com.xceptance.common.util.ProcessUtils Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of xlt Show documentation

XLT (Xceptance LoadTest) is an extensive load and performance test tool developed and maintained by Xceptance.

There is a newer version: 8.1.0

/*
 * Copyright (c) 2005-2022 Xceptance Software Technologies GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.xceptance.common.util;

import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;

/**
 * Utility class that provides convenient methods regarding ordinary java objects.
 */
public final class ProcessUtils
{
    /**
     * 
     */
    private static final long startTime;

    /**
     * Class constructor.
     */
    static
    {
        // initialize startTime using the current uptime
        final long now = System.nanoTime() / 1000000;
        startTime = now - ManagementFactory.getRuntimeMXBean().getUptime();
    }

    /**
     * Default constructor. Declared private to prevent external instantiation.
     */
    private ProcessUtils()
    {
    }

    /**
     * Returns the uptime of the current process. This method is intended to replace {@link RuntimeMXBean#getUptime()}
     * as that method uses {@link System#currentTimeMillis()}, which is affected by time corrections.
     * 
     * @return the uptime [ms]
     */
    public static long getUptime()
    {
        final long now = System.nanoTime() / 1000000;
        return now - startTime;
    }
}