Class: God::Conditions::ProcessRunning

Inherits:
PollCondition show all
Defined in:
lib/god/conditions/process_running.rb

Overview

Trigger when a process is running or not running depending on attributes.

Examples

# Trigger if process IS NOT running.
on.condition(:process_running) do |c|
  c.running = false
end

# Trigger if process IS running.
on.condition(:process_running) do |c|
  c.running = true
end

# Non-Watch Tasks must specify a PID file.
on.condition(:process_running) do |c|
  c.running = false
  c.pid_file = "/var/run/mongrel.3000.pid"
end

Instance Attribute Summary collapse

Attributes inherited from PollCondition

#interval

Attributes inherited from God::Condition

#info, #notify, #phase, #transition

Attributes inherited from Behavior

#watch

Instance Method Summary collapse

Methods inherited from PollCondition

#after, #before

Methods inherited from God::Condition

#friendly_name, generate, valid?

Methods inherited from Behavior

#after_restart, #after_start, #after_stop, #before_restart, #before_start, #before_stop, #friendly_name, generate

Methods included from God::Configurable

#base_name, complain, #complain, #friendly_name, #prepare, #reset

Instance Attribute Details

#pid_file ⇒ Object

Public: The String PID file location of the process in question. Automatically populated for Watches.



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# File 'lib/god/conditions/process_running.rb', line 31

def pid_file
  @pid_file
end

#running ⇒ Object

Public: The Boolean specifying whether you want to trigger if the process is running (true) or if it is not running (false).



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# File 'lib/god/conditions/process_running.rb', line 27

def running
  @running
end

Instance Method Details

#pid ⇒ Object 



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# File 'lib/god/conditions/process_running.rb', line 33

def pid
  pid_file ? File.read(pid_file).strip.to_i : watch.pid
end

#test ⇒ Object 



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# File 'lib/god/conditions/process_running.rb', line 44

def test
  self.info = []

  pid = self.pid
  active = pid && System::Process.new(pid).exists?

  if running && active
    info.push('process is running')
    true
  elsif !running && !active
    info.push('process is not running')
    true
  else
    info.push('process is not running') if running
    false
  end
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/god/conditions/process_running.rb', line 37

def valid?
  valid = true
  valid &= complain("Attribute 'pid_file' must be specified", self) if pid_file.nil? && watch.pid_file.nil?
  valid &= complain("Attribute 'running' must be specified", self) if running.nil?
  valid
end