This week's book giveaway is in the JavaScript forum.
We're giving away four copies of Svelte and Sapper in Action and have Mark Volkmann on-line!
See this thread for details.
Win a copy of Svelte and Sapper in Action this week in the JavaScript forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Ron McLeod
  • Paul Clapham
  • Bear Bibeault
  • Junilu Lacar
Sheriffs:
  • Jeanne Boyarsky
  • Tim Cooke
  • Henry Wong
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Tim Holloway
  • salvin francis
  • Frits Walraven
Bartenders:
  • Scott Selikoff
  • Piet Souris
  • Carey Brown

Quickest way to create objects from XML....

 
Ranch Hand
Posts: 121
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I am storing the persistent state of thousands of objects for an application in XML. I need to know which of the following 2 methods ould be the fast way to create the objects in memory from the xml representations:

Method #1: Each object is represented in a separate XML text file. The application searches for the object representation based on the name of the XML file. It finds the correct XML file, opens a stream to that file, reads the content, and creates the object in memory using the info in the XML file.

Method #2: Objects are grouped together in a single, massive XML file. Each object is represented by a node or element in the XML file, and each node or element is uniquely identified. The application uses a pull XML parser the read through the file until it reaches the desired node, and uses the information in this node to create the object in memory.

Thanks,

Landon
[ July 06, 2005: Message edited by: Landon Blake ]
 
Bartender
Posts: 9615
16
Mac OS X Linux Windows
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I'm tempted to say that it would be practical tie, but given that Method #1 doesn't do any parsing (rather slow) until it has the file/object it's looking for and Method #2 would be parsing a large file, I'd guess that Method #1 would be faster, the difference increasing as the number of objects grows.
Disclaimer: Performance depends on a LOT of variables. There's only one way to be sure: Read Java Platform Performance, write both schemes and test, test, test.
Faster still would be to have some sort of in-order index file of the value you are searching on. You could do a binary search of the file using RandomAccessFile. Associated with the index could either a file name or an index into the huge file. Doing a linear search of anything more than a few values will be a big performance drain (see Disclaimer, above).
 
Hey, sticks and stones baby. And maybe a wee mention of my stuff:
Thread Boost feature
https://coderanch.com/t/674455/Thread-Boost-feature
    Bookmark Topic Watch Topic
  • New Topic