| /* |
| * 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. |
| */ |
| |
| import java.util.Arrays; |
| import org.apache.beam.sdk.Pipeline; |
| import org.apache.beam.sdk.options.PipelineOptions; |
| import org.apache.beam.sdk.options.PipelineOptionsFactory; |
| import org.apache.beam.sdk.transforms.Count; |
| import org.apache.beam.sdk.transforms.Create; |
| import org.apache.beam.sdk.transforms.DoFn; |
| import org.apache.beam.sdk.transforms.FlatMapElements; |
| import org.apache.beam.sdk.transforms.ParDo; |
| import org.apache.beam.sdk.values.KV; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.apache.beam.sdk.values.TypeDescriptors; |
| import util.Log; |
| |
| class Task { |
| |
| public static void main(String[] args) { |
| String[] lines = { |
| "apple orange grape banana apple banana", |
| "banana orange banana papaya" |
| }; |
| |
| PipelineOptions options = PipelineOptionsFactory.fromArgs(args).create(); |
| Pipeline pipeline = Pipeline.create(options); |
| |
| PCollection<String> wordCounts = |
| pipeline.apply(Create.of(Arrays.asList(lines))); |
| |
| PCollection<String> output = applyTransform(wordCounts); |
| |
| output.apply(Log.ofElements()); |
| |
| pipeline.run(); |
| } |
| |
| static PCollection<String> applyTransform(PCollection<String> input) { |
| return input |
| |
| .apply(FlatMapElements.into(TypeDescriptors.strings()) |
| .via(line -> Arrays.asList(line.split(" ")))) |
| |
| .apply(Count.perElement()) |
| |
| .apply(ParDo.of(new DoFn<KV<String, Long>, String>() { |
| |
| @ProcessElement |
| public void processElement( |
| @Element KV<String, Long> element, OutputReceiver<String> out) { |
| |
| out.output(element.getKey() + ":" + element.getValue()); |
| } |
| |
| })); |
| } |
| |
| } |