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Converting Units

Purpose:

This sample demonstrates how to use unit conversion extension for converting units.

Prerequisites:

  • Save this sample. If there is no syntax error, the following messages would be shown on the console.

    * Siddhi App UnitConversionExtensionSample successfully deployed.

    Executing the Sample:

    1. Start the Siddhi application by clicking on 'Run'.
    2. If the Siddhi application starts successfully, the following messages would be shown on the console. 

      * UnitConversionExtensionSample.siddhi - Started Successfully!

Testing the Sample:

You can publish data event to the file, through event simulator

  1. Open event simulator by clicking on the second icon or press Ctrl+Shift+I.

  2. In the Single Simulation tab of the panel, select values as follows:

    • Siddhi App Name: UnitConversionExtensionSample
    • Stream name: SweetProductionStream

  3. Enter and send suitable values for the attributes of selected stream.

Viewing the Results:

Messages similar to the following would be shown on the console. 

INFO {io.siddhi.core.stream.output.sink.LogSink} - UnitConversionExtensionSample : WeightConvertedStream : Event{timestamp=1513588858315, data=[Chocolate, 1250.0], isExpired=false}


@App:name("UnitConversionExtensionSample")
@App:description('Demonstrates how to use unit conversion extension for converting units.')


define stream SweetProductionStream (name string, amount double);

@sink(type='log')
define stream WeightConvertedStream(name string, weightInGrams double);

from SweetProductionStream
select name, unitconversion:kgTog(amount) as  weightInGrams
insert into WeightConvertedStream;