2d barcode generator c# free | Appendix F: Java Persistence APIs: Employee Registry Example in Java

Painting Quick Response Code in Java | Appendix F: Java Persistence APIs: Employee Registry Example

638 | Appendix F: Java Persistence APIs: Employee Registry Example
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// Assert events fired final String postconditionMessage = "Missing event fired"; Assert.assertTrue(postconditionMessage, EventTracker.postLoad); Assert.assertTrue(postconditionMessage, EventTracker.postPersist); Assert.assertTrue(postconditionMessage, EventTracker.postRemove); Assert.assertTrue(postconditionMessage, EventTracker.postUpdate); Assert.assertTrue(postconditionMessage, EventTracker.prePersist); Assert.assertTrue(postconditionMessage, EventTracker.preRemove); Assert.assertTrue(postconditionMessage, EventTracker.preUpdate);
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/** * Ensures we may look up an entity by a JPA QL Query * @throws Exception */ @Test public void jpaQlFind() throws Exception { // Create an employee final SimpleEmployee employee = new SimpleEmployee(ID_DAVE, NAME_DAVE); // Persist, then lookup txWrapper.wrapInTx(new Callable<Void>() { @Override public Void call() throws Exception { // Get EM final EntityManager em = emHook.getEntityManager(); // Persist em.persist(employee); // Lookup final String jpaQlQuery = "FROM " + SimpleEmployee.class.getSimple Name() + " e WHERE e.name= 1"; final SimpleEmployee roundtrip = (SimpleEmployee) em.createQuery (jpaQlQuery).setParameter(1, NAME_DAVE) .getSingleResult(); // Test obtained as expected Assert.assertEquals("Employee from JPA QL Query should equal the record added", employee, roundtrip); // Return return null;
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* Ensures we may look up an entity by a Criteria API Query * @throws Exception */ @Test public void criertiaAPIFind() throws Exception { // Create an employee final SimpleEmployee employee = new SimpleEmployee(ID_DAVE, NAME_DAVE); // Persist, then lookup txWrapper.wrapInTx(new Callable<Void>() { @Override public Void call() throws Exception { // Get EM final EntityManager em = emHook.getEntityManager(); // Persist em.persist(employee); // Lookup final CriteriaBuilder builder = em.getCriteriaBuilder(); final CriteriaQuery<SimpleEmployee> query = builder.createQuery (SimpleEmployee.class); Root<SimpleEmployee> root = query.from(SimpleEmployee.class); query.select(root).where(builder.equal(root.get("name"), NAME_DAVE)); final SimpleEmployee roundtrip = (SimpleEmployee) em.createQuery (query).getSingleResult(); // Test obtained as expected Assert.assertEquals("Employee from Criteria API Query should equal the record added", employee, roundtrip); // Return return null;
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//--------------------------------------------------------------------------|| // Internal Helper Methods -------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Issues a JPA QL Update to remove all entities of the specified type * @param type * @param em */ private void deleteAllEntitiesOfType(final Class< > type, final EntityManager {
em)
assert em != null : EntityManager.class.getSimpleName() + " must be specified";
640 | Appendix F: Java Persistence APIs: Employee Registry Example
}
assert type != null : "type to be removed must be specified"; // JPA QL String to remove all of the specified type log.info("Removed: " + em.createQuery("DELETE FROM " + type.getSimpleName() + " o").executeUpdate() + " entities of type " + type); }
APPENDIX G
Security: Secured School Example
Description
Multiuser applications, in order to be secure, must respect that there are differences in user types. For instance, perhaps a system administrator should be given access to alter records hidden to typical users. Coding security logic inside our applications, however, mixes concerns and makes code less maintainable. EJB therefore provides as a service a role-based security model which is both declarative (via metadata) and programmatic (via an API). In this example we model a school with strict policies about who can open the doors when. Here we showcase the use of @RolesAllowed, @DeclareRoles, @RunAs and @PermitAll.
Online Companion Information
Wiki article: http://community.jboss.org/docs/DOC-15571 Source location: http://github.com/jbossejb3/oreilly-ejb-6thedition-book-examples/tree/ master/ch15-secureschool/
Source Listing
Following is a full listing of all source code used in this runnable example.
Implementation Resources
FireDepartmentLocalBusiness.java
package org.jboss.ejb3.examples.ch15.secureschool.api; /** * Represents a fire department capable of declaring
* a state of emergency. Anyone may invoke this support, * and when an alert is raised we'll close the local school. * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $ */ public interface FireDepartmentLocalBusiness { // ---------------------------------------------------------------------------|| // Contracts -----------------------------------------------------------------|| // ---------------------------------------------------------------------------|| /** * Declares a state of emergency, so we must close the local school */ void declareEmergency(); }
SchoolClosedException.java
package org.jboss.ejb3.examples.ch15.secureschool.api; import javax.ejb.ApplicationException; import javax.ejb.EJBAccessException; import org.jboss.ejb3.examples.ch15.secureschool.impl.Roles; /** * Thrown when a user in role other than {@link Roles#ADMIN} * attempts to open the front door to school while it's closed * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $ */ @ApplicationException(rollback = true) // So this isn't wrapped in EJBException public class SchoolClosedException extends EJBAccessException { //--------------------------------------------------------------------------|| // Class Members -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * serialVersionUID */ private static final long serialVersionUID = 1L; //--------------------------------------------------------------------------|| // Constructor -------------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Constructs a new exception */
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