Re: [Exist-development] [Exist-commits] SF.net SVN: exist:[12622] trunk/eXist/src/org/exist/xquery/functions/util/ Eval.java

[Joe W. <jo...@gm...>]

Hi Adam and Dmitriy,

A similar function exists in MarkLogic, xdmp:spawn().  For your
reference/discussion:

http://developer.marklogic.com/pubs/4.1/apidocs/Ext-6.html#xdmp:spawn

Joe


On Wed, Sep 1, 2010 at 11:33 AM, Adam Retter <ad...@ex...> wrote:
> NO it cant - because the callback function is in the original compiled
> xquery and not the xquery executed by the new thread. By time the new
> thread finishes executing there is no guarantee that the original
> xquery has not finished executing and been discarded (the callback
> function along with it)!
>
> On 1 September 2010 16:32, Dmitriy Shabanov <sha...@gm...> wrote:
>> It can be same thread:
>>
>> run() {
>>
>>   fire-start-event() //through call-back function
>>   //function body
>>   //it can have functions to send event through call-back function
>>
>>   fire-end-event() //through call-back function
>> }
>>
>> On Wed, 2010-09-01 at 16:23 +0100, Adam Retter wrote:
>>> Problem with a callback is that it would itself have to be another
>>> thread, as by this point the main XQuery may have finished executing
>>> and been cleaned up. So I dont really see that it gives you anything
>>> else, as you get the thread id anyway, and if we add further functions
>>> in future you could use these to monitor, cancel thread execution.
>>>
>>> On 1 September 2010 16:21, Evgeny Gazdovsky <gaz...@gm...> wrote:
>>> > run anything after thread will be finished, possible pass into callback the
>>> > results of thread
>>> >
>>> > 2010/9/1 Adam Retter <ada...@go...>
>>> >>
>>> >> What is the purpose of the callback?
>>> >>
>>> >> On 1 September 2010 14:51, Evgeny Gazdovsky <gaz...@gm...> wrote:
>>> >> > what about more common async function, like
>>> >> > util:async($any-code, $callback-function)?
>>> >> > So we can use one like:
>>> >> > declare function:local:calback($thread-id){
>>> >> > .....
>>> >> > };
>>> >> > util:asynk(
>>> >> >      (any code here, like at system:run-as())  ,
>>> >> >       util:function("local:callback",1)
>>> >> > )
>>> >> >
>>
>> --
>> Cheers,
>>
>> Dmitriy Shabanov
>>
>
>
>
> --
> Adam Retter
>
> eXist Developer
> { United Kingdom }
> ad...@ex...
> irc://irc.freenode.net/existdb
>
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