[jboss-user] [JBoss Seam] - New to seam: How to choose proper context and achieve extern

[mmakundi]

Hi!

Here is what I am trying to do:
1. I need a page that loads its dataTable contents from db fresh every time I access the page.
2. The items in the dataTable need to be clickable and bookmarkable in the future; this is why s:link was chosen. According to my experience, @Scope(PAGE) does not cut it with <s:link> elements, as the parameters are passed on as null.
3. My business items allow clicking a link, but instead of directly linking the user to the external url I want to record the click-count first. So intuitively I thought I could just return the url from the click-counting action.

The solutions I have tried are the following:
1. Page scope seems to have the right idea: the dataTable contents are refreshed from db each time the page is refreshed. However, page context seem to have problems with requirement 2 -- or am I doing something else wrong?
2. If I use Session scope, the <s:link> works fine and passes the actual objects as parameters to the desired method recordLinkClickAndRedirect(). However, with Session scope the dataTable does not get fresh data in a new page-refresh, because the session is still alive. I can actually make this happen by binding the @Destroy and @Remove annotations to my recordLinkClickAndRedirect() method, but it seams like a hack and I would rather not do that if there is a better way.
3. I have not found a way to redirect from within my recordLinkClickAndRedirect() method, but intuitively it seems like there should be a way as this is how navigation can normally be affected.

Here are my code snipplets:

::: from items.xhtml

	<!-- content -->
	<ui:define name="content">

		
		<h1>Latest business items</h1>

		<h:outputText value="No items found on this round. Please refresh page to check again!"
			rendered="#{businessItems == null or businessItems.rowCount==0}" />
		<h:dataTable var="businessItem" value="#{businessItems}"
			rendered="#{businessItems.rowCount>0}">
			<h:column>
			#{businessItem.description}
				<s:link value="#{businessItem.externalLinkURL}"
					action="#{itemViewer.recordLinkClickAndRedirect(businessItem)}" />
			</h:column>
		</h:dataTable>

	</ui:define>

::: from ItemViewer.java

@Stateless
@Scope(ScopeType.PAGE)
@Name("itemViewer")
public class ItemViewer implements LocalInterface {
  @PersistenceContext
  private EntityManager entityManager;

  @DataModel
  @SuppressWarnings("unused")
  private List businessItems;

  /**
   * This method TODO
   * 
   */
  @Factory("businessItems")
  @SuppressWarnings("unchecked")
  public void getFreshBusinessItems() {
    businessItems = (List) entityManager
        .createQuery("select b from businessItem b");
  }

  /**
   * This method records that the link has been clicked and redirects the
   * browser to the specific link.
   * 
   * @param businessItem
   * @return
   */
  public String recordLinkClickAndRedirect(BusinessItem businessItem) {
    businessItem.incrementClicks();
    return businessItem.getExternalLinkURL();
  }

  /**
   * This method is required by some scopes, e.g., Session scope.
   */
//  @Destroy
//  @Remove
  public void destroyAndRemove() {
    // n.a.
  }
}


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