Class: Bj::Runner::Background

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

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(command) ⇒ Background

Returns a new instance of Background.



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# File 'lib/bj/runner.rb', line 10

def initialize command
  @command = command
  @thread = new_thread
end

Class Method Details

.for(*a, &b) ⇒ Object 



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# File 'lib/bj/runner.rb', line 4

def self.for(*a, &b) new(*a, &b) end

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/bj/runner.rb', line 15

def inspect
  {
    "command" => command,
    "pid" => pid,
  }.inspect
end

#new_thread ⇒ Object 



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# File 'lib/bj/runner.rb', line 22

def new_thread 
  this = self
  Thread.new do
    Thread.current.abort_on_exception = true
    loop do
      cleanup = lambda{}

      IO.popen command, "r+" do |pipe|
        this.pid = pid = pipe.pid
        cleanup = lambda do
          cleanup = lambda{}
          begin; Process.kill('SIGTERM', pid); rescue Exception; 42; end
        end
        at_exit &cleanup
        Process.wait
      end

      Bj.logger.error{ "#{ command } failed with #{ $?.inspect }" } unless
        [0, 42].include?($?.exitstatus)

      cleanup.call

      sleep 42
    end
  end
end