Fixed #35859 -- Added background Tasks framework interface.

This work implements what was defined in DEP 14
(https://github.com/django/deps/blob/main/accepted/0014-background-workers.rst).

Thanks to Raphael Gaschignard, Eric Holscher, Ran Benita, Sarah Boyce,
Jacob Walls, and Natalia Bidart for the reviews.

1 files changed, 21 insertions, 0 deletions

diff --git a/django/tasks/exceptions.py b/django/tasks/exceptions.py
new file mode 100644
index 0000000000..91bd8f4cd5
--- /dev/null
+++ b/django/tasks/exceptions.py
@@ -0,0 +1,21 @@
+from django.core.exceptions import ImproperlyConfigured
+
+
+class TaskException(Exception):
+    """Base class for task-related exceptions. Do not raise directly."""
+
+
+class InvalidTask(TaskException):
+    """The provided Task is invalid."""
+
+
+class InvalidTaskBackend(ImproperlyConfigured):
+    """The provided Task backend is invalid."""
+
+
+class TaskResultDoesNotExist(TaskException):
+    """The requested TaskResult does not exist."""
+
+
+class TaskResultMismatch(TaskException):
+    """The requested TaskResult is invalid."""