162 Patterns: Implementing Self-Service in an SOA Environment
Figure 7-8 Command hierarchy
7.2.8 Best practices for EJBs
The following is a brief collection of best practices for developers of Enterprise
JavaBeans:
Use session beans to represent large-grained tasks in the business process.
Session beans are used by one client and may or may not have associated
properties.
Use entity beans to represent fine-grained business domain elements.
Entity beans are shared by many clients and typically have persistent data.
«JavaInterface»
TargetableCommand
+ getC ommandTarget ( )
+ getC ommandTargetName (
)
+ hasOutputProperties ( )
+ performExecute ( )
+ setC ommandTarget ( )
+ setC ommandTargetName ( )
+ setOutputProperties ( )
TargetableCommandImpl
«JavaInterface»
CompensableCommand
+ getC ompensatingC ommand ( )
«Jav aInterface»
Serializable
«JavaInterface»
Command
+ execute ( )
+ isReadyToCallExecute (
)
+ reset ( )
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