The Portable Object Adapter (POA)

• Provides object creation, servant registration and mapping, request dispatching
• Intended for scalable, high-performance applications
– different POAs for 1 object or millions of objects
• Is a locally-constrained object, multiple may exist
• Policies

– Object life span: persistent/transient
– Object Id: system_ID/user_ID
– Mapping objects to servants: unique_ID/multiple_ID
– Object activation: implicit/no_implicit
– Matching requests to servants: object_map/default_servant/manager
– Object to servant association: retain/non_retain
– allocation of threads: ORB_control/single_thread