[JBoss Seam] - Creating and Updating records in single operation: sensible
by markwhiting
Hi
I'm interested to hear people's opinions on the way I've implemented a solution. I'd like to know if there's a cleaner or simpler pattern...
Requirement:
When a user clicks an 'update' button, create a new record in a table and also update an existing record in the same table. The UI page uses <h:inputText/> fields. Application flow:
1. User selects an existing record from a CRUD page and is presented with an edit page for a that record
2. User edits some fields of that record and clicks 'update'
3. A new record must be created, which is a copy of the existing record but with any fields the user changed in step 2 upated with those changes
4. Some non-UI fields of the existing record must be changed and the record then updated in the table (this record must otherwise remain unchanged)
A solution:
Relevant code (abridged for brevity):
i. Edit page extract:
note: This page is rendered after the user selects a record from a different CRUD page.
<h:form>
|
| <s:decorate id="decoration" template="edit.xhtml">
| <h:inputText id="one"
| value="#{myEntityHome.instance.UIProperty}" >
| <a:support event="onblur" reRender="decoration"
| bypassUpdates="true" ajaxSingle="true" />
| </h:inputText>
| </s:decorate>
|
| <h:commandButton id="update" value="Update" action="#{myEntityHome.update}" />
|
| </h:form>
ii. Extended Home component:
note:
a. find() is invoked in step 1 (when the user selects a record on the CRUD page).
b. update() is invoked in step 2 (when the user clicks the update button).
c. Assume MyEntity is a simple EJB Entity with properties corresponding to those referenced below.
| @Name("myEntityHome")
| public class MyEntityHome extends EntityHome<MyEntity>
|
| private MyEntity existingEntity;
| private List<AssociatedEntityList> associatedEntityLists = new ArrayList<AssociatedEntityList>();
|
| @In(create = true)
| EntityManager em;
|
| public List<AssociatedEntityList> getAssociatedEntityLists() {
| return associatedEntityLists;
| }
|
| @Override
| public MyEntity find() {
|
| // Store the contents of the existing entity
| MyEntity myEntity = super.find();
| existingEntity = new MyEntity(myEntity.getId(),
| myEntity.getUIProperty(),
| myEntity.getNonUIProperty(),
| myEntity.getAssociatedEntityLists());
| return myEntity;
| }
|
|
| @Begin(join = true, flushMode = FlushModeType.MANUAL)
| @Override
| @Transactional
| public String update() {
|
| // For step 3
| MyEntity myEntity = createNewEntity();
|
| // For step 4: Refresh the existing entity as the user may have changed
| // some UI fields, which must not be updated in the db
| em.refresh(getInstance());
|
| // For step 4
| getInstance().setNonUIProperty("changed");
|
| entityManager.flush();
| Contexts.removeFromAllContexts("myEntityHome");
| return "createdAndUpdated";
| }
|
|
| private MyEntity createNewEntity() {
|
| MyEntity myEntity = new MyEntity();
|
| // Copy contents of current UI fields into the newly created entity
| myEntity.setUIPropertyOne(getInstance().getUIPropertyOne());
|
| // Copy contents of non-UI fields into the newly created entity
| myEntity.setNonUIPropertyOne(getInstance().getNonUIPropertyOne());
|
| // Copy associated entities into the newly created entity
| for (AssociatedEntityList ael : associatedEntityLists)
| ael.setMyEntity(myEntity);
| myEntity.setAssociatedEntityLists(associatedEntityLists);
|
| return myEntity;
| }
As you can see, I'm using EntityManager refreshing and manual flushing and am having to make a 'clone' (which could be done by implementing Cloneable instead) of the existing entity in createNewEntity().
Any feedback appreciated...
Thanks
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18Â years, 9Â months
[JBoss Seam] - login & logout options
by caye
Hi! I'm a web developer from finland and i have been working with Jboss/Seam for 2 months, so i just decided to join this forum, since i was reading on it everyday :D
My question is the next one, i want to save some statistics about my users when they log in & out into/from the web (like date of login or date of logout, and things like that). For that i create a method that handles the whole process, but my question is how can i call to those methods once the user execute the action of log in or out.
I tried with the pages.xml with this code, but doesnt work:
anonymous wrote : <navigation from-action="#{identity.login}">
|
| <redirect view-id="/home"/>
|
Thanks in advance for the answer, and i hope to help with some post aswell in the future! ;)
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18Â years, 9Â months