| /* |
| 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.datasource.connector.streaming |
| |
| import scala.util.Try |
| |
| import org.apache.spark.rdd.RDD |
| import org.apache.spark.sql._ |
| import org.apache.spark.streaming.dstream.InputDStream |
| |
| import org.apache.griffin.measure.context.TimeRange |
| import org.apache.griffin.measure.datasource.cache.StreamingCacheClient |
| import org.apache.griffin.measure.datasource.connector.DataConnector |
| |
| |
| trait StreamingDataConnector extends DataConnector { |
| |
| type K |
| type V |
| type OUT |
| |
| protected def stream(): Try[InputDStream[OUT]] |
| |
| // transform rdd to dataframe |
| def transform(rdd: RDD[OUT]): Option[DataFrame] |
| |
| // streaming data connector cannot directly read data frame |
| def data(ms: Long): (Option[DataFrame], TimeRange) = (None, TimeRange.emptyTimeRange) |
| |
| val streamingCacheClientOpt: Option[StreamingCacheClient] |
| |
| } |