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Re: Session and thread safety
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created by <a href="https://community.jboss.org/people/calbazasebastian">Sebastian Calbaza</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/760010#760010">View the full discussion</a>
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<div class="jive-rendered-content"><p>Here is my thread safe ProcessPersistenceContextManager if someone needs it. </p><p>It needs to be set on the Environment param (env.set(EnvironmentName.PERSISTENCE_CONTEXT_MANAGER, persistenceContextManager);) before you  pass it to JPAKnowledgeService.newStatefulKnowledgeSession(kbase,null, env)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>-----------------------------------------</p><p>public class MyJpaProcessPersistenceContextManager implements</p><p>        ProcessPersistenceContextManager, PersistenceContextManager {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    private EntityManagerFactory emf;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    private ThreadLocal<EntityManager> appScopedEntityManager=new ThreadLocal<EntityManager>();</p><p>    protected ThreadLocal<EntityManager> cmdScopedEntityManager=new ThreadLocal<EntityManager>();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public ProcessPersistenceContext getProcessPersistenceContext() {</p><p>        return new JpaProcessPersistenceContext(cmdScopedEntityManager.get());</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public MyJpaProcessPersistenceContextManager(Environment env) {</p><p>        this.emf = (EntityManagerFactory) env.get(EnvironmentName.ENTITY_MANAGER_FACTORY);</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public PersistenceContext getApplicationScopedPersistenceContext() {</p><p>        if (this.appScopedEntityManager.get() == null) {</p><p>                this.appScopedEntityManager.set(this.emf.createEntityManager());</p><p>        }</p><p>        return new JpaPersistenceContext(appScopedEntityManager.get());</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public PersistenceContext getCommandScopedPersistenceContext() {</p><p>        return new JpaPersistenceContext(this.cmdScopedEntityManager.get());</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void beginCommandScopedEntityManager() {</p><p>        if (cmdScopedEntityManager.get() == null ||</p><p>                (this.cmdScopedEntityManager.get() != null && !this.cmdScopedEntityManager.get().isOpen())) {</p><p>            this.cmdScopedEntityManager.set( this.emf.createEntityManager());</p><p>        }</p><p>        cmdScopedEntityManager.get().joinTransaction();</p><p>        appScopedEntityManager.get().joinTransaction();</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void endCommandScopedEntityManager() {</p><p>        if (this.cmdScopedEntityManager.get()!=null){</p><p>            this.cmdScopedEntityManager.get().flush();</p><p>            this.cmdScopedEntityManager.get().close();</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public ThreadLocal<EntityManager> getCmdScopedEntityManager() {</p><p>        return cmdScopedEntityManager;</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public ThreadLocal<EntityManager> getAppScopedEntityManager() {</p><p>        return appScopedEntityManager;</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void dispose() {</p><p>            if (this.appScopedEntityManager.get() != null && this.appScopedEntityManager.get().isOpen()) {</p><p>                this.appScopedEntityManager.get().flush();</p><p>                this.appScopedEntityManager.get().close();</p><p>            }</p><p>            this.appScopedEntityManager.set(null);</p><p>            if (this.cmdScopedEntityManager.get() != null && this.cmdScopedEntityManager.get().isOpen()) {</p><p>                this.cmdScopedEntityManager.get().flush();</p><p>                this.cmdScopedEntityManager.get().close();</p><p>            }</p><p>            this.cmdScopedEntityManager.set(null);</p><p>    }</p><p>}</p></div>
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