/*
* 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();
}
}