| /* |
| * 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.beam.runners.flink.streaming; |
| |
| import java.io.File; |
| import java.io.Serializable; |
| import java.util.Arrays; |
| import org.apache.beam.runners.flink.FlinkPipelineOptions; |
| import org.apache.beam.runners.flink.FlinkTestPipeline; |
| import org.apache.beam.sdk.Pipeline; |
| import org.apache.beam.sdk.io.TextIO; |
| import org.apache.beam.sdk.transforms.Create; |
| import org.apache.beam.sdk.transforms.DoFn; |
| import org.apache.beam.sdk.transforms.GroupByKey; |
| import org.apache.beam.sdk.transforms.ParDo; |
| import org.apache.beam.sdk.transforms.windowing.AfterWatermark; |
| import org.apache.beam.sdk.transforms.windowing.FixedWindows; |
| import org.apache.beam.sdk.transforms.windowing.Window; |
| import org.apache.beam.sdk.values.KV; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.base.Joiner; |
| import org.apache.flink.test.util.AbstractTestBase; |
| import org.joda.time.Duration; |
| import org.joda.time.Instant; |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Test; |
| |
| /** Test for GroupByNullKey. */ |
| public class GroupByNullKeyTest extends AbstractTestBase implements Serializable { |
| |
| protected String resultDir; |
| protected String resultPath; |
| |
| static final String[] EXPECTED_RESULT = |
| new String[] {"k: null v: user1 user1 user1 user2 user2 user2 user2 user3"}; |
| |
| public GroupByNullKeyTest() {} |
| |
| @Before |
| public void preSubmit() throws Exception { |
| // Beam Write will add shard suffix to fileName, see ShardNameTemplate. |
| // So tempFile need have a parent to compare. |
| File resultParent = createAndRegisterTempFile("result"); |
| resultDir = resultParent.toURI().toString(); |
| resultPath = new File(resultParent, "file.txt").getAbsolutePath(); |
| } |
| |
| @After |
| public void postSubmit() throws Exception { |
| compareResultsByLinesInMemory(Joiner.on('\n').join(EXPECTED_RESULT), resultDir); |
| } |
| |
| /** DoFn extracting user and timestamp. */ |
| private static class ExtractUserAndTimestamp extends DoFn<KV<Integer, String>, String> { |
| @ProcessElement |
| public void processElement(ProcessContext c) { |
| KV<Integer, String> record = c.element(); |
| int timestamp = record.getKey(); |
| String userName = record.getValue(); |
| if (userName != null) { |
| // Sets the implicit timestamp field to be used in windowing. |
| c.outputWithTimestamp(userName, new Instant(timestamp)); |
| } |
| } |
| } |
| |
| // suppress since toString() of Void is called and key is deliberately null |
| @SuppressWarnings("ObjectToString") |
| @Test |
| public void testProgram() throws Exception { |
| |
| Pipeline p = FlinkTestPipeline.createForStreaming(); |
| p.getOptions().as(FlinkPipelineOptions.class).setParallelism(1); |
| |
| PCollection<String> output = |
| p.apply( |
| Create.of( |
| Arrays.asList( |
| KV.of(0, "user1"), |
| KV.of(1, "user1"), |
| KV.of(2, "user1"), |
| KV.of(10, "user2"), |
| KV.of(1, "user2"), |
| KV.of(15000, "user2"), |
| KV.of(12000, "user2"), |
| KV.of(25000, "user3")))) |
| .apply(ParDo.of(new ExtractUserAndTimestamp())) |
| .apply( |
| Window.<String>into(FixedWindows.of(Duration.standardHours(1))) |
| .triggering(AfterWatermark.pastEndOfWindow()) |
| .withAllowedLateness(Duration.ZERO) |
| .discardingFiredPanes()) |
| .apply( |
| ParDo.of( |
| new DoFn<String, KV<Void, String>>() { |
| @ProcessElement |
| public void processElement(ProcessContext c) throws Exception { |
| String elem = c.element(); |
| c.output(KV.of(null, elem)); |
| } |
| })) |
| .apply(GroupByKey.create()) |
| .apply( |
| ParDo.of( |
| new DoFn<KV<Void, Iterable<String>>, String>() { |
| @ProcessElement |
| public void processElement(ProcessContext c) throws Exception { |
| KV<Void, Iterable<String>> elem = c.element(); |
| StringBuilder str = new StringBuilder(); |
| str.append("k: " + elem.getKey() + " v:"); |
| for (String v : elem.getValue()) { |
| str.append(" " + v); |
| } |
| c.output(str.toString()); |
| } |
| })); |
| output.apply(TextIO.write().to(resultPath)); |
| p.run(); |
| } |
| } |