It may be silly for some but I am having a lot of trouble modelling with what i think is not a complex diagram. Please help me model this, a simple drawing would help
Start task by user
Then Task 1 and Task2 are available for some to do them,
After Task 1 is completed I need to send a mail and in case of error sending the mail i need to retry every 6 hours.
Task3 requires Task1 and Task2 done.
Other Specifications: I do not know if Task1 runs before than Task2 so i think it can't be made by throwing signals or events...