Class: Msgr::Dispatcher

Inherits:
Object
  • Object
show all
Includes:
Logging
Defined in:
lib/msgr/dispatcher.rb

Overview

The Dispatcher receives incoming messages, process them through a middleware stack and delegate them to a new and fresh consumer instance.

Defined Under Namespace

Classes: NullPool

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Logging

#log, #log_name

Constructor Details

#initialize(config) ⇒ Dispatcher

Returns a new instance of Dispatcher.



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# File 'lib/msgr/dispatcher.rb', line 13

def initialize(config)
  config[:pool_class] ||= 'Msgr::Dispatcher::NullPool'

  log(:debug) do
    "Initialize new dispatcher (#{config[:pool_class]}: #{config})..."
  end

  @config = config
  @pool = config[:pool_class].constantize.new config
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/msgr/dispatcher.rb', line 11

def config
  @config
end

#pool ⇒ Object (readonly)

Returns the value of attribute pool.



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# File 'lib/msgr/dispatcher.rb', line 11

def pool
  @pool
end

Instance Method Details

#call(message) ⇒ Object 



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# File 'lib/msgr/dispatcher.rb', line 24

def call(message)
  pool.post(message) do |msg|
    dispatch msg
  end
end

#dispatch(message) ⇒ Object 



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# File 'lib/msgr/dispatcher.rb', line 30

def dispatch(message)
  consumer_class = Object.const_get message.route.consumer

  log(:debug) { "Dispatch message to #{consumer_class.name}" }

  consumer_class.new.dispatch message

  # Acknowledge message only if it is not already acknowledged and auto
  # acknowledgment is enabled.
  message.ack unless message.acked? || !consumer_class.auto_ack?
rescue StandardError => e
  message.nack unless message.acked?

  log(:error) do
    "Dispatcher error: #{e.class.name}: #{e}\n" +
      e.backtrace.join("\n")
  end

  raise e if config[:raise_exceptions]
ensure
  if defined?(ActiveRecord) &&
     ActiveRecord::Base.connection_pool.active_connection?
    log(:debug) { 'Release used AR connection for dispatcher thread.' }
    ActiveRecord::Base.connection_pool.release_connection
  end
end

#shutdown ⇒ Object 



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# File 'lib/msgr/dispatcher.rb', line 57

def shutdown; end

#to_s ⇒ Object 



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# File 'lib/msgr/dispatcher.rb', line 59

def to_s
  self.class.name
end