Examples of javax.jdo.PersistenceManager.refresh()

javax.jdo.PersistenceManager.refresh()
Refresh the state of the instance from the data store.
In an optimistic transaction, the state of instances in the cache might not match the state in the data store. This method is used to reload the state of the instance from the data store so that a subsequent commit is more likely to succeed.
Outside a transaction, this method will refresh nontransactional state. @param pc the instance to refresh.

      p.setAge(2000);
      p.setAddress(a);
      Person pc = (Person) p.getChildren().iterator().next();
      pc.setAge(3000);
      pc.setAddress(a);
      pm.refresh(parent);
      pm.currentTransaction().commit();


      Person ch = (Person) parent.getChildren().iterator().next();
      assertEquals(40, ch.getAge());
      assertEquals(address.getCity(), ch.getAddress().getCity());

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      pChild.setAge(3000);
      pChild.setAddress(a);
      Person pGrandChild = (Person) pChild.getChildren().iterator().next();
      pGrandChild.setAge(4000);
      pGrandChild.setAddress(a);
      pm.refresh(grandParent);
      pm.currentTransaction().commit();
      
      Person cParent = (Person) grandParent.getChildren().iterator().next();
      assertEquals(70, cParent.getAge());
      assertEquals(address.getCity(), cParent.getAddress().getCity());

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    try{
      pm.currentTransaction().begin();
      String nodeName = (String) n1.getEdges().keySet().iterator().next();
      EdgeWeight ew = (EdgeWeight) n1.getEdges().get(nodeName);
      ew.setWeight(3000);
      pm.refresh(n1);
      pm.currentTransaction().commit();
      assertEquals(2, ew.getWeight());
    } catch(Exception e) {
      if (pm.currentTransaction().isActive())
        pm.currentTransaction().rollback();

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    try {
      pm.currentTransaction().begin();
      String nodeName = (String) n1.getEdges().keySet().iterator().next();
      EdgeWeight ew = (EdgeWeight) n1.getEdges().get(nodeName);
      ew.setWeight(3000);
      pm.refresh(n1);
      pm.currentTransaction().commit();
      assertEquals(3000, ew.getWeight());
    } catch(Exception e) {
      if (pm.currentTransaction().isActive())
        pm.currentTransaction().rollback();

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      pm.currentTransaction().begin();
      //update the age and the address
      parent.setAge(99);
      Address newAddress = new Address("rue Ampere", "Rennes", new Country("bz", "Bretagne")); 
      parent.setAddress(newAddress);
      pm.refresh(parent);  
      pm.currentTransaction().commit();
      assertEquals(32, parent.getAge());
      assertEquals(address.getCity(), parent.getAddress().getCity());
      assertEquals(address.getStreet(), parent.getAddress().getStreet());
    } catch(Exception e) {

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      //update the first child age and address
      Person p = (Person) parent.getChildren().iterator().next();
      p.setAge(2000);
      Address newAddress = new Address("Rue Refresh", "Moon", new Country("m", "mars"));
      p.setAddress(newAddress);
      pm.refresh(parent);
    
      int totalAgeRefreshed = 0;
      Iterator it = parent.getChildren().iterator();
      Person ch = null;
      while (it.hasNext()) {

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      //  update the first child age and address
      Person p = (Person) parent.getChildren().iterator().next();
      p.setAge(2000);
      Address newAddress = new Address("Rue Far", "Moon", new Country("n", "neptune")); 
      p.setAddress(newAddress);
      pm.refresh(parent);
    
      pm.currentTransaction().commit();
      Person ch = (Person) parent.getChildren().iterator().next();
      int expectedAge  = 0;
      if (ch.getName().equals(child1.getName())) {

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      p.setAge(2000);
      p.setAddress(a);
      Person pc = (Person) p.getChildren().iterator().next();
      pc.setAge(3000);
      pc.setAddress(a);
      pm.refresh(parent);
      logger.log(BasicLevel.DEBUG, "Warning: the child of child will not be refreshed.");
      pm.currentTransaction().commit();
      
      Person ch = (Person) parent.getChildren().iterator().next();
      int expectedAge = 0;

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    pm.currentTransaction().begin();
    pm.makePersistent(ba);
        pm.currentTransaction().commit();
        
    pm.currentTransaction().begin();
    pm.refresh(ba);
    int f2 = ba.readF2();
    assertTrue("bad F2 value:" + f2, f2 < 4);
        pm.currentTransaction().commit();
        
    pm.currentTransaction().begin();

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    pm.makePersistent(ba);
        pm.currentTransaction().commit();
        
    pm.currentTransaction().begin();
    ba.writeF2(4);
    pm.refresh(ba);
    int f2 = ba.readF2();
    assertTrue("bad F2 value:" + f2, f2 < 4);
        pm.currentTransaction().commit();
        
    pm.currentTransaction().begin();

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