Node execution or rejection after delay

[EricS]

We want to use a workflow engine in Java for one of our projects. As was already noted in the forum, it has been quiet lately for Sarasvati development, but also for a lot of other workflow projects.
After some research, we think Sarasvati it still the better option, but it would need some basic functionilty such as execution or rejection of a node after a certain delay.
I did not find this option, but maybe there is some clever setting I missed? Can anybody help me?

Thanx, Eric

[Paul Lorenz]

Hmm, I have a couple of thoughts on how this could be supported. 

My current thinking is do the following.

1. Add a Retry GuardResult which will include the time to retry

2. Add support for Retry in Rubric (which already has some date support)

3. Add a built in predicate for isFirstGuardEval. Other predicates could use guardEvalCount.

4. Add an interface for a timer service, so users can plug in their timer service of choice

5. Provide a simple thread based timer service as a default

This would require adding some fields in wf_node_token: 

  guard_eval_count int not null, 

  next_guard_eval   timestamp

Timer service would look something like:

public interface TimerService

{

  void scheduleNodeTokenRetry(final NodeToken token)

}

BaseEngine would have a new method that could be overridden.

public TimerService getTimerService() { .. }

Usage:

<node type="node" name="delayedNode">

  <guard>IF isFirstGuardEval THEN retry at 1 hour after currentTime ELSE ACCEPT</guard>

</node>

<node type="node" name="delayedNode">

  <guard>IF shipmentReady 

             THEN Accept 

             ELSE IF tooManyEvals 

                      THEN Skip TimeOut 

                      ELSE retry at 1 day after currentTime 

  </guard>

</node>

Thoughts?

Cheers,

Paul

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[est...@ellipsis.nl]

Hi Paul,

Yesterday I downloadedthe latest version 2.0.1 and got it running with our code. Are your ideas already incorporated in this latest release, I seem to notice some changes in the datamodel which indicate this?

Eric

Op dinsdag 13 november 2012 02:01:22 UTC+1 schreef Paul Lorenz het volgende:

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[Paul Lorenz]

Yes, you can now have a guard which does something like

if needToDelay then delay until 5 minutes after myCondition else Accept.

I have a very simple scheduler built, but if you need something with persistence support and/or multi-node support you'll want to write your own.

See: http://sarasvati.googlecode.com/svn/java/tags/v2.0.1/sarasvati-parent/target/site/apidocs/com/googlecode/sarasvati/Engine.html#getDelayedTokenScheduler()

And

http://sarasvati.googlecode.com/svn/java/tags/v2.0.1/sarasvati-parent/target/site/apidocs/com/googlecode/sarasvati/DelayedTokenScheduler.html

I need to write this up at some point, but I wanted to get the release out first, since doc updates can take me a while :)

Let me know if you have any questions.

Cheers,

Paul

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[est...@ellipsis.nl]

Thanx for your quick reply, I will try to make some tests. Eric

Op woensdag 5 december 2012 14:59:46 UTC+1 schreef Paul Lorenz het volgende:

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