def receive_messages(options = {})
      batch = []
      options = options.merge(queue_url: @url)
      resp = @client.receive_message(options)
      resp.data.messages.each do |m|
        batch << Message.new(
          queue_url: @url,
          receipt_handle: m.receipt_handle,
          data: m,
          client: @client
        )
      end
      Message::Collection.new([batch], size: batch.size)
    end
def receive_messages(options = {})
      batch = []
      options = options.merge(queue_url: @url)
      resp = @client.receive_message(options)
      resp.data.messages.each do |m|
        batch << Message.new(
          queue_url: @url,
          receipt_handle: m.receipt_handle,
          data: m,
          client: @client
        )
      end
      Message::Collection.new([batch], size: batch.size)
    end
@example Request syntax with placeholder values

   message = queue.receive_messages({
     attribute_names: ["All"], # accepts All, Policy, VisibilityTimeout, MaximumMessageSize, MessageRetentionPeriod, ApproximateNumberOfMessages, ApproximateNumberOfMessagesNotVisible, CreatedTimestamp, LastModifiedTimestamp, QueueArn, ApproximateNumberOfMessagesDelayed, DelaySeconds, ReceiveMessageWaitTimeSeconds, RedrivePolicy, FifoQueue, ContentBasedDeduplication, KmsMasterKeyId, KmsDataKeyReusePeriodSeconds
     message_attribute_names: ["MessageAttributeName"],
     max_number_of_messages: 1,
     visibility_timeout: 1,
     wait_time_seconds: 1,
     receive_request_attempt_id: "String",
   })
 @param [Hash] options ({})
 @option options [Array<String>] :attribute_names
   A list of s that need to be returned along with each message. These
   attributes include:

   * `All` - Returns all values.

   * `ApproximateFirstReceiveTimestamp` - Returns the time the message
     was first received from the queue ([epoch time][1] in milliseconds).

   * `ApproximateReceiveCount` - Returns the number of times a message
     has been received from the queue but not deleted.

   * `SenderId`

     * For an IAM user, returns the IAM user ID, for example
       `ABCDEFGHI1JKLMNOPQ23R`.

     * For an IAM role, returns the IAM role ID, for example
       `ABCDE1F2GH3I4JK5LMNOP:i-a123b456`.

   * `SentTimestamp` - Returns the time the message was sent to the queue
     ([epoch time][1] in milliseconds).

   * `MessageDeduplicationId` - Returns the value provided by the
     producer that calls the ` SendMessage ` action.

   * `MessageGroupId` - Returns the value provided by the producer that
     calls the ` SendMessage ` action. Messages with the same
     `MessageGroupId` are returned in sequence.

   * `SequenceNumber` - Returns the value provided by Amazon SQS.



   [1]: http://en.wikipedia.org/wiki/Unix_time
 @option options [Array<String>] :message_attribute_names
   The name of the message attribute, where *N* is the index.

   * The name can contain alphanumeric characters and the underscore
     (`_`), hyphen (`-`), and period (`.`).

   * The name is case-sensitive and must be unique among all attribute
     names for the message.

   * The name must not start with AWS-reserved prefixes such as `AWS.` or
     `Amazon.` (or any casing variants).

   * The name must not start or end with a period (`.`), and it should
     not have periods in succession (`..`).

   * The name can be up to 256 characters long.

   When using `ReceiveMessage`, you can send a list of attribute names to
   receive, or you can return all of the attributes by specifying `All`
   or `.*` in your request. You can also use all message attributes
   starting with a prefix, for example `bar.*`.
 @option options [Integer] :max_number_of_messages
   The maximum number of messages to return. Amazon SQS never returns
   more messages than this value (however, fewer messages might be
   returned). Valid values: 1 to 10. Default: 1.
 @option options [Integer] :visibility_timeout
   The duration (in seconds) that the received messages are hidden from
   subsequent retrieve requests after being retrieved by a
   `ReceiveMessage` request.
 @option options [Integer] :wait_time_seconds
   The duration (in seconds) for which the call waits for a message to
   arrive in the queue before returning. If a message is available, the
   call returns sooner than `WaitTimeSeconds`. If no messages are
   available and the wait time expires, the call returns successfully
   with an empty list of messages.
 @option options [String] :receive_request_attempt_id
   This parameter applies only to FIFO (first-in-first-out) queues.

   The token used for deduplication of `ReceiveMessage` calls. If a
   networking issue occurs after a `ReceiveMessage` action, and instead
   of a response you receive a generic error, you can retry the same
   action with an identical `ReceiveRequestAttemptId` to retrieve the
   same set of messages, even if their visibility timeout has not yet
   expired.

   * You can use `ReceiveRequestAttemptId` only for 5 minutes after a
     `ReceiveMessage` action.

   * When you set `FifoQueue`, a caller of the `ReceiveMessage` action
     can provide a `ReceiveRequestAttemptId` explicitly.

   * If a caller of the `ReceiveMessage` action doesn't provide a
     `ReceiveRequestAttemptId`, Amazon SQS generates a
     `ReceiveRequestAttemptId`.

   * You can retry the `ReceiveMessage` action with the same
     `ReceiveRequestAttemptId` if none of the messages have been modified
     (deleted or had their visibility changes).

   * During a visibility timeout, subsequent calls with the same
     `ReceiveRequestAttemptId` return the same messages and receipt
     handles. If a retry occurs within the deduplication interval, it
     resets the visibility timeout. For more information, see [Visibility
     Timeout][1] in the *Amazon Simple Queue Service Developer Guide*.

     If a caller of the `ReceiveMessage` action still processes messages
     when the visibility timeout expires and messages become visible,
     another worker consuming from the same queue can receive the same
     messages and therefore process duplicates. Also, if a consumer whose
     message processing time is longer than the visibility timeout tries
     to delete the processed messages, the action fails with an error.

      To mitigate this effect, ensure that your application observes a
     safe threshold before the visibility timeout expires and extend the
     visibility timeout as necessary.

   * While messages with a particular `MessageGroupId` are invisible, no
     more messages belonging to the same `MessageGroupId` are returned
     until the visibility timeout expires. You can still receive messages
     with another `MessageGroupId` as long as it is also visible.

   * If a caller of `ReceiveMessage` can't track the
     `ReceiveRequestAttemptId`, no retries work until the original
     visibility timeout expires. As a result, delays might occur but the
     messages in the queue remain in a strict order.

   The length of `ReceiveRequestAttemptId` is 128 characters.
   `ReceiveRequestAttemptId` can contain alphanumeric characters (`a-z`,
   `A-Z`, `0-9`) and punctuation (`` !"#$%&'()*+,-./:;<=>?@[\]^_`\{|\}~
   ``).

   For best practices of using `ReceiveRequestAttemptId`, see [Using the
   ReceiveRequestAttemptId Request Parameter][2] in the *Amazon Simple
   Queue Service Developer Guide*.



   [1]: http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-visibility-timeout.html
   [2]: http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/using-receiverequestattemptid-request-parameter.html
 @return [Message::Collection]