Class: ProcessMonitor

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

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.get_process_status(process_type, process_pattern) ⇒ Object 



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# File 'lib/process_monitor.rb', line 22

def self.get_process_status(process_type,process_pattern)
  pid = get_pid(process_type,process_pattern)
  `cat /proc/#{pid}/status|grep State`
end

.process_is_up?(process_type, process_pattern) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/process_monitor.rb', line 28

def self.process_is_up?(process_type,process_pattern)
  pid = get_pid(process_type,process_pattern)
  # The folder /proc/<pid>/ contains information about the process
  # The file /proc/<pid>/status gives information about the process as to if it is sleeping and so on.
  # If the folder exists it would mean the process exists.
  (pid.nil? || !File.exists?("/proc/#{pid}"))? false : true
end

Instance Method Details

#get_pid(process_type, process_pattern) ⇒ Object 



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# File 'lib/process_monitor.rb', line 3

def get_pid(process_type,process_pattern)
  # Parse the output to fetch the process id.
  process_id_reg_exp = %r{^(.*)\s*}

  process_information_lines = `pgrep #{process_type}|xargs ps`.split("\n")
  pid = nil

  process_information_lines.each do |process_line|
    # The name of the process will be verity-spider
    # This is to make sure we don't kill any other ruby process other than spider.
    if process_line =~ /#{process_pattern}/
      process_id_reg_exp.match(process_line)
      pid = $1.gsub(/\s*/, "").to_i
    end
  end
  pid
end