Class: MultiRedisMQHelper

Inherits:
Object
  • Object
show all
Defined in:
lib/helpers/multi_redis_mq_helper.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, host_ip, port, input_channels, output_channel) ⇒ MultiRedisMQHelper

Returns a new instance of MultiRedisMQHelper.



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# File 'lib/helpers/multi_redis_mq_helper.rb', line 8

def initialize(name, host_ip, port, input_channels, output_channel)
  @name = name
  @instance = Redis.new(host: host_ip, port: port)
  puts "#{@instance.keys('*')}"
  @ip = host_ip
  @port = port

  @input_channels = input_channels
  @input_locks = @input_channels.map { |input_channel| "#{input_channel}_lock" }
  @input_overall_lock = "#{@input_channels.sort.map{ |channel| channel}.join('_')}_lock"

  @output_channel = output_channel

  @input_locks.each { |input_lock| @instance.setnx(input_lock, 0) }
  @instance.setnx(@input_overall_lock, 0)
end

Instance Attribute Details

#input_channel ⇒ Object (readonly)

Returns the value of attribute input_channel.



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# File 'lib/helpers/multi_redis_mq_helper.rb', line 6

def input_channel
  @input_channel
end

#ip ⇒ Object (readonly)

Returns the value of attribute ip.



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# File 'lib/helpers/multi_redis_mq_helper.rb', line 6

def ip
  @ip
end

#output_channel ⇒ Object (readonly)

Returns the value of attribute output_channel.



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# File 'lib/helpers/multi_redis_mq_helper.rb', line 6

def output_channel
  @output_channel
end

#port ⇒ Object (readonly)

Returns the value of attribute port.



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# File 'lib/helpers/multi_redis_mq_helper.rb', line 6

def port
  @port
end

Instance Method Details

#pop_input! ⇒ Object

wait until get input



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# File 'lib/helpers/multi_redis_mq_helper.rb', line 31

def pop_input!
  inputs = old_overall_lock = new_overall_lock = nil

  while true
    has_all_input = true
    @input_channels.each do |input_channel|
      has_all_input &&= (@instance.llen(input_channel) != 0)
      break if !has_all_input
    end

    if !has_all_input
      puts "#{@name} check empty, sleep"
      sleep(rand(5) + 5)
      next
    end

	puts "#{@name} check exists, go on"

    # this if means maybe get the overall lock
    if(old_overall_lock = @instance.get(@input_overall_lock).to_i == 0)
      new_overall_lock = @instance.incr(@input_overall_lock).to_i

      if new_overall_lock != 1
        puts "#{@name} check conflict, sleep"
        sleep(rand(10) * 0.1 + 1)
        next
      end

      puts "#{@name} get overall key!"
    

      get_key_channels = []
      @input_locks.each do |input_lock|
        this_key = @instance.incr(input_lock).to_i
        if this_key == 1 # get this key
          get_key_channels << input_lock
        end
      end

      # not getting all locks
      if get_key_channels.size < @input_locks.size

        # give back individual locks
        get_key_channels.each do |get_key_channel|
          @instance.set(get_key_channel, 0)
        end

        # give back overall lock
        @instance.set(@input_overall_lock, 0)
        puts "#{@name} check some inputs has conflict, sleep"
        sleep(rand(10) * 0.1 + 1)
        next
      end

      puts "#{@name} get all keys, pop inputs"
      inputs = @input_channels.map do |input_channel|
        @instance.rpop(input_channel)
      end

      @input_locks.each do |input_lock|
        @instance.set(input_lock, 0)
      end

      @instance.set(@input_overall_lock, 0)
      break
    end
  end

  return inputs
end

#push_output!(message) ⇒ Object

push directly without lock, message is string



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# File 'lib/helpers/multi_redis_mq_helper.rb', line 26

def push_output!(message)
  @instance.rpush(@output_channel, message) 
end