Class: Lipsiadmin::Loops::Worker

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

Overview

:nodoc:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, logger, engine, &blk) ⇒ Worker

Returns a new instance of Worker.



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# File 'lib/loops/worker.rb', line 8

def initialize(name, logger, engine, &blk)
  raise "Need a worker block!" unless block_given?

  @name = name
  @logger = logger
  @engine = engine    
  @worker_block = blk

  @shutdown = false
end

Instance Attribute Details

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/loops/worker.rb', line 4

def logger
  @logger
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/loops/worker.rb', line 5

def name
  @name
end

#pid ⇒ Object (readonly)

Returns the value of attribute pid.



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# File 'lib/loops/worker.rb', line 6

def pid
  @pid
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/loops/worker.rb', line 23

def run
  return if shutdown?
  if @engine == 'fork'
    @pid = Kernel.fork do
      $0 = "loop worker: #{@name}\0"
      @pid = Process.pid
      @worker_block.call
      exit(0)
    end
  elsif @engine == 'thread'
    @thread = Thread.start do
      @worker_block.call
    end
  else
    raise "Invalid engine name: #{@engine}"
  end
rescue Exception => e
  logger.error("Exception from worker: #{e} at #{e.backtrace.first}")
end

#running?(verbose = false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/loops/worker.rb', line 43

def running?(verbose = false)
  return false if shutdown?
  if @engine == 'fork'
    return false unless @pid
    begin
      Process.waitpid(@pid, Process::WNOHANG)
      res = Process.kill(0, @pid)
      logger.debug("KILL(#{@pid}) = #{res}") if verbose
      return true
    rescue Errno::ESRCH, Errno::ECHILD, Errno::EPERM => e
      logger.error("Exception from kill: #{e} at #{e.backtrace.first}") if verbose
      return false
    end
  elsif @engine == 'thread'
    @thread && @thread.alive?
  else
    raise "Invalid engine name: #{@engine}"
  end
end

#shutdown? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/loops/worker.rb', line 19

def shutdown?
  @shutdown
end

#stop(force = false) ⇒ Object 



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# File 'lib/loops/worker.rb', line 63

def stop(force = false)
  @shutdown = true
  if @engine == 'fork'
    begin
      sig = force ? 'SIGKILL' : 'SIGTERM'
      logger.debug("Sending #{sig} to ##{@pid}")
      Process.kill(sig, @pid)
    rescue Errno::ESRCH, Errno::ECHILD, Errno::EPERM=> e
      logger.error("Exception from kill: #{e} at #{e.backtrace.first}")
    end
  elsif @engine == 'thread'
    force && !defined?(::JRuby) ? @thread.kill! : @thread.kill
  else
    raise "Invalid engine name: #{@engine}"
  end
end