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Viewing changes to loggerhead/changecache.py

[rs=mwhudson][release-critical=Rinchen] update to loggerhead trunk,
        mainly to get the code to not hold branches open the whole time but
        also getting some other improvements

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loggerhead/changecache.py
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from loggerhead import util
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from loggerhead.lockfile import LockFile
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with_lock = util.with_lock('_lock', 'ChangeCache')
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SQLITE_INTERFACE = os.environ.get('SQLITE_INTERFACE', 'sqlite')
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elif SQLITE_INTERFACE == 'sqlite':
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    import sqlite as dbapi2
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    _param_marker = '%s'
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else:
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    raise AssertionError("bad sqlite interface %r!?"%SQLITE_INTERFACE)
 
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_select_stmt = ("select data from revisiondata where revid = ?"
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                ).replace('?', _param_marker)