Activiti process with failover

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lstrzelecki

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 will start from last one serviceTask.
Q1: How force process to persist of actual serviceTask?
Q2: How resume to process after restart, which stuck in migrating from one serviceTask to next one?

jbarrez

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.