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1 #!/usr/bin/python2.5 |
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2 # |
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3 # Copyright 2009 the Melange authors. |
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4 # |
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5 # Licensed under the Apache License, Version 2.0 (the "License"); |
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6 # you may not use this file except in compliance with the License. |
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7 # You may obtain a copy of the License at |
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8 # |
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9 # http://www.apache.org/licenses/LICENSE-2.0 |
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10 # |
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11 # Unless required by applicable law or agreed to in writing, software |
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12 # distributed under the License is distributed on an "AS IS" BASIS, |
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13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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14 # See the License for the specific language governing permissions and |
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15 # limitations under the License. |
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16 |
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17 """Module contains logic memcaching functions. |
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18 """ |
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19 |
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20 __authors__ = [ |
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21 '"Sverre Rabbelier" <sverre@rabbelier.nl>', |
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22 ] |
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23 |
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24 |
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25 from google.appengine.api import memcache |
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26 |
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27 import soc.cache.base |
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28 |
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29 |
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30 def key(model, filter): |
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31 """Returns the memcache key for this query. |
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32 """ |
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33 |
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34 return 'query_for_%s_%s' % (repr(model.kind()), repr(filter)) |
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35 |
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36 |
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37 def get(model, filter, *args, **kwargs): |
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38 """Retrieves the data for the specified query from the memcache. |
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39 """ |
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40 |
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41 memcache_key = key(model, filter) |
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42 import logging; logging.info(memcache_key) |
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43 return memcache.get(memcache_key), memcache_key |
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44 |
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45 |
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46 def put(data, memcache_key, *args, **kwargs): |
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47 """Sets the data for the specified query in the memcache. |
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48 |
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49 Args: |
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50 data: the data to be cached |
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51 """ |
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52 |
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53 # Store data for fifteen minutes to force a refresh every so often |
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54 retention = 15*60 |
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55 |
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56 memcache.add(memcache_key, data, retention) |
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57 |
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58 |
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59 def flush(model, filter): |
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60 """Removes the data for the current user from the memcache. |
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61 """ |
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62 |
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63 memcache_key = key(model, filter) |
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64 memcache.delete(memcache_key) |
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65 |
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66 |
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67 # define the cache function |
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68 cache = soc.cache.base.getCacher(get, put) |