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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.mobicents.media.server.scheduler;

import java.util.concurrent.TimeUnit;

/**
 * Media server internal clock.
 * 
 * @author kulikov
 */
public interface Clock {
    
    /**
     * Gets the elapsed time.
     * 
     * @return current time expressed in nanoseconds.
     */
    long getTime();
    
    /**
     * Gets the current time.
     * 
     * @return An absolute time stamp in milliseconds
     */
    long getCurrentTime();

    /**
     * Gets the current time.
     *
     * @param timeUnit the time measurement units.
     * @return the value in specified units.
     */
    long getTime(TimeUnit timeUnit);

    /**
     * Gets the time measurement units.
     *
     * @return the time measurement units.
     */
    TimeUnit getTimeUnit();
}