root / snf-pithos-backend / pithos / backends / lib / hashfiler / mapper.py @ 3d875ca3
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1 | 2e662088 | Antony Chazapis | # Copyright 2011-2012 GRNET S.A. All rights reserved.
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2 | 2715ade4 | Sofia Papagiannaki | #
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3 | a9b3f29d | Antony Chazapis | # Redistribution and use in source and binary forms, with or
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4 | a9b3f29d | Antony Chazapis | # without modification, are permitted provided that the following
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5 | a9b3f29d | Antony Chazapis | # conditions are met:
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6 | 2715ade4 | Sofia Papagiannaki | #
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7 | a9b3f29d | Antony Chazapis | # 1. Redistributions of source code must retain the above
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8 | a9b3f29d | Antony Chazapis | # copyright notice, this list of conditions and the following
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9 | a9b3f29d | Antony Chazapis | # disclaimer.
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10 | 2715ade4 | Sofia Papagiannaki | #
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11 | a9b3f29d | Antony Chazapis | # 2. Redistributions in binary form must reproduce the above
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12 | a9b3f29d | Antony Chazapis | # copyright notice, this list of conditions and the following
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13 | a9b3f29d | Antony Chazapis | # disclaimer in the documentation and/or other materials
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14 | a9b3f29d | Antony Chazapis | # provided with the distribution.
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15 | 2715ade4 | Sofia Papagiannaki | #
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16 | a9b3f29d | Antony Chazapis | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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17 | a9b3f29d | Antony Chazapis | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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18 | a9b3f29d | Antony Chazapis | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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19 | a9b3f29d | Antony Chazapis | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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20 | a9b3f29d | Antony Chazapis | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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21 | a9b3f29d | Antony Chazapis | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 | a9b3f29d | Antony Chazapis | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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23 | a9b3f29d | Antony Chazapis | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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24 | a9b3f29d | Antony Chazapis | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | a9b3f29d | Antony Chazapis | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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26 | a9b3f29d | Antony Chazapis | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 | a9b3f29d | Antony Chazapis | # POSSIBILITY OF SUCH DAMAGE.
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28 | 2715ade4 | Sofia Papagiannaki | #
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29 | a9b3f29d | Antony Chazapis | # The views and conclusions contained in the software and
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30 | a9b3f29d | Antony Chazapis | # documentation are those of the authors and should not be
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31 | a9b3f29d | Antony Chazapis | # interpreted as representing official policies, either expressed
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32 | a9b3f29d | Antony Chazapis | # or implied, of GRNET S.A.
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33 | a9b3f29d | Antony Chazapis | |
34 | c30635bf | Filippos Giannakos | from filemapper import FileMapper |
35 | a9b3f29d | Antony Chazapis | |
36 | 29148653 | Sofia Papagiannaki | |
37 | a9b3f29d | Antony Chazapis | class Mapper(object): |
38 | a9b3f29d | Antony Chazapis | """Mapper.
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39 | 47462eda | Filippos Giannakos | Required constructor parameters: mappath, namelen.
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40 | 47462eda | Filippos Giannakos | Optional mappool.
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41 | a9b3f29d | Antony Chazapis | """
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42 | a9b3f29d | Antony Chazapis | |
43 | a9b3f29d | Antony Chazapis | def __init__(self, **params): |
44 | 47462eda | Filippos Giannakos | self.rmap = None |
45 | 47462eda | Filippos Giannakos | try:
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46 | 47462eda | Filippos Giannakos | if params['mappool']: |
47 | 43411855 | Sofia Papagiannaki | from radosmapper import RadosMapper |
48 | 47462eda | Filippos Giannakos | self.rmap = RadosMapper(**params)
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49 | 29148653 | Sofia Papagiannaki | except KeyError: |
50 | 47462eda | Filippos Giannakos | pass
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51 | a9b3f29d | Antony Chazapis | |
52 | 47462eda | Filippos Giannakos | self.fmap = FileMapper(**params)
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53 | a9b3f29d | Antony Chazapis | |
54 | 1c2fc0ff | Antony Chazapis | def map_retr(self, maphash, blkoff=0, nr=100000000000000): |
55 | a9b3f29d | Antony Chazapis | """Return as a list, part of the hashes map of an object
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56 | a9b3f29d | Antony Chazapis | at the given block offset.
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57 | a9b3f29d | Antony Chazapis | By default, return the whole hashes map.
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58 | a9b3f29d | Antony Chazapis | """
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59 | c30635bf | Filippos Giannakos | return self.fmap.map_retr(maphash, blkoff, nr) |
60 | a9b3f29d | Antony Chazapis | |
61 | 3d875ca3 | Chrysostomos Nanakos | def map_stor(self, maphash, hashes=(), blkoff=0): |
62 | 1c2fc0ff | Antony Chazapis | """Store hashes in the given hashes map."""
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63 | 47462eda | Filippos Giannakos | if self.rmap: |
64 | 3d875ca3 | Chrysostomos Nanakos | self.rmap.map_stor(maphash, hashes, blkoff)
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65 | 3d875ca3 | Chrysostomos Nanakos | self.fmap.map_stor(maphash, hashes, blkoff) |