9621a5b981
Motivation: Some imports are not used Modification: remove unused imports Result: Code cleanup
78 lines
2.2 KiB
Java
78 lines
2.2 KiB
Java
/*
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* Copyright 2015 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.internal.PlatformDependent;
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import java.net.InetSocketAddress;
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import java.util.Collections;
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import java.util.List;
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final class ShuffledDnsServerAddressStream implements DnsServerAddressStream {
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private final List<InetSocketAddress> addresses;
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private int i;
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/**
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* Create a new instance.
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* @param addresses The addresses are not cloned. It is assumed the caller has cloned this array or otherwise will
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* not modify the contents.
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*/
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ShuffledDnsServerAddressStream(List<InetSocketAddress> addresses) {
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this.addresses = addresses;
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shuffle();
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}
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private ShuffledDnsServerAddressStream(List<InetSocketAddress> addresses, int startIdx) {
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this.addresses = addresses;
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i = startIdx;
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}
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private void shuffle() {
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Collections.shuffle(addresses, PlatformDependent.threadLocalRandom());
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}
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@Override
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public InetSocketAddress next() {
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int i = this.i;
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InetSocketAddress next = addresses.get(i);
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if (++ i < addresses.size()) {
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this.i = i;
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} else {
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this.i = 0;
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shuffle();
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}
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return next;
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}
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@Override
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public int size() {
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return addresses.size();
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}
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@Override
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public ShuffledDnsServerAddressStream duplicate() {
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return new ShuffledDnsServerAddressStream(addresses, i);
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}
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@Override
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public String toString() {
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return SequentialDnsServerAddressStream.toString("shuffled", i, addresses);
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}
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}
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