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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):
"""Called when the resolver adds a new requirement into the resolve criteria.
"""
def backtracking(self, candidate):
"""Called when the resolver rejects a candidate during backtracking.
"""
def pinning(self, candidate):
"""Called when adding a candidate to the potential solution.
"""