@spec bind(AMQP.Channel.t(), AMQP.Basic.queue(), AMQP.Basic.exchange(), keyword()) ::
  :ok | AMQP.Basic.error()

Binds a Queue to an Exchange.

Options

• :routing_key - The routing key used to bind the queue to the exchange (default "")

• :nowait - If true, the binding is not synchronous (default false)

• :arguments - A list of arguments to pass when binding (of type AMQP.arguments/0). See the README for more information (default [])

@spec consumer_count(AMQP.Channel.t(), AMQP.Basic.queue()) :: integer() | no_return()

Returns a number of active consumers on the queue.

@spec declare(AMQP.Channel.t(), AMQP.Basic.queue(), keyword()) ::
  {:ok,
   %{
     queue: AMQP.Basic.queue(),
     message_count: integer(),
     consumer_count: integer()
   }}
  | :ok
  | AMQP.Basic.error()

Declares a queue. The optional queue parameter is used to set the name. If set to an empty string (default), the server will assign a name.

Besides the queue name, the following options can be used:

Options

• :durable - If set, keeps the Queue between restarts of the broker (default false)

• :auto_delete - If set, deletes the Queue once all subscribers disconnect (default to false)

• :exclusive - If set, only one subscriber can consume from the Queue (default false)

• :passive - If set, raises an error unless the queue already exists (default false)

• :nowait - If set, the declare operation is asynchronous (default false)

• :arguments - A list of arguments to pass when declaring (of type AMQP.arguments/0). See the README for more information (default [])

@spec delete(AMQP.Channel.t(), AMQP.Basic.queue(), keyword()) ::
  {:ok, map()} | :ok | AMQP.Basic.error()

Deletes a Queue by name.

Options

• :if_unused - If set, the server will only delete the queue if it has no consumers. If the queue has consumers, it's not deleted and an error is returned

• :if_empty - If set, the server will only delete the queue if it has no messages

• :nowait - If set, the delete operation is asynchronous

@spec empty?(AMQP.Channel.t(), AMQP.Basic.queue()) :: boolean() | no_return()

Returns true if queue is empty (has no messages ready), false otherwise.

@spec message_count(AMQP.Channel.t(), AMQP.Basic.queue()) :: integer() | no_return()

Returns the number of messages that are ready for delivery (e.g. not pending acknowledgements) in the queue.

@spec purge(AMQP.Channel.t(), AMQP.Basic.queue()) :: {:ok, map()} | AMQP.Basic.error()

Discards all messages in the Queue.

@spec status(AMQP.Channel.t(), AMQP.Basic.queue()) ::
  {:ok, map()} | AMQP.Basic.error()

Returns the message count and consumer count for the given queue. Uses declare/3 with the :passive option set.

@spec subscribe(
  AMQP.Channel.t(),
  AMQP.Basic.queue(),
  (String.t(), map() -> any()),
  keyword()
) ::
  {:ok, String.t()} | AMQP.Basic.error()

Convenience to consume messages from a Queue.

The handler function must have arity 2 and will receive as arguments a binary with the message payload and a Map with the message properties.

The consumed message will be acknowledged after executing the handler function.

If an exception is raised by the handler function, the message is rejected.

This convenience function will spawn a process and register it using AMQP.Basic.consume/4.

@spec unbind(AMQP.Channel.t(), AMQP.Basic.queue(), AMQP.Basic.exchange(), keyword()) ::
  :ok | AMQP.Basic.error()

Unbinds a Queue from an Exchange.

Options

• :routing_key - The routing queue for removing the binding (default "")

• :arguments - A list of arguments to pass when unbinding (of type AMQP.arguments/0). See the README for more information (defaults [])

@spec unsubscribe(AMQP.Channel.t(), AMQP.Basic.consumer_tag()) ::
  {:ok, String.t()} | AMQP.Basic.error()

Stops the consumer identified by consumer_tag from consuming.

Internally just calls AMQP.Basic.cancel/2.