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/*
* Copyright 2004-2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* $Id: MutableBoundedRangeStatisticImpl.java,v 1.3 2007/05/05 05:25:48 tcfujii Exp $
* $Date: 2007/05/05 05:25:48 $
* $Revision: 1.3 $
*/
package com.sun.enterprise.admin.monitor.stats;
import javax.management.j2ee.statistics.BoundedRangeStatistic;
import com.sun.enterprise.admin.monitor.stats.BoundedRangeStatisticImpl;
import javax.management.j2ee.statistics.Statistic;
/** An implementation of MutableCountStatistic that provides ways to change the state externally through mutators.
* Convenience class that is useful for components that gather the statistical data.
* By merely changing the count (which is a mandatory measurement), rest of the statistical
* information could be deduced.
* @author Kedar Mhaswade
* @see BoundedRangeStatisticImpl for an immutable implementation
* @since S1AS8.0
* @version 1.0
*/
public class MutableBoundedRangeStatisticImpl implements BoundedRangeStatistic, MutableCountStatistic {
private final BoundedRangeStatistic initial;
private long current;
private long lastSampleTime;
private long startTime;
private long lowWaterMark;
private long highWaterMark;
/** Constructs an instance of MutableCountStatistic that encapsulates the given Statistic.
* The only parameter denotes the initial state of this statistic. It is
* guaranteed that the initial state is preserved internally, so that one
* can reset to the initial state.
* @param initial an instance of BoundedRangeStatistic that represents initial state
*/
public MutableBoundedRangeStatisticImpl(BoundedRangeStatistic initial) {
this.initial = initial;
this.current = initial.getCurrent();
this.lastSampleTime = initial.getLastSampleTime();
this.startTime = initial.getStartTime();
this.lowWaterMark = initial.getLowWaterMark();
this.highWaterMark = initial.getHighWaterMark();
}
/** Resets to the initial state. It is guaranteed that following changes occur
* to the statistic if this method is called:
* <ul>
* <li> The current value is reset to initial value. </li>
* <li> The lastSampleTime is reset to <b> current time in milliseconds. </b> </li>
* <li> The startTime is reset to lastSampleTime. </li>
* <li> The highWaterMark is reset to the initial value. </li>
* <li> The lowWaterMark is reset to the initial value. </li>
* </ul>
* The remaining meta data in the encapsulated statistic is unchanged. The
* upper and lower bounds are untouched.
*/
public void reset() {
this.current = initial.getCurrent();
this.lastSampleTime = System.currentTimeMillis();
this.startTime = this.lastSampleTime;
this.highWaterMark = initial.getHighWaterMark();
this.lowWaterMark = initial.getLowWaterMark();
}
/** Changes the current value of the encapsulated BoundedRangeStatistic to the given value.
* Since this is the only mutator exposed here, here are the other side effects
* of calling this method:
* <ul>
* <li> lastSampleTime is set to <b> current time in milliseconds. </b> </li>
* <li> highWaterMark is accordingly adjusted. </li>
* <li> lowWaterMark is accordingly adjusted. </li>
* </ul>
* In a real-time system with actual probes for measurement, the lastSampleTime
* could be different from the instant when this method is called, but that is deemed insignificant.
* @param count long that represents the current value of the Statistic.
*/
public void setCount(long current) {
this.current = current;
this.lastSampleTime = System.currentTimeMillis();
this.lowWaterMark = (current < this.lowWaterMark) ? (current) : (this.lowWaterMark);
this.highWaterMark = (current > this.highWaterMark) ? (current) : (this.highWaterMark);
this.lastSampleTime = System.currentTimeMillis();
}
/** This method is the essence of this class. It provides the read-only view of encapsulated
* Statistic. If the clients have to know the Statistic, this is what should
* be called by actual data collecting component to return the value to them.
* The principle advantage is from the data collecting component's standpoint, in
* that it does not have to create instances of BoundedRangeStatistic when its
* current value is queried/measured.
* @see #reset
* @see #setCount
* @return instance of BoundedRangeStatistic
*/
public Statistic unmodifiableView() {
return ( new BoundedRangeStatisticImpl(
this.current, // this is the actual changing statistic
this.highWaterMark, // highWaterMark may change per current
this.lowWaterMark, // lowWaterMark may change per current
initial.getUpperBound(), // upperBound is not designed to change
initial.getLowerBound(), // lowerBound is not designed to change
initial.getName(), // name does not change
initial.getUnit(), // unit does not change
initial.getDescription(), // description does not change
this.startTime, // changes if reset is called earlier
this.lastSampleTime // changes all the time!
));
}
public String getDescription() {
return ( initial.getDescription());
}
public long getLastSampleTime() {
return ( this.lastSampleTime );
}
public String getName() {
return ( initial.getName() );
}
public long getStartTime() {
return ( initial.getStartTime() );
}
public String getUnit() {
return ( initial.getUnit() );
}
public Statistic modifiableView() {
return ( this );
}
public long getCurrent() {
return ( this.current );
}
public long getHighWaterMark() {
return ( this.highWaterMark );
}
public long getLowWaterMark() {
return ( this.lowWaterMark );
}
public long getLowerBound() {
return ( initial.getLowerBound() );
}
public long getUpperBound() {
return ( initial.getUpperBound() );
}
/* hack: bug 5045413 */
public void setDescription (final String s) {
try {
((StatisticImpl)this.initial).setDescription(s);
}
catch(final Exception e) {
}
}
}
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