/*
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Apr 20, 2008
*/
package com.bigdata.counters;
import com.bigdata.counters.ICounterSet.IInstrumentFactory;
/**
* Used to read in {@link CounterSet} XML, aggregating data into
* {@link HistoryInstrument}s.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public class DefaultInstrumentFactory implements IInstrumentFactory {
/**
* Instance supports overwrite, so the ring buffer will eventually overwrite
* old values as new values arrive. Minutes are migrated onto hours and
* hours are migrated onto days. Up to 30 days of data will be retained.
*/
public static final DefaultInstrumentFactory OVERWRITE_60M = new DefaultInstrumentFactory(
60/* slots */, PeriodEnum.Minutes, true/* overwrite */);
public static final DefaultInstrumentFactory NO_OVERWRITE_60M = new DefaultInstrumentFactory(
60/* slots */, PeriodEnum.Minutes, false/* overwrite */);
private final int nslots;
private final PeriodEnum period;
private final boolean overwrite;
/**
*
* @param nslots
* The #of units of the period to be retained by the
* {@link History}.
* @param period
* The period in which those units are measured.
* @param overwrite
* If the {@link History} may serve as a ring buffer.
*/
public DefaultInstrumentFactory(final int nslots, final PeriodEnum period,
final boolean overwrite) {
if (nslots <= 0)
throw new IllegalArgumentException();
if (period == null)
throw new IllegalArgumentException();
this.nslots = nslots;
this.period = period;
this.overwrite = overwrite;
}
public IInstrument newInstance(final Class type) {
if (type == null)
throw new IllegalArgumentException();
if (type == Double.class || type == Float.class) {
final History<Double> minutes = new History<Double>(
new Double[nslots], period.getPeriodMillis(), overwrite);
if (overwrite) {
// 24 hours in a day
final History<Double> hours = new History<Double>(24, minutes);
// 30 days of history
// final History<Double> days =
new History<Double>(30, hours);
}
return new HistoryInstrument<Double>(minutes);
} else if (type == Long.class || type == Integer.class) {
final History<Long> minutes = new History<Long>(
new Long[nslots], period.getPeriodMillis(), overwrite);
if (overwrite) {
// 24 hours in a day
final History<Long> hours = new History<Long>(24, minutes);
// 30 days of history
// final History<Long> days =
new History<Long>(30, hours);
}
return new HistoryInstrument<Long>(minutes);
} else if (type == String.class) {
return new StringInstrument();
} else {
throw new UnsupportedOperationException("type: " + type);
}
}
static class StringInstrument extends Instrument<String> {
public void sample() {}
};
}