[HARMONY-6664] [classlib][beans] Poor performance of java.beans.XMLEncoder.writeObject() method

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 5.0M15
• Fix Version/s: 6.0M4
• Component/s: Classlib
• Estimated Complexity: Moderate
• Assignee: Kevin Zhou
• Reporter: Kevin Zhou
• Due: 30/Sep/10
• Created: 28/Sep/10 06:45
• Updated: 30/Sep/10 21:54
• Resolved: 29/Sep/10 08:11

Description

Given a test case [1], the performance of java.beans.XMLEncoder.writeObject() is very poor.
**************INDEX=5****************************
writing 5000 of integers encode time:2025 flush time:40
writing 10000 of integers encode time:6242 flush time:87
writing 15000 of integers encode time:12464 flush time:137
writing 20000 of integers encode time:21949 flush time:166
writing 25000 of integers encode time:32119 flush time:219

For writing a list of 25000 integers, XMLEncoder.writeObject() takes about half a minute.

[1] Performance test case:

public class XMLEncoderWriteObjectPerfTest {

public static List<Integer> integerListOf(int length) {
List<Integer> integerList = new ArrayList<Integer>();
for (int index = 0; index < length; index++)

{ integerList.add(index); }

return integerList;
}

public static void timeOfXMLEncoder(int length)

{ ByteArrayOutputStream baos = new ByteArrayOutputStream(); XMLEncoder xmlEncoder = new XMLEncoder(baos); System.out.print("writing " + length + " of integers\t"); Object obj = integerListOf(length); long start = System.currentTimeMillis(); xmlEncoder.writeObject(obj); System.out.print("encode time:" + (System.currentTimeMillis() - start)); start = System.currentTimeMillis(); xmlEncoder.close(); System.out.println("\tflush time:" + (System.currentTimeMillis() - start)); }

public static void main(String[] args) {
for (int index = 0; index < 10; index++)

{ System.out.println("*****INDEX=" + index + "*****"); timeOfXMLEncoder(5000); timeOfXMLEncoder(10000); timeOfXMLEncoder(15000); timeOfXMLEncoder(20000); timeOfXMLEncoder(25000); }

}
}