Examples of javax.persistence.EntityManager.unwrap()

javax.persistence.EntityManager.unwrap()
Return an object of the specified type to allow access to the provider-specific API. If the provider's EntityManager implementation does not support the specified class, the PersistenceException is thrown. @param cls the class of the object to be returned. This isnormally either the underlying EntityManager implementation class or an interface that it implements. @return an instance of the specified class @throws PersistenceException if the provider does notsupport the call.

            null,
        };
        for (Class<?> c : invalidCasts) {
            try {
                em.getTransaction().begin();
                em.unwrap(c);
                fail("Expected to fail to unwarp with invalid " + c);
            } catch (PersistenceException e) {
                EntityTransaction txn = em.getTransaction();
                assertTrue(txn.getRollbackOnly());
                txn.rollback();

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                    extensionClass = pu.getClassLoader().loadClass(injectionTypeName);
                } catch (ClassNotFoundException e) {
                    throw JpaLogger.ROOT_LOGGER.cannotLoadFromJpa(e, injectionTypeName);
                }
                // get example of target object
                Object targetValueToInject = entityManager.unwrap(extensionClass);


                // build array of classes that proxy will represent.
                Class[] targetInterfaces = targetValueToInject.getClass().getInterfaces();
                Class[] proxyInterfaces = new Class[targetInterfaces.length + 1];  // include extra element for extensionClass
                boolean alreadyHasInterfaceClass = false;

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   * Check if disabling 2LC works as expected
   */
  public String disabled2LCCheck() {
    
    EntityManager em = emfNo2LC.createEntityManager();
    Statistics stats = em.unwrap(Session.class).getSessionFactory().getStatistics();
    stats.clear();
    
    try {
      // check if entities are NOT cached in 2LC
      String names[] = stats.getSecondLevelCacheRegionNames();

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   *  Checking entity 2LC in one EntityManager session
   */
  public String sameSessionCheck(String CACHE_REGION_NAME) {
    
    EntityManager em = emf.createEntityManager();
    Statistics stats = em.unwrap(Session.class).getSessionFactory().getStatistics();
    stats.clear();
    SecondLevelCacheStatistics emp2LCStats = stats.getSecondLevelCacheStatistics(CACHE_REGION_NAME+"Employee");
      
    try{
      // add new entities and check if they are put in 2LC

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   *  Checking entity 2LC in a different EntityManager session
   */
  public String secondSessionCheck(String CACHE_REGION_NAME) {
    
    EntityManager em = emf.createEntityManager();
    Statistics stats = em.unwrap(Session.class).getSessionFactory().getStatistics();
    stats.clear();
    SecondLevelCacheStatistics emp2LCStats = stats.getSecondLevelCacheStatistics(CACHE_REGION_NAME+"Employee");
      
    try{
      // add new entity

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   * Insert 2 entities and put them into the 2LC and then evicts entity cache.
   */
  public String addEntitiesAndEvictAll(String CACHE_REGION_NAME){


    EntityManager em = emf.createEntityManager();
    Statistics stats = em.unwrap(Session.class).getSessionFactory().getStatistics();
    stats.clear();
    SecondLevelCacheStatistics emp2LCStats = stats.getSecondLevelCacheStatistics(CACHE_REGION_NAME+"Employee");
    
    try{
      createEmployee(em, "Jan", "Ostrava", 20);

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   * Checks if entity 2LC is empty.
   */
  public String evictedEntityCacheCheck(String CACHE_REGION_NAME){


    EntityManager em = emf.createEntityManager();
    Statistics stats = em.unwrap(Session.class).getSessionFactory().getStatistics();
    stats.clear();
    SecondLevelCacheStatistics emp2LCStats = stats.getSecondLevelCacheStatistics(CACHE_REGION_NAME+"Employee");
      
    try{  
      assertEquals("Expected no entities stored in the cache"+emp2LCStats, 0, emp2LCStats.getElementCountInMemory());

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   * @param id Employee's id in the query
   */
  public String queryCacheCheck(String id){
    
    EntityManager em = emf.createEntityManager();
    Statistics stats = em.unwrap(Session.class).getSessionFactory().getStatistics();
    stats.clear();


    try{
          // the nextTimestamp from infinispan is "return System.currentTimeMillis() / 100;"
          Thread.sleep(1000);

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    EntityManager em = emf.createEntityManager();
    
    try{
      // this should evict query cache 
      em.unwrap(Session.class).getSessionFactory().getCache().evictDefaultQueryRegion();


    }catch (Exception e) {
      e.printStackTrace();
    }  finally{
      em.close();

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   * @param id Employee's id in the query
   */
  public String queryCacheCheckIfEmpty(String id){
    
    EntityManager em = emf.createEntityManager();
    Statistics stats = em.unwrap(Session.class).getSessionFactory().getStatistics();
    stats.clear();


    try{
          // the nextTimestamp from infinispan is "return System.currentTimeMillis() / 100;"
          Thread.sleep(1000);

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