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Receiving JSON Events via TCP

Purpose

This application demonstrates how to configure WSO2 Integrator: SI to receive events to the SweetProductionStream via TCP transport in JSON format using default mapping and log the events in LowProductionAlertStream to the output console.

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.

    • Tcp Server started in 0.0.0.0:9892
    • ReceiveTCPinJSONFormat - Started Successfully!

Testing the sample

Navigate to <SI-Tooling-Home>/samples/sample-clients/tcp-client and run ant command as follows:

ant -Dtype=application/json

If you want to publish custom number of events, you need to run ant command as follows.

ant -Dtype=application/json -DnoOfEventsToSend=5

Notes

If the message Tcp Server started in 0.0.0.0:9892 does not appear, it could be due to the port 9892, defined in the Siddhi application is already being used by a different program. To resolve this issue, please do the following,

  • Stop this Siddhi application (Click 'Run' on menu bar -> 'Stop').
  • Change the port 9892 to an unused port, in this Siddhi application's source configuration.
  • Start the application and check whether the specified messages appear on the console.

Viewing the results

See the output. Following messages would be shown on the console.

INFO {io.siddhi.core.stream.output.sink.LogSink} - ReceiveTCPinJSONFormat : LowProductionAlertStream : Event{timestamp=1513049050858, data=[Gingerbread, 6664.0], isExpired=false}
INFO {io.siddhi.core.stream.output.sink.LogSink} - ReceiveTCPinJSONFormat : LowProductionAlertStream : Event{timestamp=1513049051858, data=[Cream Sandwich, 6190.0], isExpired=false}
INFO {io.siddhi.core.stream.output.sink.LogSink} - ReceiveTCPinJSONFormat : LowProductionAlertStream : Event{timestamp=1513049052859, data=[Gingerbread, 9725.0], isExpired=false}
INFO {io.siddhi.core.stream.output.sink.LogSink} - ReceiveTCPinJSONFormat : LowProductionAlertStream : Event{timestamp=1513049053859, data=[Donut, 7777.0], isExpired=false}
INFO {io.siddhi.core.stream.output.sink.LogSink} - ReceiveTCPinJSONFormat : LowProductionAlertStream : Event{timestamp=1513049054860, data=[Honeycomb, 8818.0], isExpired=false}

@App:name("ReceiveTCPinJSONFormat")
@App:description('Receive events via TCP transport in JSON format with default mapping and view the output on the console.')

@Source(type = 'tcp',
        context='SweetProductionStream',
        @map(type='json'))
define stream SweetProductionStream (name string, amount double);

@sink(type='log')
define stream LowProductionAlertStream (name string, amount double);

-- passthrough data in the SweetProductionStream into LowProducitonAlertStream
@info(name='query1')
from SweetProductionStream
select *
insert into LowProductionAlertStream;