content: /**
   * 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.malhar.python;
  
  import org.apache.apex.malhar.lib.function.Function;
  import org.apache.apex.malhar.lib.function.FunctionOperator;
  import org.apache.apex.malhar.lib.function.FunctionOperatorUtil;
  import org.apache.hadoop.conf.Configuration;
  
  import com.google.common.annotations.VisibleForTesting;
  
  import com.datatorrent.api.DAG;
  import com.datatorrent.api.StreamingApplication;
  import com.datatorrent.api.annotation.ApplicationAnnotation;
  
  @ApplicationAnnotation(name = "PythonOperatorExample")
  /**
   * @since 3.8.0
   */
  public class PythonExecutorApplication implements StreamingApplication
  {
    @VisibleForTesting
    Function.MapFunction<Object, ?> outputFn = FunctionOperatorUtil.CONSOLE_SINK_FN;
  
    @VisibleForTesting
    PythonPayloadPOJOGenerator pojoDataGenerator;
  
    @VisibleForTesting
    SimplePythonOpOperator simplePythonOpOperator;
  
    @Override
    public void populateDAG(DAG dag, Configuration conf)
    {
      pojoDataGenerator = dag.addOperator("Input", new PythonPayloadPOJOGenerator());
      simplePythonOpOperator = dag.addOperator("pythonprocessor", new SimplePythonOpOperator());
      FunctionOperator.MapFunctionOperator<Object, ?> output = dag.addOperator("out",
          new FunctionOperator.MapFunctionOperator<>(outputFn));
      dag.addStream("InputToPython", pojoDataGenerator.output, simplePythonOpOperator.input);
      dag.addStream("PythonToOutput", simplePythonOpOperator.outputPort, output.input);
  
    }
  
  }
  