Liferay Portal 请求过程解析

Portlet render请求解析
   1、请求经过MainServlet，再转交PortalRequestProcessor
    默认交给LayoutAction，由LayoutAction分发到render_portlet.jsp。

	protected ActionForward processLayout(
			ActionMapping mapping, HttpServletRequest request,
			HttpServletResponse response, long plid)
		throws Exception {

	// Include layout content before the page loads because
			// portlets on the page can set the page title and page
			// subtitle

			includeLayoutContent(
						request, response, themeDisplay, layout);

2、在render_portlet.jsp拿到portlet实例，开始portlet内部调用，通过invokerPortlet.render(...)执行portlet 的render方法。

if (portlet.isActive() && access && supportsMimeType) {
	try {
		invokerPortlet.render(renderRequestImpl, renderResponseImpl);

3、LiferayPortlet.doDispatch根据PortletMode转发到具体执行方法，以view为例，将会调用StrtutsPortlet.doView

protected void doDispatch(
			RenderRequest renderRequest, RenderResponse renderResponse)
		throws IOException, PortletException {
        ...
	PortletMode portletMode = renderRequest.getPortletMode();

		if (portletMode.equals(PortletMode.VIEW)) {
			doView(renderRequest, renderResponse);
		}

在StrtutsPortlet.include方法中通过PortletRequestProcessor.process找到请求的具体实现Action

	public void process(
			RenderRequest renderRequest, RenderResponse renderResponse)
		throws IOException, ServletException {

		HttpServletRequest request = PortalUtil.getHttpServletRequest(
			renderRequest);
		HttpServletResponse response = PortalUtil.getHttpServletResponse(
			renderResponse);

		process(request, response);
	}

并通过该Action的execute将请求交给render方法处理。

		else if (portletRequest instanceof RenderRequest) {
			return render(
				mapping, form, portletConfig, (RenderRequest)portletRequest,
				(RenderResponse)portletResponse);
		}

Portlet action请求解析
1、请求经过MainServlet，再转交PortalRequestProcessor

默认交给LayoutAction，由LayoutAction 的processLayout根据判定是Action请求后再调用

			if (themeDisplay.isLifecycleAction()) {
				Portlet portlet = processPortletRequest(
					request, response, PortletRequest.ACTION_PHASE);

processPortletRequest方法创建invokerPortlet实例执行processAction方法。

if (lifecycle.equals(PortletRequest.ACTION_PHASE)) {
...
if (access) {
   invokerPortlet.processAction(
	actionRequestImpl, actionResponseImpl);
   actionResponseImpl.transferHeaders(response);
	    }

2、StrutsPortlet的processAction方法调用PortletRequestProcessor.process方法找到请求的具体实现 Action并调用其processAction方法

       PortletAction portletAction = (PortletAction)processActionCreate(
			request, response, actionMapping);
       ...
	portletAction.processAction(
		actionMapping, actionForm, portletConfigImpl, actionRequest,
				actionResponse);

3、若设置了actionResponse.sendRedirect(redirect)，执行完processAction方法后在LayoutAction的 processLayout方法还会将请求重定向到redirect，到此为止，一次action请求已经完成，同时发起一次render请求，跳转页面。

     	if (Validator.isNotNull(redirectLocation)) {
						   
           response.sendRedirect(redirectLocation);
           return null;
	}

由此可见LayoutAction在Liferay的请求解析中扮演着一个非常重要的角色。

Liferay Portal 请求过程解析

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