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FIGURE A-4 Inter-portlet communication
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Strictly speaking, Portlet 10 and 20 only provide the ability for developers to write a Java class that writes HTML markup to the response that is delivered to the Web browser Although it is possible to introduce a markup-based view technology like JSP, portlet developers often choose the JSF framework in order to leverage the MVC design pattern and robust UI component features
JSF Portlet Bridges
As mentioned previously, the Portlet 10 and JSF 10 specifications were formulated during roughly the same time frame Consequently, the JSF expert group was able to design a framework with portlet compatibility in mind This is evidenced by methods like ExternalContextgetRequest( ), which returns a value of type Object, rather than a value of type javaxservlethttpHttpServletRequest When running inside a portlet container, the same method would return a value of type javaxportletPortletRequest Although the JSF API provides a degree of portlet compatibility, in order to use JSF in a portlet, developers must specify a JSF portlet bridge in the <portlet-class> element of the WEB-INF/portletxml
Part III:
JavaSer ver Faces Tools and Libraries
configuration file JSF portlet bridges provide an abstraction layer such that developers can (in most cases) develop JSF portlets in the same way in which they would develop JSF Web applications Bridge implementations are either based on the JSR 301 standard or the JSR 329 standard, or else they were developed as innovative open source projects prior to the formulation of the standards The JSR 301 standard defines a bridge API for Portlet 10 + JSF 12, whereas the JSR 329 standard defines a bridge API for Portlet 20 + JSF 12 The reference implementations for JSR 301 and JSR 329 can be downloaded from the Apache MyFaces Portlet Bridge project: http://myfacesapacheorg/portlet-bridge
E XPERT GROUP I NSIGHT At the time of this writing, the Subversion repository for the JSR 329
MyFaces Portlet Bridge reference implementation provides a branch with prototype support for Portlet 20 + JSF 20: http://svnapacheorg/repos/asf/myfaces/portlet-bridge/core/branches Also at the time of this writing, it has not yet been determined whether or not JSF 20 support will continue under JSR 329, under a new JSR, or without the structure of a JSR With the advent of the Portlet 20 RESOURCE_PHASE for Ajax, bridges that support the Ajax features of JSF 20 will require a Portlet 20 compliant portlet container in which to run
JSF portlet bridges are responsible for providing a bridge between the portlet lifecycle and the JSF lifecycle For example, when a portal page that contains a JSF portlet is requested via HTTP GET, then the RENDER_PHASE of the portlet lifecycle should in turn execute the RESTORE_VIEW and RENDER_RESPONSE phases of the JSF lifecycle Similarly, when the user submits a form contained within a JSF portlet via HTTP POST, then the ACTION_PHASE of the portlet lifecycle should execute the complete JSF lifecycle of RESTORE_VIEW, APPLY_REQUEST_VALUES, PROCESS_VALIDATIONS, UPDATE_ MODEL_VALUES, INVOKE_APPLICATION, and RENDER_RESPONSE Since the portal is in full control of managing URLs, JSF portlet bridges are also responsible for asking the portal to generate URLs that are compatible with actions that invoke JSF navigation rules Consequently, JSF portlets may not perform a redirect If a different JSF view is to be rendered as a result of a JSF navigation rule, then the JSF portlet bridge simply displays the new JSF view in the same portlet window A quick reference of several JSF portlet bridges is provided in Table A-1
Example Usage
The following example shows how to specify the JSR 301 or JSR 329 JSF Portlet Bridge in the WEB-INF/portletxml configuration file, as well as default Facelet views that are to be rendered for VIEW mode, EDIT mode, and HELP mode:
<portlet-app> <portlet> <portlet-name>my_portlet</portlet-name> <display-name>My Portlet</display-name> <portlet-class> javaxportletfacesGenericFacesPortlet </portlet-class> <init-param> <name>javaxportletfacesdefaultViewIdview</name> <value>/xhtml/applicantFormxhtml</value> </init-param> <init-param>
Appendix:
JSF Portlets
<name>javaxportletfacesdefaultViewIdedit</name> <value>/xhtml/editxhtml</value> </init-param> <init-param> <name>javaxportletfacesdefaultViewIdhelp</name> <value>/xhtml/helpxhtml</value> </init-param> <supports> <mime-type>text/html</mime-type> <portlet-mode>view</portlet-mode> <portlet-mode>edit</portlet-mode> <portlet-mode>help</portlet-mode> </supports> </portlet> </portlet-app>
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