| /* |
| * 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. |
| */ |
| |
| package org.apache.griffin.measure.step.read |
| |
| import org.apache.spark.sql._ |
| import scala.util.Try |
| |
| import org.apache.griffin.measure.context.DQContext |
| import org.apache.griffin.measure.step.DQStep |
| |
| trait ReadStep extends DQStep { |
| |
| val config: Map[String, Any] |
| |
| val cache: Boolean |
| |
| def execute(context: DQContext): Try[Boolean] = Try { |
| info(s"read data source [$name]") |
| read(context) match { |
| case Some(df) => |
| // if (needCache) context.dataFrameCache.cacheDataFrame(name, df) |
| context.runTimeTableRegister.registerTable(name, df) |
| true |
| case _ => |
| warn(s"read data source [$name] fails") |
| false |
| } |
| } |
| |
| def read(context: DQContext): Option[DataFrame] |
| |
| } |