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Programming language: Elixir
License: MIT License
Latest version: v0.0.1

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README

Phoenix Pubsub - RabbitMQ Adapter

RabbitMQ adapter for the Phoenix framework PubSub layer.

Usage

Add phoenix_pubsub_rabbitmq as a dependency in your mix.exs file.

def deps do
  [{:phoenix_pubsub_rabbitmq, "0.0.1"}]
end

You should also update your application list to include :phoenix_pubsub_rabbitmq:

def application do
  [applications: [:phoenix_pubsub_rabbitmq]]
end

Edit your Phoenix application Endpoint configuration:

  config :my_app, MyApp.Endpoint,
    ...
    pubsub: [name: MyApp.PubSub,
             adapter: Phoenix.PubSub.RabbitMQ,
             options: [host: "localhost"]

The following options are supported:

  * `host` - The hostname of the broker (defaults to \"localhost\");
  * `port` - The port the broker is listening on (defaults to `5672`);
  * `username` - The name of a user registered with the broker (defaults to \"guest\");
  * `password` - The password of user (defaults to \"guest\");
  * `virtual_host` - The name of a virtual host in the broker (defaults to \"/\");
  * `heartbeat` - The connection hearbeat interval in seconds (defaults to `0` - turned off);
  * `connection_timeout` - The connection timeout in milliseconds (defaults to `infinity`);
  * `pool_size` - Number of active connections to the broker

Notes

  • An Exchange is declared with the name of the Phoenix PubSub server (example: MyApp.PubSub)
  • When subscribing to a topic:
    • a Queue with a server assigned name is declared;
    • the Queue is bound to the Exchange using the topic as routing key;
    • a consumer process is started. The consumer will ack each message in the Queue as it sends the payload to the subscriber pid;
  • Can be used when distributed Erlang is not an option (like when deploying to Heroku); when RabbitMQ is already a dependency (instead of Redis);
  • Uses RabbitMQ routing mechanism, delivering a message directly to a consumer process