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      1 #!/usr/bin/env python
      2 # Copyright (c) 2009, Google Inc. All rights reserved.
      3 #
      4 # Redistribution and use in source and binary forms, with or without
      5 # modification, are permitted provided that the following conditions are
      6 # met:
      7 # 
      8 #     * Redistributions of source code must retain the above copyright
      9 # notice, this list of conditions and the following disclaimer.
     10 #     * Redistributions in binary form must reproduce the above
     11 # copyright notice, this list of conditions and the following disclaimer
     12 # in the documentation and/or other materials provided with the
     13 # distribution.
     14 #     * Neither the name of Google Inc. nor the names of its
     15 # contributors may be used to endorse or promote products derived from
     16 # this software without specific prior written permission.
     17 # 
     18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29 
     30 class PersistentPatchCollectionDelegate:
     31     def collection_name(self):
     32         raise NotImplementedError, "subclasses must implement"
     33 
     34     def fetch_potential_patch_ids(self):
     35         raise NotImplementedError, "subclasses must implement"
     36 
     37     def status_server(self):
     38         raise NotImplementedError, "subclasses must implement"
     39 
     40     def is_terminal_status(self, status):
     41         raise NotImplementedError, "subclasses must implement"
     42 
     43 
     44 class PersistentPatchCollection:
     45     def __init__(self, delegate):
     46         self._delegate = delegate
     47         self._name = self._delegate.collection_name()
     48         self._status = self._delegate.status_server()
     49         self._status_cache = {}
     50 
     51     def _cached_status(self, patch_id):
     52         cached = self._status_cache.get(patch_id)
     53         if cached:
     54             return cached
     55         status = self._status.patch_status(self._name, patch_id)
     56         if status and self._delegate.is_terminal_status(status):
     57             self._status_cache[patch_id] = status
     58         return status
     59 
     60     def next(self):
     61         patch_ids = self._delegate.fetch_potential_patch_ids()
     62         for patch_id in patch_ids:
     63             status = self._cached_status(patch_id)
     64             if not status or not self._delegate.is_terminal_status(status):
     65                 return patch_id
     66