com.ibm.wps.struts.action
Class StrutsAction

java.lang.Object
  Action
      com.ibm.wps.struts.action.StrutsAction

Direct Known Subclasses:

WpsDispatchAction

public class StrutsAction
extends Action

A StrutsAction is an adapter between the contents of an incoming portlet request and the corresponding business logic that should be executed to process this request. The controller (WpsStrutsActionServlet) will select an appropriate StrutsAction for each request, create an instance (if necessary), and call the execute method.

StrutsActions must be programmed in a thread-safe manner, because the controller will share the same instance for multiple simultaneous requests. This means you should design with the following items in mind:

• Instance and static variables MUST NOT be used to store information related to the state of a particular request. They MAY be used to share global resources across requests for the same action.
• Access to other resources (JavaBeans, session variables, etc.) MUST be synchronized if those resources require protection. (Generally, however, resource classes should be designed to provide their own protection where necessary.

When a StrutsAction instance is first created, the controller servlet will call setServlet() with a non-null argument to identify the controller servlet instance to which this Action is attached. When the controller servlet is to be shut down (or restarted), the setServlet() method will be called with a null argument, which can be used to clean up any allocated resources in use by this Action.

The StrutsAction is a Portal friendly action to which the portlet objects are passed directly. This is the preferred interface for Struts applications that do not need to support the servlet environment.

Since:

4.1

Constructor Summary

StrutsAction()
Constructor for this class.

Method Summary

ActionForward	execute(ActionMapping mapping, ActionForm form, PortletRequest request) Processes the current request based on the ActionMapping information.
ActionForward	execute(ActionMapping mapping, ActionForm form, PortletRequest request, PortletResponse response) Processes the current request based on the ActionMapping information.
void	sendError(PortletRequest portletRequest, int sc) Sends an error response to the client using the specified status.
void	sendError(PortletRequest portletRequest, int sc, java.lang.String msg) Sends an error response to the client using the specified status code and descriptive message.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StrutsAction

public StrutsAction()

Constructor for this class.

Method Detail

execute

public ActionForward execute(ActionMapping mapping,
                             ActionForm form,
                             PortletRequest request)
                      throws java.lang.Exception

Processes the current request based on the ActionMapping information. The processing should return an ActionForward, to control the processing. This implementation does not allow the response object to be written to directly, so an ActionForward should be returned. A null return value will stop the request processing, but will not result in the creation of a new IViewCommand.

Parameters:

mapping - The ActionMapping used to select this instance

form - The optional ActionForm bean for this request (if any)

request - The PortletRequest we are processing

Returns:

returns the ActionForward object, can be null

Throws:

java.lang.Exception - if the application business logic throws an exception

execute

public ActionForward execute(ActionMapping mapping,
                             ActionForm form,
                             PortletRequest request,
                             PortletResponse response)
                      throws java.lang.Exception

Processes the current request based on the ActionMapping information. The processing should return an ActionForward, to control the processing. This implementation passes the response object and will be called if the Action implements the IStrutsPrepareRender interface. A null return value will stop the request processing, but will not result in the creation of a new IViewCommand.

Parameters:

mapping - The ActionMapping used to select this instance

form - The optional ActionForm bean for this request (if any)

request - The PortletRequest we are processing

response - The PortletResponse we are processing

Returns:

returns the ActionForward object, can be null

Throws:

java.lang.Exception - if the application business logic throws an exception

sendError

public void sendError(PortletRequest portletRequest,
                      int sc,
                      java.lang.String msg)
               throws java.io.IOException

Sends an error response to the client using the specified status code and descriptive message. The server generally formats the response to look like a normal server error page.

Parameters:

portletRequest - the PortletRequest this error report is associated with

sc - the error status code

msg - the descriptive message

Throws:

java.io.IOException - if there is a problem saving the error information

sendError

public void sendError(PortletRequest portletRequest,
                      int sc)
               throws java.io.IOException

Sends an error response to the client using the specified status. The server generally formats the response to look like a normal server error page.

Parameters:

portletRequest - the PortletRequest this error report is associated with

sc - the error status code

Throws:

java.io.IOException - if there is a problem saving the error information