JOAFIP java data object persistence in file

Custom Search

what is joafip:

A java library to manage java data object persistence in file system transparently without using database, do not need to manage the field-by-field storage and retrieval to and from the file.

• easy to use

• guarantees all ACID properties

• object oriented, write your model, populate with object and store it. Do not need query language, just navigate in your model (getter call).

• multi data access session ( multi-Thread, transactional data store )

• save all objects of object graph starting from a root object to file system, one heap file data record by instance

• lazy loading of object:

  • make able to not waste memory with large object graph when only need to access to some of them.

  • manage more object than memory can contains

    • about proxy for lazy load

• manage enum state persistence

• crash safe, may accept JVM stop at any time even if write in file ( only the last commit is lost)

• file corruption detection

• garbage collector for file data record that will never be accessed

• The object that can be persisted are POJO that not needs to implement Serializable, but there is some conditions

• Possibility to store serialization of  instance of class in one data record. can be compressed or not

BACK

Why would I use joafip ? (and should not)

• manage collection of object so huge that can not be fully stored in memory

• have an embedded persistence, no backend database to be used

• develop your data model with collection in memory, and then make data persist without intrusion  in your data model code
  ( some little intrusion see conditions )

• do not need to access to a database

• retrieving object by navigation is enough

• do not need to retreive object with complex criteria (versus object request)

BACK

Projects:

used by joafip:

Open source projects used by joafip:

• asm ( embedded since release 2.0.0 ) to create proxy for lazy load instead of cglib

• cglib ( no longer used since release 2.0.0 ) is a powerful, high performance and quality Code Generation Library, It is used to extend JAVA classes and implements interfaces at run-time.

  • about proxy for lazy load

• log4j to manage technical logging

BACK

using joafip

• used in Store Electronic Systems application that had trigger the project joafip, since November 2008
  
  



• used by UMR 7102 equipe ENMVI of CNRS in application making calculation of behavioral parameters on data derived from experiments in rodents.
  
  
  

BACK

License:

Open source project, use in commercial application allowed.

JOAFIP is licensed under the GNU LESSER GENERAL PUBLIC LICENSE

BACK

Development status:

sourceforge home page:

http://sourceforge.net/projects/joafip

Get version

FilePersistence.getVersion

Special thanks to

• Jean-Marc Vanel : who inspired me the concept of JOAFIP, help me to correct and enhance the documentation, and gives me some feature to add.

• Patrick duclos : who had be, and is, helpful for debugging.

• François Xavier Gendrin : to be helpful with some idea

BACK

Atoutsweb, services pour webmaster