| /* |
| * 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.learning.katas.triggers.eventtimetriggers; |
| |
| import static org.apache.beam.sdk.values.TypeDescriptors.strings; |
| |
| import org.apache.beam.sdk.io.GenerateSequence; |
| import org.apache.beam.sdk.transforms.MapElements; |
| import org.apache.beam.sdk.transforms.PTransform; |
| import org.apache.beam.sdk.values.PBegin; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.joda.time.Duration; |
| |
| public class GenerateEvent extends PTransform<PBegin, PCollection<String>> { |
| |
| static GenerateEvent everySecond() { |
| return new GenerateEvent(); |
| } |
| |
| public PCollection<String> expand(PBegin input) { |
| return input |
| .apply(GenerateSequence.from(1).withRate(1, Duration.standardSeconds(1))) |
| .apply(MapElements.into(strings()).via(num -> "event")); |
| } |
| |
| } |