code: def _setupCache(self):
          
          # we first check whether the cache directory exists. If it doesn't, create it.
          if not os.path.exists(self.localCacheDir):
              # Create a temporary directory as this worker's private cache. If all goes well, it
              # will be renamed into the cache for this node.
              personalCacheDir = ''.join([os.path.dirname(self.localCacheDir), '/.ctmp-',
                                          str(uuid.uuid4())])
              os.mkdir(personalCacheDir, 0o755)
              self._createCacheLockFile(personalCacheDir)
              try:
                  os.rename(personalCacheDir, self.localCacheDir)
              except OSError as err:
                  # The only acceptable FAIL case is that the destination is a non-empty directory
                  # directory.  Assuming (it's ambiguous) atomic renaming of directories, if the
                  # dst is non-empty, it only means that another worker has beaten this one to the
                  # rename.
                  if err.errno == errno.ENOTEMPTY:
                      # Cleanup your own mess.  It's only polite.
                      shutil.rmtree(personalCacheDir)
                  else:
                      raise
          # You can't reach here unless a local cache directory has been created successfully
          with self._CacheState.open(self) as cacheInfo:
              # Ensure this cache is from the correct attempt at the workflow!  If it isn't, we
              # need to reset the cache lock file
              if cacheInfo.attemptNumber != self.workflowAttemptNumber:
                  if cacheInfo.nlink == 2:
                      cacheInfo.cached = 0  # cached file sizes are accounted for by job store
                  else:
                      allCachedFiles = [os.path.join(self.localCacheDir, x)
                                        for x in os.listdir(self.localCacheDir)
                                        if not self._isHidden(x)]
                      cacheInfo.cached = sum([os.stat(cachedFile).st_size
                                              for cachedFile in allCachedFiles])
                      # TODO: Delete the working directories
                  cacheInfo.sigmaJob = 0
                  cacheInfo.attemptNumber = self.workflowAttemptNumber
              self.nlinkThreshold = cacheInfo.nlink
docs: Setup the cache based on the provided values for localCacheDir.