[GitHub] XD-DENG commented on a change in pull request #4496: [AIRFLOW-722] Add celery queue sensor

[GitBox <gi...@apache.org>]

XD-DENG commented on a change in pull request #4496: [AIRFLOW-722] Add celery queue sensor
URL: https://github.com/apache/airflow/pull/4496#discussion_r247311616
 
 

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 File path: airflow/contrib/sensors/celery_queue_sensor.py
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 @@ -0,0 +1,92 @@
+# -*- coding: utf-8 -*-
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+from __future__ import absolute_import
+
+from airflow.sensors.base_sensor_operator import BaseSensorOperator
+from airflow.utils.decorators import apply_defaults
+
+from celery.app import control
+
+
+class CeleryQueueSensor(BaseSensorOperator):
+    """
+    Waits for a Celery queue to be empty. By default, in order to be considered
+    empty, the queue must not have any tasks in the ``reserved``, ``scheduled``
+    or ``active`` states.
+
+    :param celery_queue: The name of the Celery queue to wait for.
+    :type celery_queue: str
+    :param af_task_id: Task id for checking
+    :type af_task_id: str
+    """
+    @apply_defaults
+    def __init__(
+            self,
+            celery_queue,
+            af_task_id=None,
 
 Review comment:
   The meaning of `af` here is? If it's "airflow", possibly "task_id" would suffice?

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