Mark, et al. The spec for both serialization and externalization can be downloaded from http://java.sun.com/j2se/1.4/docs/guide/serialization/index.html
The nub of it is that serialization is built in and carries a great deal of meta data whereas externalization is "roll your own" which means that much content can be omitted provided(!!) the sender and receiver have a prior agreement on the content of the structured object. Serialization is designed to handle inheritance and evolution with as much grace as possible. Externalization makes no such commitments -- but one can build them in to whatever degree is appropriate. A properly implemented externalization technique can be designed to go like stink because so much less is encoded and transmitted but it falls upon the developer of the externalization methods to make it deal with changes in class structures. Burton -----Original Message----- From: Mark Womack [mailto:[EMAIL PROTECTED]] Sent: Tuesday, March 26, 2002 12:33 PM To: 'Log4J Developers List' Subject: RE: Serialization performance Ole, what is the difference between Externalizable and Serializable? Can you give some background as to why there is a performance increase? Thanks, -Mark -----Original Message----- From: Ole Dalgaard [mailto:[EMAIL PROTECTED]] Sent: Tuesday, March 26, 2002 1:20 AM To: [EMAIL PROTECTED] Subject: Serialization performance Hi, I was performance testing the SocketAppender and found it too slow and CPU intensive.So I made some changes to LoggingEvent. LoggingEvent is now Externalizable instead of Serializable. This should be compatible with JDK 1.1 as well. My performance measurements give me 30-50% more throughput. BR Ole Dalgaard -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> This message may contain privileged and/or confidential information. If you have received this e-mail in error or are not the intended recipient, you may not use, copy, disseminate or distribute it; do not open any attachments, delete it immediately from your system and notify the sender promptly by e-mail that you have done so. Thank you. -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
