AT:

• ensure that exclusive jobs can only acquire once

Use Case

• multiple job executors (JE1, JE2)
• multiple exclusive jobs for same process instance (J1, J2)
• parallel job acquirement (two queries: findNextJobsToExecute + findExclusiveJobsToExecute)
• JE1 > findNextJobsToExecute = J2 (J1 is locked)
• JE1 > findExclusiveJobsToExecute = J2
• JE2 > findNextJobsToExecute = J1 + J2 (J1 rolled back)
• JE2 > findExclusiveJobsToExecute = J1 (J2 is already locked)
• JE2 > findExclusiveJobsToExecute = J1 (J1 is added twice)