mirror of https://github.com/apache/cloudstack.git
116 lines
3.9 KiB
Java
116 lines
3.9 KiB
Java
//
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// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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//
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package com.cloud.utils;
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import org.apache.log4j.Logger;
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import org.junit.Assert;
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import org.junit.Test;
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import com.cloud.utils.testcase.Log4jEnabledTestCase;
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public class TestProfiler extends Log4jEnabledTestCase {
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protected final static Logger s_logger = Logger.getLogger(TestProfiler.class);
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private static final long ONE_SECOND = 1000l;
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private static final long MILLIS_FACTOR = 1000l;
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private static final int MARGIN = 100;
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private static final double EXPONENT = 3d;
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@Test
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public void testProfilerInMillis() {
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s_logger.info("testProfiler() started");
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final Profiler pf = new Profiler();
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pf.start();
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try {
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Thread.sleep(ONE_SECOND);
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} catch (final InterruptedException e) {
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}
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pf.stop();
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final long durationInMillis = pf.getDurationInMillis();
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s_logger.info("Duration in Millis: " + durationInMillis);
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// An error margin in order to cover the time taken by the star/stop calls.
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// 100 milliseconds margin seems too much, but it will avoid assertion error
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// and also fail in case a duration in nanoseconds is used instead.
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Assert.assertTrue(durationInMillis >= MILLIS_FACTOR && durationInMillis <= MILLIS_FACTOR + MARGIN);
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s_logger.info("testProfiler() stopped");
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}
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@Test
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public void testProfilerInNano() {
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final Profiler pf = new Profiler();
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pf.start();
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try {
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Thread.sleep(ONE_SECOND);
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} catch (final InterruptedException e) {
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}
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pf.stop();
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final long duration = pf.getDuration();
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s_logger.info("Duration in Nano: " + duration);
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Assert.assertTrue(duration >= Math.pow(MILLIS_FACTOR, EXPONENT));
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}
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@Test
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public void testProfilerNoStart() {
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final Profiler pf = new Profiler();
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try {
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Thread.sleep(20);
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} catch (final InterruptedException e) {
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}
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pf.stop();
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Assert.assertTrue(pf.getDurationInMillis() == -1);
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Assert.assertFalse(pf.isStarted());
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}
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@Test
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public void testProfilerNoStop() {
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final Profiler pf = new Profiler();
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pf.start();
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try {
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Thread.sleep(20);
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} catch (final InterruptedException e) {
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}
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Assert.assertTrue(pf.getDurationInMillis() == -1);
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Assert.assertFalse(pf.isStopped());
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}
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@Test
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public void testResolution() {
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long nanoTime1 = 0l;
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long nanoTime2 = 0l;
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nanoTime1 = System.nanoTime();
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nanoTime2 = System.nanoTime();
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// Using sysout here because is faster than the logger and we don't want to
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// waste time.
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System.out.println("Nano time 1: " + nanoTime1);
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System.out.println("Nano time 2: " + nanoTime2);
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// We are measuring the elapsed time in 2 consecutive calls of System.nanoTime()
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// That's the same as 0.002 milliseconds or 2000 nanoseconds.
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Assert.assertTrue("Expected exactly 2 but it took more than 3 microseconds between 2 consecutive calls to System.nanoTime().", nanoTime2 - nanoTime1 <= 3000);
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}
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} |