Reexecute processes from failed node

[maced...@gmail.com]

Hi Paul,

I'm using Sarasvati from some days by now, I think that would be useful a functionality that, if I'm not wrong, is not present in the current release.

If I'm wrong please correct me.

Suppose you have a graph whose execution process may fail in some node.

In some cases can be useful to reexecute the same process again starting from the node that failed(invoking engine.cancelProcess(token.getProcess()); ).

I'll try to extend the HibEngine class for introduce such a functionality, for my own purposes.

Maybe a more general approach would be a good enhancement for a future release.

Let me know.

Thank you,

   Pasquale.

[Paul Lorenz]

Ideally if a node execution fails, you should be able to try to fix whatever condition caused the error and then just re-invoke the node token complete.

If you've got another scheme in mind, happy to look at design and/or patches.

Cheers,

Paul

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[maced...@gmail.com]

Hi Paul,

I was thinking at a node implementation whose purpose is integrating with a third party component.

In such situation, if this integration fails, I think could be useful to reexecute the process starting from that node.

For identify a failed node I was thinking for searching records in the wf_node_token table whose complete_date is null.

Thank you,

   Pasquale.

Il giorno lunedì 10 giugno 2013 15:06:29 UTC+2, Paul Lorenz ha scritto:

Ideally if a node execution fails, you should be able to try to fix whatever condition caused the error and then just re-invoke the node token complete.

If you've got another scheme in mind, happy to look at design and/or patches.

Cheers,

Paul

On Fri, Jun 7, 2013 at 4:08 AM, <maced...@gmail.com> wrote:

Hi Paul,

I'm using Sarasvati from some days by now, I think that would be useful a functionality that, if I'm not wrong, is not present in the current release.

If I'm wrong please correct me.

Suppose you have a graph whose execution process may fail in some node.

In some cases can be useful to reexecute the same process again starting from the node that failed(invoking engine.cancelProcess(token.getProcess()); ).

I'll try to extend the HibEngine class for introduce such a functionality, for my own purposes.

Maybe a more general approach would be a good enhancement for a future release.

Let me know.

Thank you,

   Pasquale.

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[Paul Lorenz]

What I've done in the past is explicitly tracking failed operations.

So in your node execute method, you so something like

try

{ 

  // call external service

  engine.complete(token, Arc.DEFAULT_ARC); // won't get called if exception is thrown

}

catch(Exception e) // or whatever exception is appropriate

{

  notifyOfFailure(token);

}

The notifyOfFailure tracks the token and send a notification to the user, who can then see what happened and retry if appropriate.

Cheers,

Paul

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[khalil...@gmail.com]

Hi Paul,

How the user will do the retry from the failing node in a new process execution?

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