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Rabbus Demos

Rabbus includes demos of the three core patterns that it provides:

  • Send / Receive
  • Publish / Subscribe
  • Request / Response

Each of these demos is found in the /demos folder of the repository.

RabbitMQ Connection

The core RabbitMQ connection for all demos is handled from the demos/connection.js file.

However, this file defers to the connection configuration found in rabbus/specs/config/index.json.

To change the connection information used by the demos, you can change either of the above files.

Executing The Demos

Note: Change directory into the folder for the demo you wish to run.

Send/Receive

Located in the demos/send-receive folder.

Demonstrate the send/receive pattern, to send a single message to a single receiver.

Open a console window and run:

  • node send.js

If you examine your RabbitMQ queues, you'll see a message sitting in a queue, waiting to be processed.

Now run the receiver:

  • node receive.js

You will see the message that was sent.

Pub/Sub

Located in the demos/pub-sub folder.

Demonstrate the publish/subscribe pattern, with multiple subscribers receiving one published message.

Open at least two console windows for subscribers, and run the following in each window:

  • node subscriber.js

Now that you have multiple subscribers, open one additional console window and run the following to publish a message:

  • node publish.js

Note that each subscriber received a copy of the message.

To see the net effect of the pub/sub pattern, do this:

  1. Stop one of the subscribers
  2. Publish another message
  3. Note the still-running subscriber(s) received the message
  4. Re-start the stopped subscriber
  5. Note the re-started subscriber does not receive the message

Only subscribers that are active when the message is published, will receive the message. This is intentional - it is the pub/sub pattern.

Request/Response

Located in the demos/request-response folder.

Demonstrate the request/response pattern with a request being made for a location, and a response being sent with the location information.

Open a console window and run:

  • node response.js

This will set up the responder - the code that recieves the original message and sends back a response.

Now open a second console window and run this:

  • node request.js

Here, you will send a message. The response.js process will receive it and send a response back. You should see the response printed to the console of the request.js process.