data is not being cached in celery task

lms/djangoapps/api_manager/courses/tasks.py

-"""
-This file contains celery tasks for api_manager courses
-"""
-
-import sys
-
-from celery.task import task  # pylint: disable=import-error,no-name-in-module
-from django.conf import settings
-from django.core.cache import cache
-
-
-@task(name=u'lms.djangoapps.api_manager.courses.tasks.cache_static_tab_content')
-def cache_static_tab_contents(cache_key, contents):
-    """
-    Caches course static tab contents.
-    """
-    cache_expiration = getattr(settings, 'STATIC_TAB_CONTENTS_CACHE_TTL', 60 * 5)
-    contents_max_size_limit = getattr(settings, 'STATIC_TAB_CONTENTS_CACHE_MAX_SIZE_LIMIT', 4000)
-
-    if not sys.getsizeof(contents) > contents_max_size_limit:
-        cache.set(cache_key, contents, cache_expiration)

lms/djangoapps/api_manager/courses/views.py

 """ API implementation for course-oriented interactions. """
 
+import sys
 from collections import OrderedDict
 import logging
 import itertools
@@ -53,7 +54,6 @@ from api_manager.users.serializers import UserSerializer, UserCountByCitySeriali
 from api_manager.utils import generate_base_uri, str2bool, get_time_series_data, parse_datetime
 from .serializers import CourseSerializer
 from .serializers import GradeSerializer, CourseLeadersSerializer, CourseCompletionsLeadersSerializer
-from .tasks import cache_static_tab_contents
 from progress.serializers import CourseModuleCompletionSerializer
 
 
@@ -383,11 +383,22 @@ def _get_static_tab_contents(request, course, tab):
     contents = cache.get(cache_key)
     if contents is None:
         contents = get_static_tab_contents(request, course, tab, wrap_xmodule_display=False)
-        cache_static_tab_contents.delay(cache_key, contents)
+        _cache_static_tab_contents(cache_key, contents)
 
     return contents
 
 
+def _cache_static_tab_contents(cache_key, contents):
+    """
+    Caches course static tab contents.
+    """
+    cache_expiration = getattr(settings, 'STATIC_TAB_CONTENTS_CACHE_TTL', 60 * 5)
+    contents_max_size_limit = getattr(settings, 'STATIC_TAB_CONTENTS_CACHE_MAX_SIZE_LIMIT', 4000)
+
+    if not sys.getsizeof(contents) > contents_max_size_limit:
+        cache.set(cache_key, contents, cache_expiration)
+
+
 class CourseContentList(SecureAPIView):
     """
     **Use Case**