| /** |
| * 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.apex.examples.transform; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.hadoop.conf.Configuration; |
| |
| import com.datatorrent.api.Context; |
| import com.datatorrent.api.DAG; |
| import com.datatorrent.api.StreamingApplication; |
| import com.datatorrent.api.annotation.ApplicationAnnotation; |
| import com.datatorrent.common.partitioner.StatelessPartitioner; |
| import com.datatorrent.lib.io.ConsoleOutputOperator; |
| import com.datatorrent.lib.transform.TransformOperator; |
| |
| @ApplicationAnnotation(name = "TransformExample") |
| /** |
| * @since 3.7.0 |
| */ |
| public class Application implements StreamingApplication |
| { |
| @Override |
| public void populateDAG(DAG dag, Configuration conf) |
| { |
| POJOGenerator input = dag.addOperator("Input", new POJOGenerator()); |
| TransformOperator transform = dag.addOperator("Process", new TransformOperator()); |
| // Set expression map |
| Map<String, String> expMap = new HashMap<>(); |
| expMap.put("name", "{$.firstName}.concat(\" \").concat({$.lastName})"); |
| expMap.put("age", "(new java.util.Date()).getYear() - {$.dateOfBirth}.getYear()"); |
| expMap.put("address", "{$.address}.toLowerCase()"); |
| transform.setExpressionMap(expMap); |
| ConsoleOutputOperator output = dag.addOperator("Output", new ConsoleOutputOperator()); |
| |
| dag.addStream("InputToTransform", input.output, transform.input); |
| dag.addStream("TransformToOutput", transform.output, output.input); |
| |
| dag.setInputPortAttribute(transform.input, Context.PortContext.TUPLE_CLASS, CustomerEvent.class); |
| dag.setOutputPortAttribute(transform.output, Context.PortContext.TUPLE_CLASS, CustomerInfo.class); |
| dag.setAttribute(transform, Context.OperatorContext.PARTITIONER, new StatelessPartitioner<TransformOperator>(2)); |
| } |
| } |