[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
     
     
     
     
    1
    package sr
    2
    ​
    3
    /**
    4
    *
    5
    */
    6
    case class SensorReads(id:String,
    7
    timestap:Long,
    8
    tempture:Double)
     
     

  • 传感器 - 数据源模拟

    SnsorSrc_4096T.scala：

     
     
     
    46
     
     
     
     
    1
    package sr
    2
    ​
    3
    import org.apache.flink.streaming.api.functions.source.SourceFunction
    4
    import scala.util.Random
    5
    ​
    6
    /**
    7
    * period, is 4096 millis.
    8
    */
    9
    case class SnsorSrc_4096T extends SourceFunction[SensorReads] {
    10
    11
    var isInRunning: Boolean = true
    12
    13
    ////
    14
    override def run(sourceContext: SourceFunction.SourceContext[
    15
    SensorReads]): Unit = {
    16
    17
    18
    val rand: Random = new Random
    19
    20
    var tptNow4 =
    21
    (1 to 4).map(
    22
    "snsor_" + _.toString -> (23 + 16 * rand.nextGaussian))
    23
    ​
    24
    25
    26
    while (isInRunning) {
    27
    tptNow4 = tptNow4.map(
    28
    t => t._1 -> (t._2 + rand.nextGaussian))
    29
    30
    31
    val timeStampNow: Long = System.currentTimeMillis
    32
    33
    tptNow4.foreach{
    34
    t =>
    35
    sourceContext.collect( // O.U.T
    36
    SensorReads(t._1, timeStampNow, t._2) )
    37
    Thread.sleep(512)  }
    38
    //not set, is stm
    39
    40
    Thread.sleep(2048)  }
    41
    42
    }
    43
    44
    override def cancel(): Unit = isInRunning = false
    45
    46
    }
     
     

测试

SnsrSrcAappli.scala：

 
 
 
13
 
 
 
 
1
package applis
2
​
3
import org.apache.flink.streaming.api.scala._
4
import sr._
5
​
6
object SnsrSrcAappli extends App{
7
val env = StreamExecutionEnvironment.getExecutionEnvironment
8
9
env.addSource(SnsorSrc_4096T() )
10
.print("aaa")
11
12
env.execute()
13
}
 
 

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
 
 
 
 
1
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: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)
9
aaa:8> SensorReads(snsor_2,1573556709627,22.38746867201145)
10
aaa:1> SensorReads(snsor_3,1573556709627,20.45357507067989)
11
aaa:2> SensorReads(snsor_4,1573556709627,17.18467261133715)
12
aaa:3> SensorReads(snsor_1,1573556713729,31.686487593592904)
13
aaa:4> SensorReads(snsor_2,1573556713729,20.67106361911623)
14
aaa:5> SensorReads(snsor_3,1573556713729,21.27724215221553)
15
aaa:6> SensorReads(snsor_4,1573556713729,16.84273306583804)
16
​
17
Process finished with exit code -1
 
 

...

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

 
 
 
5
 
 
 
 
1
tptNow4.foreach{
2
t =>
3
sourceContext.collect( // O.U.T
4
SensorReads(t._1, System.currentTimeMillis, t._2) )
5
Thread.sleep(512)  }
 
 

那么结果就会是：

 
 
 
25
 
 
 
 
1
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)
11
aaa:4> SensorReads(snsor_4,1573561937864,42.37076203420432)
12
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)
15
aaa:8> SensorReads(snsor_4,1573561941963,42.969281620777075)
16
aaa:1> SensorReads(snsor_1,1573561944525,20.659855873131406)
17
aaa:2> SensorReads(snsor_2,1573561945038,19.437515708059177)
18
aaa:3> SensorReads(snsor_3,1573561945550,18.336847248220565)
19
aaa:4> SensorReads(snsor_4,1573561946063,43.58727112744526)
20
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)
24
​
25
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....

赞 (0)

相关推荐