How to publish a basic message to RabbitMQ exchange using op-rabbit - scala

Question

I've been trying to get a very simple app working to publish messages to a RabbitMQ exchange using the Scala op-rabbit library to no avail.
I'm clearly doing something wrong, but the docs are very limited regarding message publishing.
I can get the actor to connect to RabbitMQ. However, upon publishing a message, it doesn't appear in Rabbit.
Here is the code I'm using to publish the message:
object RmqPublisher extends App {
val actorSystem = ActorSystem("my-actor")
private lazy val config: Config = ConfigFactory.load()
val rabbitControl: ActorRef =
actorSystem.actorOf(Props {
new RabbitControl(
ConnectionParams.fromConfig(config.getConfig("op-rabbit.rabbit"))
)
}
)
rabbitControl ! Message.exchange("Test", "amq.direct", "my_routing_key")
}
Here is my config:
op-rabbit {
topic-exchange-name = amq.direct
channel-dispatcher = "op-rabbit.default-channel-dispatcher"
default-channel-dispatcher {
# Dispatcher is the name of the event-based dispatcher
type = Dispatcher
# What kind of ExecutionService to use
executor = "fork-join-executor"
# Configuration for the fork join pool
fork-join-executor {
# Min number of threads to cap factor-based parallelism number to
parallelism-min = 2
# Parallelism (threads) ... ceil(available processors * factor)
parallelism-factor = 2.0
# Max number of threads to cap factor-based parallelism number to
parallelism-max = 4
}
# Throughput defines the maximum number of messages to be
# processed per actor before the thread jumps to the next actor.
# Set to 1 for as fair as possible.
throughput = 100
}
rabbit {
exchange-name ="amq.direct"
routing-keys = "my_routing_key"
virtual-host = "/"
hosts = ["localhost"]
username = "guest"
password = "guest"
port = 5672
ssl = false
connection-timeout = "5s"
max-tps = 1000
}
}
The logs suggest it is connected successfully as can be seen below:
[INFO] [08/04/2020 21:49:39.219] [my-actor-op-rabbit.default-channel-dispatcher-5] [akka://my-actor/user/$a/connection/$a] akka://my-actor/user/$a/connection/$a connected
[INFO] [08/04/2020 21:49:39.223] [my-actor-akka.actor.default-dispatcher-4] [akka://my-actor/user/$a/connection] akka://my-actor/user/$a/connection connected to amqp://guest#{localhost:5672}:5672//
[INFO] [08/04/2020 21:49:39.230] [my-actor-akka.actor.default-dispatcher-2] [akka://my-actor/user/$a/connection/confirmed-publisher-channel] akka://my-actor/user/$a/connection/confirmed-publisher-channel connected
Any ideas what I'm doing wrong?