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[streaming] WindowWordCount example added
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...examples/src/main/java/org/apache/flink/streaming/examples/windowing/WindowWordCount.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.examples.windowing; | ||
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| import org.apache.flink.api.java.tuple.Tuple2; | ||
| 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; | ||
| import org.apache.flink.streaming.api.windowing.helper.Count; | ||
| import org.apache.flink.streaming.examples.wordcount.WordCount; | ||
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| /** | ||
| * Implements a windowed version of the streaming "WordCount" program. | ||
| * | ||
| * <p> | ||
| * The input is a plain text file with lines separated by newline characters. | ||
| * | ||
| * <p> | ||
| * Usage: <code>WordCount <text path> <result path></code><br> | ||
| * If no parameters are provided, the program is run with default data from | ||
| * {@link org.apache.flink.examples.java.wordcount.util.WordCountData}. | ||
| * | ||
| * <p> | ||
| * This example shows how to: | ||
| * <ul> | ||
| * <li>write a simple Flink Streaming program, | ||
| * <li>use tuple data types, | ||
| * <li>use basic windowing abstractions. | ||
| * </ul> | ||
| * | ||
| */ | ||
| public class WindowWordCount { | ||
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| // ************************************************************************* | ||
| // PROGRAM | ||
| // ************************************************************************* | ||
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| 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 = getTextDataStream(env); | ||
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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()) | ||
| // create windows of 250 records slided every 150 records | ||
| .window(Count.of(250)).every(Count.of(150)) | ||
| // group by the tuple field "0" and sum up tuple field "1" | ||
| .groupBy(0).sum(1) | ||
| // flatten the windows to a single stream | ||
| .flatten(); | ||
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| // emit result | ||
| if (fileOutput) { | ||
| counts.writeAsText(outputPath); | ||
| } else { | ||
| counts.print(); | ||
| } | ||
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| // execute program | ||
| env.execute("WindowWordCount"); | ||
| } | ||
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| // ************************************************************************* | ||
| // UTIL METHODS | ||
| // ************************************************************************* | ||
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| private static boolean fileOutput = false; | ||
| private static String textPath; | ||
| 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 | ||
| fileOutput = true; | ||
| if (args.length == 2) { | ||
| textPath = args[0]; | ||
| outputPath = args[1]; | ||
| } else { | ||
| System.err.println("Usage: WindowWordCount <text path> <result path>"); | ||
| return false; | ||
| } | ||
| } else { | ||
| System.out.println("Executing WindowWordCount example with built-in default data."); | ||
| System.out.println(" Provide parameters to read input data from a file."); | ||
| System.out.println(" Usage: WindowWordCount <text path> <result path>"); | ||
| } | ||
| return true; | ||
| } | ||
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| private static DataStream<String> getTextDataStream(StreamExecutionEnvironment env) { | ||
| if (fileOutput) { | ||
| // read the text file from given input path | ||
| return env.readTextFile(textPath); | ||
| } else { | ||
| // get default test text data | ||
| return env.fromElements(WordCountData.WORDS); | ||
| } | ||
| } | ||
| } |
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