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.stream.sample;
  
  import java.util.Arrays;
  
  import org.joda.time.Duration;
  
  import org.apache.apex.malhar.lib.function.Function;
  import org.apache.apex.malhar.lib.util.KeyValPair;
  import org.apache.apex.malhar.lib.window.TriggerOption;
  import org.apache.apex.malhar.lib.window.Tuple;
  import org.apache.apex.malhar.lib.window.WindowOption;
  import org.apache.apex.malhar.stream.api.ApexStream;
  import org.apache.apex.malhar.stream.api.impl.StreamFactory;
  import org.apache.hadoop.conf.Configuration;
  
  import com.datatorrent.api.DAG;
  import com.datatorrent.api.StreamingApplication;
  import com.datatorrent.api.annotation.ApplicationAnnotation;
  
  import static org.apache.apex.malhar.stream.api.Option.Options.name;
  
  /**
   * An application example with stream api
   */
  @ApplicationAnnotation(name = "WordCountStreamingApiDemo")
  public class ApplicationWithStreamAPI implements StreamingApplication
  {
  
    @Override
    public void populateDAG(DAG dag, Configuration configuration)
    {
      String localFolder = "./src/test/resources/data";
      ApexStream<String> stream = StreamFactory
          .fromFolder(localFolder)
          .flatMap(new Function.FlatMapFunction<String, String>()
          {
            @Override
            public Iterable<String> f(String input)
            {
              return Arrays.asList(input.split("[\\p{Punct}\\s]+"));
            }
          });
      stream.print(name("WordOutput"));
      stream.window(new WindowOption.GlobalWindow(), new TriggerOption().withEarlyFiringsAtEvery(Duration
          .millis(1000)).accumulatingFiredPanes()).countByKey(new Function.ToKeyValue<String, String, Long>()
          {
            @Override
            public Tuple<KeyValPair<String, Long>> f(String input)
            {
              return new Tuple.PlainTuple(new KeyValPair<>(input, 1L));
            }
          }).print(name("WCOutput"));
      stream.populateDag(dag);
  
    }
  }
  