Class: Bunny::Queue

Inherits:
Object
  • Object
show all
Defined in:
lib/bunny/queue.rb

Overview

Represents AMQP 0.9.1 queue.

See Also:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(channel, name = AMQ::Protocol::EMPTY_STRING, opts = {}) ⇒ Queue

Returns a new instance of Queue

Parameters:

  • channel (Bunny::Channel) —

    Channel this queue will use.

  • name (String) (defaults to: AMQ::Protocol::EMPTY_STRING) —

    Queue name. Pass an empty string to make RabbitMQ generate a unique one.

  • opts (Hash) (defaults to: {}) —

    Queue properties

Options Hash (opts):

  • :durable (Boolean) — default: false —

    Should this queue be durable?

  • :auto_delete (Boolean) — default: false —

    Should this queue be automatically deleted when the last consumer disconnects?

  • :exclusive (Boolean) — default: false —

    Should this queue be exclusive (only can be used by this connection, removed when the connection is closed)?

  • :arguments (Boolean) — default: {} —

    Additional optional arguments (typically used by RabbitMQ extensions and plugins)

See Also:



34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
 
# File 'lib/bunny/queue.rb', line 34

def initialize(channel, name = AMQ::Protocol::EMPTY_STRING, opts = {})
  # old Bunny versions pass a connection here. In that case,
  # we just use default channel from it. MK.
  @channel          = channel
  @name             = name
  @options          = self.class.add_default_options(name, opts)

  @durable          = @options[:durable]
  @exclusive        = @options[:exclusive]
  @server_named     = @name.empty?
  @auto_delete      = @options[:auto_delete]
  @arguments        = @options[:arguments]

  @bindings         = Array.new

  @default_consumer = nil

  declare! unless opts[:no_declare]

  @channel.register_queue(self)
end

Instance Attribute Details

#channel ⇒ Bunny::Channel (readonly)

Returns Channel this queue uses

Returns:



15
16
17
 
# File 'lib/bunny/queue.rb', line 15

def channel
  @channel
end

#name ⇒ String (readonly)

Returns Queue name

Returns:

  • (String) —

    Queue name



17
18
19
 
# File 'lib/bunny/queue.rb', line 17

def name
  @name
end

#options ⇒ Hash (readonly)

Returns Options this queue was created with

Returns:

  • (Hash) —

    Options this queue was created with



19
20
21
 
# File 'lib/bunny/queue.rb', line 19

def options
  @options
end

Instance Method Details

#arguments ⇒ Hash

Returns Additional optional arguments (typically used by RabbitMQ extensions and plugins)

Returns:

  • (Hash) —

    Additional optional arguments (typically used by RabbitMQ extensions and plugins)



86
87
88
 
# File 'lib/bunny/queue.rb', line 86

def arguments
  @arguments
end

#auto_delete? ⇒ Boolean

Returns true if this queue was declared as automatically deleted (deleted as soon as last consumer unbinds).

Returns:

  • (Boolean) —

    true if this queue was declared as automatically deleted (deleted as soon as last consumer unbinds).

See Also:



73
74
75
 
# File 'lib/bunny/queue.rb', line 73

def auto_delete?
  @auto_delete
end

#bind(exchange, opts = {}) ⇒ Object

Binds queue to an exchange

Parameters:

  • exchange (Bunny::Exchange, String) —

    Exchange to bind to

  • opts (Hash) (defaults to: {}) —

    Binding properties

Options Hash (opts):

  • :routing_key (String) —

    Routing key

  • :arguments (Hash) — default: {} —

    Additional optional binding arguments

See Also:



110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
 
# File 'lib/bunny/queue.rb', line 110

def bind(exchange, opts = {})
  @channel.queue_bind(@name, exchange, opts)

  exchange_name = if exchange.respond_to?(:name)
                    exchange.name
                  else
                    exchange
                  end


  # store bindings for automatic recovery. We need to be very careful to
  # not cause an infinite rebinding loop here when we recover. MK.
  binding = { :exchange => exchange_name, :routing_key => (opts[:routing_key] || opts[:key]), :arguments => opts[:arguments] }
  @bindings.push(binding) unless @bindings.include?(binding)

  self
end

#consumer_count ⇒ Integer

Returns How many active consumers the queue has

Returns:

  • (Integer) —

    How many active consumers the queue has



323
324
325
326
 
# File 'lib/bunny/queue.rb', line 323

def consumer_count
  s = self.status
  s[:consumer_count]
end

#delete(opts = {}) ⇒ Object

Deletes the queue

Parameters:

  • opts (Hash) (defaults to: {}) —

    Options

Options Hash (opts):

  • if_unused (Boolean) — default: false —

    Should this queue be deleted only if it has no consumers?

  • if_empty (Boolean) — default: false —

    Should this queue be deleted only if it has no messages?

See Also:



293
294
295
296
 
# File 'lib/bunny/queue.rb', line 293

def delete(opts = {})
  @channel.deregister_queue(self)
  @channel.queue_delete(@name, opts)
end

#durable? ⇒ Boolean

Returns true if this queue was declared as durable (will survive broker restart).

Returns:

  • (Boolean) —

    true if this queue was declared as durable (will survive broker restart).

See Also:



59
60
61
 
# File 'lib/bunny/queue.rb', line 59

def durable?
  @durable
end

#exclusive? ⇒ Boolean

Returns true if this queue was declared as exclusive (limited to just one consumer)

Returns:

  • (Boolean) —

    true if this queue was declared as exclusive (limited to just one consumer)

See Also:



66
67
68
 
# File 'lib/bunny/queue.rb', line 66

def exclusive?
  @exclusive
end

#inspect ⇒ Object 



95
96
97
 
# File 'lib/bunny/queue.rb', line 95

def inspect
  to_s
end

#message_count ⇒ Integer

Returns How many messages the queue has ready (e.g. not delivered but not unacknowledged)

Returns:

  • (Integer) —

    How many messages the queue has ready (e.g. not delivered but not unacknowledged)



317
318
319
320
 
# File 'lib/bunny/queue.rb', line 317

def message_count
  s = self.status
  s[:message_count]
end

#pop(opts = {:manual_ack => false}, &block) ⇒ Array Also known as: get

Returns Triple of delivery info, message properties and message content. If the queue is empty, all three will be nils.

Examples:

conn = Bunny.new
conn.start

ch   = conn.create_channel
q = ch.queue("test1")
x = ch.default_exchange
x.publish("Hello, everybody!", :routing_key => 'test1')

delivery_info, properties, payload = q.pop

puts "This is the message: " + payload + "\n\n"
conn.close

Parameters:

  • opts (Hash) (defaults to: {:manual_ack => false}) —

    Options

Options Hash (opts):

  • :ack (Boolean) — default: false —

    [DEPRECATED] Use :manual_ack instead

  • :manual_ack (Boolean) — default: false —

    Will the message be acknowledged manually?

Returns:

  • (Array) —

    Triple of delivery info, message properties and message content. If the queue is empty, all three will be nils.

See Also:



242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
 
# File 'lib/bunny/queue.rb', line 242

def pop(opts = {:manual_ack => false}, &block)
  unless opts[:ack].nil?
    warn "[DEPRECATION] `:ack` is deprecated.  Please use `:manual_ack` instead."
    opts[:manual_ack] = opts[:ack]
  end

  get_response, properties, content = @channel.basic_get(@name, opts)

  if block
    if properties
      di = GetResponse.new(get_response, @channel)
      mp = MessageProperties.new(properties)

      block.call(di, mp, content)
    else
      block.call(nil, nil, nil)
    end
  else
    if properties
      di = GetResponse.new(get_response, @channel)
      mp = MessageProperties.new(properties)
      [di, mp, content]
    else
      [nil, nil, nil]
    end
  end
end

#publish(payload, opts = {}) ⇒ Object

Publishes a message to the queue via default exchange. Takes the same arguments as Exchange#publish

See Also:



277
278
279
280
281
 
# File 'lib/bunny/queue.rb', line 277

def publish(payload, opts = {})
  @channel.default_exchange.publish(payload, opts.merge(:routing_key => @name))

  self
end

#purge(opts = {}) ⇒ Object

Purges a queue (removes all messages from it)

See Also:



301
302
303
304
305
 
# File 'lib/bunny/queue.rb', line 301

def purge(opts = {})
  @channel.queue_purge(@name, opts)

  self
end

#server_named? ⇒ Boolean

Returns true if this queue was declared as server named.

Returns:

  • (Boolean) —

    true if this queue was declared as server named.

See Also:



80
81
82
 
# File 'lib/bunny/queue.rb', line 80

def server_named?
  @server_named
end

#status ⇒ Hash

Returns A hash with information about the number of queue messages and consumers

Returns:

  • (Hash) —

    A hash with information about the number of queue messages and consumers

See Also:



310
311
312
313
314
 
# File 'lib/bunny/queue.rb', line 310

def status
  queue_declare_ok = @channel.queue_declare(@name, @options.merge(:passive => true))
  {:message_count => queue_declare_ok.message_count,
    :consumer_count => queue_declare_ok.consumer_count}
end

#subscribe(opts = { :consumer_tag => @channel.generate_consumer_tag, :manual_ack => false, :exclusive => false, :block => false, :on_cancellation => nil }, &block) ⇒ Object

Adds a consumer to the queue (subscribes for message deliveries).

Parameters:

  • opts (Hash) (defaults to: { :consumer_tag => @channel.generate_consumer_tag, :manual_ack => false, :exclusive => false, :block => false, :on_cancellation => nil }) —

    Options

Options Hash (opts):

  • :ack (Boolean) — default: false —

    [DEPRECATED] Use :manual_ack instead

  • :manual_ack (Boolean) — default: false —

    Will this consumer use manual acknowledgements?

  • :exclusive (Boolean) — default: false —

    Should this consumer be exclusive for this queue?

  • :block (Boolean) — default: false —

    Should the call block calling thread?

  • :on_cancellation (#call) —

    Block to execute when this consumer is cancelled remotely (e.g. via the RabbitMQ Management plugin)

  • :consumer_tag (String) —

    Unique consumer identifier. It is usually recommended to let Bunny generate it for you.

  • :arguments (Hash) — default: {} —

    Additional (optional) arguments, typically used by RabbitMQ extensions

See Also:



168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
 
# File 'lib/bunny/queue.rb', line 168

def subscribe(opts = {
                :consumer_tag    => @channel.generate_consumer_tag,
                :manual_ack      => false,
                :exclusive       => false,
                :block           => false,
                :on_cancellation => nil
              }, &block)

  unless opts[:ack].nil?
    warn "[DEPRECATION] `:ack` is deprecated.  Please use `:manual_ack` instead."
    opts[:manual_ack] = opts[:ack]
  end

  ctag       = opts.fetch(:consumer_tag, @channel.generate_consumer_tag)
  consumer   = Consumer.new(@channel,
                            self,
                            ctag,
                            !opts[:manual_ack],
                            opts[:exclusive],
                            opts[:arguments])

  consumer.on_delivery(&block)
  consumer.on_cancellation(&opts[:on_cancellation]) if opts[:on_cancellation]

  @channel.basic_consume_with(consumer)
  if opts[:block]
    # joins current thread with the consumers pool, will block
    # the current thread for as long as the consumer pool is active
    @channel.work_pool.join
  end

  consumer
end

#subscribe_with(consumer, opts = {:block => false}) ⇒ Object

Adds a consumer object to the queue (subscribes for message deliveries).

Parameters:

  • consumer (Bunny::Consumer) —

    a Consumer subclass that implements consumer interface

  • opts (Hash) (defaults to: {:block => false}) —

    Options

Options Hash (opts):

  • block (Boolean) — default: false —

    Should the call block calling thread?

See Also:



211
212
213
214
215
216
 
# File 'lib/bunny/queue.rb', line 211

def subscribe_with(consumer, opts = {:block => false})
  @channel.basic_consume_with(consumer)

  @channel.work_pool.join if opts[:block]
  consumer
end

#to_s ⇒ Object 



90
91
92
93
 
# File 'lib/bunny/queue.rb', line 90

def to_s
  oid = ("0x%x" % (self.object_id << 1))
  "<#{self.class.name}:#{oid} @name=\"#{name}\" channel=#{@channel.to_s} @durable=#{@durable} @auto_delete=#{@auto_delete} @exclusive=#{@exclusive} @arguments=#{@arguments}>"
end

#unbind(exchange, opts = {}) ⇒ Object

Unbinds queue from an exchange

Parameters:

  • exchange (Bunny::Exchange, String) —

    Exchange to unbind from

  • opts (Hash) (defaults to: {}) —

    Binding properties

Options Hash (opts):

  • :routing_key (String) —

    Routing key

  • :arguments (Hash) — default: {} —

    Additional optional binding arguments

See Also:



139
140
141
142
143
144
145
146
147
148
149
150
151
152
 
# File 'lib/bunny/queue.rb', line 139

def unbind(exchange, opts = {})
  @channel.queue_unbind(@name, exchange, opts)

  exchange_name = if exchange.respond_to?(:name)
                    exchange.name
                  else
                    exchange
                  end


  @bindings.delete_if { |b| b[:exchange] == exchange_name && b[:routing_key] == (opts[:routing_key] || opts[:key]) && b[:arguments] == opts[:arguments] }

  self
end