topic Persistance race condition in Alfresco Archive https://connect.hyland.com/t5/alfresco-archive/persistance-race-condition/m-p/131412#M92332 <HTML><HEAD></HEAD><BODY><SPAN>Hi,</SPAN><BR /><BR /><SPAN>&nbsp; We are using Activiti in perhaps a very different way and running into some problems.&nbsp; Our app is distributed across multiple servers, connected by a message queue.&nbsp; A single server runs an embedded version of Activiti.&nbsp; When the workflows hit a particular custom task, we post a message to the message queue inside a subclass of TaskActivityBehavior (but the problem shows up using JavaDelegate as well).&nbsp; Another server picks up the message and does some processing and sets a variable on the workflow like this:</SPAN><BR /><BR /><PRE class="language-none line-numbers"><CODE>&nbsp;&nbsp;&nbsp; runtimeService.setVariable(request.executionId, "SeriesObject", seriesObject);<BR /><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN></CODE></PRE><BR /><SPAN>Depending on the timing, the call to setVariable may throw an exception because the workflow (running on a different machine), may not have persisted the execution to the database yet.&nbsp; Sometimes it works just fine.</SPAN><BR /><BR /><SPAN>My question: how should we handle this problem?&nbsp; Can we/should we</SPAN><BR /><UL>1. force the workflow to persist before we send the message to the message queue?</UL><UL>2. use Activiti's transaction manager to make sure the message is sent only after the workflow is persisted?</UL><UL>3. have a callback to know when Activiti persists the execution?</UL><UL>4. delay the send until the workflow is persisted? (Don't like this option, would be a spin lock)</UL><SPAN>Thanks!</SPAN><BR /><SPAN>-dan</SPAN></BODY></HTML> Fri, 07 Dec 2012 15:34:14 GMT blezek 2012-12-07T15:34:14Z Persistance race condition https://connect.hyland.com/t5/alfresco-archive/persistance-race-condition/m-p/131412#M92332 Hi,&nbsp; We are using Activiti in perhaps a very different way and running into some problems.&nbsp; Our app is distributed across multiple servers, connected by a message queue.&nbsp; A single server runs an embedded version of Activiti.&nbsp; When the workflows hit a particular custom task, we post a message to the Fri, 07 Dec 2012 15:34:14 GMT https://connect.hyland.com/t5/alfresco-archive/persistance-race-condition/m-p/131412#M92332 blezek 2012-12-07T15:34:14Z Re: Persistance race condition https://connect.hyland.com/t5/alfresco-archive/persistance-race-condition/m-p/131413#M92333 <HTML><HEAD></HEAD><BODY><SPAN>Personally I think two is the best. It is the most natural way and the way transactios are meant to be used.</SPAN></BODY></HTML> Fri, 07 Dec 2012 16:52:36 GMT https://connect.hyland.com/t5/alfresco-archive/persistance-race-condition/m-p/131413#M92333 ronald_van_kuij 2012-12-07T16:52:36Z Re: Persistance race condition https://connect.hyland.com/t5/alfresco-archive/persistance-race-condition/m-p/131414#M92334 <HTML><HEAD></HEAD><BODY><BLOCKQUOTE class="jive-quote">Personally I think two is the best. It is the most natural way and the way transactios are meant to be used.</BLOCKQUOTE><BR /><SPAN>Agreed.&nbsp; Can you point out where I can grab the current transaction from within a JavaDelegate?</SPAN><BR /><BR /><SPAN>Thanks!</SPAN><BR /><SPAN>-dan</SPAN></BODY></HTML> Fri, 07 Dec 2012 17:02:43 GMT https://connect.hyland.com/t5/alfresco-archive/persistance-race-condition/m-p/131414#M92334 blezek 2012-12-07T17:02:43Z Re: Persistance race condition https://connect.hyland.com/t5/alfresco-archive/persistance-race-condition/m-p/131415#M92335 <HTML><HEAD></HEAD><BODY><SPAN>Seems that </SPAN><A href="http://do-on-it.blogspot.com/2012/02/spring-database-transactions-before.html" rel="nofollow noopener noreferrer">this post [1]</A><SPAN> was key to helping me out…</SPAN><BR /><BR /><SPAN>Thanks for the tips!</SPAN><BR /><SPAN>-dan</SPAN><BR /><BR /><BR /><SPAN>[1] </SPAN><A href="http://do-on-it.blogspot.com/2012/02/spring-database-transactions-before.html" rel="nofollow noopener noreferrer">http://do-on-it.blogspot.com/2012/02/spring-database-transactions-before.html</A></BODY></HTML> Fri, 07 Dec 2012 18:19:26 GMT https://connect.hyland.com/t5/alfresco-archive/persistance-race-condition/m-p/131415#M92335 blezek 2012-12-07T18:19:26Z