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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
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 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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package com.sun.org.glassfish.external.statistics;

/**
 * The Statistic model and its sub-models specify the data models which are requried to be used to provide the performance data described by the specific attributes in the Stats models. 
 */
public interface Statistic {
    /**
     * The name of this Statistic. 
     */
    String getName();

    /**
     * The unit of measurement for this Statistic.
     * Valid values for TimeStatistic measurements are "HOUR", "MINUTE", "SECOND", "MILLISECOND", "MICROSECOND" and "NANOSECOND". 
     */
    String getUnit();

    /**
     * A human-readable description of the Statistic. 
     */
    String getDescription();

    /**
     * The time of the first measurement represented as a long, whose value is the number of milliseconds since January 1, 1970, 00:00:00. 
     */
    long getStartTime();

    /**
     * The time of the last measurement represented as a long, whose value is the number of milliseconds since January 1, 1970, 00:00:00. 
     */
    long getLastSampleTime();
}