49 lines
1.7 KiB
Java
49 lines
1.7 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 java.net.InetSocketAddress;
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import java.util.List;
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import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
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final class RotationalDnsServerAddresses extends DefaultDnsServerAddresses {
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private static final AtomicIntegerFieldUpdater<RotationalDnsServerAddresses> startIdxUpdater =
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AtomicIntegerFieldUpdater.newUpdater(RotationalDnsServerAddresses.class, "startIdx");
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@SuppressWarnings("UnusedDeclaration")
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private volatile int startIdx;
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RotationalDnsServerAddresses(List<InetSocketAddress> addresses) {
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super("rotational", addresses);
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}
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@Override
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public DnsServerAddressStream stream() {
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for (;;) {
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int curStartIdx = startIdx;
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int nextStartIdx = curStartIdx + 1;
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if (nextStartIdx >= addresses.size()) {
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nextStartIdx = 0;
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}
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if (startIdxUpdater.compareAndSet(this, curStartIdx, nextStartIdx)) {
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return new SequentialDnsServerAddressStream(addresses, curStartIdx);
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}
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}
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}
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}
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