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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>
* <li> Current Value is StatisticImpl#DEFAULT_VALUE. </li>
* <li> Description is calculated from the name passed in. This may well be read from a properties file to address i18n. </li>
* <li> LastSampleTime is time at the time of calling this method.</li>
* <li> StartTime is the same as LastSampleTime. </li>
* </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>
* <li> Description is calculated from the name passed in. This may well be read from a properties file to address i18n. </li>
* <li> LastSampleTime is time at the time of calling this method.</li>
* <li> StartTime is the same as LastSampleTime. </li>
* </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>
* <li> LastSampleTime is time at the time of calling this method.</li>
* <li> StartTime is the same as LastSampleTime. </li>
* </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>
* <li> LastSampleTime is time at the time of calling this method.</li>
* <li> StartTime is the same as LastSampleTime. </li>
* </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} );
}
}
}