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Viewing changes to bzrlib/_static_tuple_py.py

  • Committer: John Arbash Meinel
  • Date: 2010-08-04 04:33:24 UTC
  • mto: This revision was merged to the branch mainline in revision 5390.
  • Revision ID: john@arbash-meinel.com-20100804043324-1ldc2v2w1kza7ox4
get into the nitty gritty for the _key_to_sha1 function.

It doesn't seem to help to op-out of the actual unhexlify call, so at least
that doesn't seem to be the performance overhead.
We get down to around 19.9us for _key_to_sha1 across 120 keys, which is
0.166us per key.

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bzrlib/_static_tuple_py.py
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# Copyright (C) 2009 Canonical Ltd
 
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# Copyright (C) 2009, 2010 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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    def __init__(self, *args):
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        """Create a new 'StaticTuple'"""
 
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        num_keys = len(args)
 
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        if num_keys < 0 or num_keys > 255:
 
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            raise TypeError('StaticTuple(...) takes from 0 to 255 items')
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        for bit in args:
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            if type(bit) not in (str, StaticTuple, unicode, int, long, float,
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                                 None.__class__, bool):
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                raise TypeError('StaticTuple can only point to'
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                    ' StaticTuple, str, unicode, int, long, float, bool, or'
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                    ' None not %s' % (type(bit),))
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        num_keys = len(args)
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        if num_keys < 0 or num_keys > 255:
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            raise ValueError('must have 1 => 256 key bits')
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        # We don't need to pass args to tuple.__init__, because that was
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        # already handled in __new__.
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        tuple.__init__(self)