/*
 * 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 it.pkg;

import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.beam.sdk.transforms.Create;
import org.apache.beam.sdk.transforms.DoFn;
import org.apache.beam.sdk.transforms.MapElements;
import org.apache.beam.sdk.transforms.ParDo;
import org.apache.beam.sdk.transforms.SimpleFunction;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A starter example for writing Beam programs.
 *
 * <p>The example takes two strings, converts them to their upper-case
 * representation and logs them.
 *
 * <p>To run this starter example locally using DirectRunner, just
 * execute it without any additional parameters from your favorite development
 * environment.
 *
 * <p>To run this starter example using managed resource in Google Cloud
 * Platform, you should specify the following command-line options:
 *   --project=<YOUR_PROJECT_ID>
 *   --stagingLocation=<STAGING_LOCATION_IN_CLOUD_STORAGE>
 *   --runner=DataflowRunner
 */
public class StarterPipeline {
  private static final Logger LOG = LoggerFactory.getLogger(StarterPipeline.class);

  public static void main(String[] args) {
    Pipeline p = Pipeline.create(
        PipelineOptionsFactory.fromArgs(args).withValidation().create());

    p.apply(Create.of("Hello", "World"))
    .apply(MapElements.via(new SimpleFunction<String, String>() {
      @Override
      public String apply(String input) {
        return input.toUpperCase();
      }
    }))
    .apply(ParDo.of(new DoFn<String, Void>() {
      @ProcessElement
      public void processElement(ProcessContext c)  {
        LOG.info(c.element());
      }
    }));

    p.run();
  }
}
