code: def _jobStoreClasses(self):
          
          jobStoreClassNames = (
              "toil.jobStores.azureJobStore.AzureJobStore",
              "toil.jobStores.fileJobStore.FileJobStore",
              "toil.jobStores.googleJobStore.GoogleJobStore",
              "toil.jobStores.aws.jobStore.AWSJobStore",
              "toil.jobStores.abstractJobStore.JobStoreSupport")
          jobStoreClasses = []
          for className in jobStoreClassNames:
              moduleName, className = className.rsplit('.', 1)
              from importlib import import_module
              try:
                  module = import_module(moduleName)
              except ImportError:
                  logger.debug("Unable to import '%s' as is expected if the corresponding extra was "
                               "omitted at installation time.", moduleName)
              else:
                  jobStoreClass = getattr(module, className)
                  jobStoreClasses.append(jobStoreClass)
          return jobStoreClasses
docs: A list of concrete AbstractJobStore implementations whose dependencies are installed.
  
          :rtype: list[AbstractJobStore]