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Java example source code file (ShuffledDnsServerAddressStream.java)

This example Java source code file (ShuffledDnsServerAddressStream.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

inetsocketaddress, net, network, override, random, shuffleddnsserveraddressstream, string, util

The ShuffledDnsServerAddressStream.java Java example source code

/*
 * 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.ThreadLocalRandom;

import java.net.InetSocketAddress;
import java.util.Random;

final class ShuffledDnsServerAddressStream implements DnsServerAddressStream {

    private final InetSocketAddress[] addresses;
    private int i;

    ShuffledDnsServerAddressStream(InetSocketAddress[] addresses) {
        this.addresses = addresses.clone();

        shuffle();
    }

    private void shuffle() {
        final InetSocketAddress[] addresses = this.addresses;
        final Random r = ThreadLocalRandom.current();

        for (int i = addresses.length - 1; i >= 0; i --) {
            InetSocketAddress tmp = addresses[i];
            int j = r.nextInt(i + 1);
            addresses[i] = addresses[j];
            addresses[j] = tmp;
        }
    }

    @Override
    public InetSocketAddress next() {
        int i = this.i;
        InetSocketAddress next = addresses[i];
        if (++ i < addresses.length) {
            this.i = i;
        } else {
            this.i = 0;
            shuffle();
        }
        return next;
    }

    @Override
    public String toString() {
        return SequentialDnsServerAddressStream.toString("shuffled", i, addresses);
    }
}

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