Class: SLDB::ProcessRefresher

Inherits:
Object
  • Object
show all
Defined in:
lib/sldb.rb,
lib/sldb-0.2.0.rb

Overview

class Logger

Constant Summary collapse

SIGNALS =

–{{{

%w( SIGTERM SIGINT SIGKILL )

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path, refresh_rate = 8) ⇒ ProcessRefresher

Returns a new instance of ProcessRefresher.



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# File 'lib/sldb.rb', line 310

def initialize path, refresh_rate = 8
#--{{{
  @path = path
  File::stat path
  @refresh_rate = Float refresh_rate
  @pipe = IO::pipe
  if((@pid = Util::fork))
    @pipe.last.close
    @pipe = @pipe.first
    @thread = Thread::new{loop{@pipe.gets}}
    Process::detach @pid
  else
    begin
      SIGNALS.each{|sig| trap(sig){ exit! }}
      pid = Process::pid
      ppid = Process::ppid
      $0 = "#{ path }.refresher.#{ pid }"
      @pipe.first.close
      @pipe = @pipe.last
      loop do
        FileUtils::touch @path
        sleep @refresh_rate
        Process::kill 0, ppid
        @pipe.puts pid
      end
    rescue Exception => e
      exit!
    end
  end
#--}}}
end

Instance Attribute Details

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/sldb.rb', line 307

def path
  @path
end

#pid ⇒ Object (readonly)

Returns the value of attribute pid.



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# File 'lib/sldb.rb', line 308

def pid
  @pid
end

#refresh_rate ⇒ Object (readonly)

Returns the value of attribute refresh_rate.



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# File 'lib/sldb.rb', line 309

def refresh_rate
  @refresh_rate
end

Instance Method Details

#kill ⇒ Object

–}}}



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# File 'lib/sldb.rb', line 341

def kill
#--{{{
  #Thread::new(Thread::current, @thread, @pipe) do |c, t, p|
    dead = false
    begin
      t.kill rescue nil
      p.close rescue nil
      SIGNALS.each do |sig| 
        begin
          Process::kill sig, @pid
          sleep 0.01
          Process::kill sig, @pid
        rescue Errno::ESRCH => e
          dead = true
          break
        rescue => e
          break
        end
      end
    ensure
      unless dead
        n = 42
        begin
          n.times do |i|
            sleep 0.2
            Process::kill 0, @pid
            sleep 1
          end
        rescue Errno::ESRCH
          dead = true
        end
        current.raise "runaway refresher <#{ @pid }> must be killed!" unless dead
      end
    end
  #end
#--}}}
end