key on musicbrainz disc id by default

Do not use cache if the mb disc id does not match the table cache value.

Fixes asserts on the mb disc id differing.

Fixes trac ticket 103.

morituri/common/program.py

@@ -67,11 +67,6 @@ class Program(log.Loggable):
         self._cache = cache.ResultCache()
         self._stdout = stdout
 
-    def _getTableCachePath(self):
-        path = os.path.join(os.path.expanduser('~'), '.morituri', 'cache',
-            'table')
-        return path
-
     def setWorkingDirectory(self, workingDirectory):
         if workingDirectory:
             self.info('Changing to working directory %s' % workingDirectory)
@@ -139,7 +134,7 @@ class Program(log.Loggable):
         assert toc.hasTOC()
         return toc
 
-    def getTable(self, runner, cddbdiscid, device):
+    def getTable(self, runner, cddbdiscid, mbdiscid, device):
         """
         Retrieve the Table either from the cache or the drive.
 
@@ -147,12 +142,13 @@ class Program(log.Loggable):
         """
         path = self._getTableCachePath()
 
-        pcache = cache.PersistedCache(path)
-        ptable = pcache.get(cddbdiscid)
+        tcache = cache.TableCache()
+        ptable = tcache.get(cddbdiscid, mbdiscid)
 
         if not ptable.object:
-            self.debug('getTable: cddbdiscid %s not in cache, reading table' %
-                cddbdiscid)
+            self.debug('getTable: cddbdiscid %s, mbdiscid %s not in cache, '
+                'reading table' % (
+                cddbdiscid, mbdiscid))
             t = cdrdao.ReadTableTask(device=device)
             runner.run(t)
             ptable.persist(t.table)