JpaPersistenceContextManager (Drools :: Persistence :: JPA 7.66.0.Final API)

java.lang.Object
- org.drools.persistence.jpa.AbstractPersistenceContextManager
- - org.drools.persistence.jpa.JpaPersistenceContextManager

All Implemented Interfaces:

org.drools.persistence.api.PersistenceContextManager
```
public class JpaPersistenceContextManager
extends AbstractPersistenceContextManager
implements org.drools.persistence.api.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.

Field Summary
- Fields inherited from class org.drools.persistence.jpa.AbstractPersistenceContextManager
  appScopedEntityManager, cmdScopedEntityManager, emf, env, internalAppScopedEntityManagerFlag, internalCmdScopedEntityManagerFlag, txm

Constructor Summary

Constructors
Constructor Description

JpaPersistenceContextManager(org.kie.api.runtime.Environment env)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`beginCommandScopedEntityManager()`
`org.drools.persistence.api.PersistenceContext`	`getApplicationScopedPersistenceContext()`
`org.drools.persistence.api.PersistenceContext`	`getCommandScopedPersistenceContext()`

Methods inherited from class org.drools.persistence.jpa.AbstractPersistenceContextManager
dispose, endCommandScopedEntityManager, getApplicationScopedEntityManager, getCommandScopedEntityManager, getInternalCommandScopedEntityManager, resetApplicationScopedPersistenceContext

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.drools.persistence.api.PersistenceContextManager
dispose, endCommandScopedEntityManager, resetApplicationScopedPersistenceContext

- Constructor Detail
  - JpaPersistenceContextManager
```
public JpaPersistenceContextManager(org.kie.api.runtime.Environment env)
```
- Method Detail
  - getApplicationScopedPersistenceContext
```
public org.drools.persistence.api.PersistenceContext getApplicationScopedPersistenceContext()
```
    Specified by:
    
    getApplicationScopedPersistenceContext in interface org.drools.persistence.api.PersistenceContextManager
  - getCommandScopedPersistenceContext
```
public org.drools.persistence.api.PersistenceContext getCommandScopedPersistenceContext()
```
    Specified by:
    
    getCommandScopedPersistenceContext in interface org.drools.persistence.api.PersistenceContextManager
  - beginCommandScopedEntityManager
```
public void beginCommandScopedEntityManager()
```
    Specified by:
    
    beginCommandScopedEntityManager in interface org.drools.persistence.api.PersistenceContextManager