Synchronization between rules and timer handlers

[benya]

How does MyController handle rules and timers?
Do they execute operations from concurrent threads?
Should we worry about synchronization when scripts read/write repository variables?

Or all scripts are executed by a single thread and there are no concurrency issues?

[jkandasa]

@benya Rules and timers are running on different threads. When you fetch repository variable, it becomes your local reference, If you do change it will override existing value.

[benya]

@jkandasa We need some mechanism to prevent race condition.

[benya]

Is any <String, Object> map accessible to Groovy scripts?
It would be possible to store there generic objects and use them for synchronization.

[jkandasa]

@benya Do you face any issue with out Synchronization?

[benya]

@jkandasa said:

@benya Do you face any issue with out Synchronization?

I face potential issue in the following scenario:

• multiple PIRs tigger rule that reads/writes global variable and disables/enables timer
• timer reads global variable as well
• timer has counter=1 and self-disables when triggered

Therefore I need to synchronize access to the global variable and modifications of timer object.
Otherwise global variable and timer could be left in an unexpected state.