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 $ $Date: 2005-08-26 21:58:39 -0400 (Fri, 26 Aug 2005)$

        throws IOException, ServletException {


        ActionMapping mapping =
            processMapping(path,request);


        Action action =
            processActionCreate(mapping,request);


        ActionForward forward =
            processActionPerform(
                action,mapping,form,request,response);

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            return (false);
        }


        // Create (if necessary) and cache an Action instance
        Action action = getAction(actionCtx, type, actionConfig);


        if (LOG.isTraceEnabled()) {
            LOG.trace("setting action to " + action);
        }

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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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        if (type == null) {
            return (false);
        }


        // Create (if necessary) and cache an Action instance
        Action action = null;
        Map actions = getActions(context, actionConfig.getModuleConfig());
        synchronized (actions) {
            action = (Action) actions.get(type);
            if (action == null) {
                log.info("Initialize action of type: " + type + " for actionConfig " + actionConfig);
                action = (Action) ClassUtils.getApplicationInstance(type);
                ActionServlet actionServlet = (ActionServlet)
                    context.get(getActionServletKey());
                action.setServlet(actionServlet);
                actions.put(type, action);
            }
        }
        context.put(getActionKey(), action);

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        if ((valid == null) || !valid.booleanValue()) {
            return (false);
        }


        // Acquire the resources we will need to send to the Action
        Action action = (Action)
            context.get(getActionKey());
        if (action == null) {
            return (false);
        }
        ActionConfig actionConfig = (ActionConfig)

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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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            assert fc != null : "no FlowController for request " + request.getRequestURI();
            assert fc.getClass().getName().equals( actionMapping.getParameter() )
                    : "current page flow  type " + fc.getClass().getName() + " does not match type specified in "
                      + FLOW_CONTROLLER_ACTION_CLASSNAME + ": " + actionMapping.getParameter();


            Action action = new FlowControllerAction( fc );
            action.setServlet( servlet );
            return action;
        }


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

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      throws IOException {


    String className = mapping.getType();
    boolean firstInstance = !actions.containsKey(className);


    Action action = super.processActionCreate(request, response, mapping);


    if ((action instanceof ActionInstance) && (firstInstance)) {
      try {
        ((ActionInstance) action).init(request, response, mapping);
      } catch (Exception e) {

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    public void destroy()
    {
        synchronized(this.actions)
        {
            for (Iterator iter = super.actions.values().iterator(); iter.hasNext();) {
        Action action = (Action) iter.next();
            if (action instanceof ActionInstance)  
               ((ActionInstance) action).destroy();
      }
        }

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            assert fc != null : "no FlowController for request " + request.getRequestURI();
            assert fc.getClass().getName().equals( actionMapping.getParameter() )
                    : "current page flow  type " + fc.getClass().getName() + " does not match type specified in "
                      + FLOW_CONTROLLER_ACTION_CLASSNAME + ": " + actionMapping.getParameter();


            Action action = new FlowControllerAction( fc );
            action.setServlet( servlet );
            return action;
        }


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

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org.apache.struts.chain.AbstractExecuteAction

org.apache.struts.chain.commands.AbstractCreateAction

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