how to interrupt an xquery programmaticaly ?

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1

hello all,

i’m trying to implement a cancel function in my java client in order to allow a user to cancel a search when it takes too long. I have encapsulated all the process of connecting + querying + getting the results in a thread called from my client. So i check between each step if the thread has been interrupted.
Unfortunately, once the step TResponse response = accessor.xquery(query,PAGE_SIZE); has been launched (and it’s often the longest step), i’m forced to wait the end of it before being able to treat the cancelling.
Does it exist a way to be informed of something during this method is running ? How can i do that ?

thanks in advance for any lead.

thomas

ps : it’s maybe more a java question than a tamino one, but on doesn’t know. Maybe someone has already implemented something like that here…

2

With Tamino v4.4 it is possible to cancel a request. See ino:Accessor in the “Requests using X-Machine Commands” chapter of the Tamino documentation.

If the request takes a long time to fetch data but you want the client to have control whilst waiting for the results then you could utilise techniques such as Ajax.

Hope this helps.

3

thanks Stuart for the quick answer,

unfortunately i’m working with tamino 4.2.1. Do you know if cancel is possible with this version ?

what do you mean by “techniques such as Ajax”, is it something easy to build (i’m programming a swing client for only one user at a time, and i’m not really an “up to date” programmer…)

thomas

4

unfortunately i’m working with tamino 4.2.1. Do you know if cancel is possible with this version ?

don’t need to answer : i just found the release note for 4.4.1 that says “Currently it is not possible to stop requests sent to Tamino through the Tamino API for Java. Once started, a query executes (i.e., consumes CPU cycles, main memory, and IO capacity) until all results are delivered or until an error condition is encountered. The user has no chance to cancel a long running request (and thus stop resource consumption).
In the current version of Tamino (i.e. 4.4.1), the server provides this feature. Application-owned requests can be cancelled using the Tamino API for Java.”

thomas