topic Re: Activiti process with failover in Alfresco Archive

Activiti process with failover

lstrzelecki — Mon, 14 Mar 2011 23:01:58 GMT

Hi, I'm evaluating activiti. At start I have requirement of failover. So I ask first.I have process with chain of serviceTasks (spring beans, which invoke external systems). I want save state of process while walk through every serviceTask in process. When process will be loaded after restart it wil

Re: Activiti process with failover

jbarrez — Tue, 15 Mar 2011 09:23:26 GMT

The functionality you need for this is called 'async continuations', which we havent implemented yet. By putting an async continuation on each of the service tasks, whenever an error occurs, the process will be persisted with as current state the last successful service task.

A current workaround to implement async continuations, is to use a combination of wait states + a queue that signals back to the process.
So each service task is then a 'receive task + service task'. When the receive task is reached, send out a message to a queueu. The process instance is now persisted. Upon arrival of the message in the queue, send a 'signal' back to the process instance using the execution id of the wait state. That matches exactly the behavior you want.

Re: Activiti process with failover

lstrzelecki — Tue, 15 Mar 2011 22:26:46 GMT

Thanks for quick reply.
I will try workaround, nevertheless i have question about:
http://jira.codehaus.org/browse/ACT-126
Is there any plans to implement that, in close future? Any road map? For me it is critical, becouse every invoke of external service (spring bean in servcie task) could be done once.

Re: Activiti process with failover

ronald_van_kuij — Wed, 16 Mar 2011 07:34:51 GMT

Is there any plans to implement that, in close future? Any road map?

Yes there is.. In the community section… Searching for it is another option to see if it is there

Re: Activiti process with failover

mproch — Wed, 16 Mar 2011 09:03:43 GMT

Well, if you talk about:
http://docs.codehaus.org/display/ACT/Roadmap
I think it hasn't been updated for a while

Re: Activiti process with failover

ronald_van_kuij — Wed, 16 Mar 2011 10:33:57 GMT

I think it hasn't been updated for a while

That seems to be true and a valid point, but never the less he could (should) have found it himself.

Re: Activiti process with failover

lstrzelecki — Thu, 17 Mar 2011 16:46:16 GMT

That seems to be true and a valid point, but never the less he could (should) have found it himself.

Thats true, my mistake, sorry.