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[FLINK-1173] [streaming] Add socket text stream as a data source for …
…the streaming API
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69 changes: 69 additions & 0 deletions
69
...rc/main/java/org/apache/flink/streaming/api/function/source/SocketTextStreamFunction.java
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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 | ||
| * | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.streaming.api.function.source; | ||
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| import org.apache.flink.util.Collector; | ||
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| import java.io.BufferedReader; | ||
| import java.io.InputStreamReader; | ||
| import java.net.Socket; | ||
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| public class SocketTextStreamFunction implements SourceFunction<String> { | ||
| private static final long serialVersionUID = 1L; | ||
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| private String hostname; | ||
| private int port; | ||
| private char delimiter; | ||
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| public SocketTextStreamFunction(String hostname, int port, char delimiter) { | ||
| this.hostname = hostname; | ||
| this.port = port; | ||
| this.delimiter = delimiter; | ||
| } | ||
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| @Override | ||
| public void invoke(Collector<String> collector) throws Exception { | ||
| Socket socket = new Socket(hostname, port); | ||
| while (!socket.isClosed() && socket.isConnected()) { | ||
| streamFromSocket(collector, socket); | ||
| } | ||
| } | ||
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| public void streamFromSocket(Collector<String> collector, Socket socket) throws Exception { | ||
| StringBuffer buffer = new StringBuffer(); | ||
| BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); | ||
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| while (true) { | ||
| int data = reader.read(); | ||
| if (!socket.isConnected() || socket.isClosed() || data == -1) { | ||
| break; | ||
| } | ||
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| if (data == delimiter) { | ||
| collector.collect(buffer.toString()); | ||
| buffer = new StringBuffer(); | ||
| } else if (data != '\r') { // ignore carriage return | ||
| buffer.append((char) data); | ||
| } | ||
| } | ||
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| if (buffer.length() > 0) { | ||
| collector.collect(buffer.toString()); | ||
| } | ||
| } | ||
| } |
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100 changes: 100 additions & 0 deletions
100
...rc/main/java/org/apache/flink/streaming/examples/wordcount/SocketTextStreamWordCount.java
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| @@ -0,0 +1,100 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.streaming.examples.wordcount; | ||
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| import org.apache.flink.api.java.tuple.Tuple2; | ||
| import org.apache.flink.streaming.api.datastream.DataStream; | ||
| import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; | ||
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| /** | ||
| * This example shows an implementation of WordCount with data from socket. | ||
| * | ||
| * <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> | ||
| */ | ||
| public class SocketTextStreamWordCount { | ||
| public static void main(String[] args) throws Exception { | ||
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| if (!parseParameters(args)) { | ||
| return; | ||
| } | ||
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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 WordCount.Tokenizer()) | ||
| // group by the tuple field "0" and sum up tuple field "1" | ||
| .groupBy(0).sum(1); | ||
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| if (fileOutput) { | ||
| counts.writeAsText(outputPath, 1); | ||
| } else { | ||
| counts.print(); | ||
| } | ||
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| // execute program | ||
| env.execute("WordCount with SocketTextStream Example"); | ||
| } | ||
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| // ************************************************************************* | ||
| // UTIL METHODS | ||
| // ************************************************************************* | ||
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| private static boolean fileOutput = false; | ||
| private static String hostname; | ||
| private static int port; | ||
| private static String outputPath; | ||
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| private static boolean parseParameters(String[] args) { | ||
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| if (args.length > 0) { | ||
| // parse input arguments | ||
| if (args.length == 3) { | ||
| fileOutput = true; | ||
| hostname = args[0]; | ||
| port = Integer.valueOf(args[1]); | ||
| outputPath = args[2]; | ||
| } else if (args.length == 2) { | ||
| hostname = args[0]; | ||
| port = Integer.valueOf(args[1]); | ||
| } else { | ||
| System.err.println("Usage: SocketTextStreamWordCount <hostname> <port> <output path>"); | ||
| return false; | ||
| } | ||
| } else { | ||
| System.out.println("Executing WordCount example with data from socket."); | ||
| System.out.println(" Provide parameters to connect data source."); | ||
| System.out.println(" Usage: SocketTextStreamWordCount <hostname> <port> <output path>"); | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
| } |