Advanced Modelling Features
Interrupts
The Model Trace
Let us now take a look at the trace output of this example to see how interrupting a process's execution works. We start at simulation time 29.2158 where the van carrier finishes loading Truck#6 and starts service on Truck#7. Note that the end of service (the hold()) is scheduled to happen at 35.4954. At simulation time 31.6672 though, the first urgent truck (Truck#17) arrives and interrupts VanCarrier#1. The van carrier then inserts the truck it is currently serving (Truck#7) back into the truck queue and immediately starts service on the urgent Truck#17 until simulation time 36.3058.
In the meantime, two more trucks arrive and wait in line. When the van carrier has finished service for the urgent truck it resumes servicing Truck#7 whose service got interrupted. This shows that we implemented the service order correctly.
InterruptsExampleExperiment - Trace
model | time | event | entity | action(s) |
| InterruptsExample | 0.0 | TraceOn#1 | ---- | Trace switched on |
| ... | ... | ... | ||
| 29.2158 | VanCarrier#1 | activates 'Truck#6' now | ||
| removes Truck#7 from 'Truck Queue' | ||||
| inserts itself into 'busy VC Queue' | ||||
| holds for 6.2796 until 35.4954 | ||||
| Truck#6 | Truck was serviced and leaves system. | |||
| Truck#6 terminates | ||||
| 31.6672 | TruckArrival#1 | activates 'Truck#17' after 'TruckArrival#1' | ||
| Truck#17 | TruckQueuelength: 10 | |||
| removes VanCarrier#1 from 'busy VC Queue' | ||||
| interrupts 'VanCarrier#1', with reason Urgent Truck Arrived [1] | ||||
| passivates | ||||
| VanCarrier#1 | interrupted! | |||
| inserts Truck#7 into 'Truck Queue' | ||||
| removes Truck#17 from 'Truck Queue' | ||||
| inserts itself into 'busy VC Queue' | ||||
| holds for 4.6386 until 36.3058 | ||||
| 32.4497 | TruckArrival#1 | activates 'Truck#18' after 'TruckArrival#1' | ||
| Truck#18 | TruckQueuelength: 11 | |||
| passivates | ||||
| 35.4435 | TruckArrival#1 | activates 'Truck#19' after 'TruckArrival#1' | ||
| Truck#19 | TruckQueuelength: 12 | |||
| passivates | ||||
| 36.3058 | VanCarrier#1 | activates 'Truck#17' now | ||
| removes Truck#7 from 'Truck Queue' | ||||
| inserts itself into 'busy VC Queue' | ||||
| holds for 4.5527 until 40.8586 | ||||
| Truck#17 | Truck was serviced and leaves system. | |||
| Truck#17 terminates |
You may download the full source code of this example if you want to try it out yourself.