Cool! I'll work that into my charms tomorrow. Might as well go all out on the new stuff ;)
Tom On 17 Feb 2016 18:48, "Marco Ceppi" <marco.ce...@canonical.com> wrote: > This is awesome, glad to see this wrapped in the reactive framework. Will > make a lot of my layers much simpler! > > Marco > > On Wed, Feb 17, 2016 at 1:44 PM Cory Johns <cory.jo...@canonical.com> > wrote: > >> Just wanted to give a heads-up about a feature that landed in the >> reactive base layer yesterday. >> >> If a charm config option has changed, the state "config.changed" will be >> set for the duration of the hook. Additionally, specific states will be >> set for each config option that changed; that is, if option "foo" has >> changed, the state "config.changed.foo" will be set. An example of code >> using this would be: >> >> @when('myservice.started', 'config.changed') >> def update_config(): >> update_config_files() >> restart_myservice() >> >> This provides a much cleaner way of detecting changes to config, and it >> is recommended that this be used in favor of @hook('config-changed') going >> forward, as the latter can actually run in to some situations, albeit >> rather rarely, where the charm sees new config option values before the >> config-changed hook has fired. Using the reactive states avoids that >> completely as well as working more naturally with existing @when decorators. >> >> Please note that, while we are not aware of any charms currently using >> "config.changed" as a state, there is some risk of the state set by the >> base layer conflicting with it if set by the charm layer. The >> recommendation is to always prefix your states by the name of the layer >> setting them, or the relation name for interface layers. >> -- >> Juju mailing list >> Juju@lists.ubuntu.com >> Modify settings or unsubscribe at: >> https://lists.ubuntu.com/mailman/listinfo/juju >> > > -- > Juju mailing list > Juju@lists.ubuntu.com > Modify settings or unsubscribe at: > https://lists.ubuntu.com/mailman/listinfo/juju > >
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