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bzrlib/fetch.py
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    This is for use by fetchers and converters.
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    """
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    # This is a class variable so that the test suite can override it.
 
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    known_graph_threshold = 100
 
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    def __init__(self, source):
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        """Constructor.
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        # yet, and are unlikely to in non-rich-root environments anyway.
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        root_id_order.sort(key=operator.itemgetter(0))
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        # Create a record stream containing the roots to create.
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        if len(revs) > 100:
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            # XXX: not covered by tests, should have a flag to always run
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            # this. -- mbp 20100129
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            graph = self.source_repo.get_known_graph_ancestry(revs)
 
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        if len(revs) > self.known_graph_threshold:
 
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            graph = self.source.get_known_graph_ancestry(revs)
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        new_roots_stream = _new_root_data_stream(
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            root_id_order, rev_id_to_root_id, parent_map, self.source, graph)
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        return [('texts', new_roots_stream)]