JOAFIP 介绍
JOAFIP (java data object persistence in file ) 使得你可以使用文件系统来保存数据对象，而不是数据库。
主要特点：
- easy to use
- guarantees all ACID properties
- object oriented, write your model, store it. Do not need query language, juste navigate in your model.
- 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 record by object 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 persited 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 compreRSSed or not