| /* |
| * 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.rocketmq.streams.examples.window; |
| |
| import org.apache.rocketmq.common.MixAll; |
| import org.apache.rocketmq.streams.core.RocketMQStream; |
| import org.apache.rocketmq.streams.core.rstream.StreamBuilder; |
| import org.apache.rocketmq.streams.core.window.Time; |
| import org.apache.rocketmq.streams.core.window.WindowBuilder; |
| import org.apache.rocketmq.streams.core.topology.TopologyBuilder; |
| import org.apache.rocketmq.streams.core.util.Pair; |
| |
| import java.nio.charset.StandardCharsets; |
| import java.util.Properties; |
| |
| /** |
| * 1、启动RocketMQ |
| * 2、创建topic |
| * 3、启动本例子运行 |
| * 4、向topic中写入数据 |
| * 5、观察输出结果 |
| */ |
| public class SlideWindowCount { |
| public static void main(String[] args) { |
| StreamBuilder builder = new StreamBuilder("slideWindowCount"); |
| builder.source("windowCount", source -> { |
| String value = new String(source, StandardCharsets.UTF_8); |
| int result = Integer.parseInt(value); |
| return new Pair<>(null, result); |
| }) |
| .filter(value -> value > 0) |
| .keyBy(value -> "key") |
| .window(WindowBuilder.slidingWindow(Time.seconds(5), Time.seconds(2))) |
| .count() |
| .toRStream() |
| .print(); |
| |
| TopologyBuilder topologyBuilder = builder.build(); |
| |
| Properties properties = new Properties(); |
| properties.putIfAbsent(MixAll.NAMESRV_ADDR_PROPERTY, "127.0.0.1:9876"); |
| |
| RocketMQStream rocketMQStream = new RocketMQStream(topologyBuilder, properties); |
| Runtime.getRuntime().addShutdownHook(new Thread("wordcount-shutdown-hook") { |
| @Override |
| public void run() { |
| rocketMQStream.stop(); |
| } |
| }); |
| |
| rocketMQStream.start(); |
| } |
| |
| } |