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From "Dmitri Blinov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (JEXL-255) Ability to continue interrupted scripts
Date Mon, 05 Mar 2018 06:29:00 GMT

    [ https://issues.apache.org/jira/browse/JEXL-255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16385649#comment-16385649
] 

Dmitri Blinov commented on JEXL-255:
------------------------------------

The test code I'm using is like this
{code}
@timeout(5) {sleep(10000); return 0}; return 42
{code}
At the moment the code returns neither 0 nor 42, but throws {{JexlException.Cancel}}
The {{Context.processAnnotation()}} code correctly catches {{JexlException.Cancel}}
exception that was thrown during {{sleep()}} invocation, and then returns null, since it was
a timeout; The script nevertheless throws {{JexlException.Cancel}}
at the end, once again.


> Ability to continue interrupted scripts
> ---------------------------------------
>
>                 Key: JEXL-255
>                 URL: https://issues.apache.org/jira/browse/JEXL-255
>             Project: Commons JEXL
>          Issue Type: Improvement
>    Affects Versions: 3.1
>            Reporter: Dmitri Blinov
>            Assignee: Henri Biestro
>            Priority: Major
>             Fix For: 3.2
>
>
> I'm trying to implement the {{@timeout}} annotation that should work like the following
> {code:java}
> @timeout(15000) { return longrunningcall(); }
>  {code}
> The idea is to protect part of the script code from being executed indefinitely or more
than allowed by business rules. The script should continue its evaluation after the {{@timeout}}
annotation regardless of whether the timeout has taken place or not.
> There is a straightforward implementation that starts guarding thread which should invoke
{{Thread.interrupt()}} for the thread executing the script. The {{InterruptedException | JexlException.Cancel}}
is then caught and swallowed inside the {{processAnnotation()}} method, and if the guard thread
has fired, which means the timeout occured, the {{null}} value is returned.
> I expected the script to continue its evaluation after the exception is processed inside
{{processAnnotation()}} code, but the script nevertheless throwed {{JexlException.Cancel}}
as a result. The suggestion is to allow script to continue its evaluation once {{InterruptedException}}
or {{JexlException.Cancel}} is processed. 



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