GOOD! I like it too, I vote for it.-
But I don't think that init() would replace processRequest(), since init()
should be called when the bean is created and processRequest() should be
called every request even if the bean has application or session scope.-
Walter Jerusalinsky
> -----Original Message-----
> From: A mailing list about Java Server Pages specification and reference
> [mailto:[EMAIL PROTECTED]]On Behalf Of James Klicman
> Sent: Thursday, May 06, 1999 10:02 PM
> To: [EMAIL PROTECTED]
> Subject: Pagelets Proposal
>
>
> I think that the processRequest did provide some benefits. Although it
> really left me wanting a little bit more.
>
> The main benefit of processRequest as I see it, is the beginning of
> some structure and definition of what a JSP bean is. Unfortunately, it
> seems that some are very against any kind of JSP specific bean
> interface. Possibly for fear that all beans used in JSP would then need
> to be JSP specific. I agree that any type of bean should be able to be
> used inside of JSP. I also think that there is much to gain from
> defining a JSP specific bean interface. We could call beans that
> implement this interface Pagelets.
>
>
> The key benefits of Pagelets would be:
>
> * Having a non-intrusive interface that JSP beans can optionally
> implement.
> * Ability to create Servlet and JSP aware beans.
> * Beans that can cleanup after itself.
> * Pagelets would be thread-safe since a Pagelet can only be
> associated with one page at a time.
> * A place to put processRequest
>
>
> Here is what the Pagelet interface can look like:
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> - - - -
> package javax.servlet.jsp;
>
> public interface Pagelet {
>
> /**
> * Initializes the pagelet. Pagelets have a lifespan of page.
> * destroy() is called at the end of _jspService.
> */
> public void init(PageContext pageContext);
>
> /**
> * <p>This method gives the pagelet an opportunity
> * to clean up any resources that are being held (for example,
> * jdbc connections)
> */
> public void destroy();
>
>
> /**
> * Backwards compatibility, init(PageContext pageContext) would
> * replace it.
> *
> * @deprecated
> */
> public void processRequest(HttpServletRequest request);
> }
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> - - - -
>
>
> Here are Pagelets in action:
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> - - - -
> <jsp:useBean id="jdbcConnection" scope="page"
> class="pagelets.JdbcConnection"/>
> <jsp:useBean id="allUsers" scope="page" class="pagelets.AllUsers"/>
> <jsp:useBean id="allGroups" scope="page" class="pagelets.AllGroups"/>
>
> <html>
> All Users:<br>
> <ol>
> <%
> String[] users = allUsers.getUsers();
> for (int i = 0; i < users.length; i++) {
> %>
> <li> <%= users[i] %>
> <%
> }
> %>
> </ol>
> <p>
>
> All Groups:<br>
> <ol>
> <%
> String[] groups = allGroups.getGroups();
> for (int i = 0; i < groups.length; i++) {
> %>
> <li> <%= groups[i] %>
> <%
> }
> %>
> </ol>
>
> </html>
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> - - - -
>
> How Pagelets benefit us in this example would be automatic clean up of
> the JDBC connection and the ability to invisibly share the connection.
> The Pagelet jdbcConnection would have its destroy() method called at
> the end of _jspService and would then close the connection. Meanwhile
> both allUsers and allGroups could have used the database connection
> that jdbcConnection created and made available through the
> request.setAttribute().
>
>
> I think Pagelets can consolidate and provide some features that people
> have been asking for on the JSP list. One being processRequest
> functionality and another being Thread-Safe beans, and my personal
> favorite automatic bean cleanup.
>
> -James Klicman
>
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