| /* |
| * 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.gearpump.streaming.source |
| |
| |
| import akka.actor.ActorSystem |
| import org.apache.gearpump.cluster.UserConfig |
| import org.apache.gearpump.streaming.dsl.plan.functions.DummyRunner |
| import org.apache.gearpump.streaming.dsl.window.impl.{FlatMapOperator, StreamingOperator} |
| import org.apache.gearpump.streaming.{Constants, Processor} |
| |
| /** |
| * Utility that helps user to create a DAG starting with [[DataSourceTask]] |
| * user should pass in a [[DataSource]] |
| * |
| * Here is an example to build a DAG that reads from Kafka source followed by word count |
| * {{{ |
| * val source = new KafkaSource() |
| * val sourceProcessor = DataSourceProcessor(source, 1) |
| * val split = Processor[Split](1) |
| * val sum = Processor[Sum](1) |
| * val dag = sourceProcessor ~> split ~> sum |
| * }}} |
| */ |
| object DataSourceProcessor { |
| def apply( |
| dataSource: DataSource, |
| parallelism: Int = 1, |
| description: String = "", |
| taskConf: UserConfig = UserConfig.empty)(implicit system: ActorSystem) |
| : Processor[DataSourceTask[Any, Any]] = { |
| Processor[DataSourceTask[Any, Any]](parallelism, description, |
| taskConf |
| .withValue[DataSource](Constants.GEARPUMP_STREAMING_SOURCE, dataSource) |
| .withValue[StreamingOperator[Any, Any]](Constants.GEARPUMP_STREAMING_OPERATOR, |
| new FlatMapOperator(new DummyRunner[Any]) |
| ) |
| ) |
| } |
| } |