[richfaces-issues] [JBoss JIRA] Updated: (RF-8197) Optimize AjaxChildrenRenderer render component check algorithm

[Nick Belaevski (JIRA)]

     [ https://jira.jboss.org/jira/browse/RF-8197?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nick Belaevski updated RF-8197:
-------------------------------

    Fix Version/s: 4.0.0.BETA1
         Assignee: Nick Belaevski


> Optimize AjaxChildrenRenderer render component check algorithm
> --------------------------------------------------------------
>
>                 Key: RF-8197
>                 URL: https://jira.jboss.org/jira/browse/RF-8197
>             Project: RichFaces
>          Issue Type: Patch
>      Security Level: Public(Everyone can see) 
>          Components: core
>    Affects Versions: 3.3.2.SR1
>         Environment: Myfaces 1.2.8, Facelets 1.1.15, Tomcat 6.0.20
>            Reporter: Jan Ziegler
>            Assignee: Nick Belaevski
>             Fix For: 4.0.0.BETA1
>
>
> I just realized some possible "lifecycle processing overhead" when doing ajax actions: 
> In render response phase each ajax component is checked for rendering by the method AjaxChildrenRenderer.encodeAjaxComponent(). That - what I could see -  is the case when:
> 1) the component´s rendered-attribute is true
> 2) the component is ajaxRendered 
> 3) the componentId is defined in the reRenderId-List
> This also reflects the order of checking, so the first thing to be done is check if the component´s rendered-attribute is true. But this might also lead to additional lifecycle processings when 
>  rendered-conditions are bound to managed beans by el expressions. To evaluate the rendered condition, request scoped managed beans must be created. to my opion this is suboptimal, like in my case the managed bean performs some (time intensive?) actions in its constructor or the rendered conditions relies on a list which must be fetched from the database - and this also happens even if the componentId is not in den reRenderId-List. 
> So why not first evaluate if the componentId is in the reRenderId-List or the component is ajaxRendered and then (if one of this conditions is true) additionally check the rendered-condition?
> This might be accomplished with a small change AjaxChildrenRenderer.encodeAjaxComponent():
> {code}
> public void encodeAjaxComponent(FacesContext context,
> 			UIComponent component, String currentPath, Set<String> ids,
> 			Set<String> renderedAreas) throws IOException {
> 		if (component.isRendered()) { // skip not-rendered components.
> 			boolean found = false;
> 			boolean limitToList = AjaxContext.getCurrentInstance(context).isLimitToList();
> 			String elementId = component.getId();
> 			String absoluteId = currentPath + elementId;
> 			if (!ids.isEmpty()) {
> 				// list for rendering may contains absolute id ( best ),
> 				// component Id or client ID
> 				// String clientId = element.getClientId(context);
> 				if (ids.contains(absoluteId) || ids.contains(elementId)) {
> 					if (log.isDebugEnabled()) {
> 						log.debug(Messages.getMessage(
> 								Messages.RENDER_AJAX_AREA_INFO, absoluteId));
> 					}
> 					// renderChild(context, element);
> 					found = true;
> 				}
> 			}
> 			// 
> 			if (!found && limitToList
> 					&& component instanceof NamingContainer
> 					&& noIdUnderPath(absoluteId
> 							+ NamingContainer.SEPARATOR_CHAR, ids)) {
> 				return;
> 			}
> 			if (!found && !limitToList && component instanceof AjaxOutput) {
> 				if (((AjaxOutput) component).isAjaxRendered()) {
> 					// renderChild(context, element);
> 					found = true;
> 				}
> 			}
> 			if (!found) {
> 				if (component instanceof AjaxChildrenEncoder) {
> 					((AjaxChildrenEncoder) component).encodeAjaxChild(context,
> 							currentPath, ids, renderedAreas);
> 				} else {
> 					// Special case - for control components, not produced
> 					// html code - such as message bundles loaders,
> 					// MyFaces aliases etc. we call encodeBegin/end methods
> 					// even if components not in rendered areas.
> 					boolean special = isSpecialElement(context, component);
> 					if (special) {
> 						component.encodeBegin(context);
> 					}
> 					encodeAjaxChildren(context, component, currentPath, ids,
> 							renderedAreas);
> 					if (special) {
> 						component.encodeEnd(context);
> 					}
> 				}
> 			} else {
> 				renderedAreas.add(component.getClientId(context));
> 				renderChild(context, component);
> 			}
> 		}
> 	}
> {code}
> Patched version (the isRendered()-condition is moved the the last else-Block before renderChild() is called and the component will be rendered):
> public void encodeAjaxComponent(FacesContext context,
> 			UIComponent component, String currentPath, Set<String> ids,
> 			Set<String> renderedAreas) throws IOException {
> 		boolean found = false;
> 		boolean limitToList = AjaxContext.getCurrentInstance(context).isLimitToList();
> 		String elementId = component.getId();
> 		String absoluteId = currentPath + elementId;
> 		if (!ids.isEmpty()) {
> 			// list for rendering may contains absolute id ( best ),
> 			// component Id or client ID
> 			// String clientId = element.getClientId(context);
> 			if (ids.contains(absoluteId) || ids.contains(elementId)) {
> 				if (log.isDebugEnabled()) {
> 					log.debug(Messages.getMessage(
> 							Messages.RENDER_AJAX_AREA_INFO, absoluteId));
> 				}
> 				// renderChild(context, element);
> 				found = true;
> 			}
> 		}
> 		// 
> 		if (!found && limitToList
> 				&& component instanceof NamingContainer
> 				&& noIdUnderPath(absoluteId
> 						+ NamingContainer.SEPARATOR_CHAR, ids)) {
> 			return;
> 		}
> 		if (!found && !limitToList && component instanceof AjaxOutput) {
> 			if (((AjaxOutput) component).isAjaxRendered()) {
> 				// renderChild(context, element);
> 				found = true;
> 			}
> 		}
> 		if (!found) {
> 			if (component instanceof AjaxChildrenEncoder) {
> 				((AjaxChildrenEncoder) component).encodeAjaxChild(context,
> 						currentPath, ids, renderedAreas);
> 			} else {
> 				// Special case - for control components, not produced
> 				// html code - such as message bundles loaders,
> 				// MyFaces aliases etc. we call encodeBegin/end methods
> 				// even if components not in rendered areas.
> 				boolean special = isSpecialElement(context, component);
> 				if (special) {
> 					component.encodeBegin(context);
> 				}
> 				encodeAjaxChildren(context, component, currentPath, ids,
> 						renderedAreas);
> 				if (special) {
> 					component.encodeEnd(context);
> 				}
> 			}
> 		} else if (component.isRendered()) { // skip not-rendered components.
> 			renderedAreas.add(component.getClientId(context));
> 			renderChild(context, component);
> 		}
> 	}
> {code}

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