Package org.drools.persistence.jpa

Class JpaPersistenceContextManager

java.lang.Object
org.drools.persistence.jpa.AbstractPersistenceContextManager
org.drools.persistence.jpa.JpaPersistenceContextManager
All Implemented Interfaces:
PersistenceContextManager
public class JpaPersistenceContextManager extends AbstractPersistenceContextManager implements PersistenceContextManager
This class manages JpaPersistenceContext objects, and the underlying persistence context (EntityManager) instances for a persistent KieSession and other infrastructure classes that use persistence in KIE projects.

(For reference in the following documentation: the EntityManager is the class used to represent a persistence context)

There are 2 issues to take into account when looking at or modifying the code here:
  1. One of the features made available here is the ability for the user to supply their own (Command Scoped) persistence context for use by the KieSession
  2. However, significant race-conditions arise when a Command Scoped persistence context is used in one persistent KieSession by multiple threads. In other words, when multiple threads call operations on a Singleton persistent KieSession.
This class uses ThreadLocal instances for two things:
  1. The internal Command Scoped EntityManager instance.