Problem
- Notification does not happen once after final commit, but for every plugin
- Problems in spec plugin
These problems can be traced back to the placement of the plugins. We need to cleanup and simplify the placement.
Constraints
- Plugin interface should be the same. Many plugins, e.g. dbus, should work as global plugins w/o any change in code (i.e. only changes in contract)
- Global plugins might depend on specific applications or specific mount points (it should be possible to enforce global plugins for specific applications).
Assumptions
- Elektra is useful with following types of global plugins:
- mmap
- spec
- gopts
- receiving of notifications (internalnotification)
- sending of notifications (dbus, ...)
- There are not too many types of global plugins, not more than 10
Considered Alternatives
- generic placements like /prerollback /rollback /postrollback /getresolver /pregetcache /pregetstorage /getstorage /postgetstorage /postgetcache /setresolver /presetstorage /setstorage /precommit /commit /postcommit which can be executed at: /init /deinit /foreach proved to be too complicated and untestable.
Decision
Have hooks and API specific to the list of global plugins in assumptions. These hooks are not shared, so no list plugin is needed.
Installed plugins will be used.
Rationale
- allows adding more types of plugins later, also post-1.0
- much clearer semantics for each type, no need to compromise
- easier to implement
Implications
- remove
global-mount command
- command for mmap/notification/... enable disable (like current
kdb cache tool)
- remove
list plugin
- remove plugins that stop working or disallow global positioning for them
- call
spec as needed several times
Related Decisions
Notes
