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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.time;
import org.junit.Test;
import static org.junit.Assert.assertTrue;
public class WallClockSourceTestCase {
@Test
public void testSimple() {
long actualBefore = System.currentTimeMillis();
WallClockSource clock = new WallClockSource();
long nanos = clock.currentTimeNanos();
long micros = nanos / 1000;
long millis = micros / 1000;
long actualAfter = System.currentTimeMillis();
assertTrue(actualBefore <= millis);
assertTrue(millis <= actualAfter);
}
@Test
public void testWithAdjust() {
WallClockSource clock = new WallClockSource();
long diffB = 0;
long diffA = 0;
for (int i = 0; i < 66666; i++) {
long actualB = System.currentTimeMillis();
clock.adjust();
long nanos = clock.currentTimeNanos();
long actualA = System.currentTimeMillis();
long micros = nanos / 1000;
long millis = micros / 1000;
diffB = Math.max(diffB, actualB - millis);
diffA = Math.max(diffA, millis - actualA);
// System.out.println("adj Timing values, before: "+actualB+" <= guess: "+millis+" <= after: "+actualA);
}
System.out.println("adjust test: biggest difference (beforeTime - guess): "+diffB);
System.out.println("adjust test: biggest difference (guess - afterTime): "+diffA);
assertTrue("actual time before sample must be <= wallclocksource, diff: " + diffB, diffB < 2);
assertTrue("actual time after sample must be >= wallclocksource, diff: " + diffA, diffA < 2);
}
@Test
public void testNoAdjust() {
WallClockSource clock = new WallClockSource();
long diffB = 0;
long diffA = 0;
for (int i = 0; i < 66666; i++) {
long actualB = System.currentTimeMillis();
long nanos = clock.currentTimeNanos();
long actualA = System.currentTimeMillis();
long micros = nanos / 1000;
long millis = micros / 1000;
diffB = Math.max(diffB, actualB - millis);
diffA = Math.max(diffA, millis - actualA);
// System.out.println("noadj Timing values, before: "+actualB+" <= guess: "+millis+" <= after: "+actualA);
}
System.out.println("noadjust test: biggest difference (beforeTime - guess): "+diffB);
System.out.println("noadjust test: biggest difference (guess - afterTime): "+diffA);
assertTrue("actual time before sample must be <= wallclocksource, diff: " + diffB, diffB < 3);
assertTrue("actual time after sample must be >= wallclocksource, diff: " + diffA, diffA < 3);
}
@Test
public void testAutoAdjust() {
WallClockSource clock = WallClockSource.get();
long diffB = 0;
long diffA = 0;
for (int i = 0; i < 66666; i++) {
long actualB = System.currentTimeMillis();
long nanos = clock.currentTimeNanos();
long actualA = System.currentTimeMillis();
long micros = nanos / 1000;
long millis = micros / 1000;
diffB = Math.max(diffB, actualB - millis);
diffA = Math.max(diffA, millis - actualA);
// System.out.println("noadj Timing values, before: "+actualB+" <= guess: "+millis+" <= after: "+actualA);
}
System.out.println("autoadjust test: biggest difference (beforeTime - guess): "+diffB);
System.out.println("autoadjust test: biggest difference (guess - afterTime): "+diffA);
assertTrue("actual time before sample must be <= wallclocksource, diff: " + diffB, diffB < 3);
assertTrue("actual time after sample must be >= wallclocksource, diff: " + diffA, diffA < 3);
}
}
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