/*
 * 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();
  }
}
