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| <h1>Source code for airflow.contrib.sensors.cassandra_table_sensor</h1><div class="highlight"><pre> |
| <span></span><span class="c1"># -*- coding: utf-8 -*-</span> |
| <span class="c1">#</span> |
| <span class="c1"># Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="c1"># or more contributor license agreements. See the NOTICE file</span> |
| <span class="c1"># distributed with this work for additional information</span> |
| <span class="c1"># regarding copyright ownership. The ASF licenses this file</span> |
| <span class="c1"># to you under the Apache License, Version 2.0 (the</span> |
| <span class="c1"># "License"); you may not use this file except in compliance</span> |
| <span class="c1"># with the License. You may obtain a copy of the License at</span> |
| <span class="c1">#</span> |
| <span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="c1">#</span> |
| <span class="c1"># Unless required by applicable law or agreed to in writing,</span> |
| <span class="c1"># software distributed under the License is distributed on an</span> |
| <span class="c1"># "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span> |
| <span class="c1"># KIND, either express or implied. See the License for the</span> |
| <span class="c1"># specific language governing permissions and limitations</span> |
| <span class="c1"># under the License.</span> |
| <span class="kn">from</span> <span class="nn">airflow.contrib.hooks.cassandra_hook</span> <span class="kn">import</span> <span class="n">CassandraHook</span> |
| <span class="kn">from</span> <span class="nn">airflow.sensors.base_sensor_operator</span> <span class="kn">import</span> <span class="n">BaseSensorOperator</span> |
| <span class="kn">from</span> <span class="nn">airflow.utils.decorators</span> <span class="kn">import</span> <span class="n">apply_defaults</span> |
| |
| |
| <div class="viewcode-block" id="CassandraTableSensor"><a class="viewcode-back" href="../../../../_api/airflow/contrib/sensors/cassandra_table_sensor/index.html#airflow.contrib.sensors.cassandra_table_sensor.CassandraTableSensor">[docs]</a><span class="k">class</span> <span class="nc">CassandraTableSensor</span><span class="p">(</span><span class="n">BaseSensorOperator</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Checks for the existence of a table in a Cassandra cluster.</span> |
| |
| <span class="sd"> For example, if you want to wait for a table called 't' to be created</span> |
| <span class="sd"> in a keyspace 'k', instantiate it as follows:</span> |
| |
| <span class="sd"> >>> cassandra_sensor = CassandraTableSensor(table="k.t",</span> |
| <span class="sd"> ... cassandra_conn_id="cassandra_default",</span> |
| <span class="sd"> ... task_id="cassandra_sensor")</span> |
| <span class="sd"> """</span> |
| <div class="viewcode-block" id="CassandraTableSensor.template_fields"><a class="viewcode-back" href="../../../../_api/airflow/contrib/sensors/cassandra_table_sensor/index.html#airflow.contrib.sensors.cassandra_table_sensor.CassandraTableSensor.template_fields">[docs]</a> <span class="n">template_fields</span> <span class="o">=</span> <span class="p">(</span><span class="s1">'table'</span><span class="p">,)</span></div> |
| |
| <span class="nd">@apply_defaults</span> |
| <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">table</span><span class="p">,</span> <span class="n">cassandra_conn_id</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Create a new CassandraTableSensor</span> |
| |
| <span class="sd"> :param table: Target Cassandra table.</span> |
| <span class="sd"> Use dot notation to target a specific keyspace.</span> |
| <span class="sd"> :type table: str</span> |
| <span class="sd"> :param cassandra_conn_id: The connection ID to use</span> |
| <span class="sd"> when connecting to Cassandra cluster</span> |
| <span class="sd"> :type cassandra_conn_id: str</span> |
| <span class="sd"> """</span> |
| <span class="nb">super</span><span class="p">(</span><span class="n">CassandraTableSensor</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">cassandra_conn_id</span> <span class="o">=</span> <span class="n">cassandra_conn_id</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">table</span> <span class="o">=</span> <span class="n">table</span> |
| |
| <div class="viewcode-block" id="CassandraTableSensor.poke"><a class="viewcode-back" href="../../../../_api/airflow/contrib/sensors/cassandra_table_sensor/index.html#airflow.contrib.sensors.cassandra_table_sensor.CassandraTableSensor.poke">[docs]</a> <span class="k">def</span> <span class="nf">poke</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s1">'Sensor check existence of table: </span><span class="si">%s</span><span class="s1">'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">table</span><span class="p">)</span> |
| <span class="n">hook</span> <span class="o">=</span> <span class="n">CassandraHook</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">cassandra_conn_id</span><span class="p">)</span> |
| <span class="k">return</span> <span class="n">hook</span><span class="o">.</span><span class="n">table_exists</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">table</span><span class="p">)</span></div></div> |
| </pre></div> |
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