29
30 /**
31 * Get the number of times {@link #next()} will return a distinct element before repeating or terminating.
32 * @return the number of times {@link #next()} will return a distinct element before repeating or terminating.
33 */
34 int size();
35
36 /**
37 * Duplicate this object. The result of this should be able to be independently iterated over via {@link #next()}.
38 * <p>
39 * Note that {@link #clone()} isn't used because it may make sense for some implementations to have the following
40 * relationship {@code x.duplicate() == x}.
41 * @return A duplicate of this object.
42 */
43 DnsServerAddressStream duplicate();
44 }