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The following example shows how to disable ICEfaces Extended Request scope and restore standard request scope in the WEB-INF/webxml configuration file:
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<context-param> <param-name> comicesoftfacesstandardRequestScope </param-name> <param-value>true</param-value> </context-param>
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ICEfaces Ajax Push and Inter-Portlet Communication
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While the Portlet 20 standard defines techniques for performing inter-portlet communication (IPC), they cause either an HTTP GET or HTTP POST, which results in a full-page reload and a disruptive end-user experience ICEfaces provides a natural way for portlets to perform IPC via ICEfaces Ajax Push ICEfaces pioneered Ajax Push, which is sometimes referred to as Reverse Ajax or Comet The technology provides the ability for server-initiated events to cause incremental page updates to be sent to the browser With ICEfaces Ajax Push, developers can create collaborative and dynamic enterprise applications like never before
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Ajax Push
Partial submit
Server event ICEfaces App server
FIGURE A-6
Inter-portlet communication with Ajax Push
PART III
Because the mechanism facilitates asynchronous updates from the server to the client, interaction with one ICEfaces portlet can trigger communication with other ICEfaces portlets by changing values in JSF backing and model managed beans This mechanism is not restricted to IPC among portlets on the same portal page in a single browser but can include updating other browsers that are interacting with the same portal page The result is not just inter-portlet communication, but inter-portlet, inter-browser communication, as shown in Figure A-6 Additionally, ICEfaces Ajax Push solves the potentially disruptive end-user experience associated with the Portlet 20 standard IPC techniques The following is a list of guidelines for achieving IPC with ICEfaces Ajax Push: Package the portlets that need to communicate in the same WAR In order to share data between portlets, use application-scoped beans or requestscoped beans that store data in PortletSessionAPPLICATION_SCOPE Use the ICEfaces Ajax Push SessionRenderer to trigger client updates when the shared data changes
Example Usage
The following example shows how to develop a JSF managed bean in application scope that maintains a chat log that participates in ICEfaces Ajax Push using the SessionRenderer This class does not address concurrency
/* * This is a file named ChatRoomManagedBeanjava * that is registered as a JSF managed-bean in * application scope */ import comicesoftfacesasyncrenderSessionRenderer; import javautilArrayList;
Part III:
JavaSer ver Faces Tools and Libraries
import javautilList; import javaxfaceseventActionEvent; public class ChatRoomManagedBean { private String messageText; private List<String> messages = new ArrayList<String>(); private static final String AJAX_PUSH_GROUP_NAME = "chatRoom"; public ChatRoomsModel() { SessionRendereraddCurrentSession( AJAX_PUSH_GROUP_NAME); } public void addMessage(ActionEvent actionEvent) { messagesadd(messageText); SessionRendererrender(AJAX_PUSH_GROUP_NAME); } public List<String> getMessages() { return messages; } public String getMessageText() { return messageText; } public void setMessageText(String messageText) { thismessageText = messageText; } } <!-- This is a Facelet view named chatRoomxhtml --> < xml version="10" encoding="UTF-8" > <f:view xmlns="http://wwww3org/1999/xhtml" xmlns:f="http://javasuncom/jsf/core" xmlns:ice="http://wwwicesoftcom/icefaces/component" xmlns:xsi="http://wwww3org/2001/XMLSchema-instance" xsi:schemaLocation="http://wwww3org/1999/xhtml http://wwww3org/2002/08/xhtml/xhtml1-transitionalxsd"> <ice:portlet> <ice:form> <ice:dataTable value="#{chatRoomManagedBeanmessages}" var="message"> <ice:column> <ice:outputText value="#{message}" /> </ice:column> </ice:dataTable> <ice:inputText value="#{chatRoomManagedBeanmessageText}" /> <ice:commandButton
Appendix:
JSF Portlets
actionListener="#{chatRoomManagedBeanaddMessage}" /> </ice:form> </ice:portlet> </f:view>
Note that the TritonSource project contains open source demonstration portlets that focus on ICEfaces portlets for Liferay Portal Specifically, TritonSource has a demonstration portlet featuring an ICEfaces chat room that integrates with Liferay Portal s Friends Social Networking services When friends sign in to Liferay Portal, a server-initiated event triggers ICEfaces Ajax Push so that other friends that are online become aware of their friend s online presence Additionally, when the user clicks a Chat icon, ICEfaces Ajax Push is used for IPC to begin a new chat room in a Chat Portlet The TritonSource project Web site can be found at: wwwtritonsourceorg
ICEfaces Themes and Portal Themes
The ICEfaces Component Suite fully supports consistent component styling via a set of predefined CSS style classes and associated images Changing the component styles for a Web application developed with the ICEfaces Component Suite is as simple as changing the style sheet used ICEfaces ships with a set of predefined style sheets are available to be used as-is, or customized to meet the specific requirements of the application There are five predefined ICEfaces style sheets included, two of which are designed to be used inside a portlet container: rimecss rime-portletcss xpcss xp-portletcss royalecss
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