Class: Daemons::ApplicationGroup

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app_name, options = {}) ⇒ ApplicationGroup

Returns a new instance of ApplicationGroup.



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# File 'lib/daemons/application_group.rb', line 22

def initialize(app_name, options = {})
  @app_name = app_name
  @options = options

  if @options[:script]
    @script = File.expand_path(@options[:script])
  end

  @monitor = nil

  @multiple = @options[:multiple] || false

  @dir_mode = @options[:dir_mode] || :script
  ['dir'].each do |k|
    @options[k] = File.expand_path(@options[k]) if @options.key?(k)
  end
  @dir = @options[:dir] || ''

  @keep_pid_files = @options[:keep_pid_files] || false

  @no_pidfiles = @options[:no_pidfiles] || false

  @pid_delimiter = @options[:pid_delimiter]

  @applications = []
end

Instance Attribute Details

#app_argv ⇒ Object

Returns the value of attribute app_argv.



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# File 'lib/daemons/application_group.rb', line 14

def app_argv
  @app_argv
end

#app_name ⇒ Object (readonly)

Returns the value of attribute app_name.



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# File 'lib/daemons/application_group.rb', line 4

def app_name
  @app_name
end

#applications ⇒ Object (readonly)

Returns the value of attribute applications.



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# File 'lib/daemons/application_group.rb', line 11

def applications
  @applications
end

#controller_argv ⇒ Object

Returns the value of attribute controller_argv.



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# File 'lib/daemons/application_group.rb', line 13

def controller_argv
  @controller_argv
end

#dir ⇒ Object

Returns the value of attribute dir.



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# File 'lib/daemons/application_group.rb', line 17

def dir
  @dir
end

#dir_mode ⇒ Object

Returns the value of attribute dir_mode.



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# File 'lib/daemons/application_group.rb', line 16

def dir_mode
  @dir_mode
end

#monitor ⇒ Object (readonly)

Returns the value of attribute monitor.



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# File 'lib/daemons/application_group.rb', line 7

def monitor
  @monitor
end

#multiple ⇒ Object (readonly)

true if the application is supposed to run in multiple instances



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# File 'lib/daemons/application_group.rb', line 20

def multiple
  @multiple
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/daemons/application_group.rb', line 9

def options
  @options
end

#script ⇒ Object (readonly)

Returns the value of attribute script.



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# File 'lib/daemons/application_group.rb', line 5

def script
  @script
end

Instance Method Details

#create_monitor(an_app) ⇒ Object 



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# File 'lib/daemons/application_group.rb', line 143

def create_monitor(an_app)
  if @monitor && options[:monitor]
    @monitor.stop
    @monitor = nil
  end

  if options[:monitor]
    opt = {}
    opt[:monitor_interval] = options[:monitor_interval] if options[:monitor_interval]
    @monitor = Monitor.new(an_app, opt)
    @monitor.start(self)
  end
end

#find_applications(dir) ⇒ Object 



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# File 'lib/daemons/application_group.rb', line 61

def find_applications(dir)
  if @no_pidfiles
    return find_applications_by_app_name(app_name)
  else
    return find_applications_by_pidfiles(dir)
  end
end

#find_applications_by_app_name(app_name) ⇒ Object

TODO: identifiy the monitor process



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# File 'lib/daemons/application_group.rb', line 70

def find_applications_by_app_name(app_name)
  pids = []

  begin
    x = `ps auxw | grep -v grep | awk '{print $2, $11, $12}' | grep #{app_name}`
    if x && x.chomp!
      processes = x.split(/\n/).compact
      processes = processes.delete_if do |p|
        _pid, name, add = p.split(/\s/)
        # We want to make sure that the first part of the process name matches
        # so that app_name matches app_name_22

        app_name != name[0..(app_name.length - 1)] and not add.include?(app_name)
      end
      pids = processes.map { |p| p.split(/\s/)[0].to_i }
    end
  rescue ::Exception
  end

  pids.map do |f|
    app = Application.new(self, {}, PidMem.existing(f))
    setup_app(app)
    app
  end
end

#find_applications_by_pidfiles(dir) ⇒ Object 



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# File 'lib/daemons/application_group.rb', line 96

def find_applications_by_pidfiles(dir)
  @monitor = Monitor.find(dir, app_name + '_monitor')

  reporter = Reporter.new(options)
  pid_files = PidFile.find_files(dir, app_name, ! @keep_pid_files, @pid_delimiter) do |pid, file|
    reporter.deleted_found_pidfile(pid, file)
  end

  pid_files.map do |f|
    app = Application.new(self, {}, PidFile.existing(f))
    setup_app(app)
    app
  end
end

#new_application(add_options = {}) ⇒ Object 



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# File 'lib/daemons/application_group.rb', line 111

def new_application(add_options = {})
  if @applications.size > 0 && !@multiple
    if options[:force]
      @applications.delete_if do |a|
        unless a.running?
          a.zap
          true
        end
      end
    end

    fail RuntimeException.new('there is already one or more instance(s) of the program running') unless @applications.empty?
  end

  app = Application.new(self, add_options)

  setup_app(app)

  @applications << app

  app
end

#pidfile_dir ⇒ Object 



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# File 'lib/daemons/application_group.rb', line 57

def pidfile_dir
  PidFile.dir(@dir_mode, @dir, script)
end

#reload_all ⇒ Object 



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# File 'lib/daemons/application_group.rb', line 188

def reload_all
  @applications.each { |a| a.reload }
end

#running? ⇒ Boolean

Check whether at least one of the applications in the group is running. If yes, return true.

Returns:

  • (Boolean) 


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# File 'lib/daemons/application_group.rb', line 203

def running?
  @applications.each { |a| return true if a.running? }
  return false
end

#setup ⇒ Object

Setup the application group. Currently this functions calls find_applications which finds all running instances of the application and populates the application array.



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# File 'lib/daemons/application_group.rb', line 53

def setup
  @applications = find_applications(pidfile_dir)
end

#show_status ⇒ Object 



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# File 'lib/daemons/application_group.rb', line 198

def show_status
  @applications.each { |a| a.show_status }
end

#start_all ⇒ Object 



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# File 'lib/daemons/application_group.rb', line 157

def start_all
  @monitor.stop if @monitor
  @monitor = nil

  pids = []
  @applications.each do |a|
    pids << fork do
      a.start
    end
  end
  pids.each { |pid| Process.waitpid(pid) }
end

#stop_all(no_wait = false) ⇒ Object 



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# File 'lib/daemons/application_group.rb', line 170

def stop_all(no_wait = false)
  if @monitor
    @monitor.stop
    @monitor = nil
    setup
  end

  threads = []

  @applications.each do |a|
    threads << Thread.new do
      a.stop(no_wait)
    end
  end

  threads.each { |t| t.join }
end

#zap_all ⇒ Object 



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# File 'lib/daemons/application_group.rb', line 192

def zap_all
  @monitor.stop if @monitor

  @applications.each { |a| a.zap }
end