Package org.apache.flink.streaming.examples.basictopology

Source Code of org.apache.flink.streaming.examples.basictopology.BasicTopology$IdentityMap

/*
* 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.flink.streaming.examples.basictopology;

import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.examples.java.wordcount.util.WordCountData;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

public class BasicTopology {

  public static class IdentityMap implements MapFunction<String, String> {
    private static final long serialVersionUID = 1L;
    // map to the same value
    @Override
    public String map(String value) throws Exception {
      return value;
    }

  }

  private static final int PARALLELISM = 1;

  public static void main(String[] args) throws Exception {
    StreamExecutionEnvironment env = StreamExecutionEnvironment
        .createLocalEnvironment(PARALLELISM);

    DataStream<String> stream = env.fromElements(WordCountData.WORDS).map(new IdentityMap());

    stream.print();

    env.execute();
  }
}
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