4 Replies Latest reply on May 9, 2011 11:05 AM by iga3k

a4j:keepAlive - Bean is alive too long

pbaker01 Oct 19, 2008 4:43 PM

I need some help understanding keepAlive.

I have a number of content pages that are reRendered based on a panelMenu selection. Each content view contains a keepAlive tag for its assocoiated "Controller" bean.

The problem is that I want to "kill" the Controller bean once a new content view is rendered. But with the current implementation, once keepAlive has been invoked for a bean, the bean is not released. The problem may be that the "page" does not change just the content.

Is there a way to release a "keepAlive" bean based on a view and not the page?

Example: the content varies based on the panelMenu selection.

<html xmlns="http://www.w3.org/1999/xhtml"
 xmlns:ui="http://java.sun.com/jsf/facelets"
 xmlns:h="http://java.sun.com/jsf/html"
 xmlns:rich="http://richfaces.ajax4jsf.org/rich"
 xmlns:a4j="http://richfaces.org/a4j"
 xmlns:c="http://java.sun.com/jstl/core"
 xmlns:f="http://java.sun.com/jsf/core" xml:lang="en" lang="en">

 <rich:panel id="contentPage">
 <c:if test="#{ahm565State.selectionPage == 'alnSupplierPage'}">
 <a4j:include viewId="/contentPage/alnSupplierPage.xhtml" />
 </c:if>

 <c:if test="#{ahm565State.selectionPage == 'alnCarrierPage'}">
 <a4j:include viewId="/contentPage/alnCarrierPage.xhtml" />
 </c:if>

 <c:if test="#{ahm565State.selectionPage == 'alnRevisionsPage'}">
 <a4j:include viewId="/contentPage/alnRevisionsPage.xhtml" />
 </c:if>

 <c:if test="#{ahm565State.selectionPage == 'alnEffectiveSheetsPage'}">
 <a4j:include viewId="/contentPage/alnEffectiveSheetsPage.xhtml" />
 </c:if>

 <c:if test="#{ahm565State.selectionPage == 'alnDocumentsPage'}">
 <a4j:include viewId="/contentPage/alnDocumentsPage.xhtml" />
 </c:if>

 <c:if test="#{ahm565State.selectionPage == 'alnMessagesPage'}">
 <a4j:include viewId="/contentPage/alnMessagesPage.xhtml" />
 </c:if>

 </rich:panel>
</html>

Each content view start off like this with a keepAlive for the associated controller bean. So, in this case supplierController is kept alive between requests. But if I change the view, I want to "release" supplierController.

Any ideas?

<html xmlns="http://www.w3.org/1999/xhtml"
 xmlns:ui="http://java.sun.com/jsf/facelets"
 xmlns:h="http://java.sun.com/jsf/html"
 xmlns:rich="http://richfaces.ajax4jsf.org/rich"
 xmlns:a4j="http://richfaces.org/a4j"
 xmlns:c="http://java.sun.com/jstl/core"
 xmlns:f="http://java.sun.com/jsf/core" xml:lang="en" lang="en">

 <body>
 <center>
 <h:outputLabel value="Supplier" styleClass="TitleNormal" />
 </center>

 <ui:include src="/messages.xhtml" />

 <a4j:keepAlive beanName="supplierController" ajaxOnly="true" />

1. Re: a4j:keepAlive - Bean is alive too long

nbelaevski Oct 19, 2008 6:57 PM (in response to pbaker01)

Hi,

keepAlive beans are stored as an attribute of UIViewRoot with special name: http://fisheye.jboss.org/browse/RichFaces/tags/3.2.2.GA/ui/core/src/main/java/org/ajax4jsf/taglib/html/jsp/KeepAliveTag.java?r=10314 - see lines 115-117. AjaxPhaseListener is used to put that beans into request scope: http://fisheye.jboss.org/browse/RichFaces/tags/3.2.2.GA/framework/impl/src/main/java/org/ajax4jsf/event/AjaxPhaseListener.java?r=10314 .

So for the case of included views bean is not updated because there is already created instance of the bean.

I suggest that you remove bean from UIViewRoot attributes explicitly or update bean's fields to reflect the state properly.
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2. Re: a4j:keepAlive - Bean is alive too long

pbaker01 Oct 19, 2008 7:11 PM (in response to pbaker01)

Hi nbelaevski,

Thanks for the reply.
It is a very messy solution.

Oh well..

PB
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3. Re: a4j:keepAlive - Bean is alive too long

pbaker01 Oct 19, 2008 7:43 PM (in response to pbaker01)

If anyone else has this problem. Here is my reluctant solution:

/**
 * Remove all KeepAlive beans from the view.
 *
 */
public void clearKeepAlive() {
 FacesContext fc = FacesContext.getCurrentInstance();
 for (String key: new ArrayList<String>(fc.getViewRoot().getAttributes().keySet())) {
 if (key.startsWith(AjaxPhaseListener.AJAX_BEAN_PREFIX)) {
 fc.getViewRoot().getAttributes().remove(key);
 }
 }
}

4. a4j:keepAlive - Bean is alive too long

iga3k May 9, 2011 11:05 AM (in response to pbaker01)

This is not working for me. I have removed all the ajavax beans from the ViewRoot according to this code snippet, but when I navigate back to that page using the redirect, I still have the old data.

This is how the redirect is implemented.

ExternalContext context = FacesContext.getCurrentInstance().getExternalContext();
context.redirect(SIGN_PAYMENT_VIEW);

This is in a portlet environment.(Liferay 6.0.5, RichFaces 3.3.3, PortletBridge 2.1.0)
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