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Home » Eclipse Projects » Remote Application Platform (RAP) » How to terminate the UI thread(As we all know, in RAP application, the UI thread will be created after user login successfully, when refresh the browser, a new UI thread will be created, this will cause DOS due to high usage of CPU)

How to terminate the UI thread [message #1760631]

Sat, 29 April 2017 04:00

Eclipse User

Hi all,

As we all know, in RAP application, the UI Thread will be created after user login successfully, this is Daemon Thread.

But a new UI Thread will be created when user refresh the browser.

If the hacker send many time requests, it will create many UI Threads and will cause DOS due to high usage of CPU and memory.

Thanks

Re: How to terminate the UI thread [message #1760652 is a reply to message #1760631]

Sun, 30 April 2017 05:58

Eclipse User

There are many ways to terminate the UIThread:
Expire the HTTP session.
Remove the UISession from the HTTP session.
Let the EntryPoint#createUI method finish
Throw a ThreadDeath exception in the UIThread

I'm sure there's more but that's just off the top of my head

Re: How to terminate the UI thread [message #1760695 is a reply to message #1760652]

Tue, 02 May 2017 02:30

Eclipse User

Thanks for your reply.

I have found the reason, when refresh the browser, cid which UI session depends on will change, and cid generate from _generateConnectionId function of client.js. I think I can control the cid on server side to make sure unique value per session.

My Rap version is 2.2.0.

Thanks again.

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