oracle.jbo.pcoll (Oracle Fusion Middleware Java API Reference for Oracle ADF Model)

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Oracle Fusion Middleware Java API Reference for Oracle ADF Model
11g Release 1 (11.1.1)
E10653-03

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Package oracle.jbo.pcoll

Contains a facility to store collections of temporary data.

See:
Description

Interface Summary
PCollListener
PCollManagerHelper
PCollPersistable
PersistManager

Class Summary
JDBCPersistManager
JTAPersistManager
OraclePersistManager
PCollection
PCollInputStream
PCollKeyInfo
PCollManager
PCollNode
PCollOutputStream
PersistentMarker

Package oracle.jbo.pcoll Description

Contains a facility to store collections of temporary data. Alongside its core object/relational persistence feature for entity objects, BC4J has a facility to store collections of temporary data. This persistent collections facility (PCOLL) is used by the BC4J framework to temporarily store :

Pending changes in application modules.
This allows the pending changes in an application module to be logically retained without physically dedicating an application module instance to each client.
Overflow query result rows when a users scrolls through very large result sets.
This insures that the application does not run out of memory when an a misguided user query returns too many rows and they decide to scroll through them all. Instead the extra rows "spill-over" into a temporary persistent store without using real-memory.

In order to manage this pending state, BC4J creates a set of tables that hold the temporary information in BLOB values.