Hello:
I am a newbie to GWT. I am developing an app (without MVP). The app
has a login page and a welcome page. I am using the Entry Point class
itself as my Event listener and History ValueChangeHandler. The
scenario is as follows, when the user launches the URL the system
first validates if there is a session active for the user, if the
session is active the Welcome page is displayed. If no session is
active the Login Page is displayed and if the user enters valid
credentials the welcome page is displayed. The issue is that if a
session is already running the welcome page never gets displayed.
Code snippets are as follows:
public class MainApp implements EntryPoint, AsyncCallback<String>,
EventHandler, ValueChangeHandler {
/**
* This is the entry point method.
*/
private SessionContext session = new SessionContext();
public void onModuleLoad() {
//validateSession();
Log.warn("onModuleLoad()");
initHistory();
}
private void initHistory() {
String token = History.getToken();
Log.warn("initHistory()" + token);
History.addValueChangeHandler(this);
if (token.length() == 0) {
onHistoryChange(Event.DISPLAY_LOGON.toString());
} else {
onHistoryChange(token);
}
}
private void onHistoryChange(String token) {
Log.warn("onHistoryChange() - token :" + token);
if (token.equals(Event.DISPLAY_LOGON.toString())
||
token.equals(Event.LOGON_SUCCESSFUL.toString())) {
validateSession();
}
}
@Override
public void onFailure(Throwable caught) {
Log.warn("Validate Session Failed !!");
this.showLogonView();
}
@Override
public void onSuccess(String result) {
Log.warn("Validate Session successful - sessionId : " + result);
this.showWelcomeView();
}
private void showWelcomeView() {
Log.warn("showWelcomeView()");
Log.warn("SessionId: " +
session.getSessionDetails().getSessionId().toString());
HomeView homeView = new HomeView(this, session);
WelcomeHeaderView headerView = new WelcomeHeaderView(this,
session);
WelcomeMenuView menuView = new WelcomeMenuView(this, session);
RootLayoutPanel.get().clear();
Integer count = (Integer)RootLayoutPanel.get().getWidgetCount();
Log.warn("After Clear: " + count.toString());
RootLayoutPanel.get().add(homeView);
homeView.headerPanel.add(headerView);
homeView.leftPanel.add(menuView);
count = (Integer)RootLayoutPanel.get().getWidgetCount();
Log.warn("After Add: " + count.toString());
History.newItem(Event.LOGON_SUCCESSFUL.toString());
}
private void showLogonView() {
Log.warn("showLogonView()");
HomeView homeView = new HomeView(this, session);
LoginView loginView = new LoginView(this, session);
RootLayoutPanel.get().clear();
RootLayoutPanel.get().add(homeView);
homeView.mainPanel.add(loginView);
History.newItem(Event.DISPLAY_LOGON.toString());
}
private void validateSession() {
LogonAndRegistrationServiceAsync logonAndRegistrationService =
GWT
.create(LogonAndRegistrationService.class);
String sessionId = Cookies.getCookie("sid");
logonAndRegistrationService.checkSession(sessionId, this);
}
}
When there is no session active, the login View gets displayed
correctly and when valid credentials are provided the WelcomeView is
displayed correctly. However when a session is already active (and
when I switch on the GWT-Log) I can see that the showWelcomeView()
gets invoked, but the subsequent Log entries are not shown and looks
like the rest of the code is not getting executed. The call stack from
the GWT Log is shown below:
(-:-) 2010-06-05 22:28:12,633 [WARN ] onModuleLoad()
(-:-) 2010-06-05 22:28:12,635 [WARN ] initHistory()LOGON_SUCCESSFUL
(-:-) 2010-06-05 22:28:12,635 [WARN ] onHistoryChange() -
token :LOGON_SUCCESSFUL
(-:-) 2010-06-05 22:28:12,993 [WARN ] Validate Session successful -
sessionId : Session Valid
(-:-) 2010-06-05 22:28:12,995 [WARN ] showWelcomeView()
Any ideas as to what is going wrong here ?
Thanks a lot.
Best regards
Venki
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