Dependencies of job chains implemented by events

One of the methods to implement dependencies between  job chains is using an event handler. 

Event service

Before events can be used the event service has to be installed. It is part of the JobScheduler installation if ordered within the installation procedure.

But it is also possible to install  the event service in an existing JobScheduler instance . For more information  have a look at  How to install the Event Service feature in JobScheduler

The job chain scheduler_event_service is running in predetermined intervals or whenever an event is created and checks all .xml data files in folder $SCHEDULER_DATA/config/events for information matching the active events which are stored in the data base table .