How to programatically set HT expiration based on BPM process?

Question

Hi All,
I'm developing a BPM process with human tasks. Is there a way by which I can set the task to expire 35 days after the date the instance of the BPM process was spawned? I see within the task an option to set Expiration after a fixed number of days, but my scenario requires that I compare the current date with the date on which the instance of the BPM process was created and set to expire accordingly.
Is this achievable? If not directly are there any suggested programmatic approaches to achieve this?
JDev : 11.1.1.4
Thank you.
PP.

Answer 1

Don't know if you know how to get the number of days, hours, minutes that you want to wait and then put that into a either a string or integer variable (no decimals). If you know how to do this, then the code below should help. These examples assume you want to wait a certain number of days and this number is passed in using the variable "sla".
Setting the human task's deadline
The human task deadline timer can be set programmatically from a process variable using an XPath expression. In the human task's "Deadline" tab select "By Expression" from the dropdown. In the example below, the XPath expression would this if you had an string or integer variable called "Sla" and you wanted to set the number of days based on this variable:
concat("P0Y0M",/task:task/task:payload/task:Sla,"DT0H0M0.0S")
Setting the Interactive activity's deadline
You'll also want to set a boundary timer event on the Interactive activity set to the same duration. The syntax for this logic is different than the human tasks deadline. In the timer event, if you use the radio button "Time Date", the XPath expression to set the number of days based on a variable would be:
xp20:add-dayTimeDuration-to-dateTime(xp20:current-dateTime(),concat('P0Y0M'  ,bpmn:getActivityInstanceAttribute('SUBPROCESS3082641628371', 'inputDataItem')/ns:sLA,'DT0H0M0.0S'))If you instead select the timer event's "Time Cycle" radio button, the logic would be:
concat('P0Y0M',bpmn:getActivityInstanceAttribute('SUBPROCESS3082641628371', 'inputDataItem')/ns:sLA,'DT0HM0.0S')Dan