| /* |
| * 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.nemo.examples.beam; |
| |
| import org.apache.beam.sdk.Pipeline; |
| import org.apache.beam.sdk.io.GenerateSequence; |
| import org.apache.beam.sdk.options.PipelineOptions; |
| import org.apache.beam.sdk.transforms.*; |
| import org.apache.beam.sdk.transforms.windowing.FixedWindows; |
| import org.apache.beam.sdk.transforms.windowing.SlidingWindows; |
| import org.apache.beam.sdk.transforms.windowing.Window; |
| import org.apache.beam.sdk.values.KV; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.joda.time.Duration; |
| import org.joda.time.Instant; |
| |
| /** |
| * A Windowed WordCount application. |
| */ |
| public final class WindowedWordCount { |
| /** |
| * Private Constructor. |
| */ |
| private WindowedWordCount() { |
| } |
| |
| public static final String INPUT_TYPE_BOUNDED = "bounded"; |
| public static final String INPUT_TYPE_UNBOUNDED = "unbounded"; |
| private static final String SPLITTER = "!"; |
| |
| |
| /** |
| * @param p pipeline. |
| * @param args arguments. |
| * @return source. |
| */ |
| private static PCollection<KV<String, Long>> getSource( |
| final Pipeline p, |
| final String[] args) { |
| |
| final String inputType = args[2]; |
| if (inputType.compareTo(INPUT_TYPE_BOUNDED) == 0) { |
| final String inputFilePath = args[3]; |
| return GenericSourceSink.read(p, inputFilePath) |
| .apply(ParDo.of(new DoFn<String, String>() { |
| @ProcessElement |
| public void processElement(@Element final String elem, |
| final OutputReceiver<String> out) { |
| final String[] splitt = elem.split(SPLITTER); |
| out.outputWithTimestamp(splitt[0], new Instant(Long.valueOf(splitt[1]))); |
| } |
| })) |
| .apply(MapElements.<String, KV<String, Long>>via(new SimpleFunction<String, KV<String, Long>>() { |
| @Override |
| public KV<String, Long> apply(final String line) { |
| final String[] words = line.split(" +"); |
| final String documentId = words[0] + "#" + words[1]; |
| final Long count = Long.parseLong(words[2]); |
| return KV.of(documentId, count); |
| } |
| })); |
| } else if (inputType.compareTo(INPUT_TYPE_UNBOUNDED) == 0) { |
| // unbounded |
| return p.apply(GenerateSequence |
| .from(1) |
| .withRate(2, Duration.standardSeconds(1)) |
| .withTimestampFn(num -> new Instant(num * 500))) // 0.5 second between subsequent elements |
| .apply(MapElements.via(new SimpleFunction<Long, KV<String, Long>>() { |
| @Override |
| public KV<String, Long> apply(final Long val) { |
| return KV.of(String.valueOf(val % 2), 1L); |
| } |
| })); |
| } else { |
| throw new RuntimeException("Unsupported input type: " + inputType); |
| } |
| } |
| |
| /** |
| * Main function for the MR BEAM program. |
| * |
| * @param args arguments. |
| */ |
| public static void main(final String[] args) { |
| final String outputFilePath = args[0]; |
| final String windowType = args[1]; |
| |
| final Window<KV<String, Long>> windowFn; |
| if (windowType.equals("fixed")) { |
| windowFn = Window.<KV<String, Long>>into(FixedWindows.of(Duration.standardSeconds(5))); |
| } else { |
| windowFn = Window.<KV<String, Long>>into(SlidingWindows.of(Duration.standardSeconds(10)) |
| .every(Duration.standardSeconds(5))); |
| } |
| |
| final PipelineOptions options = NemoPipelineOptionsFactory.create(); |
| options.setJobName("WindowedWordCount"); |
| |
| final Pipeline p = Pipeline.create(options); |
| |
| getSource(p, args) |
| .apply(windowFn) |
| .apply(Sum.longsPerKey()) |
| .apply(MapElements.<KV<String, Long>, String>via(new SimpleFunction<KV<String, Long>, String>() { |
| @Override |
| public String apply(final KV<String, Long> kv) { |
| return kv.getKey() + ": " + kv.getValue(); |
| } |
| })) |
| .apply(new WriteOneFilePerWindow(outputFilePath, 1)); |
| |
| p.run().waitUntilFinish(); |
| } |
| } |