Two Phase Updates# A system for two phase updates: Update, and Commit. class ppb.features.twophase.Commit[source]# Fired after Update. class ppb.features.twophase.TwoPhaseMixin[source]# Mixin to apply to objects to handle two phase updates. on_commit(event, signal)[source]# Commit changes previously staged. stage_changes(**kwargs)[source]# Stage changes for the next commit. These are just properties on the current object to update. class ppb.features.twophase.TwoPhaseSystem(**props)[source]# Produces the Commit event.