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Issue 11.4 ('Blackjack')
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Web Applications

Random Topics

Issue: 11.4 (July/August 2013)
Author: Paul Lefebvre
Author Bio: Paul Lefebvre is the Xojo Developer Evangelist. He has developed software professionally for almost 20 years and has been using Xojo and prior versions since 2001.
Article Description: No description available.
Article Length (in bytes): 6,036
Starting Page Number: 77
Article Number: 11411
Related Web Link(s):

http://docs.xojo.com/index.php/Third
http://demos.xojo.com/cgi-bin/orders/orders.cgi

Excerpt of article text...

This month, I jump around a bit with some random topics based on questions I've seen on the forum since Xojo was released.

Accessing Sessions from Threads

As users connect to your web application, a new session is created. In your app, you use the Session object to store and track session-specific information. As you might expect, every web page that appears is tied to a Session.

But there are some things that are not tied to a Session and one of these is Threads. When you create and start a Thread, the Thread has no direct reference to the Session that created it. This means it cannot access the Session object and it cannot access web pages. This may not be a problem if your thread is autonomous and is given all the information it needs.

But if you want the thread to access a Session or talk to a web page, you have to use a slightly different design.

One technique is to use the WebSessionContext class, but this is only needed in a very special case: when you need to access web pages using their implicit names from within the thread. And, unfortunately, WebSessionContext has not been completely reliable in the last couple of releases, so I recommend avoiding it.

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