Component/Cron: init cron jobs via SetupAgent and Component's seek

[nhaagen]

Move registration of cron-jobs to component-level with contribute / seek and remove xml-based processor.
Construction of CronJobs is still an issue (as stated in the roadmap already); I circumvented this with an additional flag in __construct, which was the easiest to stay in the scope of this PR.

[klees]

Hi @nhaagen,

thanks a lot for looking into this. Looks promising afaic.

Please answer the following questions:

• hello world: Why do we want this change in hello_world.php?
• BookingManager: Why do we need this $registration construction? When would $registration = false?
• Metrics: Could you explain a little, what the metrics for the cronjobs will do?

Please consider the following suggestions. You do not need to follow those, but but please indicate shortly why you prefer to do otherwise:

• named objective: Lets publish ilCronjobsRegisteredObjective as a named objective too. People could then be really sure that all cronjobs are registered indeed...

I guess we should do one iteration before handing this over to @mjansenDatabay. Also: Please remember to open an according PR for the test plugin repo.

Kind regards!

[thibsy]

Hi @nhaagen,

I was curious about the integration mechanism here, so I briefly looked over the changes. I have some questions in addition to @klees' review - could you answer them as well?

• why do contributors of cron job instances need to prepend components\ to the component class name? Is this important or just an aesthetic? Would it make sense to centralise this?
• I was having an issue with ILIAS\Language\Language::loadLanguageModule() calls inside the constructor of classes during the migration of the UI framework initialisation ([FEATURE] UI: Implement initialisation using new component mechanism #7969). Did you not run into the same issue here?
• why are you using a "mock" instance of ILIAS\Language\Language inside the new cron objectives? Isn't there a dedicated implementation for the setup available?

Thx for your time!

kind regards,
@thibsy