The module CacheInvalidator was disabled 2015 by the commit
https://github.com/serlo/athene2/commit/8258e804bb0f963ea3a394c31b5fd919c39d3759
and was not reused afterwards. Thus we can remove this module since
there are currently no listener in this module active. Since cache_listener does not exists the list $options is empty:
The module CacheInvalidator was disabled 2015 by the commit https://github.com/serlo/athene2/commit/8258e804bb0f963ea3a394c31b5fd919c39d3759 and was not reused afterwards. Thus we can remove this module since there are currently no listener in this module active. Since
cache_listenerdoes not exists the list$optionsis empty:https://github.com/serlo/serlo.org/blob/b142eb5dfa1d85991dd51efff46c3d7536f95695/packages/public/server/src/module/CacheInvalidator/src/Factory/CacheOptionsFactory.php#L33-L37
This results in
CacheOptions->getListen()to be empty: https://github.com/serlo/serlo.org/blob/b142eb5dfa1d85991dd51efff46c3d7536f95695/packages/public/server/src/module/CacheInvalidator/src/Options/CacheOptions.php#L32Thus no listener are activated: https://github.com/serlo/serlo.org/blob/b142eb5dfa1d85991dd51efff46c3d7536f95695/packages/public/server/src/module/CacheInvalidator/src/Listener/CacheListener.php#L67-L82
I have not found a usage outside this module.