JpaService.java 文件源码

@Override
public ResourceReferenceFactory<EntityManager> registerPersistenceContextInjectionPoint
        (InjectionPoint injectionPoint) {

    PersistenceUnitHolder holder = PersistenceUnitHolder.getInstance();

    PersistenceContext pc = injectionPoint.getAnnotated().getAnnotation(PersistenceContext
            .class);
    String unitName = pc.unitName();

    if (unitName.isEmpty()) {

        unitName = holder.getDefaultUnitName();

        if (unitName.isEmpty()) {
            throw new NoDefaultPersistenceUnit();
        }
    }

    PersistenceWrapper wrapper = holder.getEntityManagerFactory(unitName);

    return new PersistenceContextResourceFactory(unitName, wrapper.getEntityManagerFactory(),
            wrapper.getTransactionType(), pc.synchronization());
}