SOJO基础知识

POJO大家并不陌生，可是SOJO大家知道吗？SOJO英文全称“Simplified Old Java Objects”意即简化你的java对象。SOJO框架的目标是将javaBeans转化为一种简单的表示方式，转换为诸如JSON, XML或者任何易于同非java程式交互的格式。

SOJO通过管理“循环变量”（with cycle detection）来转换和标识复杂的演变的java对象。这个转换设备是可插拔的，所以你可以以自定义的形式实现并使用。

虽然POJOS是如此的重要和有用，可是在有些场景下它必须和非java环境和系统交互，所以POJOS就显得无能为力，这就是SOJO要解决的问题：

• data interchange (interchange): 数据交换
  • JSON (JavaScript Object Notation) a lightweight data-interchange format
  • Object To XML - where is XML-RPC a special case
  • Comma Separated Values (CSV)
  • Java serialization, without implements the interface java.io.Serializable (e.g. cluster, cache, remote communication, ...)
• operation of complex Java-Objects-graphs (common / navigation): 操作具有继承关系和不同版本的java对象
  • copy or clone complex object graph (can manage different versions from one object graph (object history))
  • compare complex object graph
  • walk over object graph (to traverse)
  • extend objects to additional information (e.g.: object-versions (number of changes), data changed date or changed user)
  • easy navigate on the complex object graph (with a navigation language)
  • mapping from one property to other property (name to name mapping (by naming conflicts) or value to value mapping (to convert values))
  • making object-values immutable, for testing concurrent access - multi threading)
• remote acces/communication: 远程访问和交互
  • HTTP protocol - request and response are based on String represantation
  • RMI (Java-Object must serializable (marshalling) or deserializable (unmarshalling))
  • WebService or XML RPC - convert Java-Object in special String represantation, in XML
  • create "value objects" or "transfer objects" to sent objects over the network
• data access: 数据访问
  • object/relational persistence respectively object/relational mapping
  • flat files (convert Java-Object-Graph to a flat represantation)
  • property files (e.g. convert Strings to Long, Date, ... by reading a property file and map the value to setter from a Bean)
  • legacy systems
• GUI interface: gui接口
  • transform business models to GUI-models (DataBinder)
  • every changes on the GUI-model must to notice (integrated PropertyChangeListener or VetoableChangeListener)
• and so on ...

SOJO将会比较简单的解决以上问题。