netty5/resolver-dns/src/main/java/io/netty/resolver/dns/ShuffledDnsServerAddressStream.java
jimin 9621a5b981 remove unused imports (#9287)
Motivation:

Some imports are not used

Modification:

remove unused imports

Result:

Code cleanup
2019-06-26 21:08:31 +02:00

78 lines
2.2 KiB
Java

/*
* Copyright 2015 The Netty Project
*
* The Netty Project 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 specific language governing permissions and limitations
* under the License.
*/
package io.netty.resolver.dns;
import io.netty.util.internal.PlatformDependent;
import java.net.InetSocketAddress;
import java.util.Collections;
import java.util.List;
final class ShuffledDnsServerAddressStream implements DnsServerAddressStream {
private final List<InetSocketAddress> addresses;
private int i;
/**
* Create a new instance.
* @param addresses The addresses are not cloned. It is assumed the caller has cloned this array or otherwise will
* not modify the contents.
*/
ShuffledDnsServerAddressStream(List<InetSocketAddress> addresses) {
this.addresses = addresses;
shuffle();
}
private ShuffledDnsServerAddressStream(List<InetSocketAddress> addresses, int startIdx) {
this.addresses = addresses;
i = startIdx;
}
private void shuffle() {
Collections.shuffle(addresses, PlatformDependent.threadLocalRandom());
}
@Override
public InetSocketAddress next() {
int i = this.i;
InetSocketAddress next = addresses.get(i);
if (++ i < addresses.size()) {
this.i = i;
} else {
this.i = 0;
shuffle();
}
return next;
}
@Override
public int size() {
return addresses.size();
}
@Override
public ShuffledDnsServerAddressStream duplicate() {
return new ShuffledDnsServerAddressStream(addresses, i);
}
@Override
public String toString() {
return SequentialDnsServerAddressStream.toString("shuffled", i, addresses);
}
}