Examples of org.apache.struts.action.Action

org.apache.struts.action.Action
An Action is an adapter between the contents of an incoming HTTP request and the corresponding business logic that should be executed to process this request. The controller (RequestProcessor) will select an appropriate Action for each request, create an instance (if necessary), and call the execute method.

Actions 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 an Action instance is first created, the controller will call setServlet with a non-null argument to identify the servlet instance to which this Action is attached. When the 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.
@version $Rev: 421119 $ $Date: 2005-08-26 21:58:39 -0400 (Fri, 26 Aug 2005)$

  protected Action extendedProcessActionCreate(HttpServletRequest request, HttpServletResponse response,
      ActionMapping actionMapping) throws IOException
  {


    String className = actionMapping.getType();
    Action action = null;


    boolean isNew = false;


    synchronized (actions)
    {


      action = (Action) actions.get(className);


      if (action == null)
      {


        try
        {


          // load the action class
          Class clazz = Class.forName(className);


          // delegate action creation to ActionCreator
          action = actionCreator.createAction(clazz);


          action.setServlet(this.servlet);
          isNew = true;


        }
        catch (Exception e)
        {

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   */
  protected Action processActionCreate(HttpServletRequest request, HttpServletResponse response,
      ActionMapping actionMapping) throws IOException
  {


    Action action = extendedProcessActionCreate(request, response, actionMapping);
    if (action != null)
      return action;


    return super.processActionCreate(request, response, actionMapping);
  }

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   */
  protected Action processActionCreate(HttpServletRequest request, HttpServletResponse response,
      ActionMapping actionMapping) throws IOException
  {


    Action action = extendedProcessActionCreate(request, response, actionMapping);
    if (action != null)
      return action;


    return super.processActionCreate(request, response, actionMapping);
  }

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  }


  public Action createAction(Class actionClass) throws Exception
  {


    Action strutsAction = null;


    // Create and return a new Action instance
    if (log.isTraceEnabled())
    {
      log.trace("Creating new Action instance");

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    checkIsAssignable(actionBeanClass, actionInterfaceType, controllerClass);


    Object controllerActionInstance = instantiateControllerAction(controllerClass, actionBeanClass);


    // cast to Struts action
    Action strutsAction = (Action) controllerActionInstance;


    // cast the same reference to ControllerAction, so that its factory can be set
    ControllerAction controllerAction = (ControllerAction) controllerActionInstance;


    if (controllerAction instanceof BeanSourceAware)

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  protected Action extendedProcessActionCreate(HttpServletRequest request, HttpServletResponse response,
      ActionMapping actionMapping) throws IOException
  {


    String className = actionMapping.getType();
    Action action = null;


    boolean isNew = false;


    synchronized (actions)
    {


      action = (Action) actions.get(className);


      if (action == null)
      {


        try
        {


          // load the action class
          Class clazz = Class.forName(className);


          // delegate action creation to ActionCreator
          action = actionCreator.createAction(clazz);


          action.setServlet(this.servlet);
          isNew = true;


        }
        catch (Exception e)
        {

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        // Now try to create actions and run the provided action target on each.
        // Any forwards returned are ignored
        for (SubActionWrapper wrapper : subActions) {
            try {
                    // We have an action config, so get the action instance
                    Action action = processActionCreate(request, response, wrapper.getMapping());
                    // Identify the method object to be dispatched to
                    if (dispatchForm.isSubFormEmpty() || wrapper.getForm().equals(subform) || refreshAll) {
                        Method method = getMethod(action, name);
                        Object args[] = { wrapper.getMapping(), wrapper.getForm(), request, response };
                        // Invoke the method. We don't care about the forward

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  protected Action processActionCreate(HttpServletRequest request,
      HttpServletResponse response, ActionMapping mapping)
      throws IOException {


    Action instance = super.processActionCreate(request, response, mapping);
    if (instance instanceof Support) {
      ((Support) instance).setDaoFactory(daoFactory);
    }
    return (instance);
  }

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        throws IOException {


        if (log.isTraceEnabled()) {
            log.trace("Performing standard action create");
        }
        Action result = super.processActionCreate(request, response, mapping);
        if (log.isDebugEnabled()) {
            log.debug("Standard action create returned " +
                      result.getClass().getName() + " instance");
        }
        return (result);


    }

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        throws IOException {


        if (log.isTraceEnabled()) {
            log.trace("Performing standard action create");
        }
        Action result = super.processActionCreate(request, response, mapping);
        if (log.isDebugEnabled()) {
            log.debug("Standard action create returned " +
                      result.getClass().getName() + " instance");
        }
        return (result);


    }

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