class BaseReporter(object): """Delegate class to provider progress reporting for the resolver.""" def starting(self): """Called before the resolution actually starts.""" def starting_round(self, index): """Called before each round of resolution starts. The index is zero-based. """ def ending_round(self, index, state): """Called before each round of resolution ends. This is NOT called if the resolution ends at this round. Use `ending` if you want to report finalization. The index is zero-based. """ def ending(self, state): """Called before the resolution ends successfully.""" def adding_requirement(self, requirement, parent): """Called when adding a new requirement into the resolve criteria. :param requirement: The additional requirement to be applied to filter the available candidaites. :param parent: The candidate that requires ``requirement`` as a dependency, or None if ``requirement`` is one of the root requirements passed in from ``Resolver.resolve()``. """ def resolving_conflicts(self, causes): """Called when starting to attempt requirement conflict resolution. :param causes: The information on the collision that caused the backtracking. """ def rejecting_candidate(self, criterion, candidate): """Called when rejecting a candidate during backtracking.""" def pinning(self, candidate): """Called when adding a candidate to the potential solution."""