QgsProject Notify/Listen

[qgib]

Author Name: Raul Sangonzalo (Raul Sangonzalo)
Original Redmine Issue: 21391

Redmine category:data_provider/postgis

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At the moment, the only way to "LISTEN" to postgres database is through QgsProvider or QgsMapLayer. This inevitably needs to target a layer. It would be nice if the project itself (QgsProject) could be set up to listen to postgres and its respective signals.

The reason behind is that I have several plugins with different tables (task allocation, chat, notifications) with loaded layers (with set notify, refresh and repaintRequested) and signals, that leaves me with 3 permanent established connections to postgres.

• Using Python to "LISTEN" crashes as stated here: https://gis.stackexchange.com/questions/305219/qgis-3-python-plugin-psycopg2-postgres-notify-listen-live-connection

The only solution I can think of at the moment is to create a single table that stores my notify signals in postgres and use it to spread the signals in Qgis. However, this is a dodgy solution, so having the project to listen would open up a new world of possibilities, in my opinion.

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Also, the class QgsMapLayer contains 3 typos("Nofify"? -> setRefreshOnNofifyMessage, mIsRefreshOnNofifyEnabled, mRefreshOnNofifyMessage

Many thanks.