test/perf/src/org/apache/xmlbeans/test/performance/xerces/MaxMemUntypedBisLoadXercesDom.java

/*   Copyright 2004 The Apache Software Foundation
*
*   Licensed under the Apache License, Version 2.0 (the "License");
*   you may not use this file except in compliance with the License.
*   You may obtain a copy of the License at
*
*       http://www.apache.org/licenses/LICENSE-2.0
*
*   Unless required by applicable law or agreed to in writing, software
*   distributed under the License is distributed on an "AS IS" BASIS,
*   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*   See the License for the specific language governing permissions and
*  limitations under the License.
*/
package org.apache.xmlbeans.test.performance.xerces;

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.xmlbeans.test.performance.utils.Constants;
import org.apache.xmlbeans.test.performance.utils.PerfUtil;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;


public class MaxMemUntypedBisLoadXercesDom
{
 
  public static void main(String[] args) throws Exception
  {
  	int interval = Constants.MEM_INTERVAL;
  	long memory = Runtime.getRuntime().maxMemory();
  	int size = 0;
  	int hash = 0;
    String flavor = null;

    if(args.length == 0)
      flavor = "deep-attributes";
    else
      flavor = args[0];

    MaxMemUntypedBisLoadXercesDom test = new MaxMemUntypedBisLoadXercesDom();
    PerfUtil util = new PerfUtil();
    
    try
    {
    	System.gc();
    	// infinite for loop - go until get oom
    	for(int i=1; true; i++)
    	{
    		System.gc();
    		byte[] bytes = util.createXmlDataBytes(flavor,Constants.MEM_INITIALSIZE+(interval*i));
    		hash += test.run(new BufferedInputStream(new ByteArrayInputStream(bytes)));
    		size = bytes.length;
    	}
    }
    catch (OutOfMemoryError oom)
    {
    	System.gc();
        // Class.getSimpleName() is only provided in jdk1.5, so have to trim package name off test name for logging to support 1.4
        System.out.print(Constants.DELIM+test.getClass().getName().substring(test.getClass().getName().lastIndexOf('.')+1)+" flavor="+flavor+" ");
        System.out.print("hash "+hash+" ");
        System.out.print("memory "+memory+" ");
        System.out.println("size="+size);
    }
  }

  private int run(BufferedInputStream p_bis) throws Exception
  {
    // create the input source from the bis
    InputSource is = new InputSource(p_bis);

    // load the input source
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document doc = builder.parse(is);

    // calculate and return the hash
    return doc.getDocumentElement().getTagName().length() * 17; 	
  }
}