Examples of org.drools.persistence.jpa.JpaPersistenceContextManager

org.drools.persistence.jpa.JpaPersistenceContextManager
This class manages {@link JpaPersistenceContext} objects, and the underlying persistence context ({@link EntityManager}) instances for a persistent {@link KieSession} and other infrastructure classes that use persistence in KIE projects.
(For reference in the following documentation: the {@link 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 {@link KieSession}
2. However, significant race-conditions arise when a Command Scoped persistence context is used in one persistent {@link KieSession} by multiple threads. In other words, when multiple threads call operations on a Singleton persistent {@link KieSession}.
This class uses {@link ThreadLocal} instances for two things:
1. The internal Command Scoped {@link EntityManager} instance.

                try {
                    Class< ? > jpaPersistenceCtxMngrClass = Class.forName( "org.jbpm.persistence.JpaProcessPersistenceContextManager" );
                    Constructor< ? > jpaPersistenceCtxMngrCtor = jpaPersistenceCtxMngrClass.getConstructors()[0];
                    this.jpm = (PersistenceContextManager) jpaPersistenceCtxMngrCtor.newInstance( new Object[]{this.env} );
                } catch ( ClassNotFoundException e ) {
                    this.jpm = new JpaPersistenceContextManager( this.env );
                } catch ( Exception e ) {
                    throw new RuntimeException( "Error creating JpaProcessPersistenceContextManager",
                                                e );
                }
            }

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                try {
                    Class< ? > jpaPersistenceCtxMngrClass = Class.forName( "org.jbpm.persistence.JpaProcessPersistenceContextManager" );
                    Constructor< ? > jpaPersistenceCtxMngrCtor = jpaPersistenceCtxMngrClass.getConstructors()[0];
                    this.jpm = (PersistenceContextManager) jpaPersistenceCtxMngrCtor.newInstance( new Object[]{this.env} );
                } catch ( ClassNotFoundException e ) {
                    this.jpm = new JpaPersistenceContextManager( this.env );
                } catch ( Exception e ) {
                    throw new RuntimeException( "Error creating JpaProcessPersistenceContextManager",
                                                e );
                }
            }

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                try {
                    Class< ? > jpaPersistenceCtxMngrClass = Class.forName( "org.jbpm.persistence.JpaProcessPersistenceContextManager" );
                    Constructor< ? > jpaPersistenceCtxMngrCtor = jpaPersistenceCtxMngrClass.getConstructors()[0];
                    this.jpm = (PersistenceContextManager) jpaPersistenceCtxMngrCtor.newInstance( new Object[]{this.env} );
                } catch ( ClassNotFoundException e ) {
                    this.jpm = new JpaPersistenceContextManager( this.env );
                } catch ( Exception e ) {
                    throw new RuntimeException( "Error creating JpaProcessPersistenceContextManager",
                                                e );
                }
            }

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        Environment env = createEnvironment(context);
        KnowledgeBase kbase = initializeKnowledgeBase(simpleRule);
        StatefulKnowledgeSession commandKSession = JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, env );
        commandKSession.getId(); // initialize CSEM
        SingleSessionCommandService commandService = (SingleSessionCommandService) ((CommandBasedStatefulKnowledgeSession) commandKSession).getCommandService();
        JpaPersistenceContextManager jpm = (JpaPersistenceContextManager) getValueOfField("jpm", commandService);
        
        TransactionTestObject mainObject = new TransactionTestObject();
        mainObject.setName("mainCommand");
        TransactionTestObject subObject = new TransactionTestObject();
        subObject.setName("subCommand");
        mainObject.setSubObject(subObject);


        UserTransaction ut = InitialContext.doLookup("java:comp/UserTransaction");
        ut.begin();
        HashMap<String, Object> emEnv = new HashMap<String, Object>();
        emEnv.put(COMMAND_ENTITY_MANAGER_FACTORY, emf);
        emEnv.put(COMMAND_ENTITY_MANAGER, jpm.getCommandScopedEntityManager());
        
        TransactionTestCommand txTestCmd = new TransactionTestCommand(mainObject, subObject, emEnv);
        
        commandKSession.execute(txTestCmd);

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                try {
                    Class< ? > jpaPersistenceCtxMngrClass = Class.forName( "org.jbpm.persistence.JpaProcessPersistenceContextManager" );
                    Constructor< ? > jpaPersistenceCtxMngrCtor = jpaPersistenceCtxMngrClass.getConstructors()[0];
                    this.jpm = (PersistenceContextManager) jpaPersistenceCtxMngrCtor.newInstance( new Object[]{this.env} );
                } catch ( ClassNotFoundException e ) {
                    this.jpm = new JpaPersistenceContextManager( this.env );
                } catch ( Exception e ) {
                    throw new RuntimeException( "Error creating JpaProcessPersistenceContextManager",
                                                e );
                }
            }

View Full Code Here

                try {
                    Class< ? > jpaPersistenceCtxMngrClass = Class.forName( "org.jbpm.persistence.JpaProcessPersistenceContextManager" );
                    Constructor< ? > jpaPersistenceCtxMngrCtor = jpaPersistenceCtxMngrClass.getConstructors()[0];
                    this.jpm = (PersistenceContextManager) jpaPersistenceCtxMngrCtor.newInstance( new Object[]{this.env} );
                } catch ( ClassNotFoundException e ) {
                    this.jpm = new JpaPersistenceContextManager( this.env );
                } catch ( Exception e ) {
                    throw new RuntimeException( "Error creating JpaProcessPersistenceContextManager",
                                                e );
                }
            }

View Full Code Here

                try {
                    Class< ? > jpaPersistenceCtxMngrClass = Class.forName( "org.jbpm.persistence.JpaProcessPersistenceContextManager" );
                    Constructor< ? > jpaPersistenceCtxMngrCtor = jpaPersistenceCtxMngrClass.getConstructors()[0];
                    this.jpm = (PersistenceContextManager) jpaPersistenceCtxMngrCtor.newInstance( new Object[]{this.env} );
                } catch ( ClassNotFoundException e ) {
                    this.jpm = new JpaPersistenceContextManager( this.env );
                } catch ( Exception e ) {
                    throw new RuntimeException( "Error creating JpaProcessPersistenceContextManager",
                                                e );
                }
            }

View Full Code Here

                try {
                    Class<?> jpaPersistenceCtxMngrClass = Class.forName( "org.jbpm.persistence.JpaProcessPersistenceContextManager" );
                    Constructor<?> jpaPersistenceCtxMngrCtor = jpaPersistenceCtxMngrClass.getConstructors()[0];
                    this.jpm =  ( PersistenceContextManager) jpaPersistenceCtxMngrCtor.newInstance( new Object[] { this.env } );
                } catch ( ClassNotFoundException e ) {
                    this.jpm = new JpaPersistenceContextManager(this.env);
                } catch ( Exception e ) {
                    throw new RuntimeException("Error creating JpaProcessPersistenceContextManager", e);
                }
            }
            env.set( EnvironmentName.PERSISTENCE_CONTEXT_MANAGER, this.jpm );

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                try {
                    Class< ? > jpaPersistenceCtxMngrClass = Class.forName( "org.jbpm.persistence.JpaProcessPersistenceContextManager" );
                    Constructor< ? > jpaPersistenceCtxMngrCtor = jpaPersistenceCtxMngrClass.getConstructors()[0];
                    this.jpm = (PersistenceContextManager) jpaPersistenceCtxMngrCtor.newInstance( new Object[]{this.env} );
                } catch ( ClassNotFoundException e ) {
                    this.jpm = new JpaPersistenceContextManager( this.env );
                } catch ( Exception e ) {
                    throw new RuntimeException( "Error creating JpaProcessPersistenceContextManager",
                                                e );
                }
            }

View Full Code Here

                try {
                    Class< ? > jpaPersistenceCtxMngrClass = Class.forName( "org.jbpm.persistence.JpaProcessPersistenceContextManager" );
                    Constructor< ? > jpaPersistenceCtxMngrCtor = jpaPersistenceCtxMngrClass.getConstructors()[0];
                    this.jpm = (PersistenceContextManager) jpaPersistenceCtxMngrCtor.newInstance( new Object[]{this.env} );
                } catch ( ClassNotFoundException e ) {
                    this.jpm = new JpaPersistenceContextManager( this.env );
                } catch ( Exception e ) {
                    throw new RuntimeException( "Error creating JpaProcessPersistenceContextManager",
                                                e );
                }
            }

View Full Code Here

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