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[FLINK-1358] [streaming] Streaming added to the quickstarts
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...-java/src/main/resources/archetype-resources/src/main/java/SocketTextStreamWordCount.java
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package ${package}; | ||
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/* | ||
* 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 | ||
* | ||
* https://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. | ||
*/ | ||
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import org.apache.flink.api.common.functions.FlatMapFunction; | ||
import org.apache.flink.api.java.tuple.Tuple2; | ||
import org.apache.flink.streaming.api.datastream.DataStream; | ||
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; | ||
import org.apache.flink.util.Collector; | ||
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/** | ||
* This example shows an implementation of WordCount with data from a text | ||
* socket. To run the example make sure that the service providing the text data | ||
* is already up and running. | ||
* | ||
* <p> | ||
* To start an example socket text stream on your local machine run netcat from | ||
* a command line: <code>nc -lk 9999</code>, where the parameter specifies the | ||
* port number. | ||
* | ||
* | ||
* <p> | ||
* Usage: | ||
* <code>SocketTextStreamWordCount <hostname> <port> <result path></code> | ||
* <br> | ||
* | ||
* <p> | ||
* This example shows how to: | ||
* <ul> | ||
* <li>use StreamExecutionEnvironment.socketTextStream | ||
* <li>write a simple Flink program, | ||
* <li>write and use user-defined functions. | ||
* </ul> | ||
* | ||
* @see <a href="www.openbsd.org/cgi-bin/man.cgi?query=nc">netcat</a> | ||
*/ | ||
public class SocketTextStreamWordCount { | ||
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// | ||
// Program | ||
// | ||
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public static void main(String[] args) throws Exception { | ||
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String hostName = args[0]; | ||
Integer port = Integer.parseInt(args[1]); | ||
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// set up the execution environment | ||
final StreamExecutionEnvironment env = StreamExecutionEnvironment | ||
.getExecutionEnvironment(); | ||
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// get input data | ||
DataStream<String> text = env.socketTextStream(hostName, port); | ||
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DataStream<Tuple2<String, Integer>> counts = | ||
// split up the lines in pairs (2-tuples) containing: (word,1) | ||
text.flatMap(new LineSplitter()) | ||
// group by the tuple field "0" and sum up tuple field "1" | ||
.groupBy(0) | ||
.sum(1); | ||
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counts.print(); | ||
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// execute program | ||
env.execute("WordCount from SocketTextStream Example"); | ||
} | ||
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// | ||
// User Functions | ||
// | ||
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/** | ||
* Implements the string tokenizer that splits sentences into words as a user-defined | ||
* FlatMapFunction. The function takes a line (String) and splits it into | ||
* multiple pairs in the form of "(word,1)" (Tuple2<String, Integer>). | ||
*/ | ||
public static final class LineSplitter implements FlatMapFunction<String, Tuple2<String, Integer>> { | ||
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@Override | ||
public void flatMap(String value, Collector<Tuple2<String, Integer>> out) { | ||
// normalize and split the line | ||
String[] tokens = value.toLowerCase().split("\\W+"); | ||
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// emit the pairs | ||
for (String token : tokens) { | ||
if (token.length() > 0) { | ||
out.collect(new Tuple2<String, Integer>(token, 1)); | ||
} | ||
} | ||
} | ||
} | ||
} |
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66 changes: 66 additions & 0 deletions
66
...ala/src/main/resources/archetype-resources/src/main/scala/SocketTextStreamWordCount.scala
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package ${package} | ||
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/* | ||
* 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 | ||
* | ||
* https://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. | ||
*/ | ||
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import org.apache.flink.streaming.api.scala._ | ||
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/** | ||
* This example shows an implementation of WordCount with data from a text socket. | ||
* To run the example make sure that the service providing the text data is already up and running. | ||
* | ||
* To start an example socket text stream on your local machine run netcat from a command line, | ||
* where the parameter specifies the port number: | ||
* | ||
* {{{ | ||
* nc -lk 9999 | ||
* }}} | ||
* | ||
* Usage: | ||
* {{{ | ||
* SocketTextStreamWordCount <hostname> <port> <output path> | ||
* }}} | ||
* | ||
* This example shows how to: | ||
* | ||
* - use StreamExecutionEnvironment.socketTextStream | ||
* - write a simple Flink Streaming program in scala. | ||
* - write and use user-defined functions. | ||
*/ | ||
object SocketTextStreamWordCount { | ||
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def main(args: Array[String]) { | ||
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val hostName = args(0) | ||
val port = args(1).toInt | ||
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val env = StreamExecutionEnvironment.getExecutionEnvironment | ||
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//Create streams for names and ages by mapping the inputs to the corresponding objects | ||
val text = env.socketTextStream(hostName, port) | ||
val counts = text.flatMap { _.toLowerCase.split("\\W+") filter { _.nonEmpty } } | ||
.map { (_, 1) } | ||
.groupBy(0) | ||
.sum(1) | ||
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counts print | ||
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env.execute("Scala SocketTextStreamWordCount Example") | ||
} | ||
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} |
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