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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.dispatch;
import java.time.Duration;
import java.time.Instant;
/**
* Contains start and end time. Exposes a duration, and lets you measure the time difference between 2 requests.
* It does use System.nanoTime to get a steady clock.
*
* @author baldersheim
*/
class RequestDuration {
private final long startTime;
private long endTime;
RequestDuration() {
this(System.nanoTime());
}
private RequestDuration(long startTime) {
this.startTime = startTime;
}
RequestDuration complete() {
endTime = System.nanoTime();
return this;
}
private RequestDuration complete(long duration) {
endTime = startTime + duration;
return this;
}
Duration duration() {
return Duration.ofNanos(endTime - startTime);
}
Duration difference(RequestDuration prev) {
return Duration.ofNanos(Math.abs(endTime - prev.endTime));
}
static RequestDuration of(Duration duration) {
return new RequestDuration().complete(duration.toNanos());
}
static RequestDuration of(Instant sinceEpoch, Duration duration) {
return new RequestDuration(sinceEpoch.toEpochMilli()*1_000_000).complete(duration.toNanos());
}
}
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