serializationperformancetest.java

jxta_src_2.41b jxta 2.41b 最新版源码 from www.jxta.org

/*
 * $Id: SerializationPerformanceTest.java,v 1.3 2005/11/04 18:41:34 bondolo Exp $
 ********************
 *
 * Copyright (c) 2001 Sun Microsystems, Inc.  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
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * 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 SUN MICROSYSTEMS OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * 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 Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 ********************
 */

package net.jxta.endpoint;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import junit.framework.*;

import net.jxta.document.MimeMediaType;
import net.jxta.endpoint.ByteArrayMessageElement;
import net.jxta.endpoint.MessageElement;
import net.jxta.endpoint.WireFormatMessage;
import net.jxta.endpoint.WireFormatMessageFactory;
import net.jxta.util.DevNullOutputStream;

/**
 *
 * @author mike
 */
public class SerializationPerformanceTest extends TestCase {
    
    private static final MimeMediaType appMsg = new MimeMediaType( "application/x-jxta-msg");
    
    public SerializationPerformanceTest(java.lang.String testName) {
        super(testName);
    }
    
    public static void main(java.lang.String[] args) {
        junit.textui.TestRunner.run(suite());
        
        System.err.flush();
        System.out.flush();
    }
    
    public static Test suite() {
        TestSuite suite = new TestSuite(SerializationPerformanceTest.class);
        return suite;
    }
    
    public void testSerialPerformance() {
        try {
            Message msg = new Message();
            
            WireFormatMessage init = WireFormatMessageFactory.toWire( msg, appMsg, null );
            
            final int startCount = 1;
            final int endCount = 250;
            final int stride = 10;
            final int elementSize = 256;
            final int repeats = 250;
            
            for( int count = 1; count < endCount; count += stride ) {
                
                System.gc();
                System.gc();
                
                MessageElement newElem = new ByteArrayMessageElement( Integer.toString( count ), null, new byte[elementSize], null );
                
                long beforeAdd = System.currentTimeMillis();
                long beforeSerial = 0;
                long atEnd = 0;
                
                for( int repeat = 1; repeat <= repeats; repeat++ ) {
                    msg.addMessageElement( newElem );
                    msg.removeMessageElement( newElem );
                }
                
                msg.addMessageElement( newElem );
                
                if( count >= startCount ) {
                    beforeSerial = System.currentTimeMillis();
                    
                    for( int repeat = 1; repeat <= repeats; repeat++ ) {
                        OutputStream out = new ByteArrayOutputStream();
                        
                        WireFormatMessage serialed = WireFormatMessageFactory.toWire( msg, appMsg, null );
                        
                        serialed.sendToStream( out );
                    }
                }
                
                atEnd = System.currentTimeMillis();
                
                long addCost;
                long serialCost;
                
                if( beforeSerial != 0 ) {
                    addCost = beforeSerial - beforeAdd;
                    serialCost = atEnd - beforeSerial;
                } else {
                    addCost = atEnd - beforeAdd;
                    serialCost = atEnd - atEnd;
                }
                
                System.err.println( count + "," + addCost + "," + serialCost );
            }
        } catch( Throwable caught ) {
            caught.printStackTrace();
            fail( "exception thrown : " + caught.getMessage() );
        }
    }
    
}