profiler.java

来自「java pos,你可以直接编译运行,」· Java 代码 · 共 116 行

/*
 * Copyright (c) 2000 jPOS.org.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *    "This product includes software developed by the jPOS project 
 *    (http://www.jpos.org/)". Alternately, this acknowledgment may 
 *    appear in the software itself, if and wherever such third-party 
 *    acknowledgments normally appear.
 *
 * 4. The names "jPOS" and "jPOS.org" must not be used to endorse 
 *    or promote products derived from this software without prior 
 *    written permission. For written permission, please contact 
 *    [e-mail].
 *
 * 5. Products derived from this software may not be called "jPOS",
 *    nor may "jPOS" appear in their name, without prior written
 *    permission of the jPOS project.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  
 * IN NO EVENT SHALL THE JPOS PROJECT OR ITS CONTRIBUTORS BE LIABLE FOR 
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the jPOS Project.  For more
 * information please see <http://www.jpos.org/>.
 */

package org.jpos.util;

import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

/**
 * Simple Profiler
 * @author Alejandro P. Revilla
 * @version $Id: Profiler.java,v 1.3 2004/11/03 19:52:41 apr Exp $
 */
public class Profiler implements Loggeable {
    long start, parcial;
    Collection events;
    public Profiler () {
        super();
        reset();
    }
    /**
     * reset timers
     */
    public void reset() {
        start = parcial = System.currentTimeMillis();
        events = new ArrayList();
    }
    /**
     * mark checkpoint
     * @param detail checkpoint information
     */
    public synchronized void checkPoint (String detail) {
        long now = System.currentTimeMillis();
        StringBuffer sb = new StringBuffer (detail);
        sb.append (" [");
        sb.append (Long.toString (now - parcial));
        sb.append ('/');
        sb.append (Long.toString (now - start));
        sb.append (']');
        events.add (sb.toString());
        parcial = now;
    }
    /**
     * @return total elapsed time since last reset
     */
    public long getElapsed() {
        return System.currentTimeMillis() - start;
    }
    /**
     * @return parcial elapsed time since last reset
     */
    public long getParcial() {
        return System.currentTimeMillis() - parcial;
    }
    public void dump (PrintStream p, String indent) {
        String inner = indent + "  ";
        parcial = start;
        checkPoint ("end");
        Iterator iter = events.iterator();
        p.println (indent + "<profiler>");
        while (iter.hasNext()) 
            p.println (inner + (String) iter.next());

        p.println (indent + "</profiler>");
    }
}