diff --git a/lib/galaxy/managers/display_applications.py b/lib/galaxy/managers/display_applications.py
new file mode 100644
index 00000000000..2da27193768
--- /dev/null
+++ b/lib/galaxy/managers/display_applications.py
@@ -0,0 +1,61 @@
+import logging
+from typing import (
+    Any, Dict,
+    List,
+)
+
+from galaxy.datatypes.registry import Registry
+
+log = logging.getLogger(__name__)
+
+
+class DisplayApplicationsManager:
+    """Interface/service object for sharing logic between controllers."""
+
+    def __init__(self, app):
+        self._app = app
+
+    @property
+    def datatypes_registry(self) -> Registry:
+        return self._app.datatypes_registry
+
+    def index(self) -> List[Any]:
+        """
+        Returns the list of display applications.
+
+        :returns:   list of available display applications
+        :rtype:     list
+        """
+        rval = []
+        for display_app in self.datatypes_registry.display_applications.values():
+            rval.append({
+                'id': display_app.id,
+                'name': display_app.name,
+                'version': display_app.version,
+                'filename_': display_app._filename,
+                'links': [{'name': link.name} for link in display_app.links.values()]
+            })
+        return rval
+
+    def reload(self, ids: List[str]) -> Dict[str, Any]:
+        """
+        Reloads the list of display applications.
+
+        :param  ids:  list containing ids of display to be reloaded
+        :type   ids:  list
+        """
+        self._app.queue_worker.send_control_task(
+            'reload_display_application',
+            noop_self=True,
+            kwargs={'display_application_ids': ids}
+        )
+        reloaded, failed = self.datatypes_registry.reload_display_applications(ids)
+        if not reloaded and failed:
+            message = 'Unable to reload any of the %i requested display applications ("%s").' % (len(failed), '", "'.join(failed))
+        elif failed:
+            message = 'Reloaded %i display applications ("%s"), but failed to reload %i display applications ("%s").' % (len(reloaded), '", "'.join(reloaded), len(failed), '", "'.join(failed))
+        elif not reloaded:
+            message = 'You need to request at least one display application to reload.'
+        else:
+            message = 'Reloaded %i requested display applications ("%s").' % (len(reloaded), '", "'.join(reloaded))
+        return {'message': message, 'reloaded': reloaded, 'failed': failed}
diff --git a/lib/galaxy/webapps/galaxy/api/display_applications.py b/lib/galaxy/webapps/galaxy/api/display_applications.py
index cdba5b8047d..56adeaf3ae3 100644
--- a/lib/galaxy/webapps/galaxy/api/display_applications.py
+++ b/lib/galaxy/webapps/galaxy/api/display_applications.py
@@ -3,6 +3,8 @@ API operations on annotations.
 """
 import logging
 
+from galaxy.app import StructuredApp
+from galaxy.managers.display_applications import DisplayApplicationsManager
 from galaxy.web import (
     expose_api,
     require_admin,
@@ -14,6 +16,10 @@ log = logging.getLogger(__name__)
 
 class DisplayApplicationsController(BaseAPIController):
 
+    def __init__(self, app: StructuredApp):
+        super().__init__(app)
+        self.manager = DisplayApplicationsManager(app)
+
     @expose_api
     def index(self, trans, **kwd):
         """
@@ -24,16 +30,7 @@ class DisplayApplicationsController(BaseAPIController):
         :returns:   list of available display applications
         :rtype:     list
         """
-        response = []
-        for display_app in trans.app.datatypes_registry.display_applications.values():
-            response.append({
-                'id': display_app.id,
-                'name': display_app.name,
-                'version': display_app.version,
-                'filename_': display_app._filename,
-                'links': [{'name': link.name} for link in display_app.links.values()]
-            })
-        return response
+        return self.manager.index()
 
     @expose_api
     @require_admin
@@ -47,19 +44,5 @@ class DisplayApplicationsController(BaseAPIController):
         :type   ids:  list
         """
         payload = payload or {}
-        ids = payload.get('ids')
-        trans.app.queue_worker.send_control_task(
-            'reload_display_application',
-            noop_self=True,
-            kwargs={'display_application_ids': ids}
-        )
-        reloaded, failed = trans.app.datatypes_registry.reload_display_applications(ids)
-        if not reloaded and failed:
-            message = 'Unable to reload any of the %i requested display applications ("%s").' % (len(failed), '", "'.join(failed))
-        elif failed:
-            message = 'Reloaded %i display applications ("%s"), but failed to reload %i display applications ("%s").' % (len(reloaded), '", "'.join(reloaded), len(failed), '", "'.join(failed))
-        elif not reloaded:
-            message = 'You need to request at least one display application to reload.'
-        else:
-            message = 'Reloaded %i requested display applications ("%s").' % (len(reloaded), '", "'.join(reloaded))
-        return {'message': message, 'reloaded': reloaded, 'failed': failed}
+        ids = payload.get('ids', [])
+        return self.manager.reload(ids)