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Interim replacement for JSR 77 Stats and Statistics

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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.j2ee.statistics;

/**
 * Specifies standard measurements of the lowest and highest values an attribute has held as well as its current value.
 */
public interface RangeStatistic extends Statistic {
    /**
     * The highest value this attribute has held since the beginning of the measurement.
     */
    long getHighWaterMark();

    /**
     * The lowest value this attribute has held since the beginning of the measurement.
     */
    long getLowWaterMark();

    /**
     * The current value of this attribute.
     */
    long getCurrent();
}