rrdlastcmd.java

jrobin,使用纯java实现的RRD数据库,使用RRD数据库来统计数据.

/* ============================================================
 * JRobin : Pure java implementation of RRDTool's functionality
 * ============================================================
 *
 * Project Info:  http://www.jrobin.org
 * Project Lead:  Sasa Markovic ([e-mail]);
 *
 * (C) Copyright 2003-2005, by Sasa Markovic.
 *
 * Developers:    Sasa Markovic ([e-mail])
 *
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 */

package org.jrobin.cmd;

import org.jrobin.core.RrdDb;
import org.jrobin.core.RrdException;

import java.io.IOException;

class RrdLastCmd extends RrdToolCmd {

	String getCmdType() {
		return "last";
	}

	Object execute() throws RrdException, IOException {
		String[] words = getRemainingWords();
		if (words.length != 2) {
			throw new RrdException("Invalid rrdlast syntax");
		}
		String path = words[1];
		RrdDb rrdDb = getRrdDbReference(path);
		try {
			long lastUpdateTime = rrdDb.getLastUpdateTime();
			println(lastUpdateTime + "");
			return lastUpdateTime;
		}
		finally {
			releaseRrdDbReference(rrdDb);
		}
	}
}