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Receiving Events via File

Purpose:

This application demonstrates how to use siddhi-io-file for receiving.

Prerequisites:

  1. Edit this sample file by replacing {WSO2SIHome} with the absolute path of your WSO2SI home directory.
  2. Save this sample.

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.
    ReceiveEventsFromFile.siddhi - Started Successfully!
  3. Check the directories {WSO2SIHome}/samples/artifacts/ReceiveEventsFromFile/files/consumed and new.
  4. All the files which were in the directory new should have been moved to consumed directory.

Note:

If the sample is not running and producing output, do the following first. * Move all the files in {WSO2SIHome}/samples/artifacts/ReceiveEventsFromFile/files/consumed directory to {WSO2SIHome}/samples/artifacts/ReceiveEventsFromFile/files/new. * Delete all the files in consumed and sink directories.

Viewing the Results:

Processed output events will be logged in the console as follows:

INFO {io.siddhi.core.query.processor.stream.LogStreamProcessor} - ReceiveEventsFromFile: event, StreamEvent{ timestamp=1513847875990, beforeWindowData=null, onAfterWindowData=null, outputData=[apache, 80.0, 2.0], type=CURRENT, next=null}
INFO {io.siddhi.core.query.processor.stream.LogStreamProcessor} - ReceiveEventsFromFile: event, StreamEvent{ timestamp=1513847876004, beforeWindowData=null, onAfterWindowData=null, outputData=[cloudbees, 134.4, 2.0], type=CURRENT, next=null}

@App:name('ReceiveEventsFromFile')


@source(type='file', mode='text.full',
dir.uri='file:/{WSO2SIHome}/samples/artifacts/ReceiveEventsFromFile/files/new',
action.after.process='move',
tailing='false',
move.after.process='file:/{WSO2SIHome}/samples/artifacts/ReceiveEventsFromFile/files/consumed',
@map(type='json'))
define stream SweetProductionStream (name string, amount double);

from SweetProductionStream#window.time(1 min)
select name, sum(amount) as hourlyTotal, convert(time:extract('HOUR', time:currentTimestamp(), 'yyyy-MM-dd hh:mm:ss'), 'double') as currentHour
insert into LowProductionAlertStream;

from LowProductionAlertStream#log('event')
insert into LogStream;
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