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Correct poor synchronization on NTP offset, potentially fixing issue #22

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catbref 2020-08-31 10:24:10 +01:00
parent 84dba739d9
commit 3e19516f62
1 changed files with 5 additions and 2 deletions
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7
src/main/java/org/qortal/utils/NTP.java
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@ -28,7 +28,8 @@ public class NTP implements Runnable {
private static volatile boolean isStopping = false;
private static ExecutorService instanceExecutor;
private static NTP instance;
private static volatile Long offset = null;
private static volatile boolean isOffsetSet = false;
private static volatile long offset = 0;
static class NTPServer {
private static final int MIN_POLL = 64;
@ -136,6 +137,7 @@ public class NTP implements Runnable {
public static synchronized void setFixedOffset(Long offset) {
// Fix offset, e.g. for testing
NTP.offset = offset;
isOffsetSet = true;
}
/**
@ -144,7 +146,7 @@ public class NTP implements Runnable {
* @return internet time (ms), or null if unsynchronized.
*/
public static Long getTime() {
if (NTP.offset == null)
if (!isOffsetSet)
return null;
return System.currentTimeMillis() + NTP.offset;
@ -248,6 +250,7 @@ public class NTP implements Runnable {
thresholdStddev, filteredMean, filteredStddev, numberValues, ntpServers.size()));
NTP.offset = (long) filteredMean;
isOffsetSet = true;
LOGGER.debug(() -> String.format("New NTP offset: %d", NTP.offset));
}
}