Class: Shell::SystemCommand

Inherits:
Filter
  • Object
show all
Defined in:
lib/shell/system-command.rb

Instance Attribute Summary collapse

Attributes inherited from Filter

#input

Instance Method Summary collapse

Methods inherited from Filter

#+, #<, #>, #>>, #inspect, #to_a, #to_s, #|

Constructor Details

#initialize(sh, command, *opts) ⇒ SystemCommand

Returns a new instance of SystemCommand.



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# File 'lib/shell/system-command.rb', line 17

def initialize(sh, command, *opts)
  if t = opts.find{|opt| !opt.kind_of?(String) && opt.class}
	Shell.Fail Error::TypeError, t.class, "String"
  end
  super(sh)
  @command = command
  @opts = opts
  
  @input_queue = Queue.new
  @pid = nil

  sh.process_controller.add_schedule(self)
end

Instance Attribute Details

#command ⇒ Object (readonly) Also known as: name

Returns the value of attribute command.



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# File 'lib/shell/system-command.rb', line 31

def command
  @command
end

Instance Method Details

#active? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/shell/system-command.rb', line 38

def active?
  @shell.process_controller.active_job?(self)
end

#each(rs = nil) ⇒ Object 



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# File 'lib/shell/system-command.rb', line 144

def each(rs = nil)
  while (l = @input_queue.pop) != :EOF
	yield l
  end
end

#flush ⇒ Object 



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# File 'lib/shell/system-command.rb', line 60

def flush
  @pipe_out.flush if @pipe_out and !@pipe_out.closed?
end

#input=(inp) ⇒ Object 



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# File 'lib/shell/system-command.rb', line 42

def input=(inp)
  super
  if active?
	start_export
  end
end

#kill(sig) ⇒ Object 



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# File 'lib/shell/system-command.rb', line 75

def kill(sig)
  if @pid
	Process.kill(sig, @pid)
  end
end

#notify(*opts, &block) ⇒ Object

ex)

  if you wish to output: 
   "shell: job(#{@command}:#{@pid}) close pipe-out."
then 
   mes: "job(%id) close pipe-out."
  yorn: Boolean(@shell.debug? or @shell.verbose?)



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# File 'lib/shell/system-command.rb', line 156

def notify(*opts, &block)
  Thread.exclusive do
	@shell.notify(*opts) {|mes|
	  yield mes if iterator?

	  mes.gsub!("%id", "#{@command}:##{@pid}")
	  mes.gsub!("%name", "#{@command}")
	  mes.gsub!("%pid", "#{@pid}")
	}
  end
end

#start ⇒ Object 



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# File 'lib/shell/system-command.rb', line 49

def start
  @pid, @pipe_in, @pipe_out = @shell.process_controller.sfork(self) {
	Dir.chdir @shell.pwd
	exec(@command, *@opts)
  }
  if @input
	start_export
  end
  start_import
end

#start_export ⇒ Object 



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# File 'lib/shell/system-command.rb', line 116

def start_export
  notify "job(%id) start exp-pipe.", @shell.debug?
  _eop = true
  th = Thread.start{
	Thread.critical = true
	begin
	  Thread.critical = false
	  @input.each{|l| @pipe_out.print l}
	  _eop = false
	rescue Errno::EPIPE
	  _eop = false
	ensure
	  if _eop
 notify("shell: warn: Process finishing...",
 "wait for Job(%id) to finish pipe exporting.",
 "You can use Shell#transact or Shell#check_point for more safe execution.")
#	    Tracer.on
 redo
	  end
	  Thread.exclusive do
 notify "job(%id) close exp-pipe.", @shell.debug?
 @pipe_out.close
	  end
	end
  }
end

#start_import ⇒ Object 



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# File 'lib/shell/system-command.rb', line 82

def start_import
#      Thread.critical = true
  notify "Job(%id) start imp-pipe.", @shell.debug?
  rs = @shell.record_separator unless rs
  _eop = true
#      Thread.critical = false
  th = Thread.start {
	Thread.critical = true
	begin
	  Thread.critical = false
	  while l = @pipe_in.gets
 @input_queue.push l
	  end
	  _eop = false
	rescue Errno::EPIPE
	  _eop = false
	ensure
	  if _eop
 notify("warn: Process finishing...",
 "wait for Job[%id] to finish pipe importing.",
 "You can use Shell#transact or Shell#check_point for more safe execution.")
#	    Tracer.on
 Thread.current.run
 redo
	  end
	  Thread.exclusive do
 notify "job(%id}) close imp-pipe.", @shell.debug?
 @input_queue.push :EOF
 @pipe_in.close
	  end
	end
  }
end

#super_each ⇒ Object 



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# File 'lib/shell/system-command.rb', line 143

alias super_each each

#terminate ⇒ Object 



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# File 'lib/shell/system-command.rb', line 64

def terminate
  begin
	@pipe_in.close
  rescue IOError
  end
  begin
	@pipe_out.close
  rescue IOError
  end
end

#wait? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/shell/system-command.rb', line 34

def wait?
  @shell.process_controller.waiting_job?(self)
end