package org.drools.persistence.session;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import org.drools.runtime.Environment;
import org.drools.runtime.EnvironmentName;
public class DefaultJpaManager
implements
JpaManager {
Environment env;
private EntityManagerFactory emf;
private EntityManager appScopedEntityManager;
private EntityManager cmdScopedEntityManager;
private boolean internalAppScopedEntityManager;
private boolean internalCmdScopedEntityManager;
public DefaultJpaManager(Environment env) {
this.env = env;
this.emf = ( EntityManagerFactory ) env.get( EnvironmentName.ENTITY_MANAGER_FACTORY );
}
public EntityManager getApplicationScopedEntityManager() {
if ( this.appScopedEntityManager == null ) {
// Use the App scoped EntityManager if the user has provided it, and it is open.
this.appScopedEntityManager = (EntityManager) this.env.get( EnvironmentName.APP_SCOPED_ENTITY_MANAGER );
if ( this.appScopedEntityManager != null && !this.appScopedEntityManager.isOpen() ) {
throw new RuntimeException("Provided APP_SCOPED_ENTITY_MANAGER is not open");
}
if ( this.appScopedEntityManager == null ) {
internalAppScopedEntityManager = true;
this.appScopedEntityManager = this.emf.createEntityManager();
this.env.set( EnvironmentName.APP_SCOPED_ENTITY_MANAGER,
this.appScopedEntityManager );
} else {
internalAppScopedEntityManager = false;
}
}
return appScopedEntityManager;
}
public EntityManager getCommandScopedEntityManager() {
return this.cmdScopedEntityManager;
}
public void beginCommandScopedEntityManager() {
EntityManager cmdScopedEntityManager = (EntityManager) env.get( EnvironmentName.CMD_SCOPED_ENTITY_MANAGER );
if ( cmdScopedEntityManager == null || !cmdScopedEntityManager.isOpen() ) {
internalCmdScopedEntityManager = true;
cmdScopedEntityManager = this.emf.createEntityManager(); // no need to call joinTransaction as it will do so if one already exists
this.env.set( EnvironmentName.CMD_SCOPED_ENTITY_MANAGER,
cmdScopedEntityManager );
} else {
internalCmdScopedEntityManager = false;
}
cmdScopedEntityManager.joinTransaction();
appScopedEntityManager.joinTransaction();
}
public void endCommandScopedEntityManager() {
if ( this.internalCmdScopedEntityManager ) {
this.env.set( EnvironmentName.CMD_SCOPED_ENTITY_MANAGER,
null );
}
}
public void dispose() {
if ( this.internalAppScopedEntityManager ) {
if ( this.appScopedEntityManager != null && this.appScopedEntityManager.isOpen() ) {
this.appScopedEntityManager.close();
}
this.internalAppScopedEntityManager = false;
this.env.set( EnvironmentName.APP_SCOPED_ENTITY_MANAGER, null );
}
if ( this.internalCmdScopedEntityManager ) {
if ( this.cmdScopedEntityManager != null && this.cmdScopedEntityManager.isOpen() ) {
this.cmdScopedEntityManager.close();
}
this.internalCmdScopedEntityManager = false;
this.env.set( EnvironmentName.CMD_SCOPED_ENTITY_MANAGER, null );
}
}
}