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Eclipse RAP - UI-Session vs Http-Session [message #1752405]

Mon, 23 January 2017 08:06

Eclipse User

As far as I know, the UI-Session changes with each browser refresh whereas the Http-Session has the same identifier, even after a browser refresh.

Can anyone explain me what the diffrence between an Http-Session and UI-Session is?

Thanks in advance!
Best regards,
Nazar Medeiros

Re: Eclipse RAP - UI-Session vs Http-Session [message #1752598 is a reply to message #1752405]

Wed, 25 January 2017 09:33

Eclipse User

Hi,
the RAP UISession is kept inside HTTPSession. As multiple browser tabs share the same HTTPSession, you can have more than one UISession (different RAP applications in every browser tab) inside one HTTPSession. See also [1].

[1] https://www.eclipse.org/rap/developers-guide/devguide.php?topic=scopes.html&version=3.1#uisession

Regards,
Ivan

Re: Eclipse RAP - UI-Session vs Http-Session [message #1752608 is a reply to message #1752598]

Wed, 25 January 2017 10:19

Eclipse User

Put this example code at the start of your first MPart to understand the concept of UISession and HttpSession

public void testApplicationContext(Shell shell){
	String sessionInfo = "";
	sessionInfo = RWT.getApplicationContext().toString()+"\n";
	sessionInfo += RWT.getClient().toString()+"\n";
	sessionInfo += RWT.getUISession().toString()+"\n";
	sessionInfo += RWT.getUISession().getHttpSession().toString()+"\n";
	System.out.println(sessionInfo);
	MessageDialog.openInformation(shell,"Session info",sessionInfo);
}

[Updated on: Wed, 25 January 2017 10:20] by Moderator

Re: Eclipse RAP - UI-Session vs Http-Session [message #1752870 is a reply to message #1752608]

Mon, 30 January 2017 02:49

Eclipse User

Thanks for your help bros!

I appreciate your time =)

But to be honest.. I did not get the purpose of the UI-Session. Is this really necessary?

Aziz Hohenheim

[Updated on: Mon, 30 January 2017 02:55] by Moderator

Re: Eclipse RAP - UI-Session vs Http-Session [message #1752877 is a reply to message #1752870]

Mon, 30 January 2017 03:48

Eclipse User

If your website displays the same information no matter what the user is doing you don't need that.
If not, you need a user-instance session (UISession). It is most needed if you have to manage Singleton Java objects that can be shared within MParts.

Re: Eclipse RAP - UI-Session vs Http-Session [message #1752951 is a reply to message #1752877]

Tue, 31 January 2017 03:50

Eclipse User

Hmm.. Sorry, I still did not get it Sad

For example:
I have a table displayed on the UI, which contains user information like firstname, lastname etc. The user is able to filter the table by entering a search string into a text field.

So I guess I need an UI-Session here because, I won't display always the same information. But what is exactly the task of the UI-Session?

Best regards,
Aziz

Re: Eclipse RAP - UI-Session vs Http-Session [message #1752955 is a reply to message #1752951]

Tue, 31 January 2017 04:54

Eclipse User

In fact the UISession and HTTPSession are really needed if you have java objects exchanged between MParts. I mean like "persistent" object, which is created at one point by the user and kept during his navigation.

For example, I have what we call a Singleton with some objects inside: String, int, ArrayList<String>,... These are created when the website open and kept until the user kill his session. If I put this Singleton in HttpSession, the objects will be shared by all users. If I put it in UISession, each user will have a different instance of these Singleton.

The best way to understand object creation and destruction is to install a local version of Apache Tomcat and screen the objects it creates using a software like JVM Memory Analyzer. Run your website, open two navigator (ex: Chrome and Firefox) and look how much objects have been instanciate in the JVM.

Good luck Smile

Re: Eclipse RAP - UI-Session vs Http-Session [message #1752956 is a reply to message #1752955]

Tue, 31 January 2017 05:14

Eclipse User

Ah.. Now I understand. =) =) =)

Thanks a lot!!!

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