ruby – 我是否以正确的方式使用eventmachine？

我想知道我是否以正确的方式使用eventmachine.它有效,但感觉不对.

#!/usr/bin/env ruby

# Sample SMS gateway that can receive MOs (mobile originated messages) and
# DRs (delivery reports),and send MTs (mobile terminated messages).
# MTs are,in the name of simplicity,entered on the command line in the format
# <sender> <receiver> <message body>
# MOs and DRs will be dumped to standard out.

require 'smpp'
require 'redis/connection/hiredis'
require 'redis'
require 'yajl'
require 'time'

LOGFILE = File.dirname(__FILE__) + "/sms_gateway.log"
PIDFILE = File.dirname(__FILE__) + '/worker_test.pid'
Smpp::Base.logger = Logger.new(LOGFILE)
#Smpp::Base.logger.level = Logger::WARN

REDIS = Redis.new

class MbloxGateway

  # MT id counter. 
  @@mt_id = 0

  # expose SMPP transceiver's send_mt method
  def self.send_mt(sender,receiver,body)

    if sender =~ /[a-z]+/i
      source_addr_ton = 5
    else
      source_addr_ton = 2
    end

    @@mt_id += 1
    @@tx.send_mt(('smpp' + @@mt_id.to_s),sender,body,{
      :source_addr_ton => source_addr_ton
    #   :service_type => 1,#   :source_addr_ton => 5,#   :source_addr_npi => 0,#   :dest_addr_ton => 2,#   :dest_addr_npi => 1,#   :esm_class => 3,#   :protocol_id => 0,#   :priority_flag => 0,#   :schedule_delivery_time => nil,#   :validity_period => nil,#   :registered_delivery=> 1,#   :replace_if_present_flag => 0,#   :data_coding => 0,#   :sm_default_msg_id => 0 
    #     
    })
  end

  def logger
    Smpp::Base.logger
  end

  def start(config)
    # Write this workers pid to a file
    File.open(PIDFILE,'w') { |f| f << Process.pid }
    # The transceiver sends MT messages to the SMSC. It needs a storage with Hash-like
    # semantics to map SMSC message IDs to your own message IDs.
    pdr_storage = {} 

    # Run EventMachine in loop so we can reconnect when the SMSC drops our connection.
    loop do
      EventMachine::run do             
        @@tx = EventMachine::connect(
          config[:host],config[:port],Smpp::Transceiver,config,self    # delegate that will receive callbacks on MOs and DRs and other events
        )

      # Let the connection start before we check for messages
      EM.add_timer(3) do
        # Maybe there is some better way to do this. IDK,But it works!
        EM.defer do
          loop do
            # Pop a message
            message = REDIS.lpop 'messages:send:queue'
            if message # If there is a message. Process it and check the queue again
              message = Yajl::Parser.parse(message,:check_utf8 => false) # Parse the message from Json to Ruby hash
              if !message['send_after'] or (message['send_after'] and Time.parse(message['send_after']) < Time.now)

                self.class.send_mt(message['sender'],message['receiver'],message['body']) # Send the message
                REDIS.publish 'log:messages',"#{message['sender']} -> #{message['receiver']}: #{message['body']}" # Push the message to the redis queue so we can listen to the channel
              else
                REDIS.lpush 'messages:queue',Yajl::Encoder.encode(message)
              end
            else # If there is no message. Sleep for a second
              sleep 1
            end
          end
        end
      end
    end
      sleep 2
    end
  end

  # ruby-smpp delegate methods 

  def mo_received(transceiver,pdu)
    logger.info "Delegate: mo_received: from #{pdu.source_addr} to #{pdu.destination_addr}: #{pdu.short_message}"
  end

  def delivery_report_received(transceiver,pdu)
    logger.info "Delegate: delivery_report_received: ref #{pdu.msg_reference} stat #{pdu.stat}"
  end

  def message_accepted(transceiver,mt_message_id,pdu)
    logger.info "Delegate: message_accepted: id #{mt_message_id} smsc ref id: #{pdu.message_id}"
  end

  def message_rejected(transceiver,pdu)
    logger.info "Delegate: message_rejected: id #{mt_message_id} smsc ref id: #{pdu.message_id}"
  end

  def bound(transceiver)
    logger.info "Delegate: transceiver bound"
  end

  def unbound(transceiver)  
    logger.info "Delegate: transceiver unbound"
    EventMachine::stop_event_loop
  end

end

# Start the Gateway
begin   
  puts "Starting SMS Gateway. Please check the log at #{LOGFILE}"  

  # SMPP properties. These parameters work well with the Logica SMPP simulator.
  # Consult the SMPP spec or your mobile operator for the correct settings of 
  # the other properties.
  config = {
    :host => 'server.com',:port => 3217,:system_id => 'user',:password => 'password',:system_type => 'type',# default given according to SMPP 3.4 Spec
    :interface_version => 52,:source_ton  => 0,:source_npi => 1,:destination_ton => 1,:destination_npi => 1,:source_address_range => '',:destination_address_range => '',:enquire_link_delay_secs => 10
  }  
  gw = MbloxGateway.new
  gw.start(config)

rescue Exception => ex
  puts "Exception in SMS Gateway: #{ex} at #{ex.backtrace.join("n")}"
end