Channels

Channels define the routing key and the message transmitted across to the broker. The bindings part is protocol specific.
Each channel represent the routing key, lkab.iot.{sensorId}.temperature, used when binding a queue with the specified exchange. The parameters defined on the channel should describe the pattern a consumer could use to retrieve data. The x-example is a place where you can tell the consuming part how the routing key is composed. In this case the routing key contains the id of the sensor producing the temperatures. With this information the consumer can choose if it would like to recieve data from all sensors or just one specific sensor.

#.temperatures // listen for changes from all sensors
SENSOR-001.temperatures // listen for changes from one specific sensor

channels:
  'lkab.iot.{sensorId}.temperature':
    address: 'lkab.iot.{sensorId}.temperature'
    messages:
      onSensorTemperatureChange.message:
        correlationId:
          location: $message.header#/correlation_id
        name: Temperature
        payload:
          $ref: '#/components/schemas/temperature'
    parameters:
      sensorId:
        description: >-
          Id of the temperature sensor. Use # to get temperatures from all
          sensors
    bindings:
      amqp:
        is: routingKey
        exchange:
          name: lkab.iot.v1.temperature
          type: topic
          vhost: iot

Operations

Operations defines what kind of operation is used through the action parameter. send or receive. In this case the application send temerature updates and has a send operation defined. With a reference to a channel.

operations:
  onSensorTemperatureChange:
    action: send
    channel:
      $ref: '#/channels/lkab.iot.{sensorId}.temperature'
    description: Send a temperature change from a sensor
    messages:
      - $ref: >-
          #/channels/lkab.iot.{sensorId}.temperature/messages/onSensorTemperatureChange.message