[Flink]测试用的fake温度传感器

Flink-测试用的fake温度传感器

Flink中，测试时，会用到自定义的source。

下为一例。。 该例使用温度传感器的格式演示fake日志数据源。

代码用Scala写的。

传感器...

• 传感器 - 样例类

  SensorReads.scala：

   

   

   

  ​x

   

   

   

   

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  package sr

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  ​

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  /**

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   * 

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   */

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  case class SensorReads(id:String,

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                         timestap:Long,

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                         tempture:Double)

   

   

• 传感器 - 数据源模拟

  SnsorSrc_4096T.scala：

   

   

   

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  package sr

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  ​

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  import org.apache.flink.streaming.api.functions.source.SourceFunction

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  import scala.util.Random

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  ​

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  /**

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   * period, is 4096 millis.

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   */

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  case class SnsorSrc_4096T extends SourceFunction[SensorReads] {

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      var isInRunning: Boolean = true

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      ////

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      override def run(sourceContext: SourceFunction.SourceContext[

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              SensorReads]): Unit = {

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          val rand: Random = new Random

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          var tptNow4 =

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              (1 to 4).map(

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                  "snsor_" + _.toString -> (23 + 16 * rand.nextGaussian))

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  ​

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          while (isInRunning) {

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              tptNow4 = tptNow4.map(

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                  t => t._1 -> (t._2 + rand.nextGaussian))

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              val timeStampNow: Long = System.currentTimeMillis

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              tptNow4.foreach{

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                  t =>

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                      sourceContext.collect( // O.U.T

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                          SensorReads(t._1, timeStampNow, t._2) )

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                  Thread.sleep(512)  }

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              //not set, is stm

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              Thread.sleep(2048)  }

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      }

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      override def cancel(): Unit = isInRunning = false

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  }

   

   

测试

SnsrSrcAappli.scala：

 

 

 

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package applis

2

​

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import org.apache.flink.streaming.api.scala._

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import sr._

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​

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object SnsrSrcAappli extends App{

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    val env = StreamExecutionEnvironment.getExecutionEnvironment

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    env.addSource(SnsorSrc_4096T() )

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                    .print("aaa")

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    env.execute()

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}

 

 

数据源模拟用case-class，此处使用则可以不写new。

输出

IDEA控制台上run：

 

 

 

17

 

 

 

 

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log4j:WARN No appenders could be found for logger (org.apache.flink.api.scala.ClosureCleaner$).

2

log4j:WARN Please initialize the log4j system properly.

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log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

4

aaa:3> SensorReads(snsor_1,1573556705508,30.383394411578916)

5

aaa:4> SensorReads(snsor_2,1573556705508,21.397405872448672)

6

aaa:5> SensorReads(snsor_3,1573556705508,20.598086139457727)

7

aaa:6> SensorReads(snsor_4,1573556705508,18.30066983735531)

8

aaa:7> SensorReads(snsor_1,1573556709627,30.120955223032546)

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aaa:8> SensorReads(snsor_2,1573556709627,22.38746867201145)

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aaa:1> SensorReads(snsor_3,1573556709627,20.45357507067989)

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aaa:2> SensorReads(snsor_4,1573556709627,17.18467261133715)

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aaa:3> SensorReads(snsor_1,1573556713729,31.686487593592904)

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aaa:4> SensorReads(snsor_2,1573556713729,20.67106361911623)

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aaa:5> SensorReads(snsor_3,1573556713729,21.27724215221553)

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aaa:6> SensorReads(snsor_4,1573556713729,16.84273306583804)

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​

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Process finished with exit code -1

 

 

...

如果SnsorSrc_4096T.scala中，「当前温度」.foreach这样写：

 

 

 

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tptNow4.foreach{

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    t =>

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        sourceContext.collect( // O.U.T

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            SensorReads(t._1, System.currentTimeMillis, t._2) )

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    Thread.sleep(512)  }

 

 

那么结果就会是：

 

 

 

25

 

 

 

 

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log4j:WARN No appenders could be found for logger (org.apache.flink.api.scala.ClosureCleaner$).

2

log4j:WARN Please initialize the log4j system properly.

3

log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

4

aaa:5> SensorReads(snsor_1,1573561932216,20.427373784204445)

5

aaa:6> SensorReads(snsor_2,1573561932739,19.043151948599565)

6

aaa:7> SensorReads(snsor_3,1573561933251,16.506314894849734)

7

aaa:8> SensorReads(snsor_4,1573561933764,42.18791135873409)

8

aaa:1> SensorReads(snsor_1,1573561936326,20.216273863226476)

9

aaa:2> SensorReads(snsor_2,1573561936838,19.77488458362011)

10

aaa:3> SensorReads(snsor_3,1573561937351,17.49661332626548)

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aaa:4> SensorReads(snsor_4,1573561937864,42.37076203420432)

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aaa:5> SensorReads(snsor_1,1573561940425,19.582646754534526)

13

aaa:6> SensorReads(snsor_2,1573561940938,18.148182987020572)

14

aaa:7> SensorReads(snsor_3,1573561941451,17.028248074961432)

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aaa:8> SensorReads(snsor_4,1573561941963,42.969281620777075)

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aaa:1> SensorReads(snsor_1,1573561944525,20.659855873131406)

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aaa:2> SensorReads(snsor_2,1573561945038,19.437515708059177)

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aaa:3> SensorReads(snsor_3,1573561945550,18.336847248220565)

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aaa:4> SensorReads(snsor_4,1573561946063,43.58727112744526)

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aaa:5> SensorReads(snsor_1,1573561948625,19.317498008380674)

21

aaa:6> SensorReads(snsor_2,1573561949137,21.86602577501872)

22

aaa:7> SensorReads(snsor_3,1573561949650,19.109322091177216)

23

aaa:8> SensorReads(snsor_4,1573561950163,43.48043890977487)

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​

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Process finished with exit code -1

 

 

这样一来事件时间就都不一样了。 可根据需要模拟的情况改动....