The AdsOptimization and Reporting bounded contexts are temporally coupled: they depend on a strict order of execution. The AdsOptimization component has to finish its processing before the Reporting module is triggered. If the order is reversed, inconsistent data will be produced in the Reporting system.

To enforce the required execution order, the engineers introduced the processing delay in the Reporting system. This delay of five minutes lets the AdsOptimization component finish the required calculations. Obviously, this doesn’t prevent incorrect order of execution:

• AdsOptimization may be overloaded and unable to finish the processing in five minutes.

• A network issue may delay the delivery of incoming messages to the AdsOptimi‐ zation service.

• The AdsOptimization component can experience an outage and stop processing incoming messages.