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[JENKINS-72157] ensure uptime is independent of system clock #8771

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merged 1 commit into from
Dec 13, 2023
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[JENKINS-72157] ensure uptime is independent of system clock #8771

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8 changes: 7 additions & 1 deletion core/src/main/java/jenkins/model/Uptime.java
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
@Extension
public class Uptime {
private long startTime;
private long startNanos;

/**
* Timestamp in which Jenkins became fully up and running.
Expand All @@ -21,12 +22,17 @@ public long getStartTime() {
return startTime;
}

/**
* Duration in milliseconds since Jenkins became available
* @return uptime in milliseconds
*/
public long getUptime() {
return System.currentTimeMillis() - startTime;
return (System.nanoTime() - startNanos) / 1000000L;
}

@Initializer(after = InitMilestone.JOB_CONFIG_ADAPTED)
public void init() {
startTime = System.currentTimeMillis();
startNanos = System.nanoTime();
}
}
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