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Glassfish example source code file (CountStatisticImpl.java)

This example Glassfish source code file (CountStatisticImpl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Glassfish tags/keywords

count, count, countstatistic, countstatisticimpl, countstatisticimpl, default_unit, default_value, newline, statisticimpl, statisticimpl, string, string, stringmanager, util

The Glassfish CountStatisticImpl.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */

package com.sun.enterprise.admin.monitor.stats;
import org.glassfish.j2ee.statistics.CountStatistic;
import com.sun.enterprise.util.i18n.StringManager;

/** An implementation of a CountStatistic. All instances of this class are
 * immutable. Provides all the necessary accessors for properties.
 * @author Muralidhar Vempaty
 * @author Kedar Mhaswade
 * @since S1AS8.0
 * @verison 1.0
 */

public class CountStatisticImpl extends StatisticImpl implements CountStatistic {
    
    private long count;
    private static final StringManager localStrMgr = 
                StringManager.getManager(CountStatisticImpl.class);

	/**
	 * Constructs an instance of this class with following default values:
	 * <ul>
	 *	<li> Unit is empty string. 
	 *	<li> Current Value is StatisticImpl#DEFAULT_VALUE. 
	 *	<li> Description is calculated from the name passed in. This may well be read from a properties file to address i18n. 
	 *	<li> LastSampleTime is time at the time of calling this method.
	 *	<li> StartTime is the same as LastSampleTime. 
	 * </ul>
	 * @param	name			String indicating the name of the statistic
	 */
	public CountStatisticImpl(String name) {
		this(name, DEFAULT_UNIT);
	}
	/**
	 * Constructs an instance of this class with following default values:
	 * <ul>
	 *	<li> Current Value is StatisticImpl#DEFAULT_VALUE. 
	 *	<li> Description is calculated from the name passed in. This may well be read from a properties file to address i18n. 
	 *	<li> LastSampleTime is time at the time of calling this method.
	 *	<li> StartTime is the same as LastSampleTime. 
	 * </ul>
	 * @param	name			String indicating the name of the statistic
	 * @param	unit			String indicating the unit of the statistic
	 */
	public CountStatisticImpl(String name, String unit) {
		this(name, unit, DEFAULT_VALUE);
	}
    /**
	 * Constructs an instance of this class with following default values:
	 * <ul>
	 *	<li> Description is calculated from the name passed in. This may well be read from a properties file to address i18n. 
	 *	<li> LastSampleTime is time at the time of calling this method.
	 *	<li> StartTime is the same as LastSampleTime. 
	 * </ul>
	 * @param	name			String indicating the name of the statistic
	 * @param	unit			String indicating the unit of the statistic
     * @param   desc            A brief description of the statistic
	 */
	public CountStatisticImpl(String name, String unit, String desc) {
		this(DEFAULT_VALUE, name, unit, desc, Util.getInitTime()[0], Util.getInitTime()[1]);
	}
	/**
	 * Constructs an instance of this class with following default values:
	 * <ul>
	 *	<li> Description is calculated from the name passed in. This may well be read from a properties file to address i18n. 
	 *	<li> LastSampleTime is time at the time of calling this method.
	 *	<li> StartTime is the same as LastSampleTime. 
	 * </ul>
	 * @param	name			String indicating the name of the statistic
	 * @param	unit			String indicating the unit of the statistic
	 * @param	value			long indicating the unit of the statistic
	 */
	public CountStatisticImpl(String name, String unit, long value) {
		this(value, name, unit, Util.getDescriptionFromName(name), Util.getInitTime()[0], Util.getInitTime()[1]);
	}

	/** Constructs an immutable instance of CountStatistic with given parameters.
     * @param curVal    The current value of this statistic
     * @param name      The name of the statistic
     * @param unit      The unit of measurement for this statistic
     * @param desc      A brief description of the statistic
     * @param startTime Time in milliseconds at which the measurement was started
     * @param sampleTime Time at which the last measurement was done.
     **/
    public CountStatisticImpl(long countVal, String name, String unit, 
                              String desc, long sampleTime, long startTime) {
        
        super(name, unit, desc, startTime, sampleTime);
        count = countVal; 
    }
    
    public String toString() {
        return super.toString() + NEWLINE + "Count: " + getCount();
    }


    /**
     * Returns the current value of this statistic.
	 * @return long indicating current value
     */
    public long getCount() {
        return count;
    }
	
	private static class Util {
		/** A method to get the description from a name. Can be simple property file
		 * pair reader. Note that name is invariant, whereas the descriptions are
		 * localizable.
		 */
		private static String getDescriptionFromName(String name) {
			return (localStrMgr.getString("describes_string") + name);
		}

		/** Returns an array of two longs, that represent the times at the time of call.
		 * The idea is not to call expensive System#currentTimeMillis twice for two
		 * successive operations.
		 */
		private static long[] getInitTime() {
			final long time = System.currentTimeMillis();
			return ( new long[]{time, time} );
		}
	}
}

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