mirror of https://github.com/GeyserMC/Geyser.git
68 lines
2.5 KiB
Java
68 lines
2.5 KiB
Java
/*
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* Copyright (c) 2019-2021 GeyserMC. http://geysermc.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @author GeyserMC
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* @link https://github.com/GeyserMC/Geyser
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*/
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package org.geysermc.floodgate.time;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ScheduledExecutorService;
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import java.util.concurrent.TimeUnit;
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public final class TimeSyncer {
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private final ScheduledExecutorService executorService = Executors.newScheduledThreadPool(1);
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private long timeOffset = Long.MIN_VALUE; // value when it failed to get the offset
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public TimeSyncer(String timeServer) {
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executorService.scheduleWithFixedDelay(() -> {
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// 5 tries to get the time offset, since UDP doesn't guaranty a response
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for (int i = 0; i < 5; i++) {
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long offset = SntpClientUtils.requestTimeOffset(timeServer, 3000);
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if (offset != Long.MIN_VALUE) {
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timeOffset = offset;
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return;
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}
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}
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}, 0, 30, TimeUnit.MINUTES);
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}
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public void shutdown() {
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executorService.shutdown();
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}
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public long getTimeOffset() {
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return timeOffset;
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}
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public long getRealMillis() {
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if (hasUsefulOffset()) {
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return System.currentTimeMillis() + getTimeOffset();
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}
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return System.currentTimeMillis();
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}
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public boolean hasUsefulOffset() {
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return timeOffset != Long.MIN_VALUE;
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}
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}
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