Question

在我的一个GWT-Platform应用程序中，我面临一个奇怪的问题，当我在eclipse GWT插件中配置的jetty中运行应用程序并点击浏览器刷新当前页面成功加载（placeManager.getCurrentPlaceRequest（））但是当应用程序战争时部署在tomcat / jboss执行中，在当前位置请求的演示者的onBind（）方法之后停止并且不显示页面。

在处理刷新的过程中，第一次为该Presenter的GateKeeper的canReveal（）方法返回false，并且在服务器调用之后我再次显示当前位置，这导致canReveal（）方法返回true但是仍未显示该演示者。所以，我怀疑有些事情很棘手!!

有关这种行为的暗示吗？

以下是已实现的LoggedInGatekeeper的代码片段，它扮演一个关键角色：

public class LoggedInGatekeeper implements Gatekeeper {



private final EventBus eventBus;

private final DispatchAsync dispatcher;

private final PlaceManager placeManager;

private CurrentUser currentUser;

private boolean isUserLoggedOut;

private String lastPageAccessed;

@Inject
public LoggedInGatekeeper(final EventBus eventBus, final DispatchAsync dispatcher, final PlaceManager placeManager)
{
    this.eventBus = eventBus;

    this.dispatcher = dispatcher;

    this.placeManager = placeManager;

    this.eventBus.addHandler(LoginAuthenticatedEvent.getType(), new LoginAuthenticatedEventHandler()
    {
        @Override
        public void onLogin(LoginAuthenticatedEvent event)
        {
            currentUser = event.getCurrentUser();
            isUserLoggedOut = false;
        }
    });

    this.eventBus.addHandler(LogoutUserEvent.getType(), new LogoutUserEventHandler()
    {
        @Override
        public void onLogoutUser(LogoutUserEvent event)
        {
            SessionFactory.removeCookie(Constants.LAST_PAGE_ACCESSED);
            currentUser = null;
            isUserLoggedOut = true;
        }
    });
}

@Override
public boolean canReveal()
{
    Log.info("Browser fetched session cookie : " + Cookies.getCookie(Constants.JSESSION_COOKIE_KEY));

    if (Cookies.getCookie(Constants.JSESSION_COOKIE_KEY) == null)
    {
        SC.say("Your session is expired. Please login again");
        NavigateToLoginEvent.fire(eventBus);
        return false;
    }

    if (currentUser != null && !isUserLoggedOut)
    {

        lastPageAccessed = placeManager.getCurrentPlaceRequest().getNameToken();
        Log.info("canReveal() 1 : " + lastPageAccessed);
        SessionFactory.addCookie(Constants.LAST_PAGE_ACCESSED, lastPageAccessed);
        return currentUser.isLoggedIn();
    }
    else if (isUserLoggedOut)
    {
        Log.info("canReveal() 2 : User is logged out");
        NavigateToLoginEvent.fire(eventBus);
        return false;
    }
    else
    {
        Log.info("canReveal() 3 : Check on server for logged in user");
        dispatcher.execute(new FetchLoggedInUserAction(), new FetchLoggedInUserAsyncCallback());
        return true;
    }
}

class FetchLoggedInUserAsyncCallback extends MessageAsyncCallback<FetchLoggedInUserResult>
{
    /**
     * 
     */
    public FetchLoggedInUserAsyncCallback()
    {
        super("Loading...");
    }

    @Override
    public void doOnFailure(Throwable caught)
    {
        NavigateToLoginEvent.fire(eventBus);
    }

    @SuppressWarnings("unchecked")
    @Override
    public void doOnSuccess(FetchLoggedInUserResult result)
    {
        if (result == null)
        {
            Log.info("doOnSuccess() 1 : LoggedInUser not found on server");
            NavigateToLoginEvent.fire(eventBus);
        }
        else
        {
            Log.info("doOnSuccess() 2 : LoggedInUser found on server");
            if (result.getLoggedInUser() != null)
            {

                currentUser = new CurrentUser();
                currentUser.setMerchantConsoleUser(result.getLoggedInUser());

                SessionFactory.getClientSessionInstance().put(SessionKeys.LOGGED_IN_USER, result.getLoggedInUser());

                PlaceRequest currentPlaceRequest = placeManager.getCurrentPlaceRequest();

                Log.info("doOnSuccess() 3 : " + currentPlaceRequest.getNameToken());

                if (currentPlaceRequest != null)
                {   
                    placeManager.revealPlace(currentPlaceRequest);
                }
            }
            else
            {
                NavigateToLoginEvent.fire(eventBus);
            }
        }
    }
}


}

private final EventBus eventBus; private final DispatchAsync dispatcher; private final PlaceManager placeManager; private CurrentUser currentUser; private boolean isUserLoggedOut; private String lastPageAccessed; @Inject public LoggedInGatekeeper(final EventBus eventBus, final DispatchAsync dispatcher, final PlaceManager placeManager) { this.eventBus = eventBus; this.dispatcher = dispatcher; this.placeManager = placeManager; this.eventBus.addHandler(LoginAuthenticatedEvent.getType(), new LoginAuthenticatedEventHandler() { @Override public void onLogin(LoginAuthenticatedEvent event) { currentUser = event.getCurrentUser(); isUserLoggedOut = false; } }); this.eventBus.addHandler(LogoutUserEvent.getType(), new LogoutUserEventHandler() { @Override public void onLogoutUser(LogoutUserEvent event) { SessionFactory.removeCookie(Constants.LAST_PAGE_ACCESSED); currentUser = null; isUserLoggedOut = true; } }); } @Override public boolean canReveal() { Log.info("Browser fetched session cookie : " + Cookies.getCookie(Constants.JSESSION_COOKIE_KEY)); if (Cookies.getCookie(Constants.JSESSION_COOKIE_KEY) == null) { SC.say("Your session is expired. Please login again"); NavigateToLoginEvent.fire(eventBus); return false; } if (currentUser != null && !isUserLoggedOut) { lastPageAccessed = placeManager.getCurrentPlaceRequest().getNameToken(); Log.info("canReveal() 1 : " + lastPageAccessed); SessionFactory.addCookie(Constants.LAST_PAGE_ACCESSED, lastPageAccessed); return currentUser.isLoggedIn(); } else if (isUserLoggedOut) { Log.info("canReveal() 2 : User is logged out"); NavigateToLoginEvent.fire(eventBus); return false; } else { Log.info("canReveal() 3 : Check on server for logged in user"); dispatcher.execute(new FetchLoggedInUserAction(), new FetchLoggedInUserAsyncCallback()); return true; } } class FetchLoggedInUserAsyncCallback extends MessageAsyncCallback<FetchLoggedInUserResult> { /** * */ public FetchLoggedInUserAsyncCallback() { super("Loading..."); } @Override public void doOnFailure(Throwable caught) { NavigateToLoginEvent.fire(eventBus); } @SuppressWarnings("unchecked") @Override public void doOnSuccess(FetchLoggedInUserResult result) { if (result == null) { Log.info("doOnSuccess() 1 : LoggedInUser not found on server"); NavigateToLoginEvent.fire(eventBus); } else { Log.info("doOnSuccess() 2 : LoggedInUser found on server"); if (result.getLoggedInUser() != null) { currentUser = new CurrentUser(); currentUser.setMerchantConsoleUser(result.getLoggedInUser()); SessionFactory.getClientSessionInstance().put(SessionKeys.LOGGED_IN_USER, result.getLoggedInUser()); PlaceRequest currentPlaceRequest = placeManager.getCurrentPlaceRequest(); Log.info("doOnSuccess() 3 : " + currentPlaceRequest.getNameToken()); if (currentPlaceRequest != null) { placeManager.revealPlace(currentPlaceRequest); } } else { NavigateToLoginEvent.fire(eventBus); } } } }

先谢谢。

Answer 1

神秘透露，在onBind（）方法中添加了以下代码，浏览器刷新开始按预期在所有环境中工作。这似乎是一个模糊的行为框架，其中GateKeeper尝试从服务器获取数据，此时主持人的可见性被设置为假，这同样的想法导致我编写以下代码并且它起作用，希望来自GWT-P的人可以看看在这篇文章中想到处理这种情况的正确方法：

/**
     * This piece of code takes care of revealing page on browser refresh event.
     * On browser refresh somehow visibility of page is set to false, so, we need to manually fire the reveal content event.
     */
    if(this.getProxy().canReveal() == true && !this.isVisible()){
                revealInParent();
    }

GWT-Platform：在tomcat / jboss上部署应用程序时，不会在浏览器刷新时调用onReveal（）方法

1 个答案: