Updating Your JSF Application's Service Layer

Just as you did in a previous JSF learning path on Adding Permissions Resources to the Service Layer, you’ll need to add a service method in your GuestbookLocalServiceImpl class. The new service method you’ll create needs to delete a guestbook and its resources from the database. By creating this method, you’ll be able to create the Delete button, which will be used to delete guestbook entities from your Guestbook Admin portlet.

Adding the Delete Service Method for Your Guestbook Entities

Remember from previous learning paths that when editing your -LocalServiceImpl classes, you must run Service Builder to update the affected interfaces and other affected generated code. Begin adding the new service method by following the instructions below:

1. Open the GuestbookLocalServiceImpl class and add the deleteGuestbook method.

    @Override
    public Guestbook deleteGuestbook(Guestbook guestbook) throws PortalException, SystemException {
   
        resourceLocalService.deleteResource(guestbook.getCompanyId(), Guestbook.class.getName(),
            ResourceConstants.SCOPE_INDIVIDUAL, guestbook.getPrimaryKey());
   
        return super.deleteGuestbook(guestbook);
    }
   

   Similar to the addGuestbook(…) method you added previously to this class, this method deletes the specified guestbook and any resources it possesses.

2. Press Ctrl-Shift-O to add and organize the class’ necessary imports.

3. Build your Guestbook portlet’s services by right-clicking the project and selecting Liferay → Build Services.

You’re probably wondering why you’re not adding service methods for the Edit and Permissions buttons. There is no need to provide an update method for the Edit button because editing a guestbook will be controlled by the GuestbookBacking bean and the guestbook view.

Recall when the Edit button is selected for entries, your master view calls the edit(entry) method from the EntryBacking bean. This method sets the selected entry and then calls the GuestbookBacking bean’s editEntry() method. The editEntry() method sets the editingEntry boolean variable to true. In turn, when the view.xhtml runs, it chooses to display the entry view when this boolean variable is true, which brings up the editing menu. Once you’ve finished editing and click the Save button, your entry view calls the EntryBacking bean’s save() method, which updates the entry. This process will be followed similarly with guestbook entities.

For permissions, you’ll also create a process similar to the Entry entity’s process of creating the permissionsURL property and calling that URL when the Permissions button is selected.

You now have the appropriate service method for deleting guestbooks, and a general idea of how the other buttons will be implemented. Next, you’ll begin working on the Guestbook Admin’s portlet actions and permissions.