Class: JobQueue

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

Overview

Direct Known Subclasses

SystemJobs

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(nWorkers = JobQueue.maxnumber_of_processors, debug = :off) ⇒ JobQueue

Create a new queue qith a given number of worker threads



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# File 'lib/jobqueue.rb', line 14

def initialize(nWorkers=JobQueue.maxnumber_of_processors,debug=:off)
  @workers = nWorkers
  @queue   = Queue.new
  @debug   = debug
end

Instance Attribute Details

#threads ⇒ Object (readonly)

Returns the value of attribute threads.



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# File 'lib/jobqueue.rb', line 11

def threads
  @threads
end

#workers ⇒ Object (readonly)

Returns the value of attribute workers.



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# File 'lib/jobqueue.rb', line 11

def workers
  @workers
end

Class Method Details

.maxnumber_of_processors ⇒ Object

Get the maximum number of parallel runs



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# File 'lib/jobqueue.rb', line 58

def JobQueue.maxnumber_of_processors
  case RUBY_ENGINE
  when 'jruby'
    require 'java'
    return java.lang.Runtime.getRuntime.availableProcessors
  when 'ironruby'
    return System::Environment.ProcessorCount
  when 'ruby','rbx'
    case  RUBY_PLATFORM
    when /linux/
      return `cat /proc/cpuinfo | grep processor | wc -l`.to_i
    when /darwin/
      return `sysctl -n hw.logicalcpu`.to_i
    when /(win32|mingw|cygwin)/
      # this works for windows 2000 or greater
      require 'win32ole'
      wmi = WIN32OLE.connect("winmgmts://")
      wmi.ExecQuery("select * from Win32_ComputerSystem").each do |system|
        begin
          processors = system.NumberOfLogicalProcessors
        rescue
          processors = 0
        end
        return [system.NumberOfProcessors, processors].max
      end
    when /powerpc-aix/
      return IO.popen("lsdev -Cc processor").readlines.size
      # alternative, but slover: IO.popen("prtconf").readlines.grep(/Number of processors/i).first.split(" ").last.to_i
    end
  end
  raise "Cannot determine the number of available Processors for RUBY_PLATFORM:'#{RUBY_PLATFORM}' and RUBY_ENGINE:#{RUBY_ENGINE}"
end

Instance Method Details

#push(*item, &block) ⇒ Object

Put jobs into the queue. Use

proc,args for single methods
object,:method,args for sende messages to objects



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# File 'lib/jobqueue.rb', line 28

def push(*item,&block)
  @queue << item    unless item.empty?
  @queue << [block] unless block.nil?
end

#run ⇒ Object

Start workers to run through the queue



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# File 'lib/jobqueue.rb', line 34

def run
  @threads = (1..@workers).map {|i|
    Thread.new(@queue) {|q|
      until ( q == ( task = q.deq ) )
        if task.size > 1
          if task[0].kind_of? Proc
            # Expects proc/lambda with arguments, e.g. [mysqrt,2.789]
            task[0].call(*task[1..-1])
          else
            # expect an object in task[0] and one of its methods with arguments in task[1] as a symbol
            # e.g. [a,[:attribute=,1]
            task[0].send(task[1],*task[2..-1])
          end
        else
          task[0].call
        end
      end
    }
  }
  @threads.size.times { @queue.enq @queue}
  @threads.each {|t| t.join}
end