Leveraging activity-chaining

Question

Hi everyone, 
 Hope everyone is doing well and safe. 
 
 Can any one help me with Leveraging activity-chaining with example.? 
 How can we pass data from one process to other process by using start process smart service? 
 Thank you all in advance! 
 Regards, 
 Kiran Sajjan

Peter Lewis · Accepted Answer

Interestingly it is technically still valid to use a form on any node that allows it (including nodes that aren't User Input Tasks). If you do this, it will correctly generate a task that is visible in the tasks feed, and it can be completed and save outputs just like a user Input Task. 
 However, there are a few reasons why almost no one does this in practice: 
 
 Saving data is a bit strange. In most cases you want to guarantee that one activity occurs before another (e.g. saving the data on a form occurs before starting a process). However, since activity class parameters are evaluated in parallel, this isn't guaranteed to happen. It's usually much better to separate out the User Input Task ahead of the next node to guarantee the order of operations. 
 Debugging is also harder if you combined everything together into a single node, as the process history can't provide granular enough detail to give context for what occurred within a node. 
 
 For those reasons, it's best practice to not use the Forms tab within any node except for User Input tasks.

Harshit Bumb (Appyzie) · Answer

Start process smart service is used as an alternative for the Async Sub process. It also provides the flexibility to not create dependency on a process dependents/precedents rather it asynchronously starts a process model, hence also taking care of the load balancing. If you want to open two forms, one after another, without falling out, you can use a sub-process synchronously and add activity chaining. 
 Chaining is used to run the chained nodes on a single engine. In a normal language, It helps you jump between two or more forms without falling out but increases the engine load. This is the reason why we have a limit of 50 for chained nodes.

erikb0001 · Answer

Hi Kiran, 
 If you mean how to get data output returned from the proces initiated via the start process smart service you have to use activity chaining in the child right from the first node. The parent will wait for the last chained node in the child to finish before the parent proceeds to the next node. This way the behavior of the start process smart service is kind of synchronize and you will be able to fetch the output of the child process in the node's that follow after the start process smart service node. the pv's of the child are returned in a array of pv's. To initiate the child process via start process smartservice in via a dictionary with the data regarding to the parameters of the child process to be started. If you don't chain the nodes in the child the pv's will be null if you fetch them in the next node because default behavior is async, so the next node in the parent will not get updated data in the child because it executed before the child was finished with updating the data. 
 Regards, 
 Erik

Leveraging activity-chaining

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