class MessageChannel::Druby

Attributes

host[R]
port[R]

Public Class Methods

new( host: nil, port: nil ) click to toggle source
# File lib/message_channel/druby.rb, line 111
def initialize( host: nil, port: nil )
  @host  =  host  || "127.0.0.1"
  @port  =  ( port  ||  8787 ).to_i
  @agent  =  Agent.new( host: @host, port: @port )
  @threads  =  {}
end

Public Instance Methods

listen( *patterns, timeout: nil, &block ) click to toggle source
# File lib/message_channel/druby.rb, line 159
def listen( *patterns, timeout: nil, &block )
  if block_given?
    listen_each( *patterns ) do |topic, items|
      block.call( topic, items )
    end
    return  nil
  end
  if timeout.nil? || ( timeout.is_a?( Numeric ) && timeout >= 0 )
    begin
      Timeout.timeout( timeout ) do
        listen_once( *patterns )
      end
    rescue  Timeout::Error
      return  nil
    end
  else
    raise  ArgumentError, "timeout: %s" % timeout
  end
end
listen_each( *patterns, &block ) click to toggle source
# File lib/message_channel/druby.rb, line 144
def listen_each( *patterns, &block )
  patterns.each do |pattern|
    @threads[pattern]  =  Thread.start( pattern ) do |pttrn|
      begin
        @agent.listen_each( pttrn ) do |topic, message|
          items  =  JSON.parse( message, symbolize_names: true )
          block.call( topic, items )
        end
      rescue => error
        nil
      end
    end
  end
end
listen_once( *patterns ) click to toggle source
# File lib/message_channel/druby.rb, line 118
def listen_once( *patterns )
  queue  =  Queue.new
  threads  =  {}
  patterns.each do |pattern|
    threads[pattern]  =  Thread.start( pattern ) do |pttrn|
      agent  =  Agent.new
      begin
        topic, message  =  * agent.listen_once( pttrn )
        items  =  JSON.parse( message, symbolize_names: true )
        queue.push( [topic, items] )
      rescue => error
        nil
      end
    end
  end

  topic, items  =  queue.pop
  patterns.each do |pattern|
    threads[pattern].kill    rescue  nil
    threads.delete( pattern )    rescue  nil
  end
  [topic, items]
rescue
  nil
end
notify( topic, **items ) click to toggle source
# File lib/message_channel/druby.rb, line 186
def notify( topic, **items )
  @agent.notify( topic, items.to_json )
end
unlisten( *patterns ) click to toggle source
# File lib/message_channel/druby.rb, line 179
def unlisten( *patterns )
  patterns.each do |pattern|
    @agent.unlisten( pattern )
    @threads.delete( pattern )
  end
end