01 /*
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39 */
40
41 package examples.jpa.jpa22.util;
42
43 import examples.jpa.jpa22.entity.Employee;
44
45 import javax.ejb.Stateless;
46 import javax.persistence.EntityManager;
47 import javax.persistence.PersistenceContext;
48 import javax.persistence.SynchronizationType;
49 import javax.persistence.criteria.CriteriaQuery;
50 import java.util.List;
51 import java.util.stream.Collectors;
52 import java.util.stream.Stream;
53
54 @Stateless
55 public class EmployeeService {
56 /**
57 * Unsynchronized Persistence Context.
58 */
59 @PersistenceContext(synchronization = SynchronizationType.UNSYNCHRONIZED, unitName = "serviceUnit")
60 private EntityManager entityManager;
61
62 /**
63 * Join Transaction.
64 */
65 public void doCreate(Employee p) {
66 entityManager.joinTransaction();
67 entityManager.persist(p);
68 }
69
70 public List<Employee> findAll() {
71 CriteriaQuery criteriaQuery = entityManager.getCriteriaBuilder().createQuery();
72 criteriaQuery.select(criteriaQuery.from(Employee.class));
73 Stream<Employee> personStream = entityManager.createQuery(criteriaQuery).getResultStream();
74 List<Employee> employees = personStream.collect(Collectors.toList());
75 return employees;
76 }
77 }
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