[COUCHDB-2561] Make config API consistent

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Component/s: Database Core
• Assignee: Ilya Khlopotov
• Reporter: Ilya Khlopotov
• Created: 29/Jan/15 20:09
• Updated: 27/Sep/16 15:52
• Resolved: 04/Feb/15 15:51

Description

There are 2 problems with API which need to be fixed.

1) Mix of message driven and callback driven
API for config_listener is hard to use.
In particular there is a gen_event_EXIT
message which is sent to the process which called config:listen_for_changes.
This makes API unsuitable for use in the context of a supervisor. Since supervisors do not support handling of arbitrary messages. This message also causing problems for test suite.
This message could be substituted with
a call to Module:handle_config_stop(Pid, Reason, State).
2) Since for section, key, value we only support lists but not arbitrary terms. More strick guards are needed to make sure the caller of the API fails with badarg

Issue Links

• links to: GitHub Pull Request #141