Class: HybridPlatformsConductor::IoRouter

Inherits:
Object
  • Object
show all
Defined in:
lib/hybrid_platforms_conductor/io_router.rb

Overview

Simple router of IO and queue streams from som inputs to outputs, asynchronous

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(routes) ⇒ IoRouter

Constructor

Parameters

  • routes (Hash<IO or Queue, Array<IO> >): List of destination IOs that should receive content per source IO.



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# File 'lib/hybrid_platforms_conductor/io_router.rb', line 25

def initialize(routes)
  @routes = routes
  @reading_thread = nil
end

Class Method Details

.with_io_router(routes) ⇒ Object

Create an IO router and make sure it is freed when client code has finished

Parameters

  • routes (Hash<IO or Queue, Array<IO> >): List of destination IOs that should receive content per source IO.

  • Proc: Client code



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# File 'lib/hybrid_platforms_conductor/io_router.rb', line 11

def self.with_io_router(routes)
  io_router = IoRouter.new(routes)
  begin
    io_router.start
    yield
  ensure
    io_router.stop
  end
end

Instance Method Details

#start ⇒ Object

Start routing messages asynchronously



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# File 'lib/hybrid_platforms_conductor/io_router.rb', line 31

def start
  raise 'IO router is already started. Can\'t start it again.' unless @reading_thread.nil?
  @end_read = false
  # Create a thread to handle routes asynchronously
  @reading_thread = Thread.new do
    loop do
      need_to_stop = @end_read.clone
      data_found = false
      @routes.each do |src_io, dst_ios|
        if src_io.is_a?(Queue)
          queue_size = src_io.size
          if queue_size > 0
            # There is data to be read from src_io
            data_found = true
            data_chunk_str = queue_size.times.map { src_io.pop }.join
            dst_ios.each do |dst_io|
              dst_io << data_chunk_str
              dst_io.flush if dst_io.respond_to?(:flush)
            end
          end
        else
          raise "Unknown type of source IO: #{src_io}"
        end
      end
      break if need_to_stop && !data_found
      sleep 0.1
    end
  end
end

#stop ⇒ Object

Stop routing messages asynchronously



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# File 'lib/hybrid_platforms_conductor/io_router.rb', line 62

def stop
  raise 'IO router is not started. Can\'t stop it.' if @reading_thread.nil?
  @end_read = true
  @reading_thread.join
end