| /* |
| 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.edgent.samples.topology; |
| |
| import java.util.Random; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.edgent.execution.Job; |
| import org.apache.edgent.providers.direct.DirectProvider; |
| import org.apache.edgent.topology.TStream; |
| import org.apache.edgent.topology.Topology; |
| |
| public class SimpleFilterTransform { |
| public static void main(String[] args) throws Exception { |
| |
| DirectProvider tp = new DirectProvider(); |
| |
| Topology t = tp.newTopology("SimpleFilterTransform"); |
| |
| Random r = new Random(); |
| TStream<Double> gaussian = t.generate(() -> r.nextGaussian()); |
| |
| // testing Peek! |
| gaussian = gaussian.peek(g -> System.out.println("R:" + g)); |
| |
| // A filter |
| gaussian = gaussian.filter(g -> g > 0.5); |
| |
| // A transformation |
| TStream<String> gs = gaussian.map(g -> "G:" + g + ":"); |
| gs.print(); |
| |
| // Submit the job, then close it after a while |
| Future<Job> futureJob = tp.submit(t); |
| Job job = futureJob.get(); |
| Thread.sleep(TimeUnit.SECONDS.toMillis(5)); |
| job.stateChange(Job.Action.CLOSE); |
| } |
| } |