Class: Djinn::Base::PidFile

Inherits:
Object
  • Object
show all
Defined in:
lib/djinn/base/pid_file.rb

Overview

pid files are what bind your Djinn to the material plane

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file) ⇒ PidFile

Returns a new instance of PidFile.



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# File 'lib/djinn/base/pid_file.rb', line 8

def initialize(file)
  @file = file 
end

Instance Attribute Details

#file ⇒ Object (readonly)

Returns the value of attribute file.



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# File 'lib/djinn/base/pid_file.rb', line 6

def file
  @file
end

Instance Method Details

#create ⇒ Object 



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# File 'lib/djinn/base/pid_file.rb', line 20

def create
  File.open(@file, "w") { |f| f.write($$) }
end

#ensure_empty ⇒ Object 



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# File 'lib/djinn/base/pid_file.rb', line 24

def ensure_empty
  _pid = self.pid
  if _pid
    $stdout.puts <<-MSG
It looks like this Djinn is already running, not starting.
Alternatively, you could just have an orphaned pid file,
try running this command to check:

    ps aux | grep #{_pid}
      MSG
    exit 1
  end
end

#pid ⇒ Object 



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# File 'lib/djinn/base/pid_file.rb', line 12

def pid
  File.exists?(@file) and IO.read(@file).to_i
end

#remove ⇒ Object 



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# File 'lib/djinn/base/pid_file.rb', line 16

def remove
  File.unlink(@file) if pid
end