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[ISSUE apache#251]Support avg function in WindowStream
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82 changes: 82 additions & 0 deletions
82
core/src/main/java/org/apache/rocketmq/streams/core/function/accumulator/AvgAccumulator.java
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|---|---|---|
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| /* | ||
| * 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.core.function.accumulator; | ||
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| import java.util.Properties; | ||
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| public class AvgAccumulator<V> implements Accumulator<V, Double> { | ||
| private Double avg; | ||
| private Integer num; | ||
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| @Override | ||
| public void addValue(V value) { | ||
| if (value instanceof Number) { | ||
| Number number = (Number) value; | ||
| Double valueToDouble = number.doubleValue(); | ||
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| if (avg == null) { | ||
| avg = valueToDouble; | ||
| num = 1; | ||
| } else { | ||
| avg = avg + (valueToDouble - avg) / (num + 1); | ||
| num++; | ||
| } | ||
| } else { | ||
| throw new IllegalArgumentException("Calculate avg, input is not a number. value=" + value); | ||
| } | ||
| } | ||
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| @Override | ||
| public void merge(Accumulator<V, Double> other) { | ||
| if (other instanceof AvgAccumulator) { | ||
| AvgAccumulator<V> otherAvgAccumulator = (AvgAccumulator) other; | ||
| Integer numOther = otherAvgAccumulator.getNum(); | ||
| Double avgOther = otherAvgAccumulator.getAvg(); | ||
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| avg = avg + numOther / (num + numOther) * (avgOther - avg); | ||
| num = num + numOther; | ||
| } else { | ||
| throw new IllegalArgumentException("Merge avg, input is not a AvgAccumulator."); | ||
| } | ||
| } | ||
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| @Override | ||
| public Double result(Properties context) { | ||
| return avg; | ||
| } | ||
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| @Override | ||
| public Accumulator<V, Double> clone() { | ||
| return new AvgAccumulator<>(); | ||
| } | ||
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| public Double getAvg() { | ||
| return avg; | ||
| } | ||
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| public void setAvg(Double avg) { | ||
| this.avg = avg; | ||
| } | ||
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| public Integer getNum() { | ||
| return num; | ||
| } | ||
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| public void setNum(Integer num) { | ||
| this.num = num; | ||
| } | ||
| } |
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66 changes: 66 additions & 0 deletions
66
example/src/main/java/org/apache/rocketmq/streams/examples/window/WindowAvg.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| /* | ||
| * 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; | ||
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| import org.apache.rocketmq.common.MixAll; | ||
| import org.apache.rocketmq.streams.core.RocketMQStream; | ||
| import org.apache.rocketmq.streams.core.common.Constant; | ||
| import org.apache.rocketmq.streams.core.rstream.StreamBuilder; | ||
| import org.apache.rocketmq.streams.core.topology.TopologyBuilder; | ||
| import org.apache.rocketmq.streams.core.util.Pair; | ||
| import org.apache.rocketmq.streams.core.window.Time; | ||
| import org.apache.rocketmq.streams.core.window.TimeType; | ||
| import org.apache.rocketmq.streams.core.window.WindowBuilder; | ||
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| import java.nio.charset.StandardCharsets; | ||
| import java.time.LocalTime; | ||
| import java.util.Properties; | ||
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| /** | ||
| * 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 WindowAvg { | ||
| public static void main(String[] args) { | ||
| StreamBuilder builder = new StreamBuilder("WindowAvg"); | ||
| builder.source("avgSource", source -> { | ||
| String value = new String(source, StandardCharsets.UTF_8); | ||
| Integer num = Integer.parseInt(value); | ||
| return new Pair<>(null, num); | ||
| }).foreach(value -> System.out.println(String.format("time:%s, input:%d", LocalTime.now(), value))) | ||
| .filter(value -> value > 0) | ||
| .keyBy(value -> "key") | ||
| .window(WindowBuilder.tumblingWindow(Time.seconds(15))) | ||
| .avg() | ||
| .toRStream() | ||
| .print(); | ||
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| TopologyBuilder topologyBuilder = builder.build(); | ||
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| Properties properties = new Properties(); | ||
| properties.putIfAbsent(MixAll.NAMESRV_ADDR_PROPERTY, "127.0.0.1:9876"); | ||
| properties.put(Constant.TIME_TYPE, TimeType.PROCESS_TIME); | ||
| properties.put(Constant.ALLOW_LATENESS_MILLISECOND, 5000); | ||
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| RocketMQStream rocketMQStream = new RocketMQStream(topologyBuilder, properties); | ||
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| rocketMQStream.start(); | ||
| } | ||
| } |